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                                                                      EXHIBIT 4b
 
                      STATEMENT OF RESOLUTION ESTABLISHING
                                SERIES OF SHARES
 
                                   designated
 
               SERIES A 8% CUMULATIVE CONVERTIBLE PREFERRED STOCK
                                      and
               SERIES B 8% CUMULATIVE CONVERTIBLE PREFERRED STOCK
 
                                       of
 
                                   MESA INC.
 
To the Secretary of State
of the State of Texas:
 
     Pursuant to the provisions of Article 2.13D of the Texas Business
Corporation Act (the "TBCA"), and pursuant to Article IV of its Amended and
Restated Articles of Incorporation, the undersigned, MESA Inc., a corporation
organized and existing under the TBCA (the "corporation"), hereby submits the
following statement for the purpose of establishing and designating series of
its Preferred Stock, par value $.01, designated "Series A Cumulative Convertible
Preferred Stock" and "Series B Cumulative Convertible Preferred Stock" and
fixing and determining the relative rights and preferences thereof:
 
     I. The name of the corporation is MESA Inc.
 
     II. The following resolution establishing and designating series of shares
and fixing and determining the relative rights and preferences thereof, was duly
adopted by all necessary action on the part of the corporation, consisting of
due adoption by the Board of Directors of the corporation at a meeting held on
            , 1996.
 
          RESOLVED, that pursuant to the authority vested in the Board of
     Directors of the corporation ("Board of Directors") in accordance with
     provisions of its Amended and Restated Articles of Incorporation (the
     "Articles of Incorporation"), two series of Preferred Stock, par value $.01
     per share, of the corporation are hereby created, and that the designation
     and number of shares thereof and the preferences, limitations and relative
     rights thereof are as follows:
 
     SECTION 1. DESIGNATION, NUMBER OF SHARES AND STATED VALUE OF SERIES A
PREFERRED STOCK. There is hereby authorized and established a series of
Preferred Stock that shall be designated as "Series A 8% Cumulative Convertible
Preferred Stock" (hereinafter referred to as "Series A Preferred"), and the
number of shares constituting such series shall be 140,000,000, plus, at any
time, such number of shares of Series B Preferred as have been or are at such
time being converted to shares of Series A Preferred pursuant to Section 16
hereof. Such number of shares may be increased, but not decreased, by resolution
adopted by the majority of the full Board of Directors. The "Stated Value" per
share of the Series A Preferred shall be equal to $2.26.
 
     SECTION 2. DESIGNATION, NUMBER OF SHARES AND STATED VALUE OF SERIES B
PREFERRED STOCK. There is hereby authorized and established a series of
Preferred Stock that shall be designated as "Series B 8% Cumulative Convertible
Preferred Stock" (hereinafter referred to as "Series B Preferred"), and the
number of shares constituting such series shall be 140,000,000. Such number of
shares may be increased, but not decreased, by resolution adopted by the
majority of the full Board of Directors. The "Stated Value" per share of the
Series B Preferred shall be equal to $2.26.
 
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     SECTION 3. DEFINITIONS. In addition to the definitions set forth elsewhere
herein, the following terms shall have the meanings indicated:
 
     "Affiliate" means (i) with respect to any Person, any other Person that
directly or indirectly controls or manages, is controlled or managed by, or is
under common control or management with such Person, whether through the
ownership of equity interests, by contract or otherwise, and (ii) with respect
to any individual, in addition to any Persons specified in clause (i), the
spouse, any parent or any child of such individual and any trust for the benefit
of such individual, spouse, parent or child.
 
     "Average Gas Equivalent Price" shall mean for any Rolling 4 Quarter Period,
the average price received by the corporation during such period from sales of
oil and gas production, expressed on a natural gas equivalent basis per thousand
cubic feet ("Mcf") using a factor of 6 Mcf of natural gas per 1 barrel of
liquids, to be calculated as follows:
 
          (i) the aggregate revenues of the corporation and its consolidated
     subsidiaries during such Rolling 4 Quarter Period from sales of natural
     gas, natural gas liquids and oil and condensate produced (other than that
     used for fuel and shrinkage) and sold by the corporation and its
     consolidated subsidiaries, as reported in the corporation's consolidated
     financial statements, divided by,
 
          (ii) the sum of (A) the total volume, on an Mcf basis, of natural gas
     produced (other than that used for fuel and shrinkage) and sold by the
     corporation and its consolidated subsidiaries during such Rolling 4 Quarter
     Period, plus (B) the product of 6 times the total number of barrels of
     natural gas liquids, oil and condensate, produced (other than that used for
     fuel and shrinkage) and sold by the corporation and its consolidated
     subsidiaries during such Rolling 4 Quarter Period, as derived from the
     corporation's consolidated financial statements.
 
