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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------

                           SCHEDULE 14C INFORMATION

        INFORMATION STATEMENT PURSUANT TO SECTION 14(c) OF THE SECURITIES
                      EXCHANGE ACT OF 1934 (AMENDMENT NO. )

Check the appropriate box:
[ ]    Preliminary Information Statement
[ ]    CONFIDENTIAL, FOR USE OF COMMISSION ONLY (AS PERMITTED BY RULE
       14c-5(d)(2))
[X]    Definitive Information Statement

                              PENNACO ENERGY, INC.
                ------------------------------------------------
                (Name of Registrant as Specified in its Charter)


Payment of Filing Fee (Check the appropriate box):
[ ]    No fee required.
[X]    Fee computed on table below per Exchange Act Rules 14c-5(g) and 0-11.

     (1)  Title of each class of securities to which transaction applies:
          Common Stock, par value $.001 per share (including the associated
          common share purchase rights), of Pennaco Energy, Inc. ("Common
          Stock")

     (2)  Aggregate number of securities to which transaction applies:
          2,758,468(a)

     (3)  Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
          filing fee is calculated and state how it was determined):
          $19.00

     (4)  Proposed maximum aggregate value of transaction:
          $52,410,892(a)

     (5)  Total fee paid:
          $10,482(a)

          (a)  As of February 23, 2001, there were 2,758,468 shares of Common
               Stock outstanding and owned by Pennaco stockholders other than
               Marathon Oil Acquisition 1, Ltd. In the merger described in the
               accompanying information statement, each share of Common Stock
               not held by Marathon Oil Acquisition 1 will (subject to appraisal
               rights) be converted into the right to receive $19.00 in cash.
               The total fee paid equals one-fiftieth of one percent of the
               aggregate cash payment in the merger to Pennaco stockholders
               other than Marathon Oil Acquisition 1. Such fee is offset in its
               entirety as set forth below.

[ ]  Fee paid previously with preliminary materials.

[X]  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.

     (1)  Amount Previously Paid:
          $85,203

     (2)  Form, Schedule or Registration Statement No.:
          Schedule TO

     (3)  Filing Party:
          Marathon Oil Acquisition 1, Ltd., Marathon Oil Company
          and USX Corporation

     (4)  Date Filed:
          January 8, 2001

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                              PENNACO ENERGY, INC.
                          1400 16TH STREET, SUITE 510
                             DENVER, COLORADO 80202


                                                               February 26, 2001


Dear Stockholder:

     You are cordially invited to attend a special meeting of stockholders of
Pennaco Energy, Inc., which will be held in the Conference Center at the offices
of Marathon Oil Company, 5555 San Felipe, Houston, Texas 77056, on March 26,
2001, at 8:00 a.m., Houston time.

     As described in the enclosed Information Statement, at the special meeting
we will ask you to vote on the adoption of the Agreement and Plan of Merger,
dated as of December 22, 2000, as amended as of February 2, 2001, by and among
Pennaco, Marathon Oil Company and Marathon Oil Acquisition 1, Ltd., a subsidiary
of Marathon Oil Company. In the merger provided for therein, each share of
common stock, other than shares held by Marathon and its subsidiaries or by any
stockholder who perfects his or her appraisal rights under Delaware law, will be
converted into the right to receive $19.00 in cash, without interest, on the
surrender of certificates formerly representing those shares. After completion
of the merger, Pennaco will be a wholly owned subsidiary of Marathon.

     The merger is the second and final step in the acquisition of Pennaco by
Marathon. The first step was a tender offer by Marathon Oil Acquisition 1 for
all of the outstanding shares of Pennaco's common stock at a price of $19.00 per
share. Marathon Oil Acquisition 1 purchased 17,331,215 shares in the tender
offer and now owns 86.3% of the outstanding shares.

     The affirmative vote of holders of a majority of the shares of Pennaco's
common stock outstanding and entitled to vote at the special meeting is
necessary to adopt the merger agreement. Marathon Oil Acquisition 1 owns a
sufficient number of shares to assure adoption of the merger agreement at the
special meeting and will vote all its shares in favor of adoption. As a result,
the affirmative vote of no other stockholder will be required to effect the
merger. Accordingly, Pennaco has determined not to solicit proxies from its
stockholders.

     Pennaco's Board of Directors has determined that the terms of the merger
are fair to and in the best interests of Pennaco and its stockholders. The Board
of Directors has unanimously recommended that Pennaco stockholders vote "for"
adoption of the merger agreement.

     Among the factors considered by the Board of Directors in evaluating the
merger was the opinion dated December 22, 2000 of Lehman Brothers Inc.,
Pennaco's financial advisor, to the effect that, as of the date of such opinion
and based on and subject to certain matters stated in that opinion, the $19.00
cash consideration to be received in the tender offer and the merger by the
stockholders of Pennaco was fair, from a financial point of view, to such
holders. A copy of that opinion is attached as Appendix A to the enclosed
Information Statement and should be read carefully in its entirety for the
assumptions made, matters considered and limitations in the review undertaken by
Lehman Brothers Inc. in rendering its opinion.

     Whether or not you plan to attend the special meeting, please read the
attached Information Statement carefully. WE ARE NOT ASKING YOU FOR A PROXY AND
YOU ARE REQUESTED NOT TO SEND US A PROXY.

     Please do not send any certificates for your stock at this time. You will
receive instructions regarding the surrender of your stock certificates and
receipt of payment for your shares after the merger is effective.

                                            Sincerely,

                                            /s/ STEVEN B. HINCHMAN

                                            Steven B. Hinchman
                                            President


This Information Statement is first being mailed to stockholders on or about
February 26, 2001.

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                              PENNACO ENERGY, INC.
                          1400 16TH STREET, SUITE 510
                             DENVER, COLORADO 80202
                                 (303) 629-7000

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                           TO BE HELD MARCH 26, 2001

To the Stockholders of
Pennaco Energy, Inc.:

     Notice is hereby given that a Special Meeting of the Stockholders of
Pennaco Energy, Inc., a Delaware corporation, will be held in the Conference
Center at the offices of Marathon Oil Company, 5555 San Felipe, Houston, Texas
77056, on March 26, 2001, at 8:00 a.m., Houston time, for the following
purposes:

     - To consider and vote on a proposal to adopt the Agreement and Plan of
       Merger, dated as of December 22, 2000, as amended as of February 2, 2001,
       by and among Pennaco Energy, Inc., Marathon Oil Company and Marathon Oil
       Acquisition 1, Ltd., a wholly owned subsidiary of Marathon, pursuant to
       which Marathon Oil Acquisition 1 will be merged with and into Pennaco,
       with Pennaco surviving as a wholly owned subsidiary of Marathon. Each
       share of Pennaco common stock outstanding, other than shares held by
       Marathon or any of its subsidiaries or by any stockholder who perfects
       his or her appraisal rights under Delaware law, will be converted into
       the right to receive $19.00 in cash, without interest. The merger
       agreement is more fully described in the accompanying Information
       Statement, and a copy of the merger agreement is attached to the
       Information Statement as Appendix B.

     - To transact such other business as may properly come before the meeting
       or any adjournment or postponement thereof.

     Only stockholders of record at the close of business on February 23, 2001
are entitled to notice of and to vote at the special meeting or any adjournment
or postponement thereof. A list of those stockholders will be available for
examination for proper purposes during ordinary business hours at the offices of
Pennaco at 1400 16th Street, Suite 510, Denver, Colorado 80202, for the 10-day
period before the special meeting.

     The affirmative vote of holders of a majority of the shares of Pennaco's
common stock outstanding and entitled to vote at the special meeting is
necessary to adopt the merger agreement. Marathon Oil Acquisition 1 owns a
sufficient number of shares to assure such adoption at the special meeting and
will vote all its shares in favor of the proposal. As a result, the affirmative
vote of no other stockholder will be required to adopt the merger agreement.
Accordingly, Pennaco has determined not to solicit proxies from its
stockholders. WE ARE NOT ASKING YOU FOR A PROXY AND YOU ARE REQUESTED NOT TO
SEND US A PROXY.

     An Information Statement containing a detailed description of the matters
to be considered at the special meeting accompanies this notice.

                                            By order of the Board of Directors,

                                            /s/ JOHN A. EVANS
                                            John A. Evans
                                            Secretary

Denver, Colorado

February 26, 2001

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                               SUMMARY TERM SHEET

     The following summarizes the most material terms of our merger with
Marathon Oil Acquisition 1, Ltd., but does not contain all information that may
be important to consider when evaluating the merits of the merger agreement and
the merger. We encourage you to read this Information Statement and the
documents we have incorporated by reference in their entirety. The actual terms
and conditions of the merger are contained in the merger agreement, which we
have attached to this Information Statement as Appendix B.

     - At the special meeting, we will ask you to vote on the adoption of the
       Agreement and Plan of Merger, dated as of December 22, 2000, as amended
       as of February 2, 2001, by and among Pennaco, Marathon Oil Company and
       Marathon Oil Acquisition 1, Ltd., a subsidiary of Marathon Oil Company.
       In the merger, each share of common stock, other than shares held by
       Marathon and its subsidiaries or by any stockholder who perfects his or
       her appraisal rights under Delaware law, will be converted into the right
       to receive $19.00 in cash, without interest.

     - The special meeting to vote on the adoption of the merger agreement will
       be held in the Conference Center at the offices of Marathon Oil Company,
       5555 San Felipe, Houston, Texas 77056, on March 26, 2001, at 8:00 a.m.,
       Houston time.


     - The merger is the second and final step in the acquisition of Pennaco by
       Marathon. The first step was a tender offer by Marathon Oil Acquisition 1
       for all of the outstanding shares of Pennaco's common stock at a price of
       $19.00 per share. Marathon Oil Acquisition 1 purchased 17,331,215 shares
       in the tender offer and now owns 86.3% of the outstanding shares. Please
       read "The Merger -- Change of Control" on page 16.


     - Marathon Oil Acquisition 1 owns a sufficient number of shares to assure
       adoption of the merger agreement at the special meeting and will vote all
       its shares in favor of the proposal. As a result, the affirmative vote of
       no other stockholder will be required to effect the merger. WE ARE NOT
       ASKING YOU FOR A PROXY AND YOU ARE REQUESTED NOT TO SEND US A PROXY.
       Please read "Information Concerning the Special Meeting -- Required Vote;
       Effect of Abstentions and Non-Votes" on page 1.

     - On December 22, 2000, the Board of Directors (all of whom were
       unaffiliated with Marathon on that date) unanimously approved and
       declared the advisability of the merger agreement and the merger and
       recommended that you vote to adopt the merger agreement. Please read "The
       Merger -- Recommendation and Reasons of the Board of Directors" beginning
       on page 5.

     - The Board of Directors received the opinion dated December 22, 2000 of
       Lehman Brothers Inc., Pennaco's financial advisor, to the effect that, as
       of the date of such opinion and based on and subject to certain matters
       stated in that opinion, the $19.00 cash consideration to be received in
       the tender offer and the merger by the stockholders of Pennaco was fair,
       from a financial point of view, to such holders. Please read "The
       Merger -- Opinion of Financial Advisor" beginning on page 6.


     - Delaware law entitles stockholders who do not vote in favor of the
       merger, and who fulfill other procedural requirements, to a judicial
       appraisal of the fair value of their shares. Please read "Appraisal
       Rights" beginning on page 20.



     - Your receipt of cash in the merger generally will be a taxable
       transaction to you. Please read "The Merger -- Federal Income Tax
       Consequences of the Merger" beginning on page 16.



     - Marathon estimates that funds totaling approximately $52.5 million will
       be required to purchase all the outstanding shares in the merger and to
       pay all the costs and expenses related to the merger. Marathon plans to
       obtain all funds needed for the merger through available cash or capital
       contributions or intercompany loans of available cash from its parent,
       USX Corporation. Marathon has no alternative financing plan to fund the
       payment for shares in the merger. Please read "The Merger -- Financing of
       the Merger" on page 17.


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                               TABLE OF CONTENTS



                                                            
INFORMATION CONCERNING THE SPECIAL MEETING..................     1
  Time, Place, Date.........................................     1
  Purpose of the Special Meeting............................     1
  Record Date; Voting at the Meeting; Quorum................     1
  Required Vote; Effect of Abstentions and Non-Votes........     1
THE PARTIES.................................................     2
  Pennaco Energy, Inc. .....................................     2
  Marathon Oil Acquisition 1, Ltd...........................     2
  Marathon Oil Company......................................     2
  USX Corporation...........................................     2
THE MERGER..................................................     3
  Background of the Offer and the Merger....................     3
  Recommendation and Reasons of the Board of Directors......     5
  Opinion of Financial Advisor..............................     6
  Marathon's Reason for the Merger..........................    13
  Merger Agreement..........................................    13
  Change of Control.........................................    16
  Rights Agreement..........................................    16
  Federal Income Tax Consequences of the Merger.............    16
  Financing of the Merger...................................    17
  Regulatory Requirements...................................    17
  Interests of Certain Persons in the Merger................    17
  Litigation Matters........................................    19
APPRAISAL RIGHTS............................................    20
SECURITIES OWNERSHIP........................................    23
WHERE YOU CAN FIND MORE INFORMATION.........................    24
APPENDIX A  OPINION OF LEHMAN BROTHERS INC.
APPENDIX B  AGREEMENT AND PLAN OF MERGER
APPENDIX C  SECTION 262 OF THE GENERAL CORPORATION LAW OF
            THE STATE OF DELAWARE



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                   INFORMATION CONCERNING THE SPECIAL MEETING

TIME, PLACE, DATE

     This Information Statement is furnished to stockholders of Pennaco in
connection with the special meeting to be held on March 26, 2001 at the time and
place specified in the attached Notice of Special Meeting, or at any
adjournments or postponements thereof.

PURPOSE OF THE SPECIAL MEETING

     At the special meeting, the stockholders of Pennaco will be asked to
consider and vote on the adoption of the Agreement and Plan of Merger, dated as
of December 22, 2000, as amended as of February 2, 2001, among Pennaco, Marathon
Oil Company and Marathon Oil Acquisition 1, Ltd., a wholly owned subsidiary of
Marathon, pursuant to which Marathon Oil Acquisition 1 will be merged with and
into Pennaco, with Pennaco as the surviving corporation. The merger agreement is
attached as Appendix B to this Information Statement. Stockholders will also be
asked to consider such other business as may properly come before the meeting.

RECORD DATE; VOTING AT THE MEETING; QUORUM


     The Board of Directors of Pennaco has fixed the close of business on
February 23, 2001 as the record date for the determination of the Pennaco
stockholders entitled to receive notice of and to vote at the special meeting.
As of the close of business on the record date, Pennaco had outstanding
20,089,683 shares of common stock held of record by approximately 50 registered
holders. Each outstanding share of common stock is entitled to one vote on all
matters coming before the special meeting. The presence, either in person or by
proxy, of the holders of a majority of the issued and outstanding shares of
common stock entitled to vote at the special meeting is necessary to constitute
a quorum for the transaction of business at the meeting.


REQUIRED VOTE; EFFECT OF ABSTENTIONS AND NON-VOTES

     Under Delaware law, the merger agreement must be adopted by the affirmative
vote of the holders of a majority of the outstanding shares of Pennaco common
stock. Marathon Oil Acquisition 1 owns 17,331,215 shares of Pennaco's common
stock, representing 86.3% of the outstanding shares, and will vote those shares
in favor of the adoption of the merger agreement. Accordingly, the Delaware law
requirement will be satisfied without the affirmative vote of any other
stockholder. WE ARE NOT ASKING YOU FOR A PROXY AND YOU ARE REQUESTED NOT TO SEND
US A PROXY. IF YOU WISH TO VOTE YOUR SHARES, YOU MAY DO SO ONLY BY ATTENDING THE
SPECIAL MEETING AND VOTING IN PERSON.

     The inspectors of election will treat shares of Pennaco common stock that
reflect abstentions as shares that are present and entitled to vote for purposes
of determining the presence of a quorum at the special meeting. The inspectors
of election will treat "broker non-votes" (i.e., shares held by brokers that are
represented at a meeting but with respect to which the broker does not have
discretionary authority to vote) as shares that are present and entitled to vote
for purposes of establishing a quorum. Since, under Delaware law, the merger
agreement must be adopted by affirmative vote of a majority of the outstanding
shares of Pennaco common stock, abstentions and broker non-votes will have the
same effect as votes against adoption.

     IF THE MERGER IS CONSUMMATED, HOLDERS OF PENNACO COMMON STOCK WILL BE SENT
INSTRUCTIONS REGARDING THE SURRENDER OF THEIR CERTIFICATES REPRESENTING SHARES
OF COMMON STOCK. HOLDERS SHOULD NOT SEND THEIR STOCK CERTIFICATES UNTIL THEY
RECEIVE THOSE INSTRUCTIONS.

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                                  THE PARTIES

PENNACO ENERGY, INC.

     Pennaco Energy, Inc. is focused on the acquisition, exploration,
development and production of natural gas from coal bed methane properties
located in the Powder River Basin in northeastern Wyoming and southeastern
Montana. Pennaco is a Delaware corporation with its executive offices at 1400
16th Street, Suite 510, Denver, Colorado 80202, and its telephone number is
(303) 629-7000. Marathon Oil Acquisition 1, Ltd. owns 86.3% of the outstanding
shares of Pennaco's common stock.

MARATHON OIL ACQUISITION 1, LTD.

     Marathon Oil Acquisition 1, Ltd., a Delaware corporation and a wholly owned
subsidiary of Marathon Oil Company, was organized to acquire Pennaco and has not
conducted any unrelated activities since its organization. The principal office
of Marathon Oil Acquisition 1 is located at the principal office of Marathon.
All outstanding shares of capital stock of Marathon Oil Acquisition 1 are owned
by Marathon.

MARATHON OIL COMPANY

     Marathon is an Ohio corporation with its principal offices located at 5555
San Felipe, Houston, Texas 77056, and its telephone number is (713) 629-6600.
Marathon is engaged in the worldwide exploration and production of crude oil and
natural gas and, through Marathon Ashland Petroleum LLC (which is 62% owned by
Marathon), refines, markets and transports petroleum products in the United
States. Marathon is a wholly owned subsidiary of USX Corporation.

USX CORPORATION

     USX is a Delaware corporation with its principal offices located at 600
Grant Street, Pittsburgh, Pennsylvania 15219-4776, and its telephone number is
(412) 433-1121. USX is a diversified company principally engaged in the energy
business through its Marathon Group and in the steel business through its U.S.
Steel Group.

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                                   THE MERGER

BACKGROUND OF THE OFFER AND THE MERGER

     From time to time, Pennaco has been the subject of informal inquiries
regarding a possible acquisition or other business combination. On September 8,
2000, Mr. Douglas E. Brooks, Manager -- Business Development for the Rocky
Mountain Region of Marathon, contacted Mr. Paul M. Rady, Chairman of the Board,
President and Chief Executive Officer of Pennaco, to inquire about Pennaco's
interest in developing a "strategic partnership" relationship or considering
potential business combination alternatives, including a possible acquisition of
Pennaco by Marathon. In response to that inquiry and subsequent requests for
information, on September 11 and 19, 2000, members of Pennaco's senior
management provided representatives of Marathon with various materials
containing publicly available information about Pennaco's operations.

     On November 8, 2000, Mr. Clarence P. Cazalot, President of Marathon,
contacted Mr. Rady to express Marathon's interest in acquiring Pennaco and to
explore potential business combination options. On November 10, 2000, Mr. Rady
and Mr. Glen C. Warren, Jr., Executive Vice President, Chief Financial Officer
and Director of Pennaco, met in Houston, Texas with Mr. Cazalot, Mr. Steven B.
Hinchman, Senior Vice President -- Production Operations of Marathon, and Mr.
Richard J. Murphy, Manager -- Mergers and Acquisitions of Marathon, and
discussed, among other things, a potential acquisition transaction. The parties
agreed to explore a possible transaction over the next 30 days. Pennaco agreed
at that time to provide Marathon with information concerning Pennaco's
operations pursuant to the terms of a confidentiality agreement dated as of
November 15, 2000.

     On November 16 and 17, 2000, representatives of Marathon met with members
of Pennaco's senior management team in Denver, Colorado for an initial due
diligence session. Throughout the latter half of November and the first half of
December 2000, Marathon conducted a due diligence review of Pennaco and its
operations.

     As a result of the preliminary discussions with Marathon, as well as other
informal inquiries that had been received from time to time, Pennaco determined
in late November 2000 to interview several investment banking firms in order to
retain a financial advisor that would assist Pennaco with any potential
transaction with Marathon, as well as any other inquiries that might be received
or solicited.

     On December 8, 2000, Mr. Cazalot communicated to Mr. Rady Marathon's
initial indication of interest in a transaction that would value Pennaco at
$17.00 per share. After receiving this initial indication of interest, the Board
of Directors held a special meeting on the same day to discuss a potential
transaction with Marathon. The Board was advised of Marathon's indication of
interest and the amount of its initial valuation and determined that the
valuation was not acceptable. However, the Board authorized the officers of
Pennaco to continue discussions with Marathon's representatives.

     Following this meeting, Pennaco representatives held additional discussions
and provided additional due diligence materials to Marathon's representatives.

     On December 9, 2000, Mr. Rady called Mr. Cazalot to convey the Board's
rejection of Marathon's $17.00 offer and to attempt to convince Mr. Cazalot that
Marathon should raise its bid to a price in excess of $20.00 per share. In
support of this effort to aggressively market Pennaco on behalf of its
stockholders, on December 10, 2000, Mr. Warren sent an e-mail message to Mr.
Murphy containing arguments attempting to justify a value in excess of $20.00
per share. In this e-mail message, Mr. Warren stated that Pennaco was in the
process of conducting engineering work and "would fully expect [its] total
proved, probable and possible reserves to . . . exceed 1.5 [trillion cubic
feet]" following that analysis. Mr. Warren's e-mail message also presented a net
asset valuation based on Pennaco's reserve report of June 30, 2000, which
produced a valuation range of $21.23 to $24.93 per share. Attached to the e-mail
message was a table reflecting Pennaco's internal reserves as of June 30, 2000,
which estimated proved reserves at 195 billion cubic feet of natural gas, and
probable reserves at 875 billion cubic feet of gas, for a total of 1.070
trillion cubic feet.

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     In subsequent litigation surrounding Marathon's tender offer, described in
detail below, Mr. Warren provided testimony by affidavit and by deposition
concerning this e-mail message and net asset valuation. In his testimony, Mr.
Warren explained that he had no firm basis to believe that Pennaco's reserves as
of December 2000 were materially different from those reflected in its June 30,
2000 reserve report. Mr. Warren also explained that the net asset valuation
provided with his e-mail used aggressive assumptions, failed to account for
certain tax effects and was prepared solely for purposes of bargaining with
Marathon. For its part, Marathon provided affidavit testimony that it viewed the
information provided by Mr. Warren skeptically and did not rely on it.
Marathon's own analysis of Pennaco's reserves, based on Marathon's experience,
knowledge of the area in which Pennaco had acreage, publicly available
information and information provided to Marathon during the normal course of due
diligence, projected total reserves of natural gas as of December 31, 2000 to be
1.028 trillion cubic feet, of which 220 billion cubic feet were proved reserves
and 808 billion cubic feet were probable reserves.


     On December 14, 2000, Mr. Cazalot communicated to Mr. Rady Marathon's
revised indication of interest in a transaction that would value Pennaco at
$19.00 per share. At a regularly scheduled meeting of the Board held on the same
date, the Board was advised of this revised indication of interest and of the
status of the continuing discussions with Marathon. At this meeting, the Board
authorized continued discussions with representatives of Marathon to see if
Marathon could be induced to raise its offer price above $19.00 per share. The
Board also authorized the engagement of Lehman Brothers Inc. to act as the
Board's financial advisor with respect to the proposed transaction and
authorized the appropriate officers of Pennaco to engage legal counsel.

     On December 15, 2000, following continued negotiations between senior
representatives of Marathon and Pennaco, during which Marathon refused to raise
its offer above $19.00 per share, the representatives of the parties reached a
tentative agreement as to the principal economic terms of the transaction,
subject to finalizing Marathon's due diligence, negotiation of a definitive
agreement and the approval of each party's board of directors. Pennaco directed
its counsel to prepare an initial draft of the merger agreement, which was
circulated to Marathon and its representatives on December 18, 2000. Between
December 18 and 22, 2000, representatives of Marathon conducted a further due
diligence review of Pennaco and its operations.

     Lehman Brothers conducted formal due diligence with Pennaco's senior
management in Denver, Colorado on December 18 and 19, 2000. Among other
information, Lehman Brothers was provided with Pennaco's 1999 year-end reserve
report from its third-party engineer, as well as Pennaco's internal June 30,
2000 reserve report. During its due diligence, Lehman Brothers was not provided
with the reserve prediction or aggressive net asset valuation contained in Mr.
Warren's December 10, 2000 e-mail to Mr. Murphy. After Lehman Brothers was
provided with this information during the course of litigation, a representative
of Lehman Brothers provided affidavit testimony that the information would not
have had a material impact on the equity value per share for the three cases
that Lehman Brothers eventually presented to the Board.

     On December 19, 2000, the Board held a special meeting to again discuss the
terms of the proposed transaction. Representatives of Lehman Brothers were also
present at the meeting and described the role Lehman Brothers would play in
connection with the continued discussions with Marathon, the financial analysis
Lehman Brothers would undertake and the proposed terms of the transaction.
Representatives of Pennaco's counsel were also present and described the legal
issues surrounding a proposed transaction, as well as the terms of the
transaction contained in the initial draft of the merger agreement that had been
delivered to Marathon and its legal counsel. The Board directed the appropriate
officers of Pennaco, assisted by Lehman Brothers, as well as Pennaco's counsel,
to continue negotiations with Marathon and its representatives. Following this
meeting, representatives and advisors of Pennaco and Marathon proceeded to
negotiate, in detail, the terms of the proposed transaction, including at
meetings and by conference calls held on December 20, 21 and 22, 2000.

     On December 22, 2000, the Board held a special meeting to review and
discuss with Pennaco's management and legal and financial advisors the terms of
the proposed acquisition and the applicable

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agreements. At this meeting, Lehman Brothers reviewed with the Board its
financial analysis of the consideration payable in the offer and the merger and
rendered to the Board an oral opinion (confirmed in writing) to the effect that,
as of the date of the opinion and based upon and subject to certain matters
stated in such opinion, the $19.00 per share cash consideration to be received
in the offer and the merger by Pennaco's stockholders was fair, from a financial
point of view, to such holders. Also at this meeting, Pennaco's counsel gave an
update with respect to various legal aspects of the transaction. At the
conclusion of this meeting, the Board unanimously approved the offer, the merger
and the merger agreement, determined that the offer, the merger and the merger
agreement are advisable and fair to and in the best interests of Pennaco's
stockholders, and recommended that the stockholders accept the offer and tender
their shares pursuant thereto and, if required by Delaware law, vote in favor of
the adoption of the merger agreement.


     Also on December 22, 2000, the Board of Directors of USX recommended that
Marathon should complete the acquisition of Pennaco, and the Board of Directors
of Marathon approved the merger agreement and the transactions contemplated
thereby by a unanimous written consent dated as of that date.

     The merger agreement was thereafter finalized and executed after the
closing of trading on December 22, 2000, and a joint press release announcing
the proposed offer and the merger was issued by Pennaco and Marathon.

     On December 27, 2000, Pennaco filed with the Securities and Exchange
Commission a Current Report on Form 8-K announcing that it had entered into the
merger agreement, which included as an exhibit a publicly available copy of the
merger agreement.

     On January 8, 2001, Marathon Oil Acquisition 1 commenced the offer, which
expired on February 5, 2001. In the offer, Marathon Oil Acquisition 1 accepted
for purchase and paid for, and currently owns, 17,331,215 shares of Pennaco
common stock, which represents 86.3% of the outstanding shares.

     On February 9, 2001, Gregory V. Gibson, Mr. Rady and Mr. Warren resigned
from the Board of Directors. As required by the merger agreement, the remaining
outside directors, David W. Lanza and Kurt M. Petersen, approved an increase in
the size of the Board to seven members and appointed Marathon designees Philip
G. Behrman, G. David Golder, Steven B. Hinchman, John T. Mills and Richard J.
Murphy to the Board.

RECOMMENDATION AND REASONS OF THE BOARD OF DIRECTORS


     At a meeting held on December 22, 2000, the Board of Directors (all of whom
were unaffiliated with Marathon on that date) unanimously approved the merger
agreement, the offer and the merger, determined that the merger agreement, the
offer and the merger are advisable and fair to, and in the best interests of,
Pennaco and its stockholders and voted to recommend that Pennaco's stockholders
tender their shares in the offer and, if required by Delaware law, vote in favor
of the adoption of the merger agreement. Accordingly, the Board of Directors
unanimously recommends that Pennaco stockholders vote "for" adoption of the
merger agreement.


     In making these determinations and recommendations, the Board of Directors
considered a number of factors, including, without limitation, the following:

     - the Board's knowledge of Pennaco's business, operations, prospects,
       projected financial performance and competitive position and current
       trends in the natural gas industry, including production of coal bed
       methane gas;

     - the financial and other terms and conditions of the offer and the merger
       agreement and the fact that they were the product of arm's-length
       negotiations between the parties;

     - the fact that the $19.00 per share price to be received by Pennaco's
       stockholders in the offer and the merger represents a significant premium
       over the historical trading prices for Pennaco's common stock since it
       began trading in July 1998, including a 30% premium over the closing
                                        5
   11

       market price of $14.625 per share on December 21, 2000, the last full
       trading day prior to the Board's approval of the merger agreement, and a
       40% premium over the average closing market price of $13.5375 per share
       for the 20 trading days prior to the Board's approval of the merger
       agreement;

     - the fact that the offer and the merger provide for a prompt cash tender
       offer for all of the shares to be followed by the merger for the same
       consideration, thereby enabling Pennaco's stockholders to obtain promptly
       the benefits of the transaction in exchange for their shares;

     - the financial presentation of Lehman Brothers Inc., including its opinion
       as to the fairness, from a financial point of view and as of the date of
       the opinion, of the $19.00 per share cash consideration to be received in
       the offer and the merger by Pennaco's stockholders, which opinion is more
       fully described below under "-- Opinion of Financial Advisor";

     - the fact that the offer and the merger were not expressly conditioned on
       the availability of financing, which, combined with the experience,
       reputation and financial condition of Marathon, increased the likelihood
       that the proposed offer and merger would be consummated;

     - the terms of the merger agreement, including the parties'
       representations, warranties and covenants and the conditions to their
       respective obligations;

     - the interests of Pennaco's directors and executive officers in the
       proposed transaction as described under "-- Interests of Certain Persons
       in the Merger"; and

     - the fact that Pennaco could terminate the merger agreement, prior to the
       acceptance for payment of shares in the offer, in order to approve a
       tender offer for the shares or other proposed business combination by a
       third party on terms more favorable to Pennaco's stockholders than
       Marathon's offer and the merger, upon the payment to Marathon of a $15
       million termination fee.

     The Board of Directors did not assign relative weights to the above factors
or determine that any factor was of particular importance. Rather, the Board
viewed its position and recommendations as being based on the totality of the
information presented to and considered by it. In addition, it is possible that
different members of the Board assigned different weights to the various factors
described above.

OPINION OF FINANCIAL ADVISOR

     Lehman Brothers has acted as financial advisor to Pennaco in connection
with the proposed transaction. On December 22, 2000, Lehman Brothers rendered
its opinion to the Board that as of such date, from a financial point of view,
the cash consideration of $19.00 per share to be offered by Marathon to
Pennaco's stockholders in connection with the proposed transaction was fair to
such stockholders. On the date of the Lehman Brothers opinion, neither Marathon
nor any of its subsidiaries beneficially owned any shares of Pennaco common
stock. Accordingly, the Lehman Brothers opinion addresses the fairness, from a
financial point of view, of the consideration to be received in the offer and
the merger by the Pennaco stockholders other than Marathon and its subsidiaries.

     THE FULL TEXT OF LEHMAN BROTHERS' OPINION DATED DECEMBER 22, 2000 IS
INCLUDED AS APPENDIX A TO THIS INFORMATION STATEMENT AND IS INCORPORATED HEREIN
BY REFERENCE. HOLDERS OF PENNACO'S COMMON STOCK MAY READ LEHMAN BROTHERS'
OPINION FOR A DISCUSSION OF THE PROCEDURES FOLLOWED, FACTORS CONSIDERED,
ASSUMPTIONS MADE AND QUALIFICATIONS AND LIMITATIONS OF THE REVIEW UNDERTAKEN BY
LEHMAN BROTHERS IN CONNECTION WITH ITS OPINION.

     LEHMAN BROTHERS' ADVISORY SERVICES AND OPINION WERE PROVIDED FOR THE
INFORMATION AND ASSISTANCE OF THE BOARD OF DIRECTORS IN CONNECTION WITH ITS
CONSIDERATION OF THE PROPOSED TRANSACTION. LEHMAN BROTHERS' OPINION IS NOT A
RECOMMENDATION TO ANY STOCKHOLDER OF PENNACO AS TO WHETHER TO VOTE FOR OR
AGAINST THE MERGER AGREEMENT AND THE MERGER. LEHMAN BROTHERS WAS NOT REQUESTED
TO OPINE AS TO, AND ITS OPINION DOES NOT ADDRESS, PENNACO'S UNDERLYING BUSINESS
DECISION TO PROCEED WITH OR EFFECT THE MERGER.

                                        6
   12

     In arriving at its opinion, Lehman Brothers reviewed, among other things:

     - the merger agreement and the specific terms of the proposed transaction;

     - publicly available information concerning Pennaco that Lehman Brothers
       believed to be relevant to its analysis, including Pennaco's Annual
       Report for the year ended December 31, 1999 and Pennaco's Quarterly
       Report for the period ended September 30, 2000;

     - a reserve report prepared by Pennaco as of June 30, 2000 and a
       third-party engineer reserve report as of December 31, 1999 detailing
       certain estimates of proved reserves and future production, revenue,
       operating costs and capital investment for Pennaco as of such dates;

     - a schedule prepared by Pennaco's management of Pennaco's estimated
       probable and possible reserves as of June 30, 2000;

     - financial and operating information with respect to the business,
       operations and prospects of Pennaco furnished to Lehman Brothers by
       Pennaco, including financial projections for Pennaco for the period from
       2000 through 2005;

     - a trading history of Pennaco's common stock from December 19, 1999 to
       December 19, 2000 and a comparison of that trading history with those of
       other companies that Lehman Brothers deemed relevant;

     - a comparison of the historical financial results and present financial
       condition of Pennaco with those of other companies that Lehman Brothers
       deemed relevant;

     - a comparison of the financial terms of the proposed transaction with the
       financial terms of certain other oil and gas transactions that Lehman
       Brothers deemed relevant; and

     - a review of Pennaco's current liquidity position and short-term capital
       requirements with the management of Pennaco.

     In addition, Lehman Brothers had discussions with the management of Pennaco
concerning Pennaco's business, operations, assets, financial condition,
prospects, reserves, production profile and exploration programs and undertook
such other studies, analyses and investigations that Lehman Brothers deemed
appropriate.

     In arriving at its opinion, Lehman Brothers assumed and relied upon the
accuracy and completeness of the financial and other information used by Lehman
Brothers without assuming any responsibility for independent verification of
such information and further relied upon the assurances of management of Pennaco
that they are not aware of any facts or circumstances that would make such
information inaccurate or misleading. With respect to the financial projections
of Pennaco and the estimates of future production, revenue, operating costs and
capital investment for Pennaco, each as prepared by Pennaco, upon advice of
Pennaco, Lehman Brothers assumed that such projections and estimates were
reasonably prepared on a basis reflecting the best currently available estimates
and judgments of Pennaco's management as to the future performance of Pennaco,
and that Pennaco will perform substantially in accordance with such projections
and estimates. However, for purposes of its analysis, Lehman Brothers also
considered certain somewhat more conservative assumptions which resulted in
certain adjustments to the projections and estimates of Pennaco. Lehman Brothers
discussed these adjusted projections and estimates with the management of
Pennaco and Pennaco's management agreed with the appropriateness of the use of
such adjusted projections and estimates by Lehman Brothers in performing its
analysis. In arriving at its opinion, Lehman Brothers did not conduct a physical
inspection of the properties and facilities of Pennaco and did not make or
obtain any evaluations or appraisals of the assets or liabilities of Pennaco. In
addition, the Board did not authorize Lehman Brothers to solicit, and Lehman
Brothers has not solicited, any indications of interest from any third parties
with respect to the purchase of all or a part of Pennaco's business. Lehman
Brothers' opinion necessarily was based on market, economic and other conditions
as they existed on, and could be evaluated as of, December 22, 2000.

                                        7
   13

     No limitations were imposed by Pennaco on the scope of Lehman Brothers'
investigation or the procedures to be followed by Lehman Brothers in rendering
its opinion. In connection with rendering its opinion, Lehman Brothers performed
certain financial, comparative and other analyses as described below. In
arriving at its opinion, Lehman Brothers did not ascribe a specific range of
value to Pennaco, but rather made its determination as to the fairness, from a
financial point of view, of the cash consideration of $19.00 per share to be
offered to Pennaco's stockholders in the proposed transaction on the basis of
the analysis described below. The preparation of a fairness opinion involves
various determinations as to the most appropriate and relevant methods of
financial and comparative analysis and the application of those methods to the
particular circumstances, and, therefore, such an opinion is not readily
susceptible to summary description. Furthermore, in arriving at its fairness
opinion, Lehman Brothers did not attribute any particular weight to any analysis
or factor considered by it, but rather made qualitative judgments as to the
significance and relevance of each analysis and factor. Accordingly, Lehman
Brothers believes that its analyses must be considered as a whole and that
considering any portion of such analyses and the factors considered, without
considering all analyses and factors, could create a misleading or incomplete
view of the process underlying the opinion. In its analyses, Lehman Brothers
made numerous assumptions with respect to industry performance, general business
and economic conditions and other matters, many of which are beyond the control
of Pennaco. Any estimates contained in the analyses are not necessarily
indicative of actual values or predictive of future results or values, which may
be significantly more or less favorable than as set forth in the analyses. In
addition, analyses relating to the value of businesses do not purport to be
appraisals or to reflect the prices at which businesses could actually be sold.

  Valuation Analysis

     Lehman Brothers performed a valuation of Pennaco using the following
methodologies: net asset valuation analysis, comparable companies analysis and
comparable transactions analysis. Each of these methodologies was used to
generate a reference enterprise value range for Pennaco. The enterprise value
range was adjusted for appropriate on and off balance sheet assets and
liabilities to arrive at an equity value range (in aggregate dollars). The
equity value range was divided by fully diluted shares outstanding which is
comprised of primary shares, outstanding options and outstanding warrants. The
per share equity value ranges were then compared to the $19.00 per share cash
consideration to be offered to Pennaco's stockholders in the offer and the
merger. The implied per share equity values derived using the various valuation
methodologies described above supported the conclusion that the consideration to
be received by Pennaco's stockholders was fair, from a financial point of view,
to such stockholders.

     The various valuation methodologies noted above and the implied per share
equity values derived therefrom are included in the following table. This table
should be read together with the more detailed descriptions set forth below. The
table alone does not constitute a complete description of the financial and
comparative analyses. Considering the implied per share equity values without
considering the narrative description of the financial analyses, including the
assumptions underlying these analyses, could create a misleading or incomplete
view of the process underlying, and conclusions represented by, Lehman Brothers'
opinion.



                                                                                       IMPLIED EQUITY
VALUATION METHODOLOGY                  SUMMARY DESCRIPTION OF VALUATION METHODOLOGY    VALUE PER SHARE
- ---------------------                  --------------------------------------------    ---------------
                                                                                 
NET ASSET VALUATION ANALYSIS.........  Net present valuation of after-tax cash
                                       flows generated by proved reserves using
                                       selected hydrocarbon pricing scenarios and
                                       discount rates plus evaluation of probable
                                       reserves and other assets and liabilities
                                       -- Case I Gas Prices                             $ 6.27-$ 8.31
                                       -- Case II Gas Prices                            $12.14-$15.24
                                       -- Case III Gas Prices                           $15.14-$18.89


                                        8
   14



                                                                                       IMPLIED EQUITY
VALUATION METHODOLOGY                  SUMMARY DESCRIPTION OF VALUATION METHODOLOGY    VALUE PER SHARE
- ---------------------                  --------------------------------------------    ---------------
                                                                                 
COMPARABLE COMPANIES ANALYSIS........  Market valuation benchmark based on the
                                       common stock trading multiples of selected
                                       comparable companies for selected financial
                                       and asset-based measures excluding
                                       incorporation of a control premium               $13.21-$17.44
                                       Comparable companies valuation analysis
                                       incorporating a 15% control premium              $15.19-$20.06
COMPARABLE TRANSACTIONS ANALYSIS.....  Market valuation benchmark based on
                                       consideration paid in selected comparable
                                       transactions                                     $ 8.98-$11.10
CONSIDERATION TO BE RECEIVED BY
  PENNACO'S STOCKHOLDERS IN THE OFFER
  AND THE MERGER.....................                                                          $19.00


     Net Asset Valuation Analysis.  Lehman Brothers estimated the present value
of the future after-tax cash flows expected to be generated from Pennaco's
proved reserves as of January 1, 2001 based on estimated reserves, production
cost estimates and a range of discount rates and assuming a tax rate of 38%, all
as provided by Pennaco's management and discussed with Pennaco's management.
Lehman Brothers added to such estimated values for proved reserves assessments
of the value of certain other assets and liabilities of Pennaco, including
probable and possible reserves and other land and acreage. Identified probable
and possible reserves were assessed based on the results of the evaluation of
proved undeveloped reserves with certain additional adjustments to reflect the
risk profile of the probable and possible reserves. Additional land and acreage
were assessed using a range of multiples as determined by Lehman Brothers
through discussions with Pennaco's management. The net asset valuation analysis
was performed under three natural gas price scenarios (Case I, Case II and Case
III), which are described below.

     The natural gas price forecasts employed by Lehman Brothers were based on
New York Mercantile Exchange ("NYMEX") price forecasts (Henry Hub, Louisiana
delivery) from which adjustments were made to reflect location and quality
differentials. NYMEX gas price quotations are stated in heating value
equivalents per million British Thermal Units ("MMBtu"), which are adjusted to
reflect the value per thousand cubic feet ("MCF") of gas. The table below
presents a summary of natural gas price forecasts employed by Lehman Brothers
for each pricing case.



                                                                    ESCALATION   PRICE      COST
HENRY HUB ($/MMBTU)                         2001E   2002E   2003E   THEREAFTER    CAP    ESCALATION
- -------------------                         -----   -----   -----   ----------   -----   ----------
                                                                       
Case I....................................  $3.00   $2.90   $2.80       --         N.A       --
Case II...................................  $5.00   $4.15   $3.50       --         N.A       --
Case III..................................  $6.07   $4.37   $3.86      1.5%      $5.00      1.5%


     Case I reflects an estimate developed by Lehman Brothers, in consultation
with Pennaco, of future natural gas prices which commercial banks and other
lenders might have considered, as of December 19, 2000, in determining borrowing
bases for exploration and production companies. Case II reflects the published
natural gas price forecasts employed as of December 19, 2000 by Lehman Brothers'
equity research department in developing earnings and cash flow estimates for
exploration and production companies for which they publish research. Case III
reflects, for each of the three years shown, forward-market prices as of
December 19, 2000 for natural gas. These prices were determined by averaging the
12 monthly NYMEX natural gas futures contracts for each of the three years. In
each of the price cases, adjustments are made to account for heating content of
the gas and costs related to gathering, processing and transportation.

                                        9
   15

     The net asset valuation analysis resulted in implied per share equity
values of $6.27 to $8.31 for Case I; $12.14 to $15.24 for Case II; and $15.14 to
$18.89 for Case III. The consideration of $19.00 per share offered to Pennaco's
stockholders in the offer and the merger exceeds the high end of this overall
valuation range.

     Comparable Companies Analysis.  Lehman Brothers reviewed the public stock
market trading multiples for selected exploration and production companies
including:

     - Barrett Resources Corporation

     - Burlington Resources Inc.

     - Cross Timbers Oil Company

     - EOG Resources, Inc.

     - Evergreen Resources, Inc.

     - HS Resources, Inc.

     - Louis Dreyfus Natural Gas Corp.

     - Prima Energy Corporation

     - Tom Brown, Inc.

     Using publicly available information, Lehman Brothers calculated and
analyzed the adjusted capitalization multiples of certain historical and
projected financial and operating criteria such as earnings before interest,
taxes, depreciation, depletion, amortization and exploration expenses
("EBITDE"), proved reserves, net income and discretionary cash flow. The
adjusted capitalization of each company was obtained by adding its long-term
debt to the sum of the market value of the common equity, the value of its
preferred stock and the book value of any minority interest, minus cash balance.
The appropriate projected 2000, 2001 and 2002 EBITDE multiple ranges were
determined to be 6.0x to 7.0x, 4.5x to 5.5x, and 4.0x to 5.0x, respectively.
Proved reserve multiple ranges were determined to be $1.50 to $1.70 per thousand
cubic feet of gas equivalent ("Mcfe"); the multiples were applied to Pennaco's
management's internal reserve estimates as of July 1, 2000. The appropriate
projected 2000, 2001 and 2002 net income multiple ranges were determined to be
15.0x to 18.0x, 10.0x to 12.0x, and 9.0x to 11.0x, respectively. The appropriate
projected 2000, 2001 and 2002 discretionary cash flow multiple ranges were
determined to be 5.5x to 6.5x, 4.0x to 5.0x, and 3.5x to 4.5x, respectively.

     This methodology yielded valuations for Pennaco that implied a per share
equity value range of $13.21 to $17.44. Additionally, a control premium was
applied to reflect potential additional per share value of owning a majority
interest in the equity of Pennaco. This control premium was estimated to be 15%.
This methodology yielded valuations for Pennaco that implied a per share equity
value range of $15.19 to $20.06. The cash consideration of $19.00 per share
offered to Pennaco's stockholders in the offer and the merger falls within this
range.

     Because of the inherent differences between the corporate structure,
businesses, operations and prospects of Pennaco and the corporate structure,
businesses, operations and prospects of the companies included in the comparable
company groups, Lehman Brothers believed that it was inappropriate to, and
therefore did not, rely solely on the quantitative results of the analysis and,
accordingly, also made qualitative judgments concerning differences between the
financial and operating characteristics of Pennaco and the companies in the
comparable company group that would affect the public trading values of Pennaco
and such comparable companies.

                                       10
   16

     Comparable Transactions Analysis.  Lehman Brothers reviewed certain
publicly available information on selected transactions which were announced or
took place from May 1998 to November 2000, including, but not limited to:

     - Calpine Corporation/TriGas Exploration Inc.

     - Apache Corporation/Fletcher Challenge Ltd.

     - Apache Corporation/Phillips Petroleum Company

     - Tom Brown, Inc./Stellarton Energy Corporation

     - Pogo Producing Company/North Central Oil Corp.

     - Stone Energy Corporation/Basin Exploration, Inc.

     - The Meridian Resource Corporation/Shell Oil Company

     - Forest Oil Corporation/Forcenergy Inc.

     - Chesapeake Energy Corporation/Gothic Energy Corporation

     - Devon Energy Corporation/Santa Fe Snyder Corporation

     - BP Amoco Corporation/Vastar Resources, Inc.

     - AEC Oil & Gas/McMurry Oil Company

     - Louis Dreyfus Natural Gas Corp./Costilla Energy, Inc.

     - Anadarko Petroleum Corporation/Union Pacific Resources Group Inc.

     - Prize Energy Corp./Vista Energy Resources, Inc.

     - St. Mary Land & Exploration Company/King Ranch Energy

     - Devon Energy Corporation/PennzEnergy Company

     - Cross Timbers Oil Company/Spring Holding Co.

     - Santa Fe Energy Resources, Inc./Snyder Oil Corporation

     - Ocean Energy, Inc./Seagull Energy Corporation

     - Kerr-McGee Corporation/Oryx Energy Company

     - Pogo Producing Company/Arch Petroleum, Inc.

     - Lomak Petroleum, Inc./Domain Energy Corporation

     - Atlantic Richfield Company/Union Texas Petroleum Holdings, Inc.

     For each transaction, relevant transaction multiples were analyzed
including: total purchase price (equity purchase price plus assumed obligations)
divided by latest twelve month ("LTM") EBITDE; total purchase price divided by
proved oil and natural gas reserves on an Mcfe basis; total purchase price
divided by estimated current net production; and equity purchase price divided
by the LTM discretionary cash flow. The appropriate LTM EBITDE multiple range
was determined to be 7.5x to 8.5x. The appropriate proved reserve multiple range
was determined to be $1.40 to $2.00 per Mcfe. The appropriate net daily
production multiple range was determined to be $4.75 to $5.25 per MMcf/d. The
appropriate LTM discretionary cash flow multiple range was determined to be 7.0x
and 8.0x.

     This methodology yielded valuations for Pennaco that implied per share
equity values ranging from $8.98 to $11.10. The consideration of $19.00 per
share offered to Pennaco's stockholders in the offer and the merger exceeds the
high end of this valuation range.

                                       11
   17

     Because the market conditions, rationale and circumstances surrounding each
of the transactions analyzed were specific to each transaction and because of
the inherent differences between the businesses, operations and prospects of
Pennaco and the acquired businesses analyzed, Lehman Brothers believed that it
was inappropriate to, and therefore did not, rely solely on the quantitative
results of the analysis and, accordingly, also made qualitative judgments
concerning differences between the characteristics of each of these transactions
and the transactions contemplated by the merger agreement involving Pennaco.

  E&P Transaction Premiums Analysis

     Lehman Brothers reviewed certain publicly available information related to
selected exploration and production corporate transactions to calculate the
amount of the premiums paid by the acquirers to the acquired company's
stockholders. Transactions analyzed included, but were not limited to:

     - Tom Brown, Inc./Stellarton Energy Corporation

     - Amerada Hess/Lasmo

     - Stone Energy Corporation/Basin Exploration, Inc.

     - Devon Energy Corporation/Santa Fe Snyder Corporation

     - Anadarko Petroleum Corporation/Union Pacific Resources Group Inc.

     - Devon Energy Corporation/Pennzenergy Company

     - Santa Fe Energy Resources, Inc./Snyder Oil Corporation

     - Ocean Energy, Inc./Seagull Energy Corporation

     - Kerr-McGee Corporation/Oryx Energy Company

     - Pogo Producing Company/Arch Petroleum, Inc.

     - Atlantic Richfield Company/Union Texas Petroleum Holdings, Inc.

     - Ocean Energy, Inc./United Meridian Corporation

     - Chesapeake Energy Corporation/Hugoton Energy Corporation

     - Pioneer Natural Resources Company/Chauvco Resources, Ltd.

     - Texaco Inc./Monterey Resources, Inc.

     - Burlington Resources Inc./Louisiana Land & Exploration Company

     - Louis Dreyfus Natural Gas Corp./American Exploration Company

     - Parker & Parsley Petroleum Company/Mesa Inc.

     Lehman Brothers calculated the premiums paid by the acquirer by comparing
the per share purchase price in each transaction to the historical stock price
of the acquired company as of one day, one week and one month prior to the
announcement date. Lehman Brothers compared the premiums paid in the precedent
transactions to the premium levels implied by the $19.00 cash consideration
offered to Pennaco's stockholders in the offer and the merger. The table below
sets forth the summary results of the analysis:



                                                               PERCENTAGE PREMIUM TO THE
                                                              PRICE AS OF DAY(S) PRIOR TO
                                                               TRANSACTION ANNOUNCEMENT
                                                              ---------------------------
SELECTED TRANSACTIONS                                         1-DAY    1-WEEK    4-WEEKS
- ---------------------                                         ------   -------   --------
                                                                        
Mean........................................................   16.3%    19.3%      24.5%
Median......................................................   14.9%    17.6%      22.3%
PREMIUM TO BE RECEIVED BY PENNACO'S STOCKHOLDERS IN THE
  OFFER AND THE MERGER (PREMIUMS CALCULATED AS OF DECEMBER
  19, 2000).................................................   24.6%    34.5%      50.5%


                                       12
   18

     Additionally, Lehman Brothers advised the Board of Directors that the
$19.00 offer was a premium of 9.4% to Pennaco's all-time closing high and 7.0%
to Pennaco's all-time intra-day high.

     Lehman Brothers is an internationally recognized investment banking firm
engaged in, among other things, the valuation of businesses and their securities
in connection with mergers and acquisitions, negotiated underwritings,
competitive bids, secondary distributions of listed and unlisted securities,
private placements and valuations for corporate and other purposes. Pennaco
selected Lehman Brothers because of its expertise, reputation and familiarity
with Pennaco and because its investment banking professionals have substantial
experience in transactions comparable to those which are contemplated by the
merger agreement involving Pennaco.

     Lehman Brothers has acted as financial advisor to Pennaco in connection
with the transactions contemplated by the merger agreement and will receive a
fee for its services which is contingent upon the consummation of the proposed
transaction. In addition, Pennaco has agreed to indemnify Lehman Brothers for
certain liabilities that may arise out of the rendering of its engagement,
including certain liabilities under the federal securities laws.

     Lehman Brothers has also performed various investment banking services for
Marathon and USX in the past and has received customary fees for those services.
In the ordinary course of its business, Lehman Brothers actively trades in the
securities of Pennaco and USX for its own account and for the accounts of its
customers and, accordingly, may at any time hold a long or short position in
those securities.

MARATHON'S REASON FOR THE MERGER

     Marathon's reason for engaging in the merger is to increase its ownership
of Pennaco from 83.6% to 100%. The acquisition of the shares of Pennaco common
stock was structured as a cash tender offer followed by a cash merger so as to
effect a prompt and orderly transfer of ownership of Pennaco from Pennaco's
public stockholders to Marathon and to provide those stockholders with cash for
all of their shares.

MERGER AGREEMENT

     The following is a summary of the material provisions of the merger
agreement that relate to the merger. A copy of the merger agreement is attached
as Appendix B to this Information Statement. An amendment to the merger
agreement also is attached as Appendix B. The description of the merger
agreement, as amended, contained in this section is qualified in its entirety by
reference to the full text of the merger agreement. The merger agreement, as
amended, is incorporated into this Information Statement by this reference.

  The Merger

     The merger agreement provides for the merger of Marathon Oil Acquisition 1
with and into Pennaco. Pennaco will be the surviving corporation and will become
a wholly owned subsidiary of Marathon at the effective time of the merger. In
the merger, each share of Pennaco common stock outstanding immediately prior to
the effective time (other than shares held by stockholders who perfect their
appraisal rights under Delaware law ("Dissenting Shares") and shares held in
Pennaco's treasury or owned by Marathon or its subsidiaries) will be converted
into the right to receive $19.00 in cash, without interest.

     Each share of Pennaco common stock that is held in Pennaco's treasury or
that is owned by Marathon or its subsidiaries will be canceled and retired
without payment of any consideration therefor.

     Each share of common stock of Marathon Oil Acquisition 1 outstanding
immediately prior to the effective time will be converted into and become one
share of common stock of the surviving corporation and will constitute the only
outstanding shares of capital stock of the surviving corporation.

     Stockholders who do not vote to adopt the merger agreement and who
otherwise strictly comply with the provisions of Delaware law regarding
statutory appraisal rights have the right to seek a determination

                                       13
   19

of the fair value of their shares of common stock and payment in cash therefor
in lieu of the merger consideration. See "Appraisal Rights."

     The closing of the merger will occur on the second business day on which
the last of the conditions to the merger contained in the merger agreement has
been satisfied or waived or on such other date as Marathon and Pennaco may
agree. On the closing date, the parties will cause a certificate of merger to be
filed with the Delaware Secretary of State, and the time of such filing will be
the "effective time" unless otherwise provided in the certificate of merger.

     Under the merger agreement, the certificate of incorporation and bylaws of
Pennaco will be the certificate of incorporation and bylaws of the surviving
corporation of the merger. The directors of Marathon Oil Acquisition 1 and the
officers of Pennaco immediately prior to the effective time will be the initial
directors and officers of the surviving corporation.

  Procedures for Exchange of Certificates

     Marathon will cause to be deposited with The Bank of New York, as paying
agent, on a timely basis, as and when needed after the effective time, cash
necessary to pay for the shares converted into the right to receive the merger
consideration to be paid under the merger agreement. As soon as reasonably
practicable after the effective time, the paying agent will mail a transmittal
form to former stockholders of Pennaco. The transmittal form will contain
instructions with respect to the surrender of stock certificates formerly
representing shares of Pennaco common stock to be exchanged in the merger.
STOCKHOLDERS SHOULD NOT RETURN STOCK CERTIFICATES UNTIL THEY RECEIVE THE
TRANSMITTAL FORM.

     Upon the surrender of each certificate by Pennaco stockholders, the holder
of such certificate will be entitled to receive, in exchange for each share of
Pennaco common stock represented by such certificate, $19.00 in cash, without
interest, subject to any required withholding tax. Any surrendered certificate
will be canceled.

     At or after the effective time, no transfers of Pennaco common stock will
be permitted on the stock transfer books of the surviving corporation. If, after
the effective time, certificates formerly representing shares of Pennaco common
stock are presented to the surviving corporation or the paying agent, such
certificates will be canceled and exchanged for cash in an amount equal to the
merger consideration deliverable under the merger agreement.

     Any portion of the exchange fund that remains undistributed to former
stockholders of Pennaco 180 days after the effective time will be delivered to
the surviving corporation. After that time, a holder of a certificate
representing Pennaco common stock may look only to the surviving corporation for
payment of the merger consideration.

     None of Marathon, Marathon Oil Acquisition 1, Pennaco, the surviving
corporation or the paying agent will be liable to any person for any payments or
distributions from the exchange fund delivered to a public official under any
applicable abandoned property, escheat or similar law.

  Composition of the Pennaco Board

     Following consummation of the offer, Gregory V. Gibson, Paul M. Rady and
Glen C. Warren, Jr. resigned from the Board of Directors. As required by the
merger agreement, the remaining outside directors, David W. Lanza and Kurt M.
Petersen, approved an increase in the size of the Board to seven members and
appointed Marathon designees Philip G. Behrman, G. David Golder, Steven B.
Hinchman, John T. Mills and Richard J. Murphy to the Board.

     The merger agreement provides that, until the effective time of the merger,
Marathon will have the right to designate a number of directors that is
proportionate to its percentage ownership of shares of Pennaco common stock. The
merger agreement also provides that, until the effective time, the Pennaco Board
will have at least two directors who are directors on the date of the merger
agreement and who are not officers of Pennaco. In addition, if the number of
independent directors is reduced below two for any

                                       14
   20

reason whatsoever, the remaining independent director will be entitled to
designate a person to fill the vacancy or, if no independent directors then
remain, the other directors will designate two persons to fill such vacancies
who are not officers, stockholders or affiliates of Pennaco, Marathon Oil
Acquisition 1 or Marathon.

     Any amendment or termination of the merger agreement by Pennaco, extension
of time for the performance, or waiver, of the obligations or other acts of
Marathon Oil Acquisition 1 or Marathon or waiver of Pennaco's rights under the
merger agreement will require the approval of all the independent directors
(and, in any event, at least two independent directors) in addition to any
required approval by the full Pennaco Board.

     Under the merger agreement, as a result of the merger, the directors of
Marathon Oil Acquisition 1 immediately prior to the effective time will become
the directors of Pennaco, as the surviving corporation.

  Conditions to the Merger

     The merger agreement provides that the obligation of each party to effect
the merger is subject to the satisfaction or waiver, on or prior to the closing
date of the merger, of the following conditions:

     - the merger agreement shall have been adopted by the stockholders of
       Pennaco;

     - no temporary restraining order, preliminary or permanent injunction or
       other order issued by any court of competent jurisdiction or other legal
       restraint or prohibition preventing the consummation of the merger shall
       be in effect; and

     - no statute, code or regulation shall have been enacted or promulgated by
       any governmental entity that prohibits consummation of the merger.

  Termination

     The merger agreement may be terminated and the merger may be abandoned at
any time prior to the effective time:

     - by mutual written consent of Marathon and Pennaco, subject to approval of
       the independent directors of the Pennaco Board of Directors; or

     - by either Marathon or Pennaco if a statute, rule or executive order has
       been enacted, entered or promulgated prohibiting the transactions
       contemplated by the merger agreement on the terms contemplated thereby or
       if any governmental entity has issued an order, decree or ruling or takes
       any other action permanently enjoining, restraining or otherwise
       prohibiting the merger and such order, decree, ruling or other action has
       become final and nonappealable.