     "Business Day" shall mean any day other than a Saturday, Sunday or a day on
which banking institutions in Dallas, Texas are authorized or obligated by law
or executive order to close.
 
     "Closing Price" with respect to a particular security on any Trading Day
shall mean the last reported sales price, regular way, for such security on such
Trading Day, or, in case no sale takes place on such day, the average of the
closing bid and ask prices, regular way on such Trading Day, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if not listed or admitted to trading on the New York Stock Exchange, as reported
in the principal consolidated transaction reporting system with respect to
securities listed on the principal national securities exchange on which such
security is listed or admitted to trading or, if such security is not listed or
admitted to trading on any national securities exchange, the last quoted price
or, if not so quoted, the average of the high bid and low asked prices in the
over-the-counter market, as reported by the Nasdaq Stock Market or such other
system then in use, or, if on any such date such security is not quoted by any
such organization, the average of the closing bid and ask prices on such Trading
Day as furnished by a professional market maker making a market in such security
selected by the Board of Directors of the corporation. If on any such date no
market maker is making a market in such security, the fair value of such shares
on such date as determined in good faith by the Board of Directors shall be
used.
 
     "Common Stock" shall mean the common stock, par value $0.01 per share, of
the corporation.
 
     "Consolidated EBITDA" for any period, shall mean the consolidated net
income or loss of the corporation for such period determined in accordance with
GAAP, but excluding gains and losses not arising from operations (including,
without limitation, interest income, gains and losses from investments, gains
and losses from dispositions of oil and gas properties or other assets,
collections and settlements of claims and litigation, adjustments of contingency
reserves and other extraordinary and/or non-recurring gains and losses), plus,
to the extent the following have been deducted in determining such net income or
loss, interest expense, income taxes, depreciation, depletion and amortization
expense and impairment expense.
 
     "Conversion Price" shall mean the conversion price per share of Common
Stock into which the Series A Preferred and Series B Preferred is convertible,
as such conversion price may be adjusted pursuant to Section 10 hereof. The
initial Conversion Price will be $2.26.
 
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     "full Board of Directors" when used in reference to the corporation's Board
of Directors, means the total number of members of the Board of Directors as
fixed by, or in the manner provided in, the Articles of Incorporation and Bylaws
(without regard to any then existing vacancies), including, any members elected
by the holders of the Series B Preferred pursuant hereto.
 
     "Fixed Charge Coverage Ratio" shall mean as of the end of any Rolling 4
Quarter Period, the ratio of (i) the sum of (A) the Consolidated EBITDA for such
Rolling 4 Quarter Period, plus (B) one-third of gross operating rents paid
before sublease income as defined by Standard & Poor's Corporation ("Gross
Rents") , if any, for such period to (ii) the sum for such Rolling 4 Quarter
Period of (A) interest expense, both expensed and capitalized, of the
corporation and its consolidated subsidiaries for such period, plus (B)
one-third of Gross Rents for such period, plus (C) scheduled principal
amortization of indebtedness (including borrowed money and capitalized leases)
of the corporation and its consolidated subsidiaries.
 
     "GAAP" shall mean generally accepted accounting principles in the United
States of America from time to time.
 
     "Initial Partnership Affiliates" shall mean the Partnership, the Persons
that are partners of the Partnership as of the Original Issue Date of the Series
B Preferred and any of their respective Affiliates so long as they remain
Affiliates of the Partnership or such Persons.
 
     "Junior Securities" means the Common Stock or any other series of stock
issued by the corporation ranking junior as to the Series A Preferred and Series
B Preferred in payment of dividends or distributions or upon liquidation,
dissolution, or winding-up of the corporation.
 
     "Market Price" per share of Common Stock as of any date shall mean the
average of the daily Closing Prices for a period of twenty Trading Days ending
on such date.
 