     The merger agreement provides that, in the event of termination thereof by
either Pennaco or Marathon as described above, the merger agreement will become
void and have no effect, without any liability or obligation on the part of
Marathon, Marathon Oil Acquisition 1 or Pennaco, except that:

     - certain provisions of the merger agreement will survive such termination,
       and

     - no party will be relieved from liability for fraud or liability for the
       willful breach by a party of any representation, warranty or covenant set
       forth in the merger agreement, and such party will be fully liable for
       any and all liabilities and damages incurred or suffered by the other
       party as a result of any such breach.

  Fees and Expenses

     All fees and expenses incurred in connection with the merger and the other
transactions contemplated by the merger agreement will be paid by the party
incurring such fees or expenses, whether or not the merger is consummated.

                                       15
   21

  Amendment

     Subject to the provisions described above under "-- Composition of the
Pennaco Board" regarding approval by the independent directors, the merger
agreement may be amended, supplemented or modified by written agreement among
the parties at any time before or after adoption of the merger agreement by the
stockholders of Pennaco. After such adoption, however, no amendment, supplement
or modification may be made that by law requires further approval by the
stockholders of Pennaco without the further approval of such stockholders.

CHANGE OF CONTROL

     The offer expired at 12:00 midnight, New York City time, on Monday,
February 5, 2001. Based on information provided by The Bank of New York, as the
depositary for the offer, as of midnight, New York City time, on Monday,
February 5, 2001, 17,563,120 shares (including 956,809 shares subject to
guarantees of delivery within three trading days after the expiration date) were
validly tendered in the offer and not withdrawn. Of the shares subject to
guarantees of delivery, 231,905 shares were not delivered as guaranteed.
Accordingly, Marathon Oil Acquisition 1 accepted for purchase and paid for in
the offer, and currently owns, 17,331,215 shares, which represents 86.3% of the
outstanding shares of Pennaco common stock.

RIGHTS AGREEMENT

     Effective as of December 22, 2000, the Pennaco Board of Directors amended
the Rights Agreement dated as of February 24, 1999 between Pennaco and
Computershare Investor Services, L.L.C., as rights agent, to render the common
share purchase rights that are attached to and trade with Pennaco common stock
inapplicable to the offer, the merger and the other transactions contemplated by
the merger agreement.

FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER

     The following is a summary of material U.S. federal income tax
considerations relevant to beneficial owners whose shares of common stock are
converted to cash in the merger. This summary is based on laws, regulations,
rulings and decisions currently in effect, all of which are subject to change
possibly with retroactive effect, and is not applicable to Marathon and certain
parties related to Marathon, if any. The summary applies only to beneficial
owners who hold shares of common stock as capital assets within the meaning of
Section 1221 of the Internal Revenue Code of 1986, as amended (the "Code"), and
may not apply to certain types of beneficial owners of common stock (such as
insurance companies, tax-exempt organizations and broker-dealers) who may be
subject to special rules. This summary does not address the U.S. federal income
tax consequences to a beneficial owner of common stock who, for U.S. federal
income tax purposes, is a nonresident alien individual, a foreign corporation, a
foreign partnership or a foreign estate or trust, nor does it consider the
effect of any foreign, state or local tax laws.

     BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER, EACH BENEFICIAL OWNER OF
SHARES OF COMMON STOCK SHOULD CONSULT SUCH BENEFICIAL OWNER'S OWN TAX ADVISOR TO
DETERMINE THE APPLICABILITY OF THE RULES DISCUSSED BELOW TO SUCH BENEFICIAL
OWNER AND THE PARTICULAR TAX EFFECTS TO SUCH BENEFICIAL OWNER OF THE MERGER,
INCLUDING THE APPLICATION AND EFFECT OF THE ALTERNATIVE MINIMUM TAX AND OF
STATE, LOCAL AND OTHER TAX LAWS.

     The receipt of cash for shares of common stock pursuant to the merger will
be a taxable transaction for U.S. federal income tax purposes. In general, for
U.S. federal income tax purposes, a beneficial owner of shares of common stock
will recognize capital gain or loss equal to the difference between the
beneficial owner's adjusted tax basis in the shares of common stock converted to
cash in the merger and the amount of cash received. Gain or loss must be
determined separately for each block of common stock (i.e., shares of common
stock acquired at the same cost in a single transaction) converted to cash in
the merger.

                                       16
   22

     Net capital gain (i.e., generally, capital gain in excess of capital loss)
recognized by individuals, estates and trusts from the sale of property held
more than one year will generally be taxed at a rate not to exceed 20% for U.S.
federal income tax purposes. Net capital gain from property held for one year or
less will be subject to tax at ordinary income tax rates. In addition, capital
gains recognized by a corporate taxpayer will be subject to tax at the ordinary
income tax rates applicable to corporations. In general, capital losses are
deductible only against capital gains and are not available to offset ordinary
income. However, individual taxpayers are allowed to offset a limited amount of
capital losses against ordinary income.

     Payments in connection with the merger may be subject to "backup
withholding" at a rate of 31%, unless a beneficial owner of common stock (1)
comes within certain exempt categories (including a corporation) or (2) provides
a certified taxpayer identification number on Form W-9 and otherwise complies
with the backup withholding rules. Backup withholding is not an additional tax;
any amounts so withheld may be credited against the U.S. federal income tax
liability of the beneficial holder subject to the withholding.

FINANCING OF THE MERGER

     The total amount of funds required by Marathon to pay the aggregate merger
consideration due to Pennaco stockholders at the closing of the merger, assuming
there are no Dissenting Shares, is expected to be $52.4 million. In addition,
Marathon expects that approximately $100,000 will be required to pay its
expenses and costs relating to the merger. Marathon plans to obtain all funds
needed for the merger through available cash or capital contributions or
intercompany loans of available cash from USX. Marathon has no alternative
financing plan to fund the payment for shares in the merger.

REGULATORY REQUIREMENTS

     Pennaco does not believe that any material federal or state regulatory
approvals, filings or notices are required by Pennaco in connection with the
merger other than such approvals, filings or notices required under federal
securities laws and the filing of the certificate of merger with the Secretary
of State of the State of Delaware.

INTERESTS OF CERTAIN PERSONS IN THE MERGER

     Pennaco stockholders should be aware that certain members of Pennaco's
Board of Directors and management have interests that may present them with
actual, potential or the appearance of potential conflicts of interest in
connection with the merger. The Board of Directors was aware of these potential
or actual conflicts of interest and considered them in approving the merger
agreement and the merger.

  Stock Options

     Under the terms of Pennaco's 1998 Stock Option and Incentive Plan, all
outstanding stock options granted under the plan vested on consummation of the
offer. As required by the merger agreement, the Pennaco Board took action to
provide that each stock option outstanding immediately prior to the acceptance
for payment of shares in the offer was canceled, with the holder becoming
entitled to receive the amount of cash for such stock option as provided in the
plan upon a change of control. Holders of approximately 96% of the outstanding
stock options agreed that each option held by such holder immediately prior to
the acceptance for payment of shares in the offer was canceled, with such holder
becoming entitled to receive an amount of cash for such option equal to (1) the
difference between $19.00 and the exercise price per share subject to such
option multiplied by (2) the number of shares subject to the option immediately
prior to its cancellation. Pennaco made payments aggregating $46.8 million in
connection with the cancellation of outstanding options.


     In addition, as required by the merger agreement, the Pennaco Board took
action so that the Pennaco 1998 Stock Option and Incentive Plan will terminate
as of the effective time of the merger. Pennaco has agreed to ensure that,
following the effective time, no holder of a stock option or any participant in
its

                                       17
   23

Stock Option and Incentive Plan or in other Pennaco benefit plan will have any
right under that plan to acquire any capital stock of Pennaco or the surviving
corporation.

  Employment Agreements and Parachute Tax Agreements

     Pennaco maintained employment agreements for its executive officers, Paul
M. Rady, Glen C. Warren, Terrell A. Dobkins, Brian A. Kuhn and Gregory V.
Gibson. Each executive's agreement provided that if, on or following a change in
control, the executive's employment with Pennaco were terminated by Pennaco
without cause, or due to his death or disability or by such executive due to an
adverse change in his status, duties, title, responsibility or authority prior
to the expiration of the agreement, such executive would be entitled to a cash
payment in consideration for his agreement not to compete with Pennaco in the
oil and gas exploration or production business within the Powder River Basin in
Wyoming for a period of two years. In accordance with their respective
employment agreements, Mr. Rady received a payment of $6.0 million, Mr. Warren
received $4.0 million and Mr. Gibson received $0.5 million. In addition, Mr.
Dobkins will receive $1.3 million and Mr. Kuhn will receive $1.0 million at the
end of February 2000.

     Pennaco entered into parachute tax agreements with each of the above-named
executive officers and certain other key members of Pennaco's management. The
agreements provided that in the event the respective employee became subject to
the excise tax imposed by Section 4999 of the Code on any "payment" (as defined
in Section 280G of the Code) provided by Pennaco or any other person as a
consequence of any change in control of Pennaco, the employee would be entitled
to an additional payment from Pennaco in the amount necessary to make the
employee "whole" on a net after-tax basis; i.e., to put the employee in the same
net after-tax position he would have been in had he not been subject to such
excise tax.

  Indemnification; Directors' and Officers' Insurance

     The merger agreement provides that, after the effective time, Marathon will
cause the surviving corporation to indemnify each person who is now, or has been
at any time prior to the date of the merger agreement, a director or officer of
Pennaco, to the fullest extent permitted by law, with respect to any liability,
loss, damage, judgment, fine, penalty, amount paid in settlement or compromise
with the approval of the surviving corporation (which approval shall not be
unreasonably withheld or delayed), cost or expense (including reasonable fees
and expenses of legal counsel) incurred in connection with any threatened or
actual action, suit or proceeding based on, or arising out of, the fact that
such person is or was a director or officer of Pennaco, in each case, to the
full extent that Marathon or Pennaco is permitted under applicable law to so
indemnify. Such indemnification rights will continue in full force and effect
for a period of six years from the effective time of the merger. However, all
rights to indemnification in respect of any indemnified liabilities asserted or
made within that six-year period will continue until the disposition of those
indemnified liabilities.

     The merger agreement provides that, for a period of six years after the
effective time of the merger, Marathon will cause to be maintained in effect
policies of directors' and officers' insurance, for the benefit of those persons
who are covered by Pennaco's directors' and officers' liability insurance at the
effective time, providing coverage with respect to matters occurring prior to
the effective time that is at least equal to the coverage provided under
Pennaco's directors' and officers' liability insurance policies existing on the
date of the merger agreement, to the extent that such liability insurance can be
maintained at an annual cost to Marathon not greater than 150 percent of the
premium for Pennaco's directors' and officers' liability insurance existing on
the date of the merger agreement. If, however, that insurance cannot be so
maintained at or below such cost, Marathon will cause the surviving corporation
to maintain as much of such insurance as can be so maintained at a cost equal to
150 percent of the annual premiums of Pennaco for that insurance.

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   24

LITIGATION MATTERS

     On January 5, 2001, following the issuance of a joint press release by
Marathon and Pennaco on December 22, 2000 announcing the merger agreement, two
purported stockholder class action complaints were filed against Pennaco and its
directors in the District Court, City and County of Denver, Colorado, styled
Harry Levy v. Pennaco Energy, Inc., et al., Case Number 01-CV-0072, and Richard
Stearns v. Pennaco Energy, Inc., et al., Case Number 01-CV-0073 (the "Colorado
Complaints"). On January 9, 2001, the day after the offer was commenced, two
similar purported stockholder class action lawsuits were filed against Pennaco,
its directors and Marathon Oil Acquisition 1 in the Court of Chancery of the
State of Delaware in and for New Castle County styled John Grillo v. Pennaco
Energy, Inc., et al., C.A. No. 18606 NC, and Thomas Turberg v. Pennaco Energy,
Inc., et al., C.A. No. 18607 NC (the "Delaware Complaints"). The Delaware
Complaints were subsequently consolidated into a single lawsuit, styled In re
Pennaco Energy, Inc. Shareholders Litigation, C.A. No. 18606-NC (the "Delaware
Action").

     The allegations in the Colorado Complaints are identical, the only
difference being the purported class representative in each action. Both
Colorado Complaints allege the same grounds for relief, namely that the
defendants breached their fiduciary duties to Pennaco's stockholders or are
participating in a scheme to deprive Pennaco's stockholders of the true value of
their investments in Pennaco. They further allege that the merger consideration
to be paid to Pennaco's stockholders is unconscionable, unfair and grossly
inadequate.

     The allegations in the Delaware Complaints are identical, the only
difference being the purported class representative in each action. Both
Delaware Complaints allege that Pennaco's directors have breached their
fiduciary duties to Pennaco's stockholders. Specifically, the Delaware
Complaints allege that the documents disseminated by the defendants in
connection with the offer contained material deficiencies in disclosure and
that, by disseminating those materials, the defendants violated their fiduciary
duties. They also allege that Pennaco's directors breached their fiduciary duty
of care and good faith by failing to make efforts to inform themselves of the
best value available for Pennaco, and that Marathon Oil Acquisition 1 aided and
abetted the alleged breaches of fiduciary duties by Pennaco's directors.

     Each of these lawsuits includes a request for a declaration that the action
is properly maintainable as a class action, and each seeks relief including
awards of unspecified damages and fees of attorneys and experts. Each lawsuit
also seeks to enjoin the transactions contemplated by the merger agreement, or
to rescind the transactions in the event they are consummated (or, in the case
of the Delaware Complaints, to obtain rescissory damages), and to require
Pennaco's directors to place Pennaco up for auction or otherwise employ a
process to ensure that the highest possible price is obtained for Pennaco.

     The plaintiffs in the Delaware Action filed a motion for preliminary
injunction and a motion for expedited proceedings. The Court of Chancery
scheduled an expedited hearing on the plaintiffs' motion for preliminary
injunction, and the parties immediately began conducting discovery on an
expedited basis. On February 1, 2001, the Court held a hearing on the
plaintiffs' motion for preliminary injunction. On February 5, 2001, the Court
issued its opinion denying plaintiffs' motion on the grounds that the plaintiffs
had not demonstrated a reasonable probability of success on the merits of their
claims so as to justify issuance of an injunction.

     Each of Pennaco, its directors and Marathon believes these lawsuits and the
claims made therein are without merit and intends to continue defending against
these lawsuits vigorously.

                                       19
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                                APPRAISAL RIGHTS

     Under Section 262 of the General Corporation Law of the State of Delaware
("DGCL"), any holder of Pennaco common stock who does not wish to accept the
merger consideration may elect to have the fair value of such stockholder's
shares (exclusive of any element of value arising from the accomplishment or
expectation of the merger) judicially determined and paid to such stockholder in
cash, together with a fair rate of interest, if any; provided that such
stockholder complies with the provisions of Section 262. The following
discussion is not a complete statement of the law pertaining to appraisal rights
under the DGCL and is qualified in its entirety by the full text of Section 262,
a copy of which is attached as Appendix C to this Information Statement. All
references in this summary to a "stockholder" are references to any record
holder of shares of Pennaco common stock as to which appraisal rights are
asserted. A person having a beneficial interest in shares of common stock held
of record in the name of another person, such as a broker or nominee, must act
promptly to cause the record holder to follow properly the steps summarized
below and in a timely manner to perfect appraisal rights.

     Under Section 262 of the DGCL, where a proposed merger is to be submitted
for approval at a meeting of stockholders, as in the case of the special meeting
of Pennaco stockholders described in this Information Statement, the
corporation, not less than 20 days prior to the meeting, must notify each of its
stockholders entitled to appraisal rights that such appraisal rights are
available and include in such notice a copy of Section 262. This Information
Statement constitutes such notice to the holders of Pennaco common stock, and
the applicable statutory provisions of the DGCL are attached to this Information
Statement as Appendix C. Any stockholder who wishes to exercise such appraisal
rights or who wishes to preserve the right to do so should review carefully the
following discussion and Appendix C to this Information Statement, because
failure to comply with the procedures specified in Section 262 timely and
properly will result in the loss of appraisal rights. Moreover, because of the
complexity of the procedures for exercising the right to seek appraisal of the
common stock, Pennaco believes that stockholders who consider exercising such
rights should seek the advice of counsel.

     Any holder of common stock wishing to demand appraisal under Section 262 of
the DGCL must satisfy each of the following conditions:

     - Such stockholder must deliver to Pennaco a written demand for appraisal
       of such stockholder's shares before the vote on the merger agreement at
       the special meeting, which demand will be sufficient if it reasonably
       informs Pennaco of the identity of the stockholder and that the
       stockholder intends thereby to demand the appraisal of such holder's
       shares.

     - Such stockholder must not vote its shares of common stock in favor of the
       merger agreement.

     - Such stockholder must continuously hold such shares from the date of
       making the demand through the effective time of the merger. Accordingly,
       a stockholder who is the record holder of shares of common stock on the
       date the written demand for appraisal is made but who thereafter
       transfers such shares prior to the effective time of the merger will lose
       any right to appraisal in respect of those shares.

     Neither voting against, abstaining from voting on or failing to vote on the
proposal to adopt the merger agreement will constitute a written demand for
appraisal within the meaning of Section 262. The written demand for appraisal
must be in addition to and separate from any action (or inaction) relating to
the vote.

     Only a holder of record of shares of common stock issued and outstanding
immediately prior to the effective time of the merger is entitled to assert
appraisal rights for the shares of common stock registered in that holder's
name. A demand for appraisal should be executed by or on behalf of the
stockholder of record, fully and correctly, as such stockholder's name appears
on such stock certificates, should specify the stockholder's name and mailing
address and the number of shares of common stock owned and should state that
such stockholder intends thereby to demand appraisal of such stockholder's
common stock.

                                       20
   26

     If the shares are owned of record in a fiduciary capacity, such as by a
trustee, guardian or custodian, execution of the demand should be made in that
capacity. If the shares are owned of record by more than one person as in a
joint tenancy or tenancy in common, the demand should be executed by or on
behalf of all owners. An authorized agent, including one or more joint owners,
may execute a demand for appraisal on behalf of a stockholder; however, the
agent must identify the record owner or owners and expressly disclose the fact
that, in executing the demand, the agent is acting as agent for such owner or
owners.

     A record holder such as a broker who holds shares as nominee for several
beneficial owners may exercise appraisal rights with respect to the shares held
for one or more beneficial owners while not exercising such rights with respect
to the shares held for one or more other beneficial owners; in such case, the
written demand should set forth the number of shares as to which appraisal is
sought, and where no number of shares is expressly mentioned, the demand will be
presumed to cover all shares held in the name of the record owner. Stockholders
who hold their shares in brokerage accounts or other nominee forms and who wish
to exercise appraisal rights are urged to consult with their brokers to
determine the appropriate procedures for the making of a demand for appraisal by
such a nominee.


     A stockholder who elects to exercise appraisal rights pursuant to Section
262 should mail or deliver a written demand to Pennaco Energy, Inc., 1400 16th
Street, Suite 510, Denver, Colorado 80202, Attention: Secretary.


     Within 10 days after the effective time of the merger, the surviving
corporation must send a notice as to the effectiveness of the merger to each
former stockholder of Pennaco who has made a written demand for appraisal in
accordance with Section 262 and who has not voted in favor of the merger
agreement. Within 120 days after the effective time, but not thereafter, either
the surviving corporation or any holder of Dissenting Shares who has complied
with the requirements of Section 262 may file a petition in the Delaware
Chancery Court demanding a determination of the value of all Dissenting Shares
held by dissenting stockholders. Pennaco is under no obligation to and has no
present intent to file a petition for appraisal, and stockholders seeking to
exercise appraisal rights should not assume that the surviving corporation will
file such a petition or that the surviving corporation will initiate any
negotiations with respect to the fair value of such shares. Accordingly,
stockholders who desire to have their shares appraised should initiate any
petitions necessary for the perfection of their appraisal rights within the time
periods and in the manner prescribed in Section 262. Inasmuch as Pennaco has no
obligation to file such a petition, the failure of a stockholder to do so within
the period specified could nullify such stockholder's previous written demand
for appraisal.

     Within 120 days after the effective time of the merger, any stockholder who
has complied with the provisions of Section 262 to that point in time will be
entitled to receive from the surviving corporation, upon written request, a
statement setting forth the aggregate number of shares not voted in favor of the
merger agreement and with respect to which demands for appraisal have been
received and the aggregate number of holders of such shares. The surviving
corporation must mail such statement to the stockholder within 10 days of
receipt of such request or within 10 days after expiration of the period for
delivery of demands for appraisals under Section 262, whichever is later.

     A stockholder timely filing a petition for appraisal with the Delaware
Court of Chancery must deliver a copy to the surviving corporation, which will
then be obligated within 20 days to provide the Delaware Court of Chancery with
a duly verified list containing the names and addresses of all stockholders who
have demanded appraisal of their shares. After notice to such stockholders, the
Delaware Court of Chancery is empowered to conduct a hearing on the petition to
determine which stockholders are entitled to appraisal rights. The Delaware
Court of Chancery may require stockholders who have demanded an appraisal for
their shares and who hold stock represented by certificates to submit their
certificates to the Register in Chancery for notation thereon of the pendency of
the appraisal proceedings, and if any stockholder fails to comply with the
requirement, the Delaware Court of Chancery may dismiss the proceedings as to
that stockholder.

     After determining the stockholders entitled to an appraisal, the Delaware
Court of Chancery will appraise the "fair value" of their shares, exclusive of
any element of value arising from the
                                       21
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accomplishment or expectation of the merger, together with a fair rate of
interest, if any, to be paid upon the amount determined to be the fair value.
The costs of the action may be determined by the Delaware Court of Chancery and
taxed upon the parties as the Delaware Court of Chancery deems equitable. Upon
application of a holder of Dissenting Shares, the Delaware Court of Chancery may
also order that all or a portion of the expenses incurred by any stockholder in
connection with the appraisal proceeding, including, without limitation,
reasonable attorneys' fees and the fees and expenses of experts, be charged pro
rata against the value of all of the shares entitled to appraisal. STOCKHOLDERS
CONSIDERING SEEKING APPRAISAL SHOULD BE AWARE THAT THE FAIR VALUE OF THEIR
SHARES AS DETERMINED UNDER SECTION 262 COULD BE MORE THAN, THE SAME AS OR LESS
THAN THE MERGER CONSIDERATION THEY WOULD RECEIVE PURSUANT TO THE MERGER
AGREEMENT IF THEY DID NOT SEEK APPRAISAL OF THEIR SHARES. STOCKHOLDERS SHOULD
ALSO BE AWARE THAT INVESTMENT BANKING OPINIONS ARE NOT OPINIONS AS TO FAIR VALUE
UNDER SECTION 262.

     In determining fair value and, if applicable, a fair rate of interest, the
Delaware Court of Chancery is to take into account all relevant factors. In
Weinberger v. UOP, Inc., the Delaware Supreme Court discussed the factors that
could be considered in determining fair value in an appraisal proceeding,
stating that "proof of value by any techniques or methods which are generally
considered acceptable in the financial community and otherwise admissible in
court" should be considered, and that "fair price obviously requires
consideration of all relevant factors involving the value of a company." The
Delaware Supreme Court stated that, in making this determination of fair value,
the court must consider market value, asset value, dividends, earnings
prospects, the nature of the enterprise and any other facts that could be
ascertained as of the date of the merger that throw any light on future
prospects of the merged corporation. In Weinberger, the Delaware Supreme Court
stated that "elements of future value, including the nature of the enterprise,
which are known or susceptible of proof as of the date of the merger and not the
product of speculation, may be considered." Section 262 provides that fair value
is to be "exclusive of any element of value arising from the accomplishment or
expectation of the merger."

     Any stockholder who has duly demanded an appraisal in compliance with
Section 262 will not, after the effective time of the merger, be entitled to
vote the shares subject to such demand for any purpose or to receive payment of
dividends or other distributions on those shares (except dividends or other
distributions payable to holders of record of shares as of a record date prior
to the effective time of the merger).

     Any stockholder may withdraw its demand for appraisal and accept the merger
consideration by delivering to the surviving corporation a written withdrawal of
such stockholder's demand for appraisal, except that (1) any such attempt to
withdraw made more than 60 days after the effective time of the merger will
require written approval of the surviving corporation and (2) no appraisal
proceeding in the Delaware Court of Chancery will be dismissed as to any
stockholder without the approval of the Delaware Court of Chancery, and such
approval may be conditioned on such terms as the Delaware Court of Chancery
deems just. If the surviving corporation does not approve a stockholder's
request to withdraw a demand for appraisal when such approval is required or if
the Delaware Court of Chancery does not approve the dismissal of an appraisal
proceeding, the stockholder would be entitled to receive only the appraised
value determined in any such appraisal proceeding, which value could be more
than, the same as or less than the value of the merger consideration.

     FAILURE TO COMPLY STRICTLY WITH ALL OF THE PROCEDURES SET FORTH IN SECTION
262 OF THE DGCL WILL RESULT IN THE LOSS OF A STOCKHOLDER'S STATUTORY APPRAISAL
RIGHTS. CONSEQUENTLY, ANY STOCKHOLDER WISHING TO EXERCISE APPRAISAL RIGHTS IS
URGED TO CONSULT LEGAL COUNSEL BEFORE ATTEMPTING TO EXERCISE THOSE RIGHTS.

                                       22
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                              SECURITIES OWNERSHIP

     This section provides information as of February 23, 2001 with respect to
the beneficial ownership of Pennaco's common stock by:

     - each person or group known by Pennaco to own more than 5% of the common
       stock;

     - each current director and executive officer of Pennaco; and

     - all current directors and executive officers of Pennaco as a group.

     Under the SEC rules generally, a person is deemed to be a "beneficial
owner" of a security if he has or shares the power to vote or direct the voting
of such security, or the power to dispose or to direct the disposition of such
security. Thus, more than one person may be deemed a beneficial owner of the
same security. Unless otherwise indicated, the mailing address of each of the
persons shown is c/o Marathon Oil Company, 5555 San Felipe, Houston, Texas
77056.




                                                                            PERCENTAGE OF
                                                              NUMBER OF      OUTSTANDING
NAME OF BENEFICIAL OWNER                                     SHARES OWNED   SHARES OWNED
- ------------------------                                     ------------   -------------
                                                                      
Marathon Oil Acquisition 1, Ltd.(1)........................   17,331,215        86.3%
Marathon Oil Company(1)....................................   17,331,215        86.3%
USX Corporation(1)
  600 Grant Street
  Pittsburgh, Pennsylvania 15219-4776......................   17,331,215        86.3%
Philip G. Behrman(2).......................................           --          --
G. David Golder(2).........................................           --          --
Steven B. Hinchman(2)......................................           --          --
David W. Lanza.............................................           --          --
John T. Mills(2)...........................................           --          --
Richard J. Murphy(2).......................................           --          --
Kurt M. Petersen...........................................           --          --
John F. Meara(2)...........................................           --          --
Directors and executive officers of Pennaco as a group (8
  persons)(2)..............................................           --          --



- ---------------

(1) Includes 17,331,215 shares owned of record by Marathon Oil Acquisition 1,
    Ltd. and beneficially by Marathon Oil Company and USX Corporation. Marathon
    Oil Acquisition 1, Marathon and USX share voting and investment power with
    respect to such shares.

(2) Does not include 17,331,215 shares owned of record by Marathon Oil
    Acquisition 1, which such directors and executive officers of Pennaco may be
    deemed to beneficially own by virtue of their positions with Marathon. Each
    of Messrs. Behrman, Golder, Hinchman, Mills, Murphy and Meara disclaim
    beneficial ownership of the shares owned by Marathon Oil Acquisition 1.

                                       23
   29

                      WHERE YOU CAN FIND MORE INFORMATION

     Pennaco files annual, quarterly and special reports, proxy statements and
other information with the SEC. You can read and copy any materials Pennaco
files with the SEC at the SEC's public reference room at 450 Fifth Street, N.W.,
Washington, D.C. 20549. You can obtain information about the operation of the
SEC's public reference room by calling the SEC at 1-800-SEC-0330. The SEC also
maintains a Web site that contains information Pennaco files electronically with
the SEC, which you can access over the Internet at http://www.sec.gov.

     Pennaco is incorporating by reference information it files with the SEC,
which means that it is disclosing important information to you by referring you
to those documents. The information Pennaco incorporates by reference is an
important part of this Information Statement, and later information that Pennaco
files with the SEC automatically will update and supersede this information.
Pennaco incorporates by reference the following documents and any future filings
it makes with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities
Exchange Act of 1934 until the date of the special meeting of Pennaco
stockholders:

     - its annual report on Form 10-KSB for the year ended December 31, 1999;

     - its quarterly reports on Form 10-Q for the quarterly periods ended March
       31, 2000, June 30, 2000 and September 30, 2000; and

     - its current reports on Form 8-K filed on December 27, 2000, January 5,
       2001 and February 14, 2001.

     Pennaco undertakes to provide by first class mail, without charge and
within one business day of receipt of any request, to any person to whom a copy
of this Information Statement has been delivered, a copy of any or all of the
documents referred to above which have been incorporated by reference in this
Information Statement, other than exhibits to those documents (unless the
exhibits are specifically incorporated by reference into those documents).
Requests for such copies should be directed to Marathon Oil Company, 5555 San
Felipe, Houston, Texas 77056, Attention: Secretary; telephone number (713)
629-6600.

                                            By order of the Board of Directors,

                                            /s/ STEVEN B. HINCHMAN

                                            Steven B. Hinchman
                                            President

Denver, Colorado

February 26, 2001


                                       24
   30


                                                                      APPENDIX A


                              [LEHMAN BROS. LOGO]

                                                               December 22, 2000

Board of Directors
Pennaco Energy, Inc.
1050 17th Street, Suite 700
Denver, CO 80265

Members of the Board:

     We understand that Pennaco Energy, Inc. (the "Company") has entered into an
agreement with Marathon Oil Company ("Marathon") pursuant to which (i) Marathon
or an affiliate thereof will make a tender offer for all outstanding shares of
common stock of the Company at a price of $19.00 per share, subject to certain
terms and conditions, including that at least a majority of the fully diluted
shares of Company common stock be validly tendered and not withdrawn prior to
the expiration of the tender offer and (ii) following the completion of the
tender offer, all of the remaining shares of Company common stock will be
acquired by Marathon or an affiliate thereof through a merger transaction in
which all such shares not held by Marathon or the Company are converted into the
right to receive $19.00 per share (collectively, the "Proposed Transaction").
The terms and conditions of the Proposed Transaction are set forth in more
detail in the draft of the Agreement and Plan of Merger dated December 20, 2000
between the Company, Marathon and Marathon Oil Acquisition I, Ltd. (the
"Agreement").