     "Minimum Ownership Amount" shall mean at any time, ownership of (i) at
least 34,132,744 shares of Series B Preferred or (ii) such number of shares of
Common Stock and Underlying Common Stock which is at least equal to 15 percent
of the total number of shares of Common Stock and Underlying Common Stock
outstanding at such time. For purposes of this definition, ownership of shares
of Series B Preferred shall be considered to be ownership of the corresponding
shares of Underlying Common Stock.
 
     "Minimum Ownership Condition" shall be satisfied at any time if (i) the
Minimum Ownership Amount is owned in the aggregate at such time by one or more
of the Initial Partnership Affiliates, (ii) at least one half of the Minimum
Ownership Amount is owned and held in the aggregate at such time by one or more
of the Rainwater Affiliates, and (iii) the power to vote at least a majority of
the shares of Series B Preferred outstanding at such time is held by Rainwater
Affiliates, which shall be satisfied (A) with respect to any shares of Series B
Preferred owned by the Partnership if a Rainwater Affiliate is at such time the
sole general partner of the Partnership, (B) with respect to any shares owned by
a Rainwater Affiliate if at such time the right to vote such shares is not
shared with any Person who is not a Rainwater Affiliate, and (C) with respect to
any shares owned by a Person other than a Rainwater Affiliate, if at such time a
Rainwater Affiliate shall have the sole right to vote such shares pursuant to a
voting agreement, voting trust, irrevocable proxy or other similar agreement
with terms reasonably satisfactory to the corporation; provided that, the
corporation shall have been presented with appropriate certifications or other
documentation demonstrating that the foregoing requirements have been met.
 
     "Non-Series A and B Directors" shall mean the members of the Board of
Directors in whose election the holders of Common Stock are entitled to vote
(whether or not holders of shares of any other class or series are also entitled
to vote thereon).
 
     "Original Issue Date" shall mean with respect to the Series A Preferred or
Series B Preferred, as the case may be, the date on which shares of such series
are first issued.
 
     "Parity Security" means any class or series of stock issued by the
corporation ranking on a parity with the Series A Preferred and Series B
Preferred in payment of dividends or distributions or upon liquidation,
dissolution or winding-up of the corporation.
 
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     "Partnership" shall mean DNR-Mesa Holdings, L.P., a Texas limited
partnership.
 
     "Partnership Affiliates" shall mean the Partnership, its partners and their
respective Affiliates for so long as they remain Affiliates of the Partnership
or such partners.
 
     "Payable-in-Kind" or "Paid-in-Kind" when used in reference to any dividend
payable on the shares of Series A Preferred or Series B Preferred, means payment
of the dividend by issuance of that number of additional shares of Series A
Preferred or Series B Preferred, as the case may be, that has an aggregate
Stated Value equal to the dollar amount of such dividend then payable, rounded
to the nearest whole share (i.e. if less than .5 rounded down, and if .5 or more
rounded up). Shares of Series A Preferred or Series B Preferred issued as
dividends Payable-in-Kind shall be duly authorized, validly issued and
nonassessable and, upon issuance, shall have rights (including without
limitation, dividend, voting, conversion and redemption rights) identical to the
outstanding shares of Series A Preferred and Series B Preferred in respect of
which they are issued.
 
     "Person" means any individual, corporation, association, partnership, joint
venture, limited liability company, trust, estate, or other entity or
organization.
 
     "Rainwater Affiliates" shall mean, at any time, Richard E. Rainwater and
any of his Affiliates at such time. As of the date hereof, the Rainwater
Affiliates include, without limitation, Natural Gas Partners II, L.P. and
Natural Gas Partners III, L.P.
 
     "Rolling 4 Quarter Period" means the most recently ended period of four
consecutive fiscal quarters of the corporation prior to the date of
determination.
 
     "Senior Securities" means any class or series of stock issued by the
corporation ranking senior to the Series A Preferred and Series B Preferred in
payment of dividends or distributions or upon liquidation, dissolution, or
winding-up of the corporation.
 
     "Trading Day" with respect to any security means (i) if such security is
listed or admitted for trading on any national securities exchange, a day on
which such national securities exchange is open for trading, or (ii) if such
security is not listed or admitted to trading on any national securities
exchange, a Business Day.
 
     "Transfer Agent" means American Stock Transfer & Trust Corporation, or such
other agent or agents of the corporation as may be designated by the Board of
Directors as the transfer agent or conversion agent for the Series A Preferred
and Series B Preferred.
 
     "Underlying Common Stock" means at any time, with respect to any share of
Series A Preferred or Series B Preferred, the aggregate number of shares of
Common Stock into which such share is then convertible at such time pursuant to
Section 10 hereof.
 
     SECTION 4. DIVIDENDS AND DISTRIBUTIONS.
 
          (a) The holders of outstanding shares of Series A Preferred and Series
     B Preferred shall be entitled to receive, as and when declared by the
     corporation, out of funds of the corporation legally available for the
     payment of dividends, preferential quarterly dividends at the times and at
     the rates provided for in this Section 4. Dividends on shares of the Series
     A Preferred and Series B Preferred shall be cumulative and shall accrue
     from and including the date of issuance of such shares to and including the
     date on which such shares shall have been converted into Common Stock or
     redeemed pursuant to Section 7 hereof. Such dividends shall accrue whether
     or not there shall be (at the time such dividend becomes payable or at any
     other time) profits, surplus or other funds of the corporation legally
     available for the payment of dividends.
 
          (b) Dividends shall accrue on each outstanding share of Series A
     Preferred and Series B Preferred at the rate of eight percent (8%) per
     annum of the Stated Value (the "Dividend Rate") of such share. Dividends
     shall be payable quarterly, in arrears, as of the last Business Day of each
     December, March, June and September, commencing on September 30, 1996
     (each, a "Dividend Payment Date").
 
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          (c) During the period beginning on the Original Issue Date of the
     Series B Preferred and ending on the first Dividend Payment Date on or
     following the fourth anniversary thereof (the "Exclusive PIK Period"),
     dividends on outstanding shares of Series A Preferred and Series B
     Preferred shall be Payable-in-Kind. After the Exclusive PIK Period,
     dividends on the shares of Series A Preferred and Series B Preferred shall
     be Payable-in-Kind or, at the corporation's option, if the "Stock Price
     Threshold" (as defined in subsection (d) below) or the "Coverage Ratio or
     Gas Price Threshold" (as defined in subsection (e) below) is satisfied as
     of the record date for such dividend, payable in cash.
 
          (d) For purposes hereof, the "Stock Price Threshold" shall be
     satisfied as of a record date for a Dividend Payment Date after the
     Exclusive PIK Period if the average of the daily Closing Prices for the
     Common Stock during a period of ninety (90) consecutive Trading Days
     preceding the tenth day prior to such record date, was more than three
     times the Conversion Price then in effect. Once the Stock Price Threshold
     has been satisfied, it shall be deemed to remain satisfied on each
     subsequent quarterly Dividend Payment Date regardless of any subsequent
     changes in the price of the Common Stock.
 
          (e) For purposes hereof, the "Coverage Ratio or Gas Price Threshold"
     shall be satisfied as of a record date for a Dividend Payment Date if
     either (i) the Fixed Charge Coverage Ratio as of the end of the then most
     recently ended Rolling 4 Quarter Period is in excess of 2.5; or (ii) the
     Average Gas Equivalent Price realized by the corporation during the then
     most recently ended Rolling 4 Quarter Period is in excess of $2.95. As a
     condition to the payment of cash dividends on any Dividend Payment Date,
     the Coverage Ratio or Gas Price Threshold must be satisfied as of the
     record date for such quarterly Dividend Payment Date (unless the Stock
     Price Threshold has been satisfied, in which case satisfaction of the
     Coverage Ratio or Gas Price Threshold shall not be required).
 
          (f) The amount of dividends payable on each Dividend Payment Date
     shall be determined by applying the Dividend Rate from but excluding the
     immediately preceding Dividend Payment Date (or from but excluding the date
     of issuance of shares of Series A Preferred or Series B Preferred, with
     respect to the first dividend period) to and including the Dividend Payment
     Date.
 