     We have been requested by the Board of Directors of the Company to render
our opinion with respect to the fairness, from a financial point of view, to the
Company's stockholders of the consideration to be offered to such stockholders
in the Proposed Transaction. We have not been requested to opine as to, and our
opinion does not in any manner address, the Company's underlying business
decision to proceed with or effect the Proposed Transaction.

     In arriving at our opinion, we reviewed and analyzed: (1) the Agreement and
the specific terms of the Proposed Transaction, (2) publicly available
information concerning the Company that we believe to be relevant to our
analysis, including the Company's Annual Report for the year ended December 31,
1999 and the Company's Quarterly Report for the period ended September 30, 2000,
(3) financial and operating information with respect to the business, operations
and prospects of the Company furnished to us by the Company, including financial
projections for the Company for the period from 2001 through 2005 prepared by
the Company, (4) certain estimates of proved and non-proved reserves and future
production, revenue, operating costs and capital investment for the Company
prepared by the Company, (5) a trading history of the Company's common stock
from December 19, 1999 to the present and a comparison of that trading history
with those of other companies that we deemed relevant, (6) a comparison of the
historical financial results and present financial condition of the Company with
those of other companies that we deemed relevant and (7) a comparison of the
financial terms of the Proposed Transaction with the financial terms of certain
other oil and gas transactions that we deemed relevant. In addition, we have had
discussions with the management of the Company concerning the Company's
business, operations, assets, financial condition, prospects, reserves,
production profiles and exploration programs and have undertaken such other
studies, analyses and investigations as we deemed appropriate.

     In arriving at our opinion, we have assumed and relied upon the accuracy
and completeness of the financial and other information used by us without
assuming any responsibility for independent verification of such information and
have further relied upon the assurances of management of the Company that they
are not aware of any facts or circumstances that would make such information
inaccurate or misleading.
                                       A-1
   31

With respect to the financial projections of the Company and the estimates of
future production, revenue, operating costs and capital investment for the
Company, each as prepared by the Company, upon advice of the Company, we have
assumed that such projections and estimates have been reasonably prepared on a
basis reflecting the best currently available estimates and judgements of the
Company's management as to the future performance of the Company, and that the
Company will perform substantially in accordance with such projections and
estimates. However, for purposes of our analysis, we also have considered
certain somewhat more conservative assumptions which resulted in certain
adjustments to the projections and estimates of the Company. We have discussed
these adjusted projections and estimates with the management of the Company and
they have agreed with the appropriateness of the use of such adjusted
projections and estimates in performing our analysis. In arriving at our
opinion, we have not conducted a physical inspection of the properties and
facilities of the Company and have not made or obtained any evaluations or
appraisals of the assets or liabilities of the Company. In addition, you have
not authorized us to solicit, and we have not solicited, any indications of
interest from any third party with respect to the purchase of all or a part of
the Company's business. Our opinion necessarily is based upon market, economic
and other conditions as they exist on, and can be evaluated as of, the date of
this letter.

     Based upon and subject to the foregoing, we are of the opinion as of the
date hereof that, from a financial point of view, the consideration to be
offered to the Company's stockholders in the Proposed Transaction is fair to
such stockholders.

     We have acted as financial advisor to the Company in connection with the
Proposed Transaction and will receive a fee for our services which is contingent
upon the consummation of the Proposed Transaction. In addition, the Company has
agreed to indemnify us for certain liabilities that may arise out of the
rendering of this opinion. We also have performed various investment banking
services for Marathon in the past and have received customary fees for such
services. In the ordinary course of our business, we actively trade in the
securities of the Company and Marathon for our own account and for the accounts
of our customers and, accordingly, may at any time hold a long or short position
in such securities.

     This opinion is for the use and benefit of the Board of Directors of the
Company and is rendered to the Board of Directors in connection with its
consideration of the Proposed Transaction. This opinion is not intended to be
and does not constitute a recommendation to any stockholder of the Company as to
whether to accept the consideration to be offered to the stockholders in
connection with the Proposed Transaction.


                                            Very truly yours,


                                            LEHMAN BROTHERS

                                       A-2
   32
                                                                      APPENDIX B

                                                                     [CONFORMED]

================================================================================






                          AGREEMENT AND PLAN OF MERGER




                          Dated as of December 22, 2000




                                      among



                              MARATHON OIL COMPANY,



                        MARATHON OIL ACQUISITION 1, LTD.



                                       and



                              PENNACO ENERGY, INC.





================================================================================


   33


                                TABLE OF CONTENTS



                                                                           
                                    ARTICLE I

                            THE OFFER AND THE MERGER

Section 1.01. The Offer........................................................1
Section 1.02. Company Actions..................................................3
Section 1.03. The Merger.......................................................4
Section 1.04. Closing..........................................................4
Section 1.05. Effective Time...................................................4
Section 1.06. Effects..........................................................4
Section 1.07. Certificate of Incorporation and Bylaws..........................5
Section 1.08. Directors........................................................5
Section 1.09. Officers.........................................................5

                                   ARTICLE II

                       EFFECT ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

Section 2.01. Effect on Capital Stock..........................................5
Section 2.02. Exchange of Certificates.........................................6

                                   ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

Section 3.01. Organization, Standing and Power.................................8
Section 3.02. Subsidiaries; Equity Interests...................................9
Section 3.03. Capital Structure................................................9
Section 3.04. Authority; Execution and Delivery; Enforceability...............10
Section 3.05. No Conflicts; Consents..........................................11
Section 3.06. SEC Documents; Undisclosed Liabilities..........................12
Section 3.07. Information Supplied............................................13
Section 3.08. Absence of Certain Changes or Events............................13
Section 3.09. Taxes...........................................................15
Section 3.10. Absence of Changes in Benefit Plans.............................16
Section 3.11. ERISA Compliance; Excess Parachute Payments.....................17
Section 3.12. Litigation......................................................19



                                       i
   34



                                                                           
Section 3.13. Compliance with Applicable Laws.................................19
Section 3.14. Environmental Matters...........................................19
Section 3.15. Contracts.......................................................21
Section 3.16. Labor Matters...................................................21
Section 3.17. Brokers; Fees and Expenses......................................21
Section 3.18. Opinion of Financial Advisor....................................22
Section 3.19. Potential Conflicts of Interest.................................22
Section 3.20. Reserve Information.............................................22

                                   ARTICLE IV

                REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB

Section 4.01. Organization, Standing and Power................................22
Section 4.02. Sub.............................................................22
Section 4.03. Authority; Execution and Delivery; Enforceability...............23
Section 4.04. No Conflicts; Consents..........................................23
Section 4.05. Information Supplied............................................24
Section 4.06. Brokers.........................................................24
Section 4.07. Financing.......................................................24
Section 4.08. Litigation......................................................24
Section 4.09. Ownership of Company Common Stock...............................25

                                    ARTICLE V

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

Section 5.01. Conduct of Business.............................................25
Section 5.02. No Solicitation.................................................27

                                   ARTICLE VI

                              ADDITIONAL AGREEMENTS

Section 6.01. Preparation of Proxy Statement; Stockholders Meeting............29
Section 6.02. Access to Information; Confidentiality..........................30
Section 6.03. Reasonable Best Efforts; Notification...........................30
Section 6.04. Stock Options...................................................31
Section 6.05. Indemnification.................................................32
Section 6.06. Fees and Expenses...............................................33
Section 6.07. Public Announcements............................................34
Section 6.08. Transfer Taxes..................................................34
Section 6.09. Directors.......................................................34



                                       ii
   35



                                                                           
Section 6.10. CMS Operating Agreement.........................................35
Section 6.11. Further Assurances..............................................35

                                   ARTICLE VII

                              CONDITIONS PRECEDENT

Section 7.01. Conditions to Each Party's Obligation to Effect the Merger......35

                                  ARTICLE VIII

                        TERMINATION, AMENDMENT AND WAIVER

Section 8.01. Termination.....................................................36
Section 8.02. Effect of Termination...........................................38
Section 8.03. Amendment.......................................................39
Section 8.04. Extension; Waiver...............................................39
Section 8.05. Procedure for Termination, Amendment, Extension or Waiver.......39

                                   ARTICLE IX

                               GENERAL PROVISIONS

Section 9.01. Nonsurvival of Representations and Warranties...................39
Section 9.02. Notices.........................................................39
Section 9.03. Definitions.....................................................40
Section 9.04. Interpretation..................................................41
Section 9.05. Severability....................................................41
Section 9.06. Counterparts....................................................42
Section 9.07. Entire Agreement; No Third-Party Beneficiaries..................42
Section 9.08. Governing Law...................................................42
Section 9.09. Assignment......................................................42
Section 9.10. Limitations on Warranties.......................................42



                                      iii
   36


                             INDEX OF DEFINED TERMS



Term                                                                     Section
- ----                                                                     -------

                                                                     
affiliate...................................................................9.03
Agreement...............................................................Preamble
Appraisal Statute........................................................2.01(d)
business day................................................................9.03
Certificate of Merger.......................................................1.05
Certificates.............................................................2.02(b)
Closing.....................................................................1.04
Closing Date................................................................1.04
CMS.........................................................................6.10
Code.....................................................................2.02(g)
Company.................................................................Preamble
Company Benefit Agreements..................................................3.10
Company Benefit Plans.......................................................3.10
Company Board............................................................1.02(a)
Company Bylaws..............................................................3.01
Company Charter.............................................................3.01
Company Common Stock....................................................Recitals
Company Disclosure Letter................................................3.05(a)
Company Material Adverse Effect.............................................9.03
Company Multiemployer Pension Plan.......................................3.11(c)
Company Pension Plans....................................................3.11(a)
Company Right............................................................3.03(a)
Company Rights Agreement.................................................3.03(a)
Company SEC Documents....................................................3.06(a)
Company Stock Option.....................................................6.04(d)
Company Stock Plan.......................................................6.04(d)
Company Stockholder Approval.............................................3.04(a)
Company Stockholders Meeting.............................................6.01(b)
Company Takeover Proposal................................................5.02(c)
Confidentiality Agreement................................................6.02(b)
Consent..................................................................3.05(b)
Contract.................................................................3.03(a)
DGCL........................................................................1.03
Dissent Shares...........................................................2.01(d)
Effective Time..............................................................1.05
Environmental Claim......................................................3.14(a)
Environmental Laws.......................................................3.14(a)
ERISA....................................................................3.11(a)
ERISA Affiliate..........................................................3.11(c)
Exchange Act.............................................................3.05(b)
Exchange Fund............................................................2.02(a)
Expiration Date..........................................................1.01(a)
Filed Company SEC Documents.................................................3.08
Fully Diluted Shares.....................................................Annex I
GAAP.....................................................................3.06(a)



                                       iv
   37




Term                                                                     Section
- ----                                                                     -------

                                                                     
Governmental Entity......................................................3.05(b)
Hazardous Substance......................................................3.14(a)
in the ordinary course of business..........................................9.03
Indemnified Liabilities..................................................6.05(a)
Indemnified Parties......................................................6.05(a)
Indemnified Party........................................................6.05(a)
Independent Directors.......................................................6.09
Information Statement....................................................1.02(b)
Judgment.................................................................3.05(a)
Law......................................................................3.05(a)
Liens....................................................................3.05(a)
Material Contracts..........................................................3.15
Merger..................................................................Recitals
Merger Consideration.................................................2.01(c)(ii)
Minimum Tender Condition.................................................Annex I
Offer...................................................................Recitals
Offer Documents..........................................................1.01(b)
Offer Price.............................................................Recitals
Parent..................................................................Preamble
Parent Material Adverse Effect...........................................4.04(a)
Paying Agent.............................................................2.02(a)
Permits..................................................................3.13(b)
person......................................................................9.03
Primary Company Executives...............................................3.11(f)
Proxy Statement..........................................................3.05(b)
Representatives..........................................................5.02(a)
Rights Agent.............................................................3.03(a)
Royalty..................................................................3.09(g)
Royalty Return...........................................................3.09(g)
Ryder Scott.................................................................3.20
Schedule 14D-9...........................................................1.02(b)
SEC......................................................................1.01(a)
Securities Act...........................................................3.06(a)
Sub.....................................................................Preamble
subsidiary..................................................................9.03
Superior Company Proposal................................................5.02(c)
Surviving Corporation.......................................................1.03
Tax Return...............................................................3.09(g)
Taxes....................................................................3.09(g)
Termination Fee..........................................................6.06(b)
Transactions.............................................................1.02(a)
Transfer Taxes..............................................................6.08
USX......................................................................3.04(b)
Warrants.................................................................3.03(a)



                                       v
   38


         AGREEMENT AND PLAN OF MERGER dated as of December 22, 2000 (this
"Agreement") among MARATHON OIL COMPANY, an Ohio corporation ("Parent"),
MARATHON OIL ACQUISITION 1, LTD., a Delaware corporation and a direct wholly
owned subsidiary of Parent ("Sub"), and PENNACO ENERGY, INC., a Delaware
corporation (the "Company").

         WHEREAS the respective Boards of Directors of Parent, Sub and the
Company have approved the acquisition of the Company by Parent on the terms and
subject to the conditions set forth in this Agreement; and

         WHEREAS, in furtherance of such acquisition, Parent proposes to cause
Sub to make a tender offer (as it may be amended from time to time as permitted
under this Agreement, the "Offer") to purchase all the outstanding shares of
common stock, par value $0.001 per share, of the Company, including the
associated Company Rights (the "Company Common Stock"), at a price per share of
$19.00, net to the seller in cash (such amount, or any greater amount per share
paid pursuant to the Offer, the "Offer Price"), without interest thereon, on the
terms and subject to the conditions set forth in this Agreement; and

         WHEREAS the respective Boards of Directors of Parent and Sub have
approved the merger (the "Merger") of Sub into the Company on the terms and
subject to the conditions set forth in this Agreement, whereby each issued share
of Company Common Stock not owned directly or indirectly by Parent or the
Company shall be converted into the right to receive an amount in cash equal to
the Offer Price; and

         WHEREAS, the Board of Directors of the Company has approved the Offer
and the Merger and resolved to recommend that holders of shares of Company
Common Stock tender their shares pursuant to the Offer and approve and adopt
this Agreement and the Merger;

         NOW, THEREFORE, in consideration of the foregoing and the
representations, warranties, covenants and other terms contained in this
Agreement, the parties hereto, intending to be legally bound hereby, agree as
follows:

                                   ARTICLE I

                            THE OFFER AND THE MERGER

         Section 1.01. The Offer.

                  (a) Subject to the conditions of this Agreement, no earlier
than January 8, 2001 and no later than January 12, 2001, Sub shall, and Parent
shall cause Sub to, commence the Offer within the meaning of the applicable
rules and regulations of the Securities and Exchange Commission (the "SEC");
provided, however, that the obligation of Sub to, and of Parent to cause Sub to,
commence the Offer and accept for payment, and pay for, any shares of Company
Common Stock tendered pursuant to the Offer is subject to the Minimum Tender
Condition and the


                                       1
   39


satisfaction or waiver of the other conditions set forth in Annex I. The initial
expiration date of the Offer (the "Expiration Date") shall be the 20th business
day following the commencement of the Offer (determined pursuant to Rule 14d-2
promulgated by the SEC). Sub expressly reserves the right to modify the terms
and conditions of the Offer and to waive any condition set forth in Annex I
(other than the Minimum Tender Condition), except that, without the prior
written consent of the Company, Sub shall not (i) reduce the number of shares of
Company Common Stock subject to the Offer, (ii) reduce the price per share of
Company Common Stock to be paid pursuant to the Offer, (iii) reduce or modify
the Minimum Tender Condition, (iv) modify or add to the conditions set forth in
Annex I in any manner adverse to the holders of Company Common Stock (other than
Parent and its subsidiaries), (v) except as provided in the next sentence,
extend the Offer or (vi) change the form of consideration payable in the Offer.
Notwithstanding the foregoing, Sub may, without the consent of the Company, (i)
extend the Offer in increments of not more than five business days each, if at
the scheduled Expiration Date of the Offer any of the conditions to Sub's
obligation to purchase shares of Company Common Stock are not satisfied, until
such time as such conditions are satisfied or waived, (ii) extend the Offer for
any period required by any rule, regulation, interpretation or position of the
SEC or the staff thereof applicable to the Offer and (iii) make available a
subsequent offering period (within the meaning of Rule 14d-11 promulgated by the
SEC). Without limiting the right of Sub to extend the Offer, in the event that
the Minimum Tender Condition is not satisfied at the scheduled Expiration Date
of the Offer, at the request of the Company, Sub shall, and Parent shall cause
Sub to, extend the Expiration Date of the Offer in increments of five business
days each until the earliest to occur of (v) the date that is 60 days after the
initial Expiration Date, (w) the satisfaction of the Minimum Tender Condition,
(x) the reasonable determination by Parent that the Minimum Tender Condition is
not capable of being satisfied on or prior to the date that is 60 days after the
initial Expiration Date, (y) the termination of this Agreement in accordance
with its terms and (z) April 30, 2001. On the terms and subject to the
conditions of the Offer and this Agreement, Sub shall, and Parent shall cause
Sub to, accept for payment and pay for all shares of Company Common Stock
validly tendered and not withdrawn pursuant to the Offer as soon as practicable
after the expiration of the Offer and in any event not later than three business
days after such expiration.

                  (b) As soon as practicable on the date of commencement of the
Offer, Sub shall, and Parent shall cause Sub to, file with the SEC a Tender
Offer Statement on Schedule TO with respect to the Offer, which shall contain or
incorporate by reference an offer to purchase and a related letter of
transmittal and any related documents (such Schedule TO and the documents
included or incorporated by reference therein pursuant to which the Offer will
be made, together with any supplements or amendments thereto, the "Offer
Documents"). The Company shall cooperate in the preparation of the Offer
Documents, and the Company and its counsel will be given a reasonable
opportunity to review and comment on the Offer Documents before they are filed
with the SEC. Each of Parent, Sub and the Company shall promptly correct any
information provided by it for use in the Offer Documents if and to the extent
that such information shall have become false or misleading in any material
respect, and each of Parent and Sub shall take all steps necessary to amend or
supplement the Offer Documents and to cause the Offer Documents as so amended or
supplemented to be filed with the SEC and to be disseminated to the Company's
stockholders, in each case as and to the extent required by applicable federal
securities laws. Parent and Sub shall provide the Company and its counsel with
any comments Parent, Sub or their counsel may receive from the SEC or its staff
with respect to the Offer Documents promptly after the receipt of such


                                       2
   40


comments and shall consult with the Company and its counsel prior to responding
to any such comments.

         Section 1.02. Company Actions.

                  (a) The Company hereby approves of and consents to the Offer,
the Merger and the other transactions contemplated by this Agreement
(collectively, the "Transactions"). The Company hereby consents to the inclusion
in the Offer Documents of the recommendation of the Board of Directors of the
Company (the "Company Board") described in Section 3.04(b)(iii); provided,
however, that prior to the consummation of the Offer, the Company Board reserves
the right to modify or withdraw such recommendation in a manner adverse to
Parent and Sub if (and only if) a majority of the entire Company Board shall
have determined in good faith, based on (among other things) the advice of its
independent financial advisors and outside counsel, that this Agreement or the
Merger is no longer in the best interests of the Company's stockholders and that
such modification or withdrawal is, therefore, required in order to satisfy the
Company Board's fiduciary duties to the Company's stockholders under applicable
Law. The Company has been advised by each of its directors and executive
officers that he intends either to tender all shares of Company Common Stock
beneficially owned by him to Sub pursuant to the Offer or to vote such shares in
favor of the approval and adoption by the stockholders of the Company of this
Agreement and the Transactions; provided, however, that such directors and
executive officers shall have no obligation under this Agreement to so tender or
vote their shares if this Agreement is terminated in accordance with its terms.

                  (b) As soon as practicable on the date of commencement of the
Offer, the Company shall file with the SEC a Solicitation/Recommendation
Statement on Schedule 14D-9, including an Information Statement containing the
information required by Section 14(f) of the Exchange Act and Rule 14f-1
promulgated thereunder (the "Information Statement"), with respect to the Offer
(such Schedule 14D-9 and Information Statement, as amended or supplemented from
time to time, the "Schedule 14D-9") containing the recommendation of the Company
Board described in Section 3.04(b)(iii) and shall disseminate the Schedule 14D-9
to the holders of Company Common Stock as and to the extent required by
applicable federal securities laws. Each of Parent, Sub and their counsel shall
be given a reasonable opportunity to review and comment on the Schedule 14D-9
before it is filed with the SEC. Each of the Company, Parent and Sub shall
promptly correct any information provided by it for use in the Schedule 14D-9 if
and to the extent that such information shall have become false or misleading in
any material respect, and the Company shall take all steps necessary to amend or
supplement the Schedule 14D-9 and to cause the Schedule 14D-9 as so amended or
supplemented to be filed with the SEC and disseminated to the Company's
stockholders, in each case as and to the extent required by applicable federal
securities laws. The Company shall provide Parent and its counsel with any
comments the Company or its counsel may receive from the SEC or its staff with
respect to the Schedule 14D-9 promptly after the receipt of such comments and
shall consult with Parent, Sub and their counsel prior to responding to any such
comments.

                  (c) In connection with the Offer, the Company shall cause its
transfer agent to furnish Sub promptly with mailing labels containing the names
and addresses of the record holders of Company Common Stock as of a recent date
and of those persons becoming record holders


                                       3
   41


subsequent to such date, together with copies of all lists of stockholders,
security position listings and computer files and all other information in the
Company's possession or control regarding the beneficial owners of Company
Common Stock, and shall furnish to Sub such information and assistance
(including updated lists of stockholders, security position listings and
computer files) as Parent or Sub may reasonably request in communicating the
Offer to the Company's stockholders. Subject to the requirements of applicable
Law, until the Effective Time, Parent and Sub shall use such information only in
connection with the Offer and the Merger and, if this Agreement shall be
terminated in accordance with Section 8.01, shall, upon written request,
deliver, and shall use their reasonable efforts to cause their affiliates,
agents and advisors to deliver, to the Company all copies of such information
then in their possession.

         Section 1.03. The Merger.

         On the terms and subject to the conditions set forth in this Agreement,
and in accordance with the Delaware General Corporation Law (the "DGCL"), Sub
shall be merged with and into the Company at the Effective Time. At the
Effective Time, the separate corporate existence of Sub shall cease and the
Company shall continue as the surviving corporation (as such, the "Surviving
Corporation") and a wholly owned subsidiary of Parent.

         Section 1.04. Closing.

         Unless this Agreement shall have been terminated and the transactions
contemplated hereby shall have been abandoned pursuant to Article VIII, and
subject to the satisfaction or waiver of all of the conditions set forth in
Article VII, the closing (the "Closing") of the Merger shall take place at the
offices of Baker Botts L.L.P., One Shell Plaza, 910 Louisiana Street, Houston,
Texas 77002 at 10:00 a.m. on the second business day following the satisfaction
(or, to the extent permitted by Law, waiver) of the conditions set forth in
Section 7.01 (other than those conditions that by their nature are to be
satisfied at the Closing, but subject to the fulfillment or, to the extent
permitted by Law, waiver of those conditions), or at such other place, time and
date as shall be agreed in writing between Parent and the Company. The date on
which the Closing occurs is referred to in this Agreement as the "Closing Date."

         Section 1.05. Effective Time.

         Prior to the Closing, the Company shall prepare, and on the Closing
Date the Company shall file with the Secretary of State of the State of
Delaware, a certificate of merger (or a certificate of ownership and merger)
(the "Certificate of Merger") executed in accordance with the relevant
provisions of the DGCL and shall make all other filings or recordings required
under the DGCL. The Merger shall become effective at such time as the
Certificate of Merger is duly filed with such Secretary of State or at such
other time as Parent and the Company shall agree and specify in the Certificate
of Merger (the time the Merger becomes effective being the "Effective Time").

         Section 1.06. Effects.

         The Merger shall have the effects set forth in Section 259 of the DGCL.


                                       4
   42


         Section 1.07. Certificate of Incorporation and Bylaws.

                  (a) The Certificate of Incorporation of Sub, as in effect
immediately prior to the Effective Time, shall be amended at the Effective Time
to change the corporate name set forth therein to "Pennaco Energy, Inc." and, as
so amended, shall be the Certificate of Incorporation of the Surviving
Corporation until thereafter changed or amended in accordance with the
provisions thereof and applicable Law.

                  (b) The Bylaws of Sub as in effect immediately prior to the
Effective Time shall be the Bylaws of the Surviving Corporation until thereafter
changed or amended in accordance with the provisions thereof and the provisions
of the Certificate of Incorporation of the Surviving Corporation and applicable
Law.

         Section 1.08. Directors.

         The directors of Sub immediately prior to the Effective Time shall be
the directors of the Surviving Corporation, until the earlier of their
resignation or removal or until their respective successors are duly elected and
qualified, as the case may be.

         Section 1.09. Officers.

         The officers of the Company immediately prior to the Effective Time
shall be the officers of the Surviving Corporation, until the earlier of their
resignation or removal or until their respective successors are duly elected and
qualified, as the case may be.

                                   ARTICLE II

                       EFFECT ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

         Section 2.01. Effect on Capital Stock.

         At the Effective Time, by virtue of the Merger and without any action
on the part of the holder of any shares of Company Common Stock or any shares of
capital stock of Sub:

                  (a) Capital Stock of Sub. Each issued and outstanding share of
capital stock of Sub shall be converted into and become one fully paid and
nonassessable share of common stock, par value $0.001 per share, of the
Surviving Corporation.

                  (b) Cancellation of Treasury Stock and Parent-Owned Stock.
Each share of Company Common Stock issued and outstanding immediately prior to
the Effective Time that is owned by the Company, Parent or Sub shall no longer
be outstanding and shall automatically be canceled and retired and shall cease
to exist, and no cash or other consideration shall be delivered or deliverable
in exchange therefor.


                                       5
   43


                  (c) Conversion of Company Common Stock.

                           (i) Subject to Sections 2.01(b) and 2.01(d), each
         issued and outstanding share of Company Common Stock shall be converted
         into the right to receive an amount in cash equal to the Offer Price,
         without interest, less any required withholding taxes, upon surrender
         and exchange of the Certificate representing such share.

                           (ii) The cash payable upon the conversion of a share
         of Company Common Stock pursuant to this Section 2.01(c) is referred to
         as the "Merger Consideration." As of the Effective Time, all such
         shares of Company Common Stock shall no longer be outstanding and shall
         automatically be canceled and retired and shall cease to exist, and
         each holder of a Certificate representing any such shares of Company
         Common Stock shall cease to have any rights with respect thereto,
         except the right to receive the Merger Consideration, without interest,
         less any required withholding taxes, upon surrender of such Certificate
         in accordance with Section 2.02.

                  (d) Appraisal Rights. Notwithstanding anything in this
Agreement to the contrary, shares ("Dissent Shares") of Company Common Stock
that are outstanding immediately prior to the Effective Time and that are held
by any person who is entitled to dissent from and properly dissents from this
Agreement pursuant to, and who complies in all respects with, Section 262 of the
DGCL, in each case to the extent applicable (the "Appraisal Statute"), shall not
be converted into a right to receive the Merger Consideration as provided in
Section 2.01(c), but rather the holders of Dissent Shares shall be entitled to
the right to receive payment of the appraised value of such Dissent Shares in
accordance with the Appraisal Statute; provided, however, that if any such
holder shall fail to perfect or otherwise shall waive, withdraw or lose the
right to receive payment of the appraised value under the Appraisal Statute,
then the right of such holder to be paid the appraised value of such holder's
Dissent Shares shall cease and such Dissent Shares shall be deemed to have been
converted as of the Effective Time into, and to have become exchangeable solely
for, the right to receive the Merger Consideration, without interest, as
provided in Section 2.01(c). The Company shall give prompt notice to Parent of
any objections or demands received by the Company for appraisal of Company
Common Stock pursuant to the Appraisal Statute, and Parent shall have the right
to direct all negotiations and proceedings with respect to such objections or
demands. Neither the Company nor the Surviving Corporation shall, without the
prior written consent of Parent, make any payment with respect to, or settle or
offer to settle, any such objections or demands, or agree to do any of the
foregoing.

         Section 2.02. Exchange of Certificates.

                  (a) Paying Agent. Prior to the Effective Time, Parent shall
select a bank or trust company reasonably acceptable to the Company to act as
paying agent (the "Paying Agent") for the payment of the Merger Consideration
upon surrender of Certificates. The Surviving Corporation shall, and Parent
shall cause the Surviving Corporation to, provide to the Paying Agent on a
timely basis, as and when needed after the Effective Time, cash necessary to pay
for the shares of Company Common Stock converted into the right to receive the
Merger Consideration pursuant to Section 2.01(c) (such cash being hereinafter
referred to as the "Exchange Fund"). The expenses of the


                                       6
   44


Paying Agent shall not be paid from the Exchange Fund, but shall be paid
directly by the Surviving Corporation.

                  (b) Exchange Procedure. As soon as reasonably practicable
after the Effective Time, Parent shall cause the Paying Agent to mail to each
holder of record of a certificate or certificates (the "Certificates") that
immediately prior to the Effective Time represented outstanding shares of
Company Common Stock whose shares were converted into the right to receive the
Merger Consideration pursuant to Section 2.01(c), (i) a letter of transmittal
(which shall specify that delivery shall be effected, and risk of loss and title
to the Certificates shall pass, only upon delivery of the Certificates to the
Paying Agent and shall be in such form and have such other provisions as Parent
may reasonably specify) and (ii) instructions for use in effecting the surrender
of the Certificates in exchange for the Merger Consideration. Upon surrender of
a Certificate for cancellation to the Paying Agent or to such other agent or
agents as may be appointed by Parent, together with such letter of transmittal,
duly executed, and such other documents as may reasonably be required pursuant
to such instructions, the holder of such Certificate shall be entitled to
receive in exchange therefor cash in an amount equal to the product of (A) the
number of shares of Company Common Stock theretofore represented by such
Certificate and (B) the Merger Consideration, and the Certificate so surrendered
shall forthwith be canceled. In the event of a transfer of ownership of Company
Common Stock that is not registered in the transfer records of the Company,
payment may be made to a person other than the person in whose name the
Certificate so surrendered is registered, if such Certificate shall be properly
endorsed or otherwise be in proper form for transfer and the person requesting
such payment shall pay any transfer or other taxes required by reason of the
payment to a person other than the registered holder of such Certificate or
establish to the satisfaction of Parent that such tax has been paid or is not
applicable. No interest shall be paid or shall accrue on the cash payable upon
surrender of any Certificate.

                  (c) No Further Ownership Rights in Company Common Stock;
Transfer Books. The Merger Consideration paid in accordance with the terms of
this Article II upon conversion of any shares of Company Common Stock shall be
deemed to have been paid in full satisfaction of all rights pertaining to such
shares of Company Common Stock, subject, however, to the Surviving Corporation's
obligation to pay any dividends or make any other distributions with a record
date prior to the Effective Time that may have been declared or made by the
Company on such shares of Company Common Stock in accordance with the terms of
this Agreement and which remain unpaid at the Effective Time, and after the
Effective Time there shall be no further registration of transfers on the stock
transfer books of the Surviving Corporation of shares of Company Common Stock
that were outstanding immediately prior to the Effective Time. If, after the
Effective Time, any Certificates are presented to the Surviving Corporation or
the Paying Agent for any reason, they shall be canceled and exchanged as
provided in this Article II.

                  (d) Termination of Exchange Fund. Any portion of the Exchange
Fund (including any interest or other income received by the Paying Agent in
respect thereof that has not previously been distributed pursuant to Section
2.02(f)) that remains undistributed to the holders of Company Common Stock for
180 days after the Effective Time shall be delivered to the Surviving
Corporation, upon demand, and any holder of Company Common Stock who has not
theretofore complied with this Article II shall thereafter look only to the
Surviving Corporation for payment of such holder's claim for the Merger
Consideration.


                                       7
   45


                  (e) No Liability. None of Parent, Sub, the Company, the
Surviving Corporation or the Paying Agent shall be liable to any person in
respect of any payments or distributions payable from the Exchange Fund
delivered to a public official pursuant to any applicable abandoned property,
escheat or similar Law. If any Certificate has not been surrendered prior to
five years after the Effective Time (or immediately prior to such earlier date
on which the Merger Consideration in respect of such Certificate would otherwise
escheat to or become the property of any Governmental Entity), any amounts
payable in respect of such Certificate shall, to the extent permitted by
applicable Law, become the property of the Surviving Corporation, free and clear
of all claims or interests of any person previously entitled thereto.

                  (f) Investment of Exchange Fund. The Paying Agent shall invest
any cash included in the Exchange Fund, as directed by the Surviving
Corporation, on a daily basis. Any interest and other income resulting from such
investments shall be payable to the Surviving Corporation on demand.

                  (g) Withholding Rights. Parent, Sub or the Surviving
Corporation shall be entitled to deduct and withhold, or cause the Paying Agent
to deduct and withhold, from the consideration otherwise payable to any holder
of Company Common Stock pursuant to this Agreement, whether the Offer Price or
the Merger Consideration, such amounts as may be required to be deducted and
withheld with respect to the making of such payment under the Internal Revenue
Code of 1986, as amended (the "Code"), or under any provision of state, local or
foreign tax Law. To the extent that amounts are so deducted and withheld by
Parent, Sub or the Surviving Corporation, such deducted and withheld amounts
shall be treated for all purposes of this Agreement as having been paid to the
holder of the shares of Company Common Stock in respect of which such deduction
and withholding was made by Parent, Sub or the Surviving Corporation.

                  (h) Lost Certificates. If any Certificate shall have been
lost, stolen or destroyed, upon the making of an affidavit of that fact by the
person claiming such Certificate to be lost, stolen or destroyed and, if
required by the Surviving Corporation, the posting by such person of a bond, in
such reasonable amount as the Surviving Corporation may direct, as indemnity
against any claim that may be made against Parent or the Surviving Corporation
with respect to such Certificate, the Paying Agent will pay, in exchange for
such lost, stolen or destroyed Certificate, the Merger Consideration to be paid
in respect of the shares of Company Common Stock represented by such
Certificate, as contemplated by this Article II.

                                  ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         The Company represents and warrants to Parent and Sub as follows:

         Section 3.01. Organization, Standing and Power.

         The Company is a corporation duly organized, validly existing and in
good standing under the laws of the State of Delaware and has full corporate
power and authority necessary to enable it to own, lease or otherwise hold its
properties and assets and to conduct its business as currently


                                       8
   46


conducted. The Company is duly qualified to do business in each jurisdiction
where (a) the nature of its business or its ownership or leasing of its
properties make such qualification necessary or (b) the failure to so qualify,
individually or in the aggregate, has had or could reasonably be expected to
have a Company Material Adverse Effect. The Company has delivered to Parent
true, correct and complete copies of the certificate of incorporation of the
Company, as amended to the date of this Agreement (as so amended, the "Company
Charter"), and the Bylaws of the Company, as amended to the date of this
Agreement (as so amended, the "Company Bylaws"). The Company Charter and the
Company Bylaws are in full force and effect, and no other organizational
documents are applicable to or binding upon the Company. The Company is not in
violation of any provision of the Company Charter or the Company Bylaws.

         Section 3.02. Subsidiaries; Equity Interests.

         The Company has no subsidiaries and does not own, directly or
indirectly, any capital stock, membership interest, partnership interest, joint
venture interest or other equity or ownership interest in any person.

         Section 3.03. Capital Structure.

                  (a) The authorized capital stock of the Company consists of
50,000,000 shares of Company Common Stock and 10,000,000 shares of preferred
stock, par value $0.001 per share. At the close of business on December 21,
2000, (i) 19,641,286 shares of Company Common Stock were issued and outstanding,
(ii) no shares of Company Common Stock were held by the Company in its treasury,
(iii) 3,931,536 shares of Company Common Stock were subject to issuance upon
exercise of outstanding Company Stock Options under the Company Stock Plan at a
weighted average exercise price of $5.89 per share, (iv) 90,000 shares of
Company Common Stock were subject to issuance upon exercise of outstanding
warrants at a weighted average exercise price of $4.72 per share (the
"Warrants"), (v) 447,772 additional shares of Company Common Stock were reserved
for issuance pursuant to the Company Stock Plan and (vi) one common share
purchase right (a "Company Right") for each share of Common Stock outstanding
was issued and outstanding in accordance with that certain Rights Agreement (the
"Company Rights Agreement"), dated as of February 24, 1999, between the Company
and Harris Trust and Savings Bank, as Rights Agent (the "Rights Agent"), and
one-half of a share of Company Common Stock was reserved for issuance pursuant
to the exercise of each Company Right. Except as set forth above, at the close
of business on the date of this Agreement, no shares of capital stock or other
voting securities of the Company were issued, reserved for issuance or
outstanding. All outstanding shares of Company capital stock are, and all such
shares that may be issued prior to the Effective Time will be when issued, duly
authorized, validly issued, fully paid and nonassessable and not subject to or
issued in violation of any purchase option, call option, right of first refusal,
preemptive right, subscription right or any similar right under any provision of
the DGCL, the Company Charter, the Company Bylaws or any contract, lease,
license, indenture, note, bond, agreement, permit, concession, franchise or
other instrument (a "Contract") to which the Company is a party or otherwise
bound. Except as set forth above, as of the date of this Agreement, there are
not any options, warrants, calls, rights, convertible or exchangeable
securities, units, commitments, Contracts, arrangements or undertakings to which
the Company is a party or by which it is bound (x) obligating the Company to
issue, deliver or sell, or cause to be issued, delivered or sold, additional
shares of capital stock or other equity interests in,


                                       9
   47


or any security convertible or exercisable for or exchangeable into any capital
stock of or other equity interest in, the Company or (y) obligating the Company
to issue, grant, extend or enter into any such option, warrant, call, right,
security, unit, commitment, Contract, arrangement or undertaking. As of the date
of this Agreement, there are not any outstanding contractual obligations of the
Company to repurchase, redeem or otherwise acquire any shares of capital stock
of the Company. Except as contemplated in connection with the execution of this
Agreement, there are no shareholder agreements, voting trusts or other
agreements or understandings to which the Company is a party or to which it is
bound relating to the holding, voting or disposition of any shares of capital
stock of the Company.

                  (b) The Company Board or a committee administering the Company
Stock Plan has the power and authority to adjust the terms of all outstanding
Company Stock Options granted under the Company Stock Plan, by resolution or
other action, to provide that each such Company Stock Option outstanding
immediately prior to the acceptance for payment of shares of Company Common
Stock pursuant to the Offer shall be canceled in accordance with Section 6.04,
with the holder thereof becoming entitled to receive the amount of cash referred
to in Section 6.04. Such cancellation of a Company Stock Option in exchange for
the cash payment described in Section 6.04 will constitute a release of any and
all rights the holder of such Company Stock Option had or may have had in
respect thereof. No consents of the holders of the Company Stock Options are
necessary to effectuate the foregoing. The Company Board or a committee
administering the Company Stock Plan has the power and authority to cause (i)
the Company Stock Plan to terminate as of the Effective Time and (ii) the
provisions in any other Company Benefit Plan providing for the issuance,
transfer or grant of any capital stock of the Company or any interest in respect
of any capital stock of the Company to be deleted as of the Effective Time.
Following the Effective Time, no holder of a Company Stock Option or any
participant in the Company Stock Plan or other Company Benefit Plan will have
any right thereunder to acquire any capital stock of the Company or the
Surviving Corporation.

         Section 3.04. Authority; Execution and Delivery; Enforceability.

                  (a) The Company has all requisite corporate power and
authority to execute, deliver and perform this Agreement and to consummate the
Transactions. The execution, delivery and performance by the Company of this
Agreement and the consummation by the Company of the Transactions have been duly
authorized by all necessary corporate and stockholder action on the part of the
Company, subject, in the case of the Merger, to receipt of the Company
Stockholder Approval required by applicable Law. The Company has duly executed
and delivered this Agreement, and this Agreement constitutes its legal, valid
and binding obligation, enforceable against the Company in accordance with its
terms, except as that enforceability may be limited by any applicable
bankruptcy, insolvency, reorganization, moratorium or similar Laws affecting the
enforcement of creditor's rights generally and the application of general
principles of equity (regardless of whether that enforceability is considered in
a proceeding at law or in equity). Subject to the applicability of Section 253
of the DGCL, the affirmative vote of the holders of a majority of the
outstanding shares of Company Common Stock voting as a single class (the
"Company Stockholder Approval") is the only vote of any class or series of the
Company's capital stock required to approve the Merger and adopt this Agreement.


                                       10
   48


                  (b) The Company Board has duly adopted resolutions, in each
case by a unanimous vote of all members of the Company Board, (i) approving and
declaring the advisability of this Agreement, the Offer, the Merger and the
other Transactions in accordance with the applicable provisions of the DGCL,
(ii) determining that the terms of the Offer, the Merger and the other
Transactions are fair to and in the best interests of the Company and its
stockholders and (iii) recommending that the holders of Company Common Stock
accept the Offer, tender their shares of Company Common Stock pursuant to the
Offer and, if approval is required by applicable Law, approve and adopt this
Agreement and the Merger. Such resolutions are sufficient to render inapplicable
to Parent, Sub and USX Corporation, a Delaware corporation of which Parent is a
wholly owned subsidiary ("USX"), and this Agreement, the Offer, the Merger and
the other Transactions the provisions of Section 203 of the DGCL. No other state
takeover statute or similar statute or regulation applies or purports to apply
to the Company with respect to this Agreement, the Offer, the Merger or any
other Transaction.

         Section 3.05. No Conflicts; Consents.

                  (a) Except as set forth in Section 3.05(a) of the letter dated
as of the date of this Agreement from the Company to Parent and Sub (the
"Company Disclosure Letter"), the execution, delivery and performance by the
Company of this Agreement do not, and the consummation of the Offer, the Merger
and the other Transactions and compliance with the terms of this Agreement will
not, (i) conflict with or result in any violation of any provision of the
Company Charter or the Company Bylaws, (ii) subject to the filings and other
matters referred to in Section 3.05(b), conflict with, or result in any
violation of or default (with or without notice or lapse of time, or both)
under, or give rise to a right of termination, cancellation or acceleration of
any obligation or to loss of a material benefit under, or to increased,
additional, accelerated or guaranteed rights or entitlements of any person
under, or result in the creation of any pledge, lien, charge, mortgage,
encumbrance or security interest of any kind or nature whatsoever (collectively,
"Liens") upon any of the properties or assets of the Company under, or require
the consent of any person under, any provision of any Contract to which the
Company is a party or by which any of its properties or assets is bound or
affected or (iii) subject to the filings and other matters referred to in
Section 3.05(b), conflict with or result in any violation of any domestic or
foreign judgment, verdict, jury award, injunction, order or decree ("Judgment")
or domestic or foreign statute, law (including common law), ordinance, rule or
regulation ("Law") applicable to the Company or its properties or assets, except
in the case of clauses (ii) and (iii) above, for such matters as, individually
or in the aggregate, could not reasonably be expected to have a Company Material
Adverse Effect.

                  (b) No consent, approval, license, permit, order or
authorization ("Consent") of, or registration, declaration or filing with, or
notice to, or Permit from, any federal, state, local or foreign government or
any court of competent jurisdiction, administrative agency or commission or
other governmental authority or instrumentality, domestic or foreign (a
"Governmental Entity") is required to be obtained or made by or with respect to
the Company in connection with the execution, delivery and performance of this
Agreement or the consummation of the Transactions, other than (i) the filing
with the SEC of (A) the Schedule 14D-9, (B) a proxy or information statement
relating to the Company Stockholder Approval (the "Proxy Statement"), if such
approval is required by applicable Law, and (C) such reports under Section 13 of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as may be
required in connection with this Agreement, the Offer,


                                       11
   49


the Merger and the other Transactions, (ii) the filing of the Certificate of
Merger with the Secretary of State of the State of Delaware and appropriate
documents with the relevant authorities of the other jurisdictions in which the
Company is qualified to do business, (iii) such filings as may be required in
connection with the Taxes described in Section 6.08, (iv) filings under state
securities Laws, and (v) such other items as, individually or in the aggregate,
could not reasonably be expected to have a Company Material Adverse Effect.

                  (c) The Company Board, by a unanimous vote of all its members,
has taken all action necessary, subject only to obtaining the countersignature
of the Rights Agent to an amendment to the Company Rights Agreement (which
countersignature the Company will have obtained prior to the commencement of the
Offer), to (i) render the Company Rights inapplicable to this Agreement, the
Offer, the Merger and the other Transactions, (ii) ensure that (A) neither
Parent nor Sub nor any of its "Affiliates" or "Associates" is or will become an
"Acquiring Person" (each as defined in the Company Rights Agreement) by reason
of this Agreement, the Offer, the Merger or any other Transaction, and (B) a
"Distribution Date" (as defined in the Company Rights Agreement) will not occur
by reason of this Agreement, the Offer, the Merger or any of the other
Transactions and (iii) cause the Company Rights to expire concurrently with the
consummation of the Offer.

         Section 3.06. SEC Documents; Undisclosed Liabilities.

                  (a) The Company has timely filed all required reports,
schedules, forms, statements and other documents with the SEC relating to
periods commencing on or after September 1, 1998 (such reports, schedules,
forms, statements and other documents being hereinafter referred to as the
"Company SEC Documents"). As of their respective dates, the Company SEC
Documents complied in all material respects with the requirements of the
Exchange Act or the Securities Act of 1933, as amended (the "Securities Act"),
as the case may be, and the rules and regulations of the SEC promulgated
thereunder applicable to such Company SEC Documents, and none of the Company SEC
Documents as of such dates contained any untrue statement of a material fact or
omitted to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading. The consolidated financial statements of the
Company included in the Company SEC Documents comply as to form in all material
respects with applicable accounting requirements and the published rules and
regulations of the SEC with respect thereto, have been prepared in accordance
with generally accepted accounting principles in the United States ("GAAP")
(except, in the case of unaudited quarterly statements, as permitted by Form
10-Q of the SEC) applied on a consistent basis during the periods involved
(except as may otherwise be indicated in the notes thereto) and fairly present
in all material respects the financial position of the Company as of the dates
thereof and the results of its operations and cash flows for the periods then
ended (subject, in the case of unaudited quarterly statements, to normal
year-end audit adjustments).

                  (b) Except as set forth in the most recent financial
statements included in the Filed Company SEC Documents, the Company has no
liabilities or obligations of any nature (whether accrued, absolute, contingent
or otherwise) which would be required to be reflected in the Company's financial
statements, and there is no existing condition, situation or set of
circumstances that could reasonably be expected to result in such a liability or
obligation (including any claims,


                                       12
   50


whether or not asserted, for royalty payments), that, individually or in the
aggregate, could reasonably be expected to have a Company Material Adverse
Effect.

         Section 3.07. Information Supplied.

         Subject to Parent's and Sub's fulfillment of their obligations with
respect thereto, the Schedule 14D-9 and the Proxy Statement will contain (or
will be amended in a timely manner so as to contain) all information which is
required to be included therein in accordance with the Exchange Act and the
rules and regulations thereunder and any other applicable Law and will conform
in all material respects with the requirements of the Exchange Act and any other
applicable Law; and neither the Schedule 14D-9 nor the Proxy Statement (or any
amendment or supplement thereto) will, at the respective times they are filed
with the SEC or published, sent or given to the Company's stockholders, contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not misleading
or, in the case of the Proxy Statement, will, at the time of the Company
Stockholders Meeting, omit to state any material fact necessary to correct any
statement in any earlier communication with respect to the solicitation of
proxies for the Company Stockholders Meeting which shall have become false or
misleading in any material respect. Notwithstanding the foregoing, no
representation or warranty is hereby made by the Company with respect to any
information supplied by USX, Parent or Sub in writing for inclusion in, or with
respect to USX, Parent or Sub information derived from USX's public SEC filings
which is included or incorporated by reference in, the Schedule 14D-9 or the
Proxy Statement. None of the information supplied or to be supplied by the
Company in writing for inclusion or incorporation by reference in, or which may
be deemed to be incorporated by reference in, any of the Offer Documents will,
at the respective times the Offer Documents are filed with the SEC or published,
sent or given to the Company's stockholders, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances under
which they are made, not misleading. If at any time prior to the Effective Time
any event with respect to the Company, or with respect to any information
supplied by the Company in writing for inclusion in any of the Offer Documents,
shall occur which is required to be described in an amendment of, or a
supplement to, any of the Offer Documents, the Company shall so describe the
event to Parent.

         Section 3.08. Absence of Certain Changes or Events.

         Except as disclosed in the Company SEC Documents filed and publicly
available prior to the date of this Agreement (the "Filed Company SEC
Documents") or in Section 3.08 of the Company Disclosure Letter, since December
31, 1999, the Company has conducted its business only in the ordinary course of
business, and there has not been:

                  (a) any event, change, occurrence, effect or development that,
individually or in the aggregate, has had or could reasonably be expected to
have a Company Material Adverse Effect;

                  (b) any declaration, setting aside or payment of any dividend
or other distribution (whether in cash, stock, property or otherwise) with
respect to any Company capital stock or any


                                       13
   51


repurchase, redemption or other acquisition by the Company of any capital stock
or other equity securities of, or other ownership interests in, the Company;

                  (c) any split, combination or reclassification of any Company
capital stock or any issuance of or the authorization of any issuance of any
other securities in respect of, in lieu of or in substitution for, shares of
Company capital stock;

                  (d) (i) any grant by the Company to any director or officer of
the Company of any increase in compensation, bonus or other benefits, (ii) any
grant by the Company to any such director or officer of any increase in
severance, change of control or termination pay benefits, or (iii) any entry by
the Company into, or any amendment of, any employment, consulting, deferred
compensation, indemnification, severance, change of control or termination
agreement or arrangement with any such director or officer;

                  (e) any change in accounting methods, principles or practices
by the Company, except for such changes as may have been required by a change in
GAAP;

                  (f) any (i) material elections with respect to Taxes by the
Company, (ii) settlement or compromise by the Company of any material Tax
liability or refund or (iii) assessment of a material Tax or Royalty against the
Company by any Governmental Entity;

                  (g) any amendment of any term of any outstanding security of
the Company that would materially increase the obligations of the Company under
such security;

                  (h) any incurrence, assumption or guarantee by the Company of
any indebtedness for borrowed money;

                  (i) any creation or assumption by the Company of any Lien on
any asset of the Company;

                  (j) any making of any loan, advance or capital contribution to
or investment in any person by the Company other than (i) in connection with any
acquisition or capital expenditure permitted by Section 5.01, or (ii) loans or
advances to employees of the Company made in the ordinary course of business;

                  (k) (i) any acquisition by the Company by merging or
consolidating with, or by purchasing a substantial equity interest in or a
substantial portion of the assets of, or by any other manner, any business or
any corporation, partnership, joint venture, association or other business
organization or division thereof or any acquisition by the Company of any assets
(other than inventory) that are material to the Company, (ii) any sale, lease,
license, encumbrance or other disposition of material assets of the Company,
other than sales of products to customers in the ordinary course of business,
(iii) any incurrence of capital expenditures by the Company other than in the
ordinary course of business, or (iv) any modification, amendment, assignment,
termination or relinquishment by the Company of any Contract, license or other
right that, individually or in the aggregate with all such modifications,
amendments, assignments, terminations and relinquishments, has had or could
reasonably be expected to have a Company Material Adverse Effect;


                                       14
   52


                  (l) any damage, destruction or loss (whether or not covered by
insurance) with respect to any assets of the Company that, individually or in
the aggregate, has had or could reasonably be expected to have a Company
Material Adverse Effect;

                  (m) any entry by the Company into any commitment or
transaction material to the Company (other than commitments or transactions
entered into in the ordinary course of business);

                  (n) as of the date hereof, any revaluation by the Company of
any of its material assets, including but not limited to writing down the value
of inventory or writing off notes or accounts receivable other than in the
ordinary course of business; or

                  (o) any agreement, commitment or undertaking to take any
action referred to in Sections 3.08(a) through 3.08(n).

         Section 3.09. Taxes.

                  (a) The Company has timely filed, or has caused to be timely
filed on its behalf, all Tax Returns (including those returns requiring
estimates of Tax payments) required to be filed by it, and all such Tax Returns
are true, complete and accurate in all material respects. The Tax Returns have
been prepared in accordance with all applicable Laws. All Taxes shown to be due
on such Tax Returns, or otherwise owed, have been timely paid. Section 3.09(a)
of the Company Disclosure Letter contains a list of all jurisdictions (whether
foreign or domestic) in which the Company currently files Tax Returns.

                  (b) Except as set forth in Section 3.09(b) of the Company
Disclosure Letter, (i) the Company has not requested any extension of time in
which to file any Tax Return, which Tax Return has not since been filed, and
(ii) no audits, investigations or other proceedings by a Governmental Entity are
presently pending against the Company that could materially affect the liability
of the Company for Taxes, and no notification has been received by the Company
that any such audit, investigation or proceeding is threatened. Section 3.09(b)
of the Company Disclosure Letter includes a list of all issues in dispute in any
audit, investigation or proceeding against the Company and an estimate of the
amount of Tax in dispute as to each issue.

                  (c) The most recent financial statements contained in the
Filed Company SEC Documents reflect an adequate reserve for all Taxes payable by
the Company for all Taxable periods and portions thereof through the date of
such financial statements. No material deficiency with respect to any Taxes has
been threatened, proposed, asserted or assessed against the Company, and no
waivers or extensions of the statute of limitations with respect to any Taxes
are pending.

                  (d) There are no material Liens for Taxes (other than for
current Taxes not yet due and payable) on the assets of the Company. The Company
is not bound by any agreement with respect to Taxes.

                  (e) The Company has never been a member of an affiliated,
consolidated, combined or unitary group and has no liability for the payment of
Taxes of any other entity as a result of being a member of such a group or as a
result of any express or implied obligation to indemnify any other person with
respect to the payment of any Taxes.


                                       15
   53


                  (f) The Company has timely filed, or has caused to be timely
filed on its behalf, all Royalty Returns required to be filed by it, and all
such Royalty Returns are true, complete and accurate in all material respects as
provided for under contract or by statute. All Royalties shown to be due on such
Royalty Returns, or otherwise owed, have been timely paid. Section 3.09(f) of
the Company Disclosure Letter contains a list of all jurisdictions in which the
Company currently files Royalty Returns, a list of all scheduled royalty audits
or planned audits by the relevant authorities, and a list of disputed matters as
described above along with an estimated dollar amount attributable to the
disputed matter. No material deficiency with respect to any Royalty has been
threatened, proposed, asserted or assessed against the Company.

                  (g) For purposes of this Agreement:

         "Royalty" includes any payments required under any contractual
arrangement or by any applicable statute attributable to the production of
natural resources whether owed to a local, state or federal Governmental Entity
and shall include all interest, penalties and additions imposed with respect to
such amounts.

         "Royalty Return" means any federal, state, or local Royalty return,
declaration, statement, report, schedule, form or information return or any
amended Royalty return relating to Royalties.

         "Taxes" includes all forms of taxation, whenever created or imposed,
and whether of the United States or elsewhere, and whether imposed by a local,
municipal, governmental, state, foreign, federal or other Governmental Entity,
or in connection with any agreement with respect to Taxes, including all
interest, penalties and additions imposed with respect to such amounts.

         "Tax Return" means any federal, state, local, provincial or foreign Tax
return, declaration, statement, report, schedule, form or information return or
any amended Tax return relating to Taxes.

         Section 3.10. Absence of Changes in Benefit Plans.

         Except as disclosed in the Filed Company SEC Documents or in Section
3.10 of the Company Disclosure Letter, since December 31, 1999, there has not
been any adoption or amendment in any material respect by the Company of any
collective bargaining agreement or any bonus, pension, profit sharing, deferred
compensation, incentive compensation, stock ownership, stock purchase, stock
option, phantom stock, retirement, thrift, savings, stock bonus, restricted
stock, cafeteria, severance, disability, medical or other plan, providing
benefits to any current or former employee, officer or director of the Company
(collectively, "Company Benefit Plans"). Except as disclosed in the Filed
Company SEC Documents or in Section 3.10 of the Company Disclosure Letter, there
are not any employment, consulting, deferred compensation, indemnification,
severance or termination agreements or arrangements, non-compete agreements,
confidentiality agreements, nonsolicitation and business diversion agreements or
tax gross-up agreements between the Company and any current or former employee,
officer or director of the Company (collectively, "Company Benefit Agreements").


                                       16
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         Section 3.11. ERISA Compliance; Excess Parachute Payments.

                  (a) Section 3.11(a) of the Company Disclosure Letter contains
a list and brief description of all "employee pension benefit plans" (as defined
in Section 3(2) of the Employee Retirement Income Security Act of 1974, as
amended ("ERISA")) (sometimes referred to herein as "Company Pension Plans"),
"employee welfare benefit plans" (as defined in Section 3(1) of ERISA) and all
other Company Benefit Plans and Company Benefit Agreements maintained, or
contributed to, by the Company or to which the Company is a party, for the
benefit of any current or former employees, officers or directors of the
Company. The Company has made available to Parent true, complete and correct
copies of (i) each Company Benefit Plan and Company Benefit Agreement (or, in
the case of any unwritten Company Benefit Plan or Company Benefit Agreement, a
description thereof), (ii) the most recent annual report on Form 5500 filed with
the Internal Revenue Service with respect to each Company Benefit Plan (if any
such report was required), (iii) the most recent summary plan description for
each Company Benefit Plan for which such summary plan description is required,
(iv) each trust agreement and group annuity contract relating to any Company
Benefit Plan and (v) each employment agreement to which the Company is a party
or is bound.

                  (b) All Company Pension Plans have received favorable
determination letters from the Internal Revenue Service with respect to "TRA"
(as defined in Section 1 of Rev. Proc. 93-39), to the effect that such Company
Pension Plans are qualified and exempt from federal income taxes under Sections
401(a) and 501(a), respectively, of the Code, and no such determination letter
has been revoked nor, to the knowledge of the Company, has revocation been
threatened, nor has any such Company Pension Plan been amended since the date of
its most recent determination letter or application therefor in any respect that
would materially adversely affect its qualification or materially increase its
costs. There is no material pending or, to the knowledge of the Company,
threatened litigation relating to the Company Benefit Plans.

                  (c) No Company Pension Plan, other than any Company Pension
Plan that is a "multiemployer plan" within the meaning of Section 4001(a)(3) of
ERISA (a "Company Multiemployer Pension Plan"), had, as of the respective last
annual valuation date for each such Company Pension Plan, any "unfunded benefit
liabilities" (as such term is defined in Section 4001(a)(18) of ERISA), based on
actuarial assumptions that have been furnished to Parent, and there has been no
material adverse change in the financial condition of any Company Pension Plan
since its last such annual valuation date. No liability under Subtitle C or D of
Title IV of ERISA has been or is expected to be incurred by the Company with
respect to any ongoing, frozen or terminated "single-employer plan," within the
meaning of Section 4001(a)(15) of ERISA, currently or formerly maintained by it,
or the single-employer plan of any entity which is considered one employer with
the Company under Section 4001 of ERISA or Section 414 of the Code (an "ERISA
Affiliate"). None of the Company, any officer of the Company or any of the
Company Benefit Plans which are subject to ERISA, including the Company Pension
Plans, any trusts created thereunder or any trustee or administrator thereof,
has engaged in a "prohibited transaction" (as such term is defined in Section
406 of ERISA or Section 4975 of the Code) or any other breach of fiduciary
responsibility that could subject the Company or any officer of the Company to
the tax or penalty on prohibited transactions imposed by such Section 4975 or to
any liability under Section 502(i) or 502(l) of ERISA. None of such Company
Benefit Plans and trusts has been terminated, nor has there been any "reportable
event" (as that term is defined in Section 4043 of


                                       17
   55


ERISA) for which the 30-day reporting requirement has not been waived with
respect to any Company Benefit Plan during the last five years, and no notice of
a reportable event will be required to be filed in connection with the
Transactions. The Company has not incurred a "complete withdrawal" or a "partial
withdrawal" (as such terms are defined in Sections 4203 and 4205, respectively,
of ERISA) since the effective date of such Sections 4203 and 4205 with respect
to any Company Multiemployer Pension Plan. All contributions and premiums
required to be made under the terms of any Company Benefit Plan as of the date
hereof have been timely made or have been reflected on the most recent balance
sheet filed or incorporated by reference in the Filed Company SEC Documents.
Neither any Company Pension Plan nor any single-employer plan of an ERISA
Affiliate has an "accumulated funding deficiency" (as such term is defined in
Section 302 of ERISA or Section 412 of the Code), whether or not waived.