          (g) Notwithstanding the foregoing or anything else herein to the
     contrary, however, (i) dividends payable on any Redemption Date (as defined
     in Section 7 below), shall be payable in cash or in Common Stock in
     accordance with Section 7 hereof, and (ii) dividends payable on any final
     distribution date relating to a dissolution, liquidation or winding up of
     the corporation, shall be payable in cash only. If the payment date does
     not occur on a regular Dividend Payment Date, dividends shall be calculated
     on the basis of the actual number of days elapsed from but excluding the
     immediately preceding Dividend Payment Date to and including the Redemption
     Date or such final distribution date. Dividends payable on the shares of
     Series A Preferred and Series B Preferred for any period of less than a
     full quarterly dividend period shall be computed on the basis of a 360-day
     year comprised of twelve 30-day months.
 
          (h) To the extent dividends are not paid in cash or Paid-in-Kind on a
     Dividend Payment Date, all dividends which shall have accrued on each share
     of Series A Preferred and Series B Preferred outstanding as of such
     Dividend Payment Date shall be added to the Stated Value of such share of
     Series A Preferred and Series B Preferred and shall remain a part thereof
     until paid, and dividends shall accrue at the Dividend Rate and be paid on
     such share of Series A Preferred and Series B Preferred on the basis of the
     Stated Value, as so adjusted.
 
          (i) Dividends payable on each Dividend Payment Date shall be paid to
     record holders of the shares of Series A Preferred and Series B Preferred
     as they appear on the books of the corporation at the close of business on
     the tenth Business Day immediately preceding the respective Dividend
     Payment Date or on such other record date as may be fixed by the Board of
     Directors of the corporation in advance of a Dividend Payment Date,
     provided that no such record date shall be less than ten nor more than
     sixty calendar days preceding such Dividend Payment Date.
 
          (j) So long as any shares of Series A Preferred or Series B Preferred
     are outstanding;
 
             (i) No dividend or other distribution shall be declared or paid, or
        set apart for payment on or in respect of, any Junior Securities (other
        than dividends or distributions payable in shares of Junior
 
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        Securities or in rights to purchase Junior Securities), nor shall any
        Junior Securities be redeemed, purchased or otherwise acquired for any
        consideration (or any money be paid to a sinking fund or otherwise set
        apart for the purchase or redemption of any such Junior Securities).
 
             (ii) No dividend or other distribution, except as described in the
        next succeeding sentence, shall be declared or paid, or set apart for
        payment on or in respect of, Series A Preferred or Series B Preferred or
        any Parity Securities for any period unless full cumulative dividends on
        all outstanding shares of Series A Preferred and Series B Preferred and
        any Parity Securities have been or contemporaneously are declared and
        paid for all dividend periods terminating on or prior to the date set
        for payment of such dividend. When dividends are not paid in full, as
        aforesaid, on the shares of Series A Preferred and Series B Preferred
        and any Parity Securities, all dividends declared upon such Parity
        Securities shall be declared and paid pro rata so that the amounts of
        dividends per share declared and paid on the shares of Series A
        Preferred and Series B Preferred and such Parity Securities shall in all
        cases bear to each other the same ratio that unpaid dividends per share
        on the Series A Preferred and Series B Preferred and on such Parity
        Securities bear to each other.
 
             (iii) No shares of Series A Preferred or Series B Preferred or any
        Parity Securities shall be redeemed, purchased or otherwise acquired for
        any consideration (or any money be paid to a sinking fund or otherwise
        set apart for the purchase or redemption of any such Parity Security) by
        the corporation unless the full cumulative dividends on all outstanding
        shares of Series A Preferred and Series B Preferred shall have been or
        contemporaneously are declared and paid for all dividend periods
        terminating on or prior to the date on which such redemption, purchase
        or other payment is to occur.
 
     SECTION 5. CERTAIN COVENANTS AND RESTRICTIONS. So long as any shares of
Series A Preferred or Series B Preferred are outstanding;
 
          (a) The corporation shall at all times reserve and keep available for
     issuance upon the conversion of the shares of Series A Preferred and Series
     B Preferred as provided in Section 7 and Section 10, respectively, such
     number of its authorized but unissued shares of Common Stock as will be
     sufficient to permit the conversion of all outstanding shares of Series A
     Preferred and Series B Preferred and all other securities and instruments
     convertible into shares of Common Stock, and shall take all reasonable
     action within its power required to increase the authorized number of
     shares of Common Stock necessary to permit the conversion of all
     outstanding shares of Series A Preferred and Series B Preferred and all
     such other securities and instruments convertible into shares of Common
     Stock.
 