                  (d) With respect to any Company Benefit Plan that is an
employee welfare benefit plan, (i) no such Company Benefit Plan is unfunded or
funded through a "welfare benefit fund" (as such term is defined in Section
419(e) of the Code), (ii) each such Company Benefit Plan that is a "group health
plan" (as such term is defined in Section 5000(b)(1) of the Code) complies with
the applicable requirements of Section 4980B(f) of the Code and (iii) each such
Company Benefit Plan (including any such Company Benefit Plan covering retirees
or other former employees) may be amended or terminated without material
liability to the Company on or at any time after the Effective Time. The Company
has no obligations for retiree health and life benefits under any Company
Benefit Plan or Company Benefit Agreement.

                  (e) Except as disclosed in Section 3.11(e) of the Company
Disclosure Letter, the consummation of the Offer, the Merger or any other
Transaction will not (x) entitle any employee, officer or director of the
Company to severance pay or an election to terminate and receive severance pay,
(y) accelerate the time of payment or vesting or trigger any payment or funding
(through a grantor trust or otherwise) of compensation or benefits under,
increase the amount payable or trigger any other material obligation pursuant
to, any of the Company Benefit Plans or Company Benefit Agreements or (z) result
in any breach or violation of, or a default under, any of the Company Benefit
Plans or Company Benefit Agreements.

                  (f) Other than payments that may be made to the persons listed
in Section 3.11(f) of the Company Disclosure Letter (the "Primary Company
Executives"), (i) any amount or economic benefit that could be received (whether
in cash or property or the vesting of property) under any Company Benefit Plan
or Company Benefit Agreement or otherwise as a result of the Offer, the Merger,
any Transaction or any other event (including upon, as a result of or in
connection with a termination of employment on or following the Effective Time)
by any employee, officer or director of the Company or any of its affiliates who
is a "disqualified individual" (as such term is defined in proposed Treasury
Regulation Section 1.280G-1) would not be characterized as an "excess parachute
payment" (as defined in Section 280G(b)(1) of the Code), and (ii) no
disqualified individual is entitled to receive any additional payment from the
Company or any other person in the event that the excise tax under Section 4999
of the Code is imposed on such disqualified individual.


                                       18
   56


         Section 3.12. Litigation.

         There is no suit, action, proceeding or investigation pending against,
or to the knowledge of the Company threatened against or affecting, the Company
or any of its properties before any arbitrator, court or other Governmental
Entity (and the Company is not aware of any basis for any such suit, action,
proceeding or investigation) that, individually or in the aggregate, could
reasonably be expected to have a Company Material Adverse Effect. As of the date
hereof, there are no suits, claims, actions, proceedings or investigations
pending or, to the knowledge of the Company, threatened, seeking to prevent,
hinder, modify or challenge the transactions contemplated by this Agreement. The
Company is not subject to any outstanding Judgment against the Company or naming
the Company as a party that, individually or in the aggregate, could reasonably
be expected to have a Company Material Adverse Effect.

         Section 3.13. Compliance with Applicable Laws.

                  (a) Except as disclosed in the Filed Company SEC Documents,
the Company is, and its operations are being conducted, in compliance with all
applicable Laws, except for such failures to comply as, individually or in the
aggregate, could not reasonably be expected to have a Company Material Adverse
Effect. Except as set forth in the Filed Company SEC Documents, the Company has
not received any written notice: (i) of any administrative, civil or criminal
investigation or audit (other than Tax audits) by any Governmental Entity
relating to the Company or (ii) during the past two years, from any Governmental
Entity alleging that the Company is not in compliance in any material respect
with any applicable Law.

                  (b) The Company has in effect all approvals, authorizations,
certificates, filings, franchises, licenses, notices, permits and rights of or
with all Governmental Entities ("Permits") necessary for it to own, lease or
otherwise hold and to operate its properties and assets and to carry on its
business and operations as now conducted, except for the failure to have such
Permits that, individually or in the aggregate, has not had and could not
reasonably be expected to have a Company Material Adverse Effect. There have
occurred no defaults under, or violations of, any such Permit, except for such
defaults and violations that, individually and in the aggregate, have not had
and could not reasonably be expected to have a Company Material Adverse Effect.
Neither the Offer nor the Merger, in and of itself, would cause the revocation
or cancellation of any such Permit that, individually or in the aggregate, could
reasonably be expected to have a Company Material Adverse Effect.

                  (c) This Section 3.13 does not relate to matters with respect
to Taxes, which are the subject of Section 3.09, or to environmental matters,
which are the subject of Section 3.14.

         Section 3.14. Environmental Matters.

                  (a) Except as disclosed in the Filed Company SEC Documents or
in Section 3.14(a) of the Company Disclosure Letter and except for such matters
as, individually or in the aggregate, have not had and could not reasonably be
expected to have a Company Material Adverse Effect, (i) the Company is, and
within the period of all applicable statutes of limitation has been, in
compliance with all applicable Environmental Laws, (ii) the Company holds and
is, and


                                       19
   57


within the period of all applicable statutes of limitation has been, in
compliance with all Permits required to conduct its business and operations
under all applicable Environmental Laws, (iii) the Company has not received any
Environmental Claim against it, and the Company has no knowledge of any such
Environmental Claim being threatened, (iv) to the knowledge of the Company, no
Hazardous Substance or other conditions are present on any property owned,
leased or operated by the Company, or at any other location, that are reasonably
likely to form the basis of any Environmental Claim against the Company or
against any person (including any predecessor of the Company) whose liability
the Company retained or assumed either contractually or by operation of law, (v)
the Company has not entered into or agreed to any Governmental Entity decree,
order or agreement and is not subject to any judgment relating to compliance
with, or to investigation or cleanup, or to liability, under any Environmental
Law, and (vi) the Company has not treated, stored, disposed of, arranged for or
permitted the disposal of, transported, handled, or released any Hazardous
Substance, or owned or operated any property or facility in a manner that has
given or would reasonably be expected to give rise to any liability, including
any liability for response costs, corrective action costs, personal injury,
property damage, natural resources damages or attorney fees, pursuant to any
Environmental Laws. "Environmental Claim" means any claim, demand, action, suit,
complaint, proceeding, directive, investigation, Lien, demand letter or notice
(written or oral) of noncompliance, violation or liability by any person
asserting liability or potential liability (including liability or potential
liability for enforcement, investigatory costs, cleanup costs, governmental
response costs, natural resource damages, property damage, personal injury,
fines or penalties) arising out of, based on or resulting from (i) the presence,
discharge, emission, release or threatened release of any Hazardous Substance at
any location, (ii) circumstances forming the basis of any violation or alleged
violation of any Environmental Law or any Permit issued under any Environmental
Law, or (iii) otherwise relating to obligations or liabilities under any
Environmental Law. "Environmental Laws" means any and all applicable federal,
state or local statutes, regulations, ordinances, guidelines, codes, decrees, or
other legally enforceable requirement (including common law) of any foreign
government, the United States, or any state, local, municipal or other
Governmental Entity, regulating, relating to or imposing liability or standards
of conduct concerning protection of the environment (including indoor air,
ambient air, surface water, groundwater, land surface, subsurface strata, or
plant or animal species) or human health as affected by the environment or
Hazardous Substances (including employee health and safety). "Hazardous
Substance" means all explosive or radioactive substances, materials or wastes,
hazardous or toxic substances, materials or wastes, asbestos,
asbestos-containing materials, pollutants and contaminants (including petroleum
or any fraction thereof) and all other substances, materials or wastes, whether
or not defined as such, that are regulated pursuant to or that could result in
liability under any applicable Environmental Law.

                  (b) No Environmental Law imposes any obligation upon the
Company arising out of or as a condition to the Offer, the Merger or any other
Transaction, including any requirement to modify or to transfer any permit or
license, any requirement to file any notice or other submission with any
Governmental Entity, the placement of any notice, acknowledgment or covenant in
any land records, or the modification of or provision of notice under any
agreement, consent order or consent decree, except for such obligations as,
individually or in the aggregate, could not reasonably be expected to have a
Company Material Adverse Effect. No material Lien has been placed upon any of
the Company's properties under any Environmental Law.


                                       20
   58


         Section 3.15. Contracts.

         Except as disclosed as an exhibit to the Filed Company SEC Documents or
as set forth in Section 3.15 of the Company Disclosure Letter, the Company is
not a party to or bound by or otherwise subject to any Contracts of the
following nature (collectively, the "Material Contracts"): (i) any Contract
which restricts the Company or any of its affiliates from competing in any line
of business or with any person in any geographical area; (ii) any Contract
involving (A) the acquisition, merger or purchase of all or substantially all
the assets or business of a third party involving aggregate consideration of
$10.0 million, (B) the purchase or sale of assets, or a series of purchases and
sales of assets, involving aggregate consideration of $10.0 million or more or
(C) the grant to any person of any preferential right to purchase any material
asset or assets of the Company; (iii) any Contract which contains a "change in
control" or similar provision pursuant to which the execution and delivery of
this Agreement, the commencement of the Offer or the consummation of the Offer,
the Merger or any of the other Transactions would give rise to any right
(including any right of termination, cancellation, acceleration or vesting) or
benefit that could reasonably be expected to have a Company Material Adverse
Effect; (iv) any Contract, including any mortgage or other grant of security
interests, guarantee or note, relating to the borrowing of money in an amount in
excess of $10.0 million in the aggregate; (v) any Contract to indemnify for any
Environmental Claim or any other liability or cost with respect to any
Environmental Law; (vi) any Contract which would prohibit or materially delay
the consummation of the Merger or any of the other Transactions; or (vii) any
other Contract that is material to the business, assets, condition (financial or
otherwise), prospects or results of operations of the Company. Except as,
individually or in the aggregate, could not reasonably be expected to have a
Company Material Adverse Effect, the Company is not in breach or default under
any Material Contract nor, to the knowledge of the Company, is any other party
to any Material Contract in breach or default thereunder.

         Section 3.16. Labor Matters.

         There are no collective bargaining or other labor union agreements to
which the Company is a party or by which it is bound. To the knowledge of the
Company, there have been no labor union organizing activities involving the
Company, and the Company has not had any actual or threatened employee strike,
work stoppage, slowdown or lockout.

         Section 3.17. Brokers; Fees and Expenses.

         No broker, investment banker, financial advisor or other person, other
than Lehman Brothers Inc., the fees and expenses of which will be paid by the
Company, is entitled to any broker's, finder's, financial advisor's or other
similar fee or commission in connection with the Offer, the Merger and the other
Transactions based upon arrangements made by or on behalf of the Company. The
Company has furnished to Parent a true and complete copy of all agreements
between the Company and Lehman Brothers Inc. relating to the Offer, the Merger
and the other Transactions.


                                       21
   59


         Section 3.18. Opinion of Financial Advisor.

         The Company has received the opinion of Lehman Brothers Inc., dated the
date of this Agreement, to the effect that, as of such date, the consideration
to be received in the Offer and the Merger by the holders of Company Common
Stock is fair to the holders of Company Common Stock from a financial point of
view.

         Section 3.19. Potential Conflicts of Interest.

         Except as disclosed in the Filed Company SEC Documents or set forth in
Section 3.19 of the Company Disclosure Letter, there have been no transactions,
agreements, arrangements or understandings between the Company, on the one hand,
and its affiliates, on the other hand, that would be required to be disclosed
under Item 404 of Regulation S-K under the Securities Act.

         Section 3.20. Reserve Information.

         The underlying factual information provided to Ryder Scott Company,
L.P. ("Ryder Scott"), to the extent that it was relied upon by Ryder Scott in
the preparation of its report on the Company's proved reserves as of January 1,
2000, was, at the time of delivery, true and correct in all material respects,
except for such errors as, individually or in the aggregate, could not
reasonably be expected to have a Company Material Adverse Effect. The Company
has no present knowledge of any material errors in such underlying factual
information supplied to Ryder Scott for purposes of preparing such report and
the conclusions in such report are not in any material way unreasonable when
compared with the Company's own evaluation of the properties included in such
report as of January 1, 2000 taken as a whole.

                                   ARTICLE IV

                REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB

         Parent and Sub, jointly and severally, represent and warrant to the
Company as follows:

         Section 4.01. Organization, Standing and Power.

         Each of Parent and Sub is a corporation duly organized, validly
existing and in good standing under the laws of the jurisdiction in which it is
organized and has full corporate power and authority necessary to enable it to
own, lease or otherwise hold its properties and assets and to conduct its
businesses as presently conducted.

         Section 4.02. Sub.

         Since the date of its incorporation, Sub has not carried on any
business or conducted any operations other than the execution of this Agreement,
the performance of its obligations hereunder and matters ancillary thereto. Sub
is a wholly owned subsidiary of Parent.


                                       22
   60


         Section 4.03. Authority; Execution and Delivery; Enforceability.

         Each of Parent and Sub has all requisite corporate power and authority
to execute, deliver and perform this Agreement and to consummate the
Transactions. The execution, delivery and performance by each of Parent and Sub
of this Agreement and the consummation by it of the Transactions have been duly
authorized by all necessary corporate and stockholder action on the part of
Parent and Sub. USX has recommended that Parent enter into this Agreement.
Parent, as sole stockholder of Sub, has adopted this Agreement. Each of Parent
and Sub has duly executed and delivered this Agreement, and this Agreement
constitutes its legal, valid and binding obligations, enforceable against it in
accordance with its terms, except as that enforceability may be limited by any
applicable bankruptcy, insolvency, reorganization, moratorium or similar Laws
affecting the enforcement of creditor's rights generally and the application of
general principles of equity (regardless of whether that enforceability is
considered in a proceeding at law or in equity). Subject to the applicability of
Section 253 of the DGCL, the affirmative vote of the holders of a majority of
the outstanding shares of common stock of Sub voting as a single class is the
only vote of any class or series of Sub's capital stock required to approve the
Merger and adopt this Agreement.

         Section 4.04. No Conflicts; Consents.

                  (a) The execution, delivery and performance by each of Parent
and Sub of this Agreement do not, and the consummation of the Offer, the Merger
and the other Transactions and compliance with the terms of this Agreement will
not, conflict with, or result in any violation of or default (with or without
notice or lapse of time, or both) under, any provision of (i) the charter or
organizational documents of Parent or any of its subsidiaries, (ii) any Contract
to which Parent or any of its subsidiaries is a party or by which any of their
respective properties or assets is bound or (iii) subject to the filings and
other matters referred to in Section 4.04(b), any Judgment or Law applicable to
Parent or any of its subsidiaries or their respective properties or assets,
subject in the case of clauses (ii) and (iii) above, for such matters as,
individually or in the aggregate, could not reasonably be expected to have a
material adverse effect on (a) the ability of Parent or Sub to perform its
obligations under this Agreement or (b) the ability of Parent or Sub to
consummate the Offer, the Merger and the other Transactions (any of the
foregoing, a "Parent Material Adverse Effect").

                  (b) No Consent of, or registration, declaration or filing
with, or notice to, or Permit from any Governmental Entity is required to be
obtained or made by or with respect to Parent or any of its subsidiaries in
connection with the execution, delivery and performance of this Agreement or the
consummation of the Transactions, other than (i) the filing with the SEC of (A)
the Offer Documents and (B) such reports under the Exchange Act as may be
required in connection with this Agreement, the Offer, the Merger and the other
Transactions, (ii) the filing of the Certificate of Merger with the Secretary of
State of the State of Delaware, (iii) such filings as may be required in
connection with the Taxes described in Section 6.08, (iv) filings under state
securities Laws, and (v) such other items as, individually or in the aggregate,
could not reasonably be expected to have a Parent Material Adverse Effect.


                                       23
   61


         Section 4.05. Information Supplied.

         Subject to the Company's fulfillment of its obligations hereunder with
respect thereto, the Offer Documents will contain (or will be amended in a
timely manner so as to contain) all information which is required to be included
therein in accordance with the Exchange Act and the rules and regulations
thereunder and any other applicable Law and will conform in all material
respects with the requirements of the Exchange Act and any other applicable Law;
and the Offer Documents will not, at the respective times they are filed with
the SEC or published, sent or given to the Company's stockholders, contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary in order to make the statements therein, in
light of the circumstances under which they are made, not misleading.
Notwithstanding the foregoing, no representation or warranty is hereby made by
Parent or Sub with respect to any information supplied by the Company in writing
for inclusion in, or with respect to the Company information derived from the
Company's public SEC filings which is included or incorporated by reference in,
the Offer Documents. None of the information supplied or to be supplied by USX,
Parent or Sub for inclusion or incorporation by reference in, or which may be
deemed to be incorporated by reference in, the Schedule 14D-9 or the Proxy
Statement will, at the respective times the Schedule 14D-9 and the Proxy
Statement are filed with the SEC or published, sent or given to the Company's
stockholders, contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they are made, not
misleading. If any time prior to the Effective Time any event with respect to
Parent or Sub, or with respect to any information supplied by USX, Parent or Sub
for inclusion in the Schedule 14D-9 or the Proxy Statement, shall occur which is
required to be described in an amendment of, or a supplement to, such document,
Parent or Sub shall so describe the event to the Company.

         Section 4.06. Brokers.

         No broker, investment banker, financial advisor or other person is
entitled to any broker's, finder's, financial advisor's or other similar fee or
commission in connection with the Offer, the Merger and the other Transactions
based upon arrangements made by or on behalf of Parent.

         Section 4.07. Financing.

         Parent and Sub now have and will have available (through cash on hand
and existing credit arrangements or otherwise) all of the funds necessary for
the acquisition of all shares of Common Stock pursuant to the Offer and the
Merger, as and when needed, and to perform their respective obligations under
this Agreement.

         Section 4.08. Litigation.

         There is no suit, action, proceeding or investigation pending against,
or to the knowledge of Parent threatened against or affecting, Parent or any of
its subsidiaries before any Governmental Entity that questions the validity of
this Agreement or any action to be taken by Parent or Sub in connection with the
consummation of the Transactions or would otherwise prevent or delay the
consummation of the Transactions.


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         Section 4.09. Ownership of Company Common Stock.

         As of the date hereof, neither Parent nor any of its subsidiaries
beneficially owns any shares of Company Common Stock.

                                   ARTICLE V

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

         Section 5.01. Conduct of Business.

                  (a) Conduct of Business by the Company. Except for matters set
forth in Section 5.01(a) of the Company Disclosure Letter or otherwise expressly
permitted by this Agreement, from the date of this Agreement to the Effective
Time, the Company shall conduct its business in the usual, regular and ordinary
course of business and in substantially the same manner as previously conducted
and use its reasonable best efforts to preserve intact its current business
organization, keep available the services of its current officers and employees
and keep its relationships with customers, suppliers, licensors, licensees,
distributors and others having business dealings with them to the end that its
goodwill and ongoing business shall be unimpaired at the Effective Time. The
Company shall maintain its assets and all parts thereof in as good working order
and condition as at present, ordinary wear and tear excepted, consistent with
past practice, and shall maintain in full force and effect current insurance
policies or other comparable insurance coverage with respect to the assets and
potential liabilities thereof. In addition, and without limiting the generality
of the foregoing, except for matters set forth in Section 5.01(a) of the Company
Disclosure Letter or conduct otherwise expressly permitted by this Agreement,
from the date of this Agreement to the Effective Time, the Company shall not do
any of the following without the prior written consent of Parent:

                           (i) (A) declare, set aside or pay any dividends on,
         or make any other distributions (whether in cash, stock, property or
         otherwise) in respect of, any of its capital stock, (B) split, combine
         or reclassify any of its capital stock or issue or authorize the
         issuance of any other securities in respect of, in lieu of or in
         substitution for shares of its capital stock or (C) purchase, redeem or
         otherwise acquire any shares of capital stock of the Company or any
         other securities thereof or any rights, warrants or options to acquire
         any such shares or other securities;

                           (ii) issue, deliver, sell, grant, pledge, transfer or
         otherwise encumber or dispose of or subject to any Lien (A) any shares
         of its capital stock, (B) any securities convertible into or
         exchangeable for, or any options, warrants, commitments or rights of
         any kind to acquire, any such shares, voting securities or convertible
         or exchangeable securities or (C) any "phantom" stock, "phantom" stock
         rights, stock appreciation rights or stock-based performance units,
         other than the issuance of Company Common Stock upon the exercise of
         Company Stock Options and Warrants outstanding on the date of this
         Agreement and in accordance with their terms as in effect on the date
         of this Agreement;

                           (iii) amend the Company Charter or the Company
         Bylaws;


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                           (iv) acquire or agree to acquire (A) by merging or
         consolidating with, or by purchasing a substantial equity interest in
         or all or a substantial portion of the assets of, or by any other
         manner, any business or any corporation, partnership, company, limited
         liability company, joint venture, association or other business
         organization or division thereof or (B) any assets that, individually
         or in the aggregate, are in excess of $10 million, except purchases of
         inventory in the ordinary course of business;

                           (v) (A) grant to any employee, officer or director of
         the Company any increase in compensation or pay any bonus, except to
         the extent required under employment agreements in effect as of the
         date of the most recent audited financial statements included in the
         Filed Company SEC Documents, (B) grant to any employee, officer or
         director of the Company any increase in severance, change of control or
         termination pay, except to the extent required under any agreement in
         effect as of the date of the most recent audited financial statements
         included in the Filed Company SEC Documents, (C) establish, adopt,
         enter into or amend any Company Benefit Agreement, any collective
         bargaining agreement, other labor union agreement or Company Benefit
         Plan, or (D) take any action to accelerate any rights or benefits, take
         any action to fund or in any other way secure the payment of
         compensation or benefits under any Company Benefit Agreement or Company
         Benefit Plan, or make any material determinations not in the ordinary
         course of business, under any collective bargaining agreement, labor
         union agreement or Company Benefit Plan or Company Benefit Agreement;

                           (vi) make any change in accounting methods,
         principles or practices affecting the reported assets, liabilities or
         results of operations of the Company, except as required by a change in
         GAAP;

                           (vii) sell, lease (as lessor), license, encumber or
         otherwise dispose of or subject to any Lien any properties or assets
         that, individually or in the aggregate, are in excess of $1 million,
         except sales of commodity production, inventory and excess or obsolete
         assets in the ordinary course of business;

                           (viii) (A) incur, assume or prepay any indebtedness
         for borrowed money or guarantee, endorse or otherwise become liable or
         responsible (whether directly, contingently or otherwise) for any
         indebtedness or obligation of another person or issue or sell any debt
         securities or warrants or other rights to acquire any debt securities
         of the Company, except for short-term borrowings incurred in the
         ordinary course of business and additional borrowings under its credit
         facility not to exceed $10 million at any time outstanding, or (B) make
         or forgive any loans, advances or capital contributions to, or
         investments in, any other person;

                           (ix) make or agree to make any new capital
         expenditure or expenditures that, individually or in the aggregate, are
         in excess of $2.0 million in any calendar quarter;

                           (x) make or change any material Tax election or
         settle or compromise any material Tax liability or refund;


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                           (xi) (A) pay, discharge, settle or satisfy any
         claims, liabilities, obligations or litigation, other than the payment,
         discharge, settlement or satisfaction, in the ordinary course of
         business or in accordance with their terms, of liabilities reflected or
         reserved against in the most recent financial statements (or the notes
         thereto) of the Company included in the Filed Company SEC Documents or
         incurred since the date of such financial statements in the ordinary
         course of business or (B) cancel any indebtedness that is material,
         individually or in the aggregate, to the Company, or waive any claims
         or rights of substantial value;

                           (xii) adopt a plan or agreement of, or resolutions
         providing for or authorizing, complete or partial liquidation,
         dissolution, merger, consolidation, restructuring, recapitalization or
         other reorganization;

                           (xiii) make, enter into or renew, extend, amend,
         modify, or waive any provisions of any Material Contract or relinquish
         or waive any rights under, or agree to the termination of, any Material
         Contract, except in the ordinary course of business;

                           (xiv) permit any material insurance policy naming it
         as a beneficiary or a loss payable payee to lapse, be cancelled or
         expire unless a new policy with substantially identical coverage is in
         effect as of the date of lapse, cancellation or expiration; or

                           (xv) authorize, or commit or agree to take, any of
         the foregoing actions or take any action that would (y) make any
         representation or warranty in Article III hereof untrue or incorrect in
         any material respect, or (z) result in any of the conditions to the
         Offer set forth in Annex I hereto or any of the conditions to the
         Merger set forth in Article VII hereof not being satisfied.

                  (b) Advice of Changes. The Company shall promptly advise
Parent of any change or event that has had or could reasonably be expected to
have a Company Material Adverse Effect.

         Section 5.02. No Solicitation.

                  (a) From the date hereof, the Company shall not (whether
directly or indirectly through advisors, agents, representatives or other
intermediaries), and the Company shall use its reasonable best efforts to cause
its officers, directors, advisors, representatives and other agents
(collectively, its "Representatives") not to, directly or indirectly, (i)
continue any discussions or negotiations, if any, with any parties, other than
Parent and Sub, conducted heretofore with respect to any Company Takeover
Proposal (as hereinafter defined) or which could reasonably be expected to lead
to a Company Takeover Proposal, (ii) solicit, initiate or knowingly encourage
any inquiries relating to, or the submission of, any Company Takeover Proposal,
(iii) participate in any discussions or negotiations regarding any Company
Takeover Proposal, or, in connection with any Company Takeover Proposal, furnish
to any person any information or data with respect to or access to the
properties of the Company, or take any other action to facilitate the making of
any proposal that constitutes or may reasonably be expected to lead to any
Company Takeover Proposal or (iv) enter into any agreement with respect to any
Company Takeover Proposal. Notwithstanding the foregoing,


                                       27
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the Company or the Company Board shall be permitted to furnish information with
respect to the Company and participate in discussions or negotiations regarding
an unsolicited bona fide Company Takeover Proposal if, and only to the extent
that, a majority of the entire Company Board determines in good faith that such
Company Takeover Proposal could reasonably be expected to result in a Superior
Company Proposal, in which case the Company will not disclose any information to
such person without entering into a customary confidentiality agreement
containing confidentiality provisions substantially identical to those contained
in the Confidentiality Agreement (as hereinafter defined); provided, however,
that such confidentiality agreement shall not prohibit the presentation of a
Company Takeover Proposal to Parent. The Company shall promptly (but in no case
later than 48 hours after actual receipt by an officer of the Company) provide
Parent with a copy of any written Company Takeover Proposal received and a
written statement with respect to any non-written Company Takeover Proposal
received, which statement shall include the material terms thereof (but may omit
the identity of the person making the Company Takeover Proposal). The Company
shall keep Parent informed on a reasonably current basis of any material
developments with respect to any discussions regarding any Company Takeover
Proposal.

                  (b) Nothing contained in Section 5.02(a) shall prohibit the
Company or the Company Board from (i) taking and disclosing to the Company's
stockholders a position contemplated by Rule 14e-2(a) promulgated under the
Exchange Act (or any similar communications) in connection with the making or
amendment of a tender offer or exchange offer or (ii) making any disclosure to
the Company's stockholders required by applicable Law, provided that the Company
Board shall not recommend that the stockholders of the Company tender their
shares of Company Common Stock in connection with any such tender or exchange
offer unless the Company Board, by majority vote of the entire Company Board,
shall have determined in good faith, based upon (among other things) the advice
of its independent financial advisors and outside counsel, that the relevant
Company Takeover Proposal constitutes a Superior Company Proposal.

                  (c) For purposes of this Agreement:

                  "Company Takeover Proposal" means any inquiry, proposal or
         offer (other than by Parent, Sub or any of their affiliates) for (i) a
         merger, consolidation, share exchange, dissolution, recapitalization,
         liquidation or other business combination involving the Company, (ii)
         the acquisition by any person in any manner, directly or indirectly, of
         a number of shares of any class of equity securities of the Company
         equal to or greater than 15% of the number of such shares outstanding
         before such acquisition or (iii) the acquisition by any person in any
         manner, directly or indirectly, of assets that generate or constitute a
         substantial part of the net revenues, net income or assets of the
         Company, in each case other than the Transactions.

                  "Superior Company Proposal" means any bona fide written
         Company Takeover Proposal made by a third party (other than by Parent,
         Sub or any of their affiliates) to acquire directly or indirectly (i)
         all the equity securities or (ii) the assets of the Company
         substantially as an entirety, which the Company Board determines in
         good faith (based on, among other things, the advice of its independent
         financial advisors and outside counsel), taking into account all legal,
         financial, regulatory and other aspects of the proposal and the person
         making such proposal, (x) would, if consummated, be more favorable,
         from a financial point


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         of view, to the holders of Company Common Stock than the Transactions
         and (y) is reasonably likely to be consummated without undue delay.

                                   ARTICLE VI

                              ADDITIONAL AGREEMENTS

         Section 6.01. Preparation of Proxy Statement; Stockholders Meeting.

                  (a) If the Company Stockholder Approval is required by
applicable Law, the Company shall, as soon as practicable following the
acceptance of shares of Company Common Stock pursuant to the Offer, prepare and
file with the SEC the Proxy Statement in preliminary form, and each of the
Company and Parent shall use its reasonable best efforts to respond as promptly
as practicable to any comments of the SEC with respect thereto. The Company
shall notify Parent promptly of the receipt of any comments from the SEC or its
staff and of any request by the SEC or its staff for amendments or supplements
to the Proxy Statement or for additional information and shall supply Parent
with copies of all correspondence between the Company or any of its
representatives, on the one hand, and the SEC or its staff, on the other hand,
with respect to the Proxy Statement. If at any time prior to receipt of the
Company Stockholder Approval there shall occur any event that should be set
forth in an amendment or supplement to the Proxy Statement, the Company shall
promptly prepare and mail to its stockholders such an amendment or supplement.
No filing of, or amendment to, the Proxy Statement will be made by the Company
without providing Parent the opportunity to review and comment thereon. The
Company shall not mail any Proxy Statement, or any amendment or supplement
thereto, to which Parent reasonably objects. The Company shall use its
reasonable best efforts to cause the Proxy Statement to be mailed to the
Company's stockholders as promptly as practicable after filing with the SEC.

                  (b) If the Company Stockholder Approval is required by
applicable Law, the Company shall, as soon as practicable following the
acceptance of shares of Company Common Stock pursuant to the Offer, duly call,
give notice of, convene and hold a meeting of its stockholders (the "Company
Stockholders Meeting") for the purpose of seeking the Company Stockholder
Approval. The Company shall, through the Company Board, recommend to its
stockholders that they give the Company Stockholder Approval.

                  (c) If the Company Stockholders Meeting is held, Parent shall
cause all shares of Company Common Stock purchased pursuant to the Offer and all
other shares of Company Common Stock owned by Sub or any other subsidiary of
Parent to be voted at the Company Stockholders Meeting in favor of the adoption
of this Agreement and shall, after acceptance of shares of Company Common Stock
pursuant to the Offer, otherwise use its reasonable best efforts to cause the
Merger to be completed as soon as practicable.

                  (d) Notwithstanding the foregoing clauses (a), (b) and (c), if
Sub or any other subsidiary of Parent shall acquire at least 90% of the
outstanding shares of Company Common Stock, the parties shall, as soon as
possible following the acceptance of shares of Company Common Stock pursuant to
the Offer, take all necessary and appropriate action to cause the Merger to
become


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effective as soon as practicable after the expiration of the Offer without a
stockholders meeting in accordance with Section 253 of the DGCL.

         Section 6.02. Access to Information; Confidentiality.

                  (a) The Company shall afford to Parent, and to Parent's
officers, employees, accountants, counsel, financial advisors and other
representatives, access during reasonable business hours during the period prior
to the Effective Time to (i) all of the Company's properties, books, contracts,
commitments, personnel and records and other information and business documents,
(ii) by appointment, the Company's independent reserve engineers and accountants
and (iii) the premises of the Company for the purpose of inspecting the books
and records of the Company, provided that access to the premises shall be
permitted only with the prior consent of the Company (which consent shall not be
unreasonably withheld or delayed). During the period prior to the Effective
Time, Parent will have the full cooperation of the Company in confirming the
nature of the relationships between the Company and its customers, working
interest owners, contractors and suppliers, including whether or not such
relationships are satisfactory and whether or not such relationships are
expected to continue after the Merger. The Company shall have the right to have
a representative present at all times of any such inspections, interviews and
communications conducted by Parent or its representatives.

                  (b) Neither any investigation conducted by Parent or its
representatives pursuant to this Section 6.02 nor the results thereof shall
affect any representation or warranty of the Company contained in this Agreement
or the ability of Parent to rely thereon. All information exchanged pursuant to
this Section 6.02 shall be subject to the confidentiality agreement dated
November 15, 2000, between the Company and Parent (the "Confidentiality
Agreement").

         Section 6.03. Reasonable Best Efforts; Notification.

                  (a) Upon the terms and subject to the conditions set forth in
this Agreement, each of the parties shall use all reasonable best efforts to
take, or cause to be taken, all actions, and to do, or cause to be done, and to
assist and cooperate with the other parties in doing, all things necessary,
proper or advisable to consummate and make effective, in the most expeditious
manner practicable, the Offer, the Merger and the other Transactions, including
(i) determining whether any action by or in respect of or filing with any
Governmental Entities is required or any actions, consents, approvals or waivers
are required to be obtained from third parties in connection with the
Transactions, (ii) the obtaining of all necessary actions or nonactions,
waivers, consents and approvals from Governmental Entities and the making of all
necessary registrations and filings (including filings with Governmental
Entities, if any) and the taking of all reasonable steps as may be necessary to
obtain an approval or waiver from, or to avoid an action or proceeding by, any
Governmental Entity, (iii) the obtaining of all necessary consents, approvals or
waivers from third parties, (iv) the defending of any lawsuits or other legal
proceedings, whether judicial or administrative, challenging this Agreement or
the consummation of the Transactions, including seeking to have any stay or
temporary restraining order entered by any court or other Governmental Entity
vacated or reversed and (v) the execution and delivery of any additional
instruments necessary to consummate the Transactions and to fully carry out the
purposes of this Agreement. Nothing in this Agreement shall be deemed to require
Parent to waive any rights or agree to any limitation on


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its operations or to dispose of any asset or collection of assets of the
Company, Parent or any of their respective subsidiaries or affiliates.

                  (b) The Company shall give prompt notice to Parent, and Parent
or Sub shall give prompt notice to the Company, of (i) any representation or
warranty made by it contained in this Agreement becoming untrue or inaccurate in
any material respect, (ii) the failure by it to comply with or satisfy in any
material respect any covenant, condition or agreement to be complied with or
satisfied by it under this Agreement, (iii) any notice or other communication it
receives from any person alleging that the consent of such person is or may be
required in connection with the Transactions, (iv) any notice or other
communication it receives from any Governmental Entity in connection with the
Transactions or (v) any action, suit, claim, investigation or proceeding
commenced or, to its knowledge, threatened against, relating to or involving or
otherwise affecting it that, if pending on the date of this Agreement, would
have been required to have been disclosed pursuant to Section 3.12 or 4.08, as
applicable, or that relate to the consummation of the Transactions; provided,
however, that no such notification shall affect the representations, warranties,
covenants or agreements of the parties or the conditions to the obligations of
the parties under this Agreement.

         Section 6.04. Stock Options.

                  (a) As soon as practicable following the date of this
Agreement, the Company Board (or, if appropriate, any committee administering
the Company Stock Plan) shall adopt such resolutions or take such other actions
as are required to provide that each Company Stock Option outstanding
immediately prior to the acceptance for payment of shares of Company Common
Stock pursuant to the Offer shall be canceled, with the holder thereof becoming
entitled to receive (i) in the case of each holder listed in Section 6.04(a) of
the Company Disclosure Letter, an amount of cash in respect of such Company
Stock Option equal to the product of (A) the excess, if any, of (x) the Merger
Consideration over (y) the exercise price per share of Company Common Stock
subject to such Company Stock Option and (B) the number of shares of Company
Common Stock subject to such Company Stock Option immediately prior to its
cancellation or (ii) in the case of each other holder, the amount of cash in
respect of such Company Stock Option as provided in the Company Stock Plan upon
a change of control.

                  (b) All amounts payable pursuant to this Section 6.04 shall be
subject to any required withholding of Taxes and shall be paid at or as soon as
practicable following the Effective Time, but in any event within seven days
following the Effective Time, without interest. The Company shall use its
reasonable best efforts to obtain all consents of the holders of the Company
Stock Options as shall be necessary to effectuate the foregoing. The
cancellation of a Company Stock Option in exchange for the cash payment
described in this Section 6.04 shall be deemed a release of any and all rights
the holder of such Company Stock Option had or may have had in respect thereof,
and any required consents from all such holders shall so provide.
Notwithstanding anything to the contrary contained in this Agreement, payment
shall, at Parent's request, be withheld in respect of any Company Stock Option
until all consents, approvals and tax certifications which Parent reasonably
determines to be necessary are obtained.


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                  (c) As soon as practicable following the date of this
Agreement, the Company Board (or, if appropriate, any committee administering
the Company Stock Plan) shall take or cause to be taken such actions as are
required to cause (i) the Company Stock Plan to terminate as of the Effective
Time and (ii) the provisions in any other Company Benefit Plan providing for the
issuance, transfer or grant of any capital stock of the Company or any interest
in respect of any capital stock of the Company to be deleted as of the Effective
Time. The Company shall ensure that following the Effective Time no holder of a
Company Stock Option or any participant in the Company Stock Plan or other
Company Benefit Plan shall have any right thereunder to acquire any capital
stock of the Company or the Surviving Corporation.

                  (d) In this Agreement:

                  "Company Stock Option" means any option to purchase Company
         Common Stock granted under any Company Stock Plan.

                  "Company Stock Plan" means the Company's 1998 Stock Option and
         Incentive Plan as amended from time to time.

         Section 6.05. Indemnification.

                  (a) After the Effective Time, Parent will cause the Surviving
Corporation to indemnify each person who is now, or has been at any time prior
to the date hereof, a director or officer of the Company (individually, an
"Indemnified Party" and, collectively, the "Indemnified Parties"), to the
fullest extent permitted by law, with respect to any liability, loss, damage,
judgment, fine, penalty, amount paid in settlement or compromise with the
approval of the Company (which approval shall not be unreasonably withheld or
delayed), cost or expense (including reasonable fees and expenses of legal
counsel) incurred in connection with any threatened or actual action, suit or
proceeding based on, or arising out of, the fact that such person is or was a
director or officer of the Company ("Indemnified Liabilities"), in each case, to
the full extent that Parent or the Company is permitted under applicable Law to
so indemnify. Any Indemnified Party desiring to claim indemnification under this
Section 6.05(a), upon learning of any such claim, action, suit, proceeding or
investigation, shall promptly notify Parent and the Surviving Corporation (but
the failure so to notify shall not relieve the indemnifying party from any
liability which it may have under this Section 6.05(a) except to the extent such
failure materially prejudices such indemnifying party), and shall deliver to
Parent and the Surviving Corporation all undertakings required under applicable
Law. After Parent's receipt of such notice with respect to any such claim,
action, suit, proceeding or investigation, Parent shall have the right to assume
and direct, or cause the Surviving Corporation to assume and direct, all aspects
of the defense thereof, including settlement, and the Indemnified Party shall
cooperate in the vigorous defense of any such matter. In no event shall Parent
or the Surviving Corporation be liable for any settlement effected without its
prior written consent. The rights to indemnification under this Section 6.05(a)
shall continue in full force and effect for a period of six years from the
Effective Time; provided, however, that all rights to indemnification in respect
of any Indemnified Liabilities asserted or made within such period shall
continue until the disposition of such Indemnified Liabilities.


                                       32
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                  (b) For a period of six years after the Effective Time, Parent
shall cause to be maintained in effect policies of directors' and officers'
insurance, for the benefit of those persons who are covered by the Company's
directors' and officers' liability insurance at the Effective Time, providing
coverage with respect to matters occurring prior to the Effective Time that is
at least equal to the coverage provided under the Company's current directors'
and officers' liability insurance policies, to the extent that such liability
insurance can be maintained at an annual cost to Parent not greater than 150
percent of the premium for the current Company directors' and officers'
liability insurance (which the Company represents and warrants to be not more
than $150,000); provided, however, that if such insurance cannot be so
maintained at or below such cost, Parent shall maintain as much of such
insurance as can be so maintained at a cost equal to 150 percent of the current
annual premiums of the Company for such insurance. The foregoing provisions
shall not in any way restrict or preclude any sale, liquidation or dissolution
of any subsidiary of Parent at any time after the Effective Time. Parent agrees
to pay all expenses (including fees and expenses of counsel) that may be
incurred by any Indemnified Party in successfully enforcing the indemnity or
other obligations under this Section 6.05.

                  (c) In the event Parent or the Surviving Corporation or any of
their successors or assigns (i) consolidates with or merges into any other
person and is not the continuing or surviving corporation or entity of such
consolidation or merger or (ii) transfers or conveys all or substantially all of
its properties and assets to any person, then, and in each such case, proper
provision shall be made so that the successors and assigns of Parent or the
Surviving Corporation shall assume the obligations set forth in this Section
6.05.

                  (d) The provisions of this Section 6.05 are (i) intended to be
for the benefit of, and to be enforceable by, each Indemnified Party, his or her
heirs and his or her representatives and (ii) in addition to, and not in
substitution for, any other rights to indemnification or contribution that any
such person may have by contract or otherwise.

         Section 6.06. Fees and Expenses.

                  (a) Except as provided below, all fees and expenses incurred
in connection with the Merger and the other Transactions shall be paid by the
party incurring such fees or expenses, whether or not the Merger is consummated.

                  (b) In the event that this Agreement is terminated by (i) the
Company pursuant to Section 8.01(d) or (ii) by Parent or Sub pursuant to Section
8.01(c)(i), (iii) or (iv), then the Company shall promptly, but in no event
later than the date of such event, pay to Parent a fee equal to $15 million (the
"Termination Fee"), payable by wire transfer of same day funds, which shall be
deemed to be sole and exclusive liquidated damages for such termination. In
addition, if: (A)(x) this Agreement is terminated by the Company pursuant to
Section 8.01(b)(ii) or by Parent or Sub pursuant to Section 8.01(c)(v) (where
the breach by the Company is willful), (y) prior to such termination a Company
Takeover Proposal has been publicly announced, disclosed or communicated and (z)
on the date of such termination, neither Parent nor Sub is in material breach of
this Agreement and the Minimum Tender Condition has not been satisfied and (B)
within nine months after such termination pursuant to clause (A), the Company
shall consummate or enter into an agreement with respect to any Company Takeover
Proposal, then the Company shall pay the


                                       33
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Termination Fee concurrently with the earlier of entering into any such
agreement or consummating such transaction.

         Section 6.07. Public Announcements.

         Parent and Sub, on the one hand, and the Company, on the other hand,
shall consult with each other before issuing, and provide each other the
opportunity to review and comment upon, any press release or other public
statements with respect to the Offer, the Merger and the other Transactions and
shall not issue any such press release or make any such public statement prior
to such consultation, except after reasonable attempts to provide notice have
been undertaken and such release or statement is required by applicable Law.

         Section 6.08. Transfer Taxes.

         All stock transfer, real estate transfer, documentary, stamp, recording
and other similar Taxes (including interest, penalties and additions to any such
Taxes) ("Transfer Taxes") incurred in connection with the Transactions shall be
paid by the party upon whom the primary burden is placed by the applicable Law.
Each party shall cooperate with the other in preparing, executing and filing any
Tax Returns with respect to such Transfer Taxes, including supplying in a timely
manner a complete list of all real property interests held by the Company and
any information with respect to such property that is reasonably necessary to
complete such Tax Returns.

         Section 6.09. Directors.

         Promptly upon the acceptance for payment of, and payment by Sub for,
any shares of Company Common Stock pursuant to the Offer, Sub shall be entitled
to designate such number of directors on the Company Board as will give Sub,
subject to compliance with Section 14(f) of the Exchange Act, representation on
the Company Board equal to at least that number of directors, rounded up to the
next whole number, that equals the product of (a) the total number of directors
on the Company Board (giving effect to the directors elected pursuant to this
sentence) multiplied by (b) the percentage that (i) such number of shares of
Company Common Stock so accepted for payment and paid for by Sub plus the number
of shares of Company Common Stock otherwise owned by Sub or any other subsidiary
of Parent bears to (ii) the number of such shares then outstanding, and the
Company shall, at such time, cause Sub's designees to be so elected or appointed
to the Company Board; provided, that in the event that Sub's designees are
appointed or elected to the Company Board, until the Effective Time the Company
Board shall have at least two directors who are directors on the date of this
Agreement and who are not officers of the Company (the "Independent Directors");
and provided further that, in such event, if the number of Independent Directors
shall be reduced below two for any reason whatsoever, the remaining Independent
Director shall be entitled to designate a person to fill such vacancy who shall
be deemed to be an Independent Director for purposes of this Agreement or, if no
Independent Directors then remain, the other directors shall designate two
persons to fill such vacancies who are not officers, stockholders or affiliates
of the Company, Parent or Sub, and such persons shall be deemed to be
Independent Directors for purposes of this Agreement. After acceptance by Sub of
shares of Company Common Stock pursuant to the Offer and prior to the Effective
Time, any (i) amendment or termination of this Agreement by the Company, (ii)
extension of time for the performance, or waiver, of the obligations


                                       34
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or other acts of Parent or Sub or (iii) waiver of the Company's rights
hereunder, shall require the approval of all of the Independent Directors (and,
in any event, at least two Independent Directors) in addition to any required
approval thereof by the full Company Board. Subject to applicable Law, the
Company shall take all action requested by Parent necessary to effect any such
election or appointment, including mailing to its stockholders the Information
Statement, and the Company shall make such mailing with the mailing of the
Schedule 14D-9 (provided that Sub shall have provided to the Company on a timely
basis all information required to be included in the Information Statement with
respect to Sub's designees). In connection with the foregoing, the Company shall
promptly, at the option of Sub, either increase the size of the Company Board or
obtain the resignation of such number of its current directors as is necessary
to enable Sub's designees to be elected or appointed to the Company Board as
provided above. The Company will also use its reasonable efforts to cause Sub's
designees to be proportionately represented on each committee of the Company
Board (other than any committee of the Company Board established to take action
under this Agreement). The provisions of this Section 6.09 are in addition to
and, except as specifically contemplated by this Section 6.09, shall not limit
any rights which Sub, Parent or any of their affiliates may have as a holder or
beneficial owner of shares of Company Common Stock as a matter of applicable Law
with respect to the election of directors or otherwise.

         Section 6.10. CMS Operating Agreement.

         The Company has had discussions with CMS Oil & Gas Company ("CMS")
regarding the elimination of Section D of Article XVI of the Operating Agreement
dated November 20, 1998 between CMS and the Company, and the Company will use
its reasonable best efforts to effect an amendment to that agreement prior to
the Effective Time so that such Section D will be eliminated or modified to
remove any effective impediment to drilling proposals consistent with aggressive
development.

         Section 6.11. Further Assurances.

         At and after the Effective Time, the officers and directors of the
Surviving Corporation shall be authorized to execute and deliver, in the name
and on behalf of the Company or Sub, any deeds, bills of sale, assignments or
assurances and to take and do, in the name and on behalf of the Company or Sub,
any other actions and things to vest, perfect or confirm of record or otherwise
in the Surviving Corporation any and all right, title and interest in, to and
under any of the rights, properties or assets of the Company acquired or to be
acquired by the Surviving Corporation as a result of, or in connection with, the
Merger.

                                  ARTICLE VII

                              CONDITIONS PRECEDENT

         Section 7.01. Conditions to Each Party's Obligation to Effect the
Merger.

         The respective obligation of each party to effect the Merger is subject
to the satisfaction or, if permitted by applicable Law, waiver on or prior to
the Closing Date of the following conditions:


                                       35
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                  (a) Stockholder Approval. If required by applicable Law, the
Company shall have obtained the Company Stockholder Approval.

                  (b) No Injunctions or Restraints. No temporary restraining
order, preliminary or permanent injunction or other order issued by any court of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the Merger shall be in effect; provided, however, that prior to
asserting this condition, subject to Section 6.03, the party asserting such
condition shall have used its reasonable best efforts to prevent the entry of
any such injunction or other order and to appeal as promptly as possible any
such injunction or other order that may be entered.

                  (c) Statutory Restraints. No statute, code or regulation shall
have been enacted or promulgated by any Governmental Entity that prohibits
consummation of the Merger.

                  (d) Purchase of Common Stock. Sub shall have previously
accepted for payment and paid for shares of Company Common Stock pursuant to the
Offer.

                                  ARTICLE VIII

                        TERMINATION, AMENDMENT AND WAIVER

         Section 8.01. Termination.

         This Agreement may be terminated and the Merger may be abandoned at any
time prior to the Effective Time, whether before or after approval of matters
presented in connection with the Merger by the stockholders of Sub or, subject
to the terms hereof, the Company:

                  (a) by mutual written consent of Parent and the Company;
provided, however, that if Parent shall have nominated a majority of the
directors pursuant to Section 6.09, such consent of the Company may only be
given if approved by the Independent Directors in accordance with Section 6.09;

                  (b) by either Parent or the Company:

                           (i) if a statute, rule or executive order shall have
         been enacted, entered or promulgated prohibiting the transactions
         contemplated hereby on the terms contemplated by this Agreement or if
         any Governmental Entity shall have issued an order, decree or ruling or
         takes any other action permanently enjoining, restraining or otherwise
         prohibiting the acceptance for payment of, or payment for, shares of
         Company Common Stock pursuant to the Offer or the Merger and such
         order, decree, ruling or other action shall have become final and
         nonappealable; or

                           (ii) if (A) as the result of the failure of any of
         the conditions set forth in Annex I to this Agreement, (1) Sub shall
         have failed to commence the Offer within 30 days following the date of
         this Agreement or (2) the Offer shall have terminated or expired in
         accordance with its terms without Sub having purchased any shares of
         Company Common Stock pursuant to the Offer or (B) Sub shall not have
         accepted for payment any shares of


                                       36
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         Company Common Stock pursuant to the Offer prior to April 30, 2001;
         provided, however, that the right to terminate this Agreement pursuant
         to this clause (ii) shall not be available to any party whose willful
         failure to fulfill any of its obligations under this Agreement results
         in the failure of any such condition or if the failure of such
         condition results from facts or circumstances that constitute a willful
         breach of any representation or warranty of such party contained in
         this Agreement;

                  (c) by Parent or Sub:

                           (i) if, prior to the acceptance for payment of shares
         of Company Common Stock pursuant to the Offer, the Company Board shall
         have withdrawn, or modified or changed in a manner adverse to Parent or
         Sub, its approval or recommendation of the Offer (including by
         amendment to the Schedule 14D-9), this Agreement or the Merger or shall
         have recommended or approved a Company Takeover Proposal; or

                           (ii) if any Person or "group" (as defined in Section
         13(d)(3) of the Exchange Act), other than Parent, Sub or their
         affiliates or any group of which any of them is a member, shall have
         acquired beneficial ownership (as determined pursuant to Rule 13d-3
         under the Exchange Act) of 15% or more of the outstanding shares of
         Company Common Stock;

                           (iii) if there shall have been a material breach by
         the Company of any provision of Section 5.02;

                           (iv) if the Company shall have (i) exempted for
         purposes of Section 203 of the DGCL any acquisition of shares of
         Company Common Stock by any person or "group" (as defined in Section
         13(d)(3) of the Exchange Act), other than USX, Parent, Sub or their
         affiliates, or (ii) amended (or agreed to amend) the Company Rights
         Agreement or redeemed (or agreed to redeem) the outstanding Company
         Rights thereunder for the purpose of exempting an acquisition of shares
         of Company Common Stock (other than pursuant to this Agreement) from
         the Company Rights Agreement and the Company Rights; or

                           (v) if, prior to the acceptance for payment of shares
         of Company Common Stock pursuant to the Offer, (i) there shall be a
         breach of any representation or warranty of the Company in this
         Agreement that is qualified as to materiality or Company Material
         Adverse Effect, (ii) there shall be a breach of any representation or
         warranty of the Company in this Agreement that is not so qualified
         other than any such breaches which, in the aggregate, have not had or
         could not reasonably be expected to have a Company Material Adverse
         Effect, or (iii) there shall be a material breach by the Company of any
         of its covenants or agreements contained in this Agreement, which
         breach, in the case of clause (i), (ii) or (iii), either is not capable
         of being cured or, if it is capable of being cured, has not been cured
         by the earlier of (x) 10 business days following written notice to the
         Company from Parent or Sub of such breach and (y) the expiration of the
         Offer; provided, however, that neither Parent nor Sub may terminate
         this Agreement pursuant to this Section 8.01(c)(v) if Parent or Sub is
         then in material breach of any representation, warranty or covenant
         contained in this Agreement;


                                       37
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                  (d) by the Company if, prior to the acceptance for payment of
shares of Company Common Stock pursuant to the Offer, (A) the Company Board, by
majority vote of the entire Company Board, determines in good faith, based upon
(among other things) the advice of outside financial advisors and outside
counsel to the Company, that a Company Takeover Proposal constitutes a Superior
Company Proposal, (B) the Company, at the direction of the Company Board,
notifies Parent in writing that it intends to enter into an agreement with
respect to such Superior Company Proposal, which notification identifies the
person making the Superior Company Proposal and attaches the most current
version of such agreement (or a complete and accurate description of all
material terms and conditions thereof), (C) Parent does not make, within three
business days of receipt of the Company's written notification of its intention
to enter into a binding agreement for a Superior Company Proposal, an offer that
the Company Board determines, in good faith after consultation with its
financial advisors, is at least as favorable to the stockholders of the Company
as such Superior Company Proposal, it being understood that the Company shall
not enter into any such binding agreement during such three-business day period
and (D) the Company concurrently with such termination pursuant to this clause
(e)(i) pays to Parent in immediately available funds the Termination Fee (as
provided in Section 6.06). The Company agrees to notify Parent promptly if its
intention to enter into a written agreement referred to in its notification
shall change at any time after giving effect to such notification; or

                  (e) by the Company prior to the consummation of the Offer, if
(A) there shall be a breach of any representation or warranty of Parent or Sub
in this Agreement that is qualified as to materiality or Parent Material Adverse
Effect, (B) there shall be a breach of any representation or warranty of Parent
or Sub in this Agreement that is not so qualified, other than any such breaches
which, in the aggregate, have not had or could not reasonably be expected to
have a Parent Material Adverse Effect or (C) there shall be a material breach by
Parent or Sub of any of its covenants or agreements contained in this Agreement,
which breach, in the case of clause (A), (B) or (C), either is not capable or
being cured or, if it is capable of being cured, has not been cured by the
earlier of (x) 10 business days following written notice to Parent from the
Company of such breach and (y) the expiration of the Offer; provided that the
Company may not terminate this Agreement pursuant to this Section 8.01(f) if the
Company is then in material breach of any representation, warranty or covenant
contained in this Agreement.

         Section 8.02. Effect of Termination.

         In the event of termination of this Agreement by either the Company or
Parent or Sub as provided in Section 8.01, this Agreement shall forthwith become
void and have no effect, without any liability or obligation on the part of
Parent, Sub or the Company, other than Section 6.06, this Section 8.02 and
Article IX, which provisions shall survive such termination, and except that
nothing in this Section 8.02 shall relieve a party from liability for fraud or
liability for the willful breach by a party of any representation, warranty or
covenant set forth in this Agreement and such party shall be fully liable for
any and all liabilities and damages incurred or suffered by the other party as a
result of any such breach.


                                       38
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         Section 8.03. Amendment.

         Subject to Section 6.09, this Agreement may be amended, supplemented or
modified by the parties at any time before or after receipt of the Company
Stockholder Approval only by an instrument in writing signed on behalf of each
of the parties; provided, however, that after receipt of the Company Stockholder
Approval, there shall be made no amendment, supplement or modification that by
Law requires further approval by the stockholders of the Company without the
further approval of such stockholders.

         Section 8.04. Extension; Waiver.

         Subject to Section 6.09, at any time prior to the Effective Time, (a)
the parties may extend the time for the performance of any of the obligations or
other acts of the other parties, (b) each party may waive any inaccuracies in
the representations and warranties of another party contained in this Agreement
or in any document delivered pursuant to this Agreement or (c) subject to the
proviso of Section 8.03, each party may waive compliance with any of the
agreements or conditions of another party contained in this Agreement. Subject
to Section 6.09, any agreement on the part of a party to any such extension or
waiver shall be valid only if set forth in an instrument in writing signed on
behalf of such party. The failure of any party to this Agreement to assert any
of its rights under this Agreement or otherwise shall not constitute a waiver of
such rights.

         Section 8.05. Procedure for Termination, Amendment, Extension or
Waiver.

         Subject to Section 6.09, a termination of this Agreement pursuant to
Section 8.01, an amendment, modification or supplement of this Agreement
pursuant to Section 8.03 or an extension or waiver pursuant to Section 8.04
shall, in order to be effective, require in the case of Parent, Sub or the
Company, action by its Board of Directors or the duly authorized designee of its
Board of Directors.

                                   ARTICLE IX

                               GENERAL PROVISIONS

         Section 9.01. Nonsurvival of Representations and Warranties.

         None of the representations and warranties in this Agreement or in any
instrument delivered pursuant to this Agreement shall survive the Effective
Time. This Section 9.01 shall not limit any covenant or agreement of the parties
which by its terms contemplates performance after the Effective Time.

         Section 9.02. Notices.

         All notices, requests, claims, demands and other communications under
this Agreement shall be in writing and shall be deemed given upon receipt (or
upon the next succeeding business day if received after 5 p.m. local time on a
business day or if received on a Saturday, Sunday or United States holiday) by
the parties at the following addresses (or at such other address for a party as
shall be specified by like notice):


                                       39
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                  (a) if to Parent or Sub, to:

                      Marathon Oil Company
                      5555 San Felipe Road
                      Houston, Texas 77056-2723
                      Attention: President
                                 General Counsel

                      with a copy to:

                      Baker Botts L.L.P.
                      3000 One Shell Plaza
                      910 Louisiana
                      Houston, Texas 77002-4995
                      Attention: R. Joel Swanson, Jr.

                  (b) if to the Company, to:

                      Pennaco Energy, Inc.
                      1050 17th Street, Suite 700
                      Denver, Colorado 80265-2076
                      Attention: Glen C. Warren, Jr.

                      with a copy to:

                      Vinson & Elkins L.L.P.
                      2300 First City Tower
                      1001 Fannin Street
                      Houston, Texas 77002-6760
                      Attention: David P. Oelman

         Section 9.03. Definitions.

         For purposes of this Agreement:

                  An "affiliate," when used with reference to any person, shall
         have the meaning ascribed to such term in Rule 12b-2 of the Exchange
         Act, as in effect on the date of this Agreement.

                  A "business day" means any day other than Saturday, Sunday or
         any other day on which banks in the City of New York are required or
         permitted by applicable Law to close.

                  A "Company Material Adverse Effect" means a material adverse
         effect on (i) the business, operations, assets, condition (financial or
         otherwise), or results of operations of the Company, (ii) the ability
         of the Company to perform its obligations under this Agreement or (iii)
         the ability of the Company to consummate the Offer, the Merger and the
         other


                                       40
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         Transactions; provided, however, that effects relating to (a) the
         economy in general, (b) changes in oil, gas or other hydrocarbon
         commodity prices or other changes affecting the oil and gas industry
         generally or (c) the announcement of the transactions contemplated
         hereby, shall not be deemed to constitute a Company Material Adverse
         Effect or be considered in determining whether a Company Material
         Adverse Effect has occurred.

                  "in the ordinary course of business," with respect to any
         action, means such action is:

                           (a) consistent with the past custom and practices of
                  such person (including with respect to quantity and frequency)
                  and is taken in the ordinary course of the normal day-to-day
                  operations of such person;

                           (b) not required to be authorized by the Board of
                  Directors of such person; and

                           (c) similar in nature and magnitude to actions
                  customarily taken, without any authorization by the Board of
                  Directors, in the ordinary course of the normal day-to-day
                  operations of other persons that are in the same line of
                  business as such person.

                  A "person" means any individual, firm, corporation,
         partnership, company, limited liability company, trust, joint venture,
         association, Governmental Entity or other entity of any kind.

                  A "subsidiary" of any person means any other person of which
         (i) such person or any subsidiary thereof is a general partner, (ii)
         such person and/or one or more of its subsidiaries holds voting power
         to elect a majority of the board of directors or others performing
         similar functions or (iii) such person, directly or indirectly, owns or
         controls more than 50% of the equity interests of such other person.

                  Words and terms used in this Agreement which are defined in
         other Sections of this Agreement are used throughout this Agreement as
         therein defined.

         Section 9.04. Interpretation.

         When a reference is made in this Agreement to a Section or an Article,
such reference shall be to a Section or Article of this Agreement unless
otherwise indicated. The table of contents and headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation."

         Section 9.05. Severability.