          (b) The corporation covenants and agrees that all shares of Common
     Stock that may be issued as payment of the Redemption Price or upon
     exercise of the conversion rights of shares of Series A Preferred and
     Series B Preferred will, upon issuance, be fully-paid and nonassessable.
 
          (c) The corporation will endeavor to make the shares of stock that may
     be issued as payment of the Redemption Price or upon exercise of the
     conversion rights of shares of Series A Preferred and Series B Preferred
     eligible for trading upon any national securities exchange, or any
     automated quotation system of a registered securities association, upon or
     through which the Common Stock shall then be traded prior to such delivery.
 
          (d) Prior to the delivery of any securities which the corporation
     shall be obligated to deliver upon redemption or conversion of the Series A
     Preferred or Series B Preferred, the corporation will endeavor to comply
     with all federal and state securities laws and regulations thereunder
     requiring the registration of such securities with, or any approval of or
     consent to the delivery of such securities by, any governmental authority.
 
          (e) The corporation shall pay all taxes and other governmental charges
     (other than any income or franchise taxes) that may be imposed with respect
     to the issue or delivery of shares of Common Stock upon conversion or
     redemption of Series A Preferred or Series B Preferred as provided herein.
     The corporation shall not be required, however, to pay any tax or other
     charge imposed in connection with any transfer involved in the issue of any
     certificate for shares of Common Stock in any name other than that
 
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     of the registered holder of the shares of the Series A Preferred or Series
     B Preferred surrendered in connection with the conversion or redemption
     thereof, or involved in the issue of any certificate for shares of Series A
     Preferred in exchange for shares of Series B Preferred, and in such case
     the corporation shall not be required to issue or deliver any stock
     certificate until such tax or other charge has been paid, or it has been
     established to the corporation's satisfaction that no tax or other charge
     is due.
 
     SECTION 6. LIQUIDATION PREFERENCE.
 
          (a) In the event of any liquidation, dissolution, or winding-up of the
     corporation (in connection with the bankruptcy or insolvency of the
     corporation or otherwise), whether voluntary or involuntary, before any
     payment or distribution of the assets of the corporation (whether capital
     or surplus) shall be made to or set apart for the holders of shares of any
     Junior Securities, the holders of the shares of Series A Preferred and
     Series B Preferred shall be entitled to receive an amount per share equal
     to the Stated Value per share held by them, plus an amount in cash equal to
     the full cumulative dividends accrued and unpaid thereon, to the date of
     such payment, whether or not declared. No payment on account of any such
     liquidation, dissolution or winding-up of the corporation shall be paid to
     the holders of the shares of Series A Preferred or Series B Preferred or
     the holders of any Parity Securities unless there shall be paid at the same
     time to the holders of the shares of Series A Preferred and Series B
     Preferred and the holders of any Parity Securities proportionate amounts
     determined ratably in proportion to the full amounts to which the holders
     of all outstanding shares of Series A Preferred and Series B Preferred and
     the holders of all such outstanding Parity Securities are respectively
     entitled with respect to such distribution. For purposes of this Section 6,
     neither a consolidation or merger of the corporation with one or more
     partnerships, corporations or other entities nor a sale, lease, exchange or
     transfer of all or any substantial part of the corporation's assets for
     cash, securities or other property shall be deemed to be a liquidation,
     dissolution or winding-up of the corporation, whether voluntary or
     involuntary.
 
          (b) After payment of the full amount of the liquidation preference to
     which the holders of shares of Series A Preferred and Series B Preferred
     are entitled, such holders will not be entitled to any further
     participation in any distribution of assets of the corporation.
 
          (c) Written notice of any liquidation, dissolution or winding-up of
     the corporation, stating the payment date or dates when and the place or
     places where the amounts distributable in such circumstances shall be
     payable, shall be given by first class mail, postage prepaid, not less than
     15 days prior to any payment date stated therein, to the holders of record
     of the shares of Series A Preferred and Series B Preferred at their
     respective addresses as the same shall appear in the records of the
     corporation.
 
     SECTION 7. REDEMPTION. The outstanding shares of Series A Preferred and
Series B Preferred are subject to redemption in accordance with the following
provisions:
 
          (a) Subject to the terms hereof, the corporation may at its option
     elect to redeem outstanding shares of Series A Preferred and Series B
     Preferred, in whole or in part (pro-rata or by lot among the outstanding
     shares of both series), on any Dividend Payment Date after the thirtieth
     (30th) day following the tenth (10th) anniversary of the Original Issue
     Date of the Series B Preferred Stock.
 