         If any term or other provision of this Agreement is invalid, illegal or
incapable of being enforced by any rule or Law, or public policy, all other
terms and provisions of this Agreement shall


                                       41
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nevertheless remain in full force and effect so long as the economic and legal
substance of the Transactions is not affected in any manner materially adverse
to any party. Upon such determination that any term or other provision is
invalid, illegal or incapable of being enforced, the parties hereto shall
negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible in an acceptable manner to the end
that the Transactions are fulfilled to the extent possible.

         Section 9.06. Counterparts.

         This Agreement may be executed in one or more counterparts, all of
which shall be considered one and the same agreement, and shall become effective
when one or more counterparts have been signed by each of the parties and
delivered to the other parties.

         Section 9.07. Entire Agreement; No Third-Party Beneficiaries.

         This Agreement, taken together with the Company Disclosure Letter, (a)
constitutes the entire agreement, and supersedes all prior agreements and
understandings, both written and oral, among the parties with respect to the
Transactions and (b) except for the provisions of Article II, Section 6.05 and
Section 6.09, is not intended to confer upon any person other than the parties
hereto any rights, remedies, obligations or liabilities.

         Section 9.08. Governing Law.

         This Agreement shall be governed by, and construed in accordance with,
the laws of the State of Delaware, regardless of the laws that might otherwise
govern under applicable principles of conflicts of laws thereof.

         Section 9.09. Assignment.

         Neither this Agreement nor any of the rights, interests or obligations
under this Agreement shall be assigned, in whole or in part, by operation of law
or otherwise by any of the parties without the prior written consent of the
other parties. Any purported assignment without such consent shall be void.
Subject to the preceding sentences, this Agreement will be binding upon, inure
to the benefit of, and be enforceable by, the parties and their respective
successors and assigns.

         Section 9.10. Limitations on Warranties.

                  (a) Except for the representations and warranties contained in
Article III of this Agreement and in the Company Disclosure Letter, the Company
makes no other express or implied representation or warranty to Parent or Sub.
Parent and Sub each acknowledge that, in entering into this Agreement, it has
not relied on any representations or warranties of the Company other than the
representations and warranties of the Company set forth in Article III of this
Agreement or the Company Disclosure Letter.

                  (b) Except for the representations and warranties contained in
Article IV of this Agreement, Parent and Sub make no other express or implied
representation or warranty to the Company. The Company acknowledges that, in
entering into this Agreement, it has not relied on any representations or
warranties of Parent and Sub other than the representations and warranties of
Parent and Sub set forth in Article IV of this Agreement.


                                       42
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         IN WITNESS WHEREOF, Parent, Sub and the Company have duly executed this
Agreement, all as of the date first written above.

                                       MARATHON OIL COMPANY


                                       By: /s/ Clarence P. Cazalot, Jr.
                                           ----------------------------
                                           Clarence P. Cazalot, Jr.
                                           President

                                       MARATHON OIL ACQUISITION 1, LTD.


                                       By: /s/ Richard J. Murphy
                                           ----------------------------
                                           Richard J. Murphy
                                           President

                                       PENNACO ENERGY, INC.


                                       By: /s/ Paul M. Rady
                                           ----------------------------
                                           Paul M. Rady
                                           President



   81


                                     ANNEX I

                             CONDITIONS OF THE OFFER

         The capitalized terms used in this Annex I have the meanings set forth
in the attached Agreement and Plan of Merger (the "Agreement"). Notwithstanding
any other term of the Offer or this Agreement, Sub shall not be required to
accept for payment or, subject to any applicable rules and regulations of the
SEC, including Rule 14e-1(c) under the Exchange Act (relating to Sub's
obligation to pay for or return tendered shares of Company Common Stock promptly
after the termination or withdrawal of the Offer), to pay for, and may postpone
the acceptance for payment of and payment for, shares of Company Common Stock
tendered, and, except as set forth in the Agreement, terminate the Offer as to
any shares of Company Common Stock not then paid for if there shall not have
been validly tendered and not withdrawn prior to the expiration of the Offer
that number of shares of Company Common Stock which would represent at least a
majority of the Fully Diluted Shares on the date of purchase (the "Minimum
Tender Condition"). The term "Fully Diluted Shares" means all outstanding
securities entitled generally to vote in the election of directors of the
Company on a fully diluted basis, after giving effect to the exercise or
conversion of all options, rights and securities exercisable or convertible into
such voting securities. Furthermore, notwithstanding any other term of the Offer
or this Agreement, Sub shall not be required to commence the Offer, accept for
payment or, subject as aforesaid, to pay for any shares of Company Common Stock
not theretofore accepted for payment or paid for, and may terminate or amend the
Offer, with the consent of the Company or if, at any time on or after the date
of this Agreement and before the acceptance of such shares for payment or the
payment therefor, any of the following conditions exists:

                  (a) there shall be pending any suit, action or proceeding by
any Governmental Entity, or pending any suit, action or proceeding that has a
reasonable likelihood of success by any other person, (i) seeking to restrain,
prohibit or make illegal or materially more costly the making or consummation of
the Offer or the Merger or any other Transaction, (ii) seeking to prohibit or
limit the ownership or operation by the Company, Parent or any of their
respective subsidiaries of any material portion of the business or assets of the
Company, Parent or any of their respective subsidiaries or affiliates, or to
compel the Company, Parent or any of their respective subsidiaries or affiliates
to dispose of or hold separate any material portion of the business or assets of
the Company, Parent or any of their respective subsidiaries or affiliates, as a
result of the Offer, the Merger or any other Transaction, (iii) seeking to
impose limitations on the ability of Parent or Sub to acquire or hold, or
exercise full rights of ownership of, any shares of Company Common Stock,
including the right to vote the Company Common Stock purchased by it on all
matters properly presented to the stockholders of the Company, (iv) seeking to
prohibit Parent or any of its subsidiaries from effectively controlling in any
material respect the business or operations of the Company or (v) that otherwise
could reasonably be expected to have a Company Material Adverse Effect;

                  (b) any statute, rule, regulation, legislation,
interpretation, judgment, order or injunction shall be enacted, entered,
enforced, promulgated, amended or issued with respect to, or deemed applicable
to, or any consent or approval withheld with respect to, (i) Parent, the Company


                                       I-1
   82


or any of their respective subsidiaries or affiliates or (ii) the Offer, the
Merger or any other Transaction, in either case by any Governmental Entity that
is reasonably likely to result, directly or indirectly, in any of the
consequences referred to in paragraph (a) above;

                  (c) (i) it shall have been publicly disclosed or Parent shall
have otherwise learned that beneficial ownership (determined for the purposes of
this paragraph as set forth in Rule 13d-3 promulgated under the Exchange Act) of
more than 15% of the outstanding shares of the Company Common Stock has been
acquired by another person or (ii) the Company Board or any committee thereof
shall have (1) withdrawn or modified the approval or recommendation of the
Company Board of the Offer (including by amendment of the Schedule 14D-9) in a
manner adverse to Parent or Sub, (2) approved or recommended to the stockholders
of the Company a Company Takeover Proposal or announced its intention to enter
into an agreement with respect to a Company Takeover Proposal, (3) approved or
recommended that the stockholders of the Company tender their shares of Company
Common Stock into any tender offer or exchange offer that is a Company Takeover
Proposal or is related thereto or (4) resolved to do any of the foregoing;

                  (d) the representations or warranties of the Company set forth
in the Agreement that are qualified by materiality or Company Material Adverse
Effect shall not be true and correct, or the representations and warranties of
the Company set forth in the Agreement that are not so qualified shall not be
true and correct in all material respects, in each case, as if such
representations or warranties were made as of such time (except to the extent
such representations and warranties speak as of a specific date or as of the
date hereof, in which case such representations and warranties shall not be so
true and correct or true and correct in all material respects, as the case may
be, as of such specific date or as of the date hereof, respectively);

                  (e) there shall have occurred any changes, conditions, events
or developments that, individually or in the aggregate, could reasonably be
expected to have a Company Material Adverse Effect;

                  (f) the Company shall have breached in any material respect
any material agreement or covenant of the Company under this Agreement; or

                  (g) this Agreement shall have been terminated in accordance
with its terms;

in each case which, and regardless of the circumstances giving rise to any such
condition (including any action or inaction by Parent or any of its affiliates),
makes it inadvisable, in the sole and absolute discretion of Parent, to proceed
with such acceptance for payment or payment.

         The foregoing conditions are for the sole benefit of Sub and Parent and
may be asserted by Sub or Parent regardless of the circumstances giving rise to
such condition or may be waived by Sub and Parent in whole or in part at any
time and from time to time in their sole discretion; provided, however, that the
Minimum Tender Condition may not be waived. The failure by Parent, Sub or any
other affiliate of Parent at any time to exercise any of the foregoing rights
shall not be deemed a waiver of any such right, the waiver of any such right
with respect to particular facts and circumstances shall not be deemed a waiver
with respect to any other facts and circumstances and each such right shall be
deemed an ongoing right that may be asserted at any time and from time to time.
Any determination by Parent with respect to the foregoing conditions shall be
final and binding on the parties.


                                      I-2
   83

                             AMENDMENT TO AGREEMENT
                               AND PLAN OF MERGER


                  THIS AMENDMENT TO AGREEMENT AND PLAN OF MERGER dated as of
February 2, 2001 (this "Amendment") by and among MARATHON OIL COMPANY, an Ohio
corporation ("Parent"), MARATHON OIL ACQUISITION 1, LTD., a Delaware corporation
and a direct wholly owned subsidiary of Parent ("Sub"), and PENNACO ENERGY,
INC., a Delaware corporation (the "Company").

                              PRELIMINARY STATEMENT

                  The parties hereto also are the parties to an Agreement and
Plan of Merger dated as of December 22, 2000 (the "Merger Agreement"), and they
desire to amend the Merger Agreement as provided herein.

                  NOW, THEREFORE, in consideration of the premises and the
mutual agreements this Amendment contains, Parent, Sub and the Company hereby
agree as follows:

                  Section 1. Amendment. (a) Section 1.07 of the Merger Agreement
hereby is amended to read in its entirety as follows:

                  Section 1.07. Certificate of Incorporation and Bylaws.

                  (a) The Certificate of Incorporation of the Company, as in
         effect immediately prior to the Effective Time, shall be amended at the
         Effective Time to read in its entirety as set forth in Exhibit A
         hereto; and, as so amended, that Certificate of Incorporation shall be
         the Certificate of Incorporation of the Surviving Corporation until
         thereafter changed or amended in accordance with the provisions thereof
         and applicable Law.

                  (b) The Bylaws of the Company, as in effect immediately prior
         to the Effective Time, shall amended in their entirety at the Effective
         Time to read as the Bylaws of Sub, as in effect immediately prior to
         the Effective Time, provided that those amended Bylaws shall provide
         that the name of the Company is "Pennaco Energy, Inc."; and, as so
         amended, those Bylaws shall be the Bylaws of the Surviving Corporation
         until thereafter changed or amended in accordance with the provisions
         thereof and the provisions of the Certificate of Incorporation of the
         Surviving Corporation and applicable Law.

                  Section 2. Representatives and Warranties of the Company. The
Company represents and warrants to Parent and Sub as follows:

                  (a) The Company has all requisite corporate power and
         authority to execute and deliver this Amendment. The execution and
         delivery by the Company of this Amendment have been duly authorized by
         all necessary corporate action on the part of the Company, including
         approval of the Board of Directors of the Company in accordance with
         the provisions of Section 8.05 of the Merger Agreement.




                                       1
   84

                  (b) The Company has duly executed and delivered this
         Amendment, and this Amendment constitutes the legal, valid and binding
         obligation, enforceable against the Company in accordance with the
         terms hereof, except as that enforceability may be limited by any
         applicable bankruptcy, insolvency, reorganization, moratorium or
         similar laws affecting the enforcement of creditor's rights generally
         and the application of general principles of equity (regardless of
         whether that enforceability is considered in a proceeding at law or in
         equity).

                  Section 3. Representations and Warranties of Parent and Sub.
Parent and Sub, jointly and severally represent and warrant to the Company as
follows:

                  (a) Each of Parent and Sub has all requisite corporate power
         and authority to execute and deliver this Amendment. The execution and
         delivery by each of Parent and Sub of this Amendment have been duly
         authorized by all necessary corporate action on the part of Parent and
         Sub.

                  (b) Each of Parent and Sub has duly executed and delivered
         this Amendment, and this Amendment constitutes its legal, valid and
         binding obligation, enforceable against it in accordance with the terms
         hereof, except as that enforceability may be limited by any applicable
         bankruptcy, insolvency, reorganization, moratorium or similar laws
         affecting the enforcement of creditor's rights generally and the
         application of general principles of equity (regardless of whether that
         enforceability is considered in a proceeding at law or in equity).

                  Section 4. Effect on Merger Agreement. When this Amendment
becomes effective pursuant to the provisions of Section 5 hereof, all references
to "this Agreement" in the Merger Agreement shall be deemed to refer to the
Merger Agreement as amended by this Amendment, unless the context otherwise
requires. Except as amended hereby, all provisions of the Merger Agreement are
and will remain in full force and effect.

                  Section 5. Execution in Counterparts; Effectiveness. This
Amendment may be executed in any number of counterparts, each of which will be
deemed for all purposes to be an original, but all of which together will
constitute one and the same Amendment. This Amendment will become effective
immediately on execution and delivery by the parties hereto.

                  Section 6. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY,
AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, REGARDLESS
OF THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER APPLICABLE PRINCIPLES OF CONFLICTS
OF LAWS THEREOF.




                                       2
   85
                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment as of the date first above written.

                                  MARATHON OIL COMPANY


                                  By:   /s/ Clarence P. Cazalot, Jr.
                                     ------------------------------------------
                                       Clarence P. Cazalot, Jr.
                                       President

                                  MARATHON OIL ACQUISITION 1, LTD.


                                  By:   /s/ Richard J. Murphy
                                     ------------------------------------------
                                       Richard J. Murphy
                                       President

                                  PENNACO ENERGY, INC.


                                  By:   /s/ Paul M. Rady
                                     ------------------------------------------
                                       Paul M. Rady
                                       President




                                       3
   86
                                                                       EXHIBIT A

                          CERTIFICATE OF INCORPORATION
                                       OF
                              PENNACO ENERGY, INC.


FIRST:            The name of the Corporation is PENNACO ENERGY, INC. (the
                  "Corporation").

SECOND:           The address of the registered office of the Corporation in the
                  State of Delaware is 1209 Orange Street, Wilmington, County of
                  New Castle, Delaware 19801. The name of the registered agent
                  of the Corporation at such address is The Corporation Trust
                  Company.

THIRD:            The purpose of the Corporation is to engage in, carry on and
                  conduct any lawful business, act or activity for which
                  corporations may be organized under the General Corporation
                  Law of the State of Delaware (the "DGCL").

FOURTH:           The total number of shares of stock which the Corporation will
                  have authority to issue is 1,000 shares of common stock, which
                  shares will be without par value ("Common Stock").

FIFTH:            Each holder of Common Stock shall have one vote in respect of
                  each share of Common Stock held by such holder on any matter
                  submitted to the stockholders of the Corporation. Cumulative
                  voting of shares of Common Stock is prohibited. Shares of
                  Common Stock may be issued for such consideration and for such
                  corporate purposes as the Board of Directors of the
                  Corporation may from time to time determine. In the event of
                  voluntary or involuntary liquidation, distribution or sale of
                  assets, dissolution or winding-up of the Corporation, the
                  holders of the Common Stock shall be entitled to receive all
                  the assets of the Corporation, tangible and intangible, of
                  whatever kind available for distribution to stockholders,
                  ratably in proportion to the number of shares of Common Stock
                  held by each.

SIXTH:            The number of directors that shall constitute the whole Board
                  of Directors of the Corporation shall be as from time to time
                  fixed by, or in the manner provided in, the by-laws of the
                  Corporation. The election of directors need not be by written
                  ballot, unless the by-laws so provide. Each director shall
                  hold office for the full term for which such director is
                  elected and until such director's successor shall have been
                  duly elected and qualified or until his earlier death,
                  resignation or removal.

SEVENTH:          The business and affairs of the Corporation shall be managed
                  by or under the direction of the Board of Directors. In
                  furtherance and not in limitation of the powers conferred by
                  the DGCL, the Board of Directors of the Corporation is
                  expressly authorized to adopt, amend or repeal the by-laws of
                  the Corporation; provided, however, that the grant of such
                  authority shall not divest the stockholders of the Corporation
                  of the power, nor limit their power to adopt, amend or repeal
                  the by-laws of the Corporation.




                                      A-1
   87

EIGHTH:           No director of the Corporation shall be personally liable to
                  the Corporation or any of its stockholders for monetary
                  damages for breach of fiduciary duty as a director involving
                  any act or omission of any such director; provided, however,
                  that the foregoing provision shall not eliminate or limit the
                  liability of a director (a) for any breach of the director's
                  duty of loyalty to the Corporation or its stockholders, (b)
                  for acts or omissions not in good faith or which involve
                  intentional misconduct or a knowing violation of law, (c)
                  under Section 174 of the DGCL, as the same exists or hereafter
                  may be amended, supplemented, or replaced or (d) for any
                  transaction from which such director derived an improper
                  personal benefit. Any repeal or modification of this Article
                  EIGHTH shall be prospective only and shall not adversely
                  affect any limitation on the personal liability of a director
                  of the Corporation existing at the time of such repeal or
                  modification.




                                      A-2
   88
                                                                      APPENDIX C

               SECTION 262 OF THE DELAWARE GENERAL CORPORATION LAW

     262 APPRAISAL RIGHTS. (a) Any stockholder of a corporation of this State
who holds shares of stock on the date of the making of a demand pursuant to
subsection (d) of this section with respect to such shares, who continuously
holds such shares through the effective date of the merger or consolidation, who
has otherwise complied with subsection (d) of this section and who has neither
voted in favor of the merger or consolidation nor consented thereto in writing
pursuant to ss.228 of this title shall be entitled to an appraisal by the Court
of Chancery of the fair value of the stockholder's shares of stock under the
circumstances described in subsections (b) and (c) of this section. As used in
this section, the word "stockholder" means a holder of record of stock in a
stock corporation and also a member of record of a nonstock corporation; the
words "stock" and "share" mean and include what is ordinarily meant by those
words and also membership or membership interest of a member of a nonstock
corporation; and the words "depository receipt" mean a receipt or other
instrument issued by a depository representing an interest in one or more
shares, or fractions thereof, solely of stock of a corporation, which stock is
deposited with the depository.

     (b)  Appraisal rights shall be available for the shares of any class or
series of stock of a constituent corporation in a merger or consolidation to be
effected pursuant to ss.251 (other than a merger effected pursuant to ss.251(g)
of this title), ss.252, ss.254, ss.257, ss.258, ss.263 or ss.264 of this title:

          (1) Provided, however, that no appraisal rights under this section
     shall be available for the shares of any class or series of stock, which
     stock, or depository receipts in respect thereof, at the record date fixed
     to determine the stockholders entitled to receive notice of and to vote at
     the meeting of stockholders to act upon the agreement of merger or
     consolidation, were either (i) listed on a national securities exchange or
     designated as a national market system security on an interdealer quotation
     system by the National Association of Securities Dealers, Inc. or (ii) held
     of record by more than 2,000 holders; and further provided that no
     appraisal rights shall be available for any shares of stock of the
     constituent corporation surviving a merger if the merger did not require
     for its approval the vote of the stockholders of the surviving corporation
     as provided in subsection (f) of ss.251 of this title.

          (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
     under this section shall be available for the shares of any class or series
     of stock of a constituent corporation if the holders thereof are required
     by the terms of an agreement of merger or consolidation pursuant to
     ss.ss.251, 252, 254, 257, 258, 263 and 264 of this title to accept for such
     stock anything except:

               a. Shares of stock of the corporation surviving or resulting from
          such merger or consolidation, or depository receipts in respect
          thereof;

               b. Shares of stock of any other corporation, or depository
          receipts in respect thereof, which shares of stock (or depository
          receipts in respect thereof) or depository receipts at the effective
          date of the merger or consolidation will be either listed on a
          national securities exchange or designated as a national market system
          security on an interdealer quotation system by the National
          Association of Securities Dealers, Inc. or held of record by more than
          2,000 holders;

               c. Cash in lieu of fractional shares or fractional depository
          receipts described in the foregoing subparagraphs a. and b. of this
          paragraph; or

               d. Any combination of the shares of stock, depository receipts
          and cash in lieu of fractional shares or fractional depository
          receipts described in the foregoing subparagraphs a., b. and c. of
          this paragraph.

          (3) In the event all of the stock of a subsidiary Delaware corporation
     party to a merger effected under ss.253 of this title is not owned by the
     parent corporation immediately prior to the merger, appraisal rights shall
     be available for the shares of the subsidiary Delaware corporation.





   89

     (c)  Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets of
the corporation. If the certificate of incorporation contains such a provision,
the procedures of this section, including those set forth in subsections (d) and
(e) of this section, shall apply as nearly as is practicable.

     (d)  Appraisal rights shall be perfected as follows:

          (1) If a proposed merger or consolidation for which appraisal rights
     are provided under this section is to be submitted for approval at a
     meeting of stockholders, the corporation, not less than 20 days prior to
     the meeting, shall notify each of its stockholders who was such on the
     record date for such meeting with respect to shares for which appraisal
     rights are available pursuant to subsection (b) or (c) hereof that
     appraisal rights are available for any or all of the shares of the
     constituent corporations, and shall include in such notice a copy of this
     section. Each stockholder electing to demand the appraisal of such
     stockholder's shares shall deliver to the corporation, before the taking of
     the vote on the merger or consolidation, a written demand for appraisal of
     such stockholder's shares. Such demand will be sufficient if it reasonably
     informs the corporation of the identity of the stockholder and that the
     stockholder intends thereby to demand the appraisal of such stockholder's
     shares. A proxy or vote against the merger or consolidation shall not
     constitute such a demand. A stockholder electing to take such action must
     do so by a separate written demand as herein provided. Within 10 days after
     the effective date of such merger or consolidation, the surviving or
     resulting corporation shall notify each stockholder of each constituent
     corporation who has complied with this subsection and has not voted in
     favor of or consented to the merger or consolidation of the date that the
     merger or consolidation has become effective; or

          (2) If the merger or consolidation was approved pursuant to ss.228 or
     ss.253 of this title, each constituent corporation, either before the
     effective date of the merger or consolidation or within ten days
     thereafter, shall notify each of the holders of any class or series of
     stock of such constituent corporation who are entitled to appraisal rights
     of the approval of the merger or consolidation and that appraisal rights
     are available for any or all shares of such class or series of stock of
     such constituent corporation, and shall include in such notice a copy of
     this section; provided that, if the notice is given on or after the
     effective date of the merger or consolidation, such notice shall be given
     by the surviving or resulting corporation to all such holders of any class
     or series of stock of a constituent corporation that are entitled to
     appraisal rights. Such notice may, and, if given on or after the effective
     date of the merger or consolidation, shall, also notify such stockholders
     of the effective date of the merger or consolidation. Any stockholder
     entitled to appraisal rights may, within 20 days after the date of mailing
     of such notice, demand in writing from the surviving or resulting
     corporation the appraisal of such holder's shares. Such demand will be
     sufficient if it reasonably informs the corporation of the identity of the
     stockholder and that the stockholder intends thereby to demand the
     appraisal of such holder's shares. If such notice did not notify
     stockholders of the effective date of the merger or consolidation, either
     (i) each such constituent corporation shall send a second notice before the
     effective date of the merger or consolidation notifying each of the holders
     of any class or series of stock of such constituent corporation that are
     entitled to appraisal rights of the effective date of the merger or
     consolidation or (ii) the surviving or resulting corporation shall send
     such a second notice to all such holders on or within 10 days after such
     effective date; provided, however, that if such second notice is sent more
     than 20 days following the sending of the first notice, such second notice
     need only be sent to each stockholder who is entitled to appraisal rights
     and who has demanded appraisal of such holder's shares in accordance with
     this subsection. An affidavit of the secretary or assistant secretary or of
     the transfer agent of the corporation that is required to give either
     notice that such notice has been given shall, in the absence of fraud, be
     prima facie evidence of the facts stated therein. For purposes of
     determining the stockholders entitled to receive either notice, each
     constituent corporation may fix, in advance, a record date that shall be
     not more than 10 days prior to the date the notice is given, provided, that
     if the notice is given on or after the effective date of the merger or
     consolidation, the record date shall be such effective date. If no record
     date is fixed and the notice is given prior to the effective date, the
     record date shall be the close of business on the day next preceding the
     day on which the notice is given.


   90
          (e) Within 120 days after the effective date of the merger or
     consolidation, the surviving or resulting corporation or any stockholder
     who has complied with subsections (a) and (d) hereof and who is otherwise
     entitled to appraisal rights, may file a petition in the Court of Chancery
     demanding a determination of the value of the stock of all such
     stockholders. Notwithstanding the foregoing, at any time within 60 days
     after the effective date of the merger or consolidation, any stockholder
     shall have the right to withdraw such stockholder's demand for appraisal
     and to accept the terms offered upon the merger or consolidation. Within
     120 days after the effective date of the merger or consolidation, any
     stockholder who has complied with the requirements of subsections (a) and
     (d) hereof, upon written request, shall be entitled to receive from the
     corporation surviving the merger or resulting from the consolidation a
     statement setting forth the aggregate number of shares not voted in favor
     of the merger or consolidation and with respect to which demands for
     appraisal have been received and the aggregate number of holders of such
     shares. Such written statement shall be mailed to the stockholder within 10
     days after such stockholder's written request for such a statement is
     received by the surviving or resulting corporation or within 10 days after
     expiration of the period for delivery of demands for appraisal under
     subsection (d) hereof, whichever is later.

          (f) Upon the filing of any such petition by a stockholder, service of
     a copy thereof shall be made upon the surviving or resulting corporation,
     which shall within 20 days after such service file in the office of the
     Register in Chancery in which the petition was filed a duly verified list
     containing the names and addresses of all stockholders who have demanded
     payment for their shares and with whom agreements as to the value of their
     shares have not been reached by the surviving or resulting corporation. If
     the petition shall be filed by the surviving or resulting corporation, the
     petition shall be accompanied by such a duly verified list. The Register in
     Chancery, if so ordered by the Court, shall give notice of the time and
     place fixed for the hearing of such petition by registered or certified
     mail to the surviving or resulting corporation and to the stockholders
     shown on the list at the addresses therein stated. Such notice shall also
     be given by 1 or more publications at least 1 week before the day of the
     hearing, in a newspaper of general circulation published in the City of
     Wilmington, Delaware or such publication as the Court deems advisable. The
     forms of the notices by mail and by publication shall be approved by the
     Court, and the costs thereof shall be borne by the surviving or resulting
     corporation.

          (g) At the hearing on such petition, the Court shall determine the
     stockholders who have complied with this section and who have become
     entitled to appraisal rights. The Court may require the stockholders who
     have demanded an appraisal for their shares and who hold stock represented
     by certificates to submit their certificates of stock to the Register in
     Chancery for notation thereon of the pendency of the appraisal proceedings;
     and if any stockholder fails to comply with such direction, the Court may
     dismiss the proceedings as to such stockholder.

          (h) After determining the stockholders entitled to an appraisal, the
     Court shall appraise the shares, determining their fair value exclusive of
     any element of value arising from the accomplishment or expectation of the
     merger or consolidation, together with a fair rate of interest, if any, to
     be paid upon the amount determined to be the fair value. In determining
     such fair value, the Court shall take into account all relevant factors. In
     determining the fair rate of interest, the Court may consider all relevant
     factors, including the rate of interest which the surviving or resulting
     corporation would have had to pay to borrow money during the pendency of
     the proceeding. Upon application by the surviving or resulting corporation
     or by any stockholder entitled to participate in the appraisal proceeding,
     the Court may, in its discretion, permit discovery or other pretrial
     proceedings and may proceed to trial upon the appraisal prior to the final
     determination of the stockholder entitled to an appraisal. Any stockholder
     whose name appears on the list filed by the surviving or resulting
     corporation pursuant to subsection (f) of this section and who has
     submitted such stockholder's certificates of stock to the Register in
     Chancery, if such is required, may participate fully in all proceedings
     until it is finally determined that such stockholder is not entitled to
     appraisal rights under this section.

          (i) The Court shall direct the payment of the fair value of the
     shares, together with interest, if any, by the surviving or resulting
     corporation to the stockholders entitled thereto. Interest may be simple or
     compound, as the Court may direct. Payment shall be so made to each such
     stockholder, in the case of holders of uncertificated stock forthwith, and
     the case of holders of shares represented by certificates upon the
     surrender to the corporation of the certificates representing such stock.
     The Court's decree may be enforced as other decrees in the Court of
     Chancery may be enforced, whether such surviving or resulting corporation
     be a corporation of this State or of any state.

          (j) The costs of the proceeding may be determined by the Court and
     taxed upon the parties as the Court deems equitable in the circumstances.
     Upon application of a stockholder, the Court may order all or a portion of
     the



   91

     expenses incurred by any stockholder in connection with the appraisal
     proceeding, including, without limitation, reasonable attorney's fees and
     the fees and expenses of experts, to be charged pro rata against the value
     of all the shares entitled to an appraisal.

          (k) From and after the effective date of the merger or consolidation,
     no stockholder who has demanded appraisal rights as provided in subsection
     (d) of this section shall be entitled to vote such stock for any purpose or
     to receive payment of dividends or other distributions on the stock (except
     dividends or other distributions payable to stockholders of record at a
     date which is prior to the effective date of the merger or consolidation);
     provided, however, that if no petition for an appraisal shall be filed
     within the time provided in subsection (e) of this section, or if such
     stockholder shall deliver to the surviving or resulting corporation a
     written withdrawal of such stockholder's demand for an appraisal and an
     acceptance of the merger or consolidation, either within 60 days after the
     effective date of the merger or consolidation as provided in subsection (e)
     of this section or thereafter with the written approval of the corporation,
     then the right of such stockholder to an appraisal shall cease.
     Notwithstanding the foregoing, no appraisal proceeding in the Court of
     Chancery shall be dismissed as to any stockholder without the approval of
     the Court, and such approval may be conditioned upon such terms as the
     Court deems just.

          (l) The shares of the surviving or resulting corporation to which the
     shares of such objecting stockholders would have been converted had they
     assented to the merger or consolidation shall have the status of authorized
     and unissued shares of the surviving or resulting corporation.