          (b) On June 30, 2008, the corporation shall redeem all of the shares
     of Series A Preferred and Series B Preferred outstanding on such date.
 
          (c) The redemption price per share for Series A Preferred and Series B
     Preferred redeemed on any optional or mandatory redemption date (the
     "Redemption Price") shall be equal to the Stated Value per share of the
     shares to be redeemed plus an amount equal to the aggregate dollar amount
     of all accrued and unpaid dividends through the redemption date that have
     not been added to the Stated Value of such shares. The Redemption Price
     shall be paid in cash from any source of funds legally available therefor,
     unless the corporation shall publicly announce at least 30 days prior to
     the redemption date that it has elected to make payment of the Redemption
     Price in Common Stock, in which case the Redemption Price shall be payable
     in Common Stock. If the corporation elects to pay the Redemption Price in
     shares of Common Stock, the number (or fraction) of shares to be issued in
     payment of the Redemption Price
 
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     shall be calculated based on the Market Price per share of Common Stock as
     of the fifth Trading Day before the redemption date.
 
          (d) Not less than thirty nor more than sixty days prior the redemption
     date, a notice specifying the time and place of such redemption shall be
     given by first class mail, postage prepaid, to the holders of record of the
     shares of Series A Preferred and Series B Preferred to be redeemed at their
     respective addresses as the same shall appear on the books of the
     corporation (but no failure to mail such notice or any defect therein shall
     affect the validity of the proceedings for redemption except as to the
     holder to whom the corporation has failed to mail such notice or except as
     to the holder whose notice was defective), calling upon each such holder of
     record to surrender to the corporation on the redemption date at the place
     designated in such notice such holder's certificate or certificates
     representing the then outstanding shares of Series A Preferred or Series B
     Preferred held by such holder. On or after the Redemption Date, each holder
     of shares of Series A Preferred and Series B Preferred called for
     redemption shall surrender his certificate or certificates for such shares
     to the corporation at the place designated in the redemption notice and
     shall thereupon be entitled to receive payment of the Redemption Price in
     the manner set forth in Section 7(a) above. If the redemption is delayed
     for any reason, dividends shall continue to accrue on the shares of Series
     A Preferred and Series B Preferred outstanding, and shall be added to and
     become a part of the Redemption Price of such shares, until the Redemption
     Price, as so adjusted, for such shares is paid in full.
 
          (e) If a holder of shares of Series A Preferred or Series B Preferred
     called for redemption shall have elected, in accordance with the provisions
     of Section 10(b), to convert such shares into Common Stock, such shares of
     Series A Preferred or Series B Preferred which are to be converted into
     Common Stock shall no longer be subject to redemption, and conversion of
     same shall occur in accordance with the terms of Section 10.
 
     SECTION 8. SHARES TO BE RETIRED. All shares of Series A Preferred and
Series B Preferred repurchased, redeemed, converted or otherwise acquired by the
corporation shall be retired and cancelled and shall be restored to the status
of authorized but unissued shares of Preferred Stock, without designation as to
series, and may thereafter be reissued.
 
     SECTION 9. VOTING RIGHTS.
 
          (a) Except as otherwise provided in this Section 9 or required by law
     or any provision of the Articles of Incorporation of the corporation, the
     holders of the shares of Series A Preferred and Series B Preferred shall
     vote together with the shares of Common Stock as a single class at any
     annual or special meeting of shareholders of the corporation upon the
     following basis: each holder of shares of Series A Preferred and Series B
     Preferred shall be entitled to such number of votes for the shares of
     Series A Preferred and Series B Preferred held by such holder on the record
     date fixed for such meeting as shall be equal to the whole number of shares
     of Underlying Common Stock for such shares of Series A Preferred and Series
     B Preferred immediately after the close of business on the record date
     fixed for such meeting.
 
          (b) With respect to any matter for which the affirmative vote of the
     holders of separate classes or series of the corporation's capital stock is
     required by the TBCA, the holders of Series A Preferred and Series B
     Preferred shall, except as provided in this Section 9 or required by law,
     vote together as a single class with respect to such matter and the holders
     of the shares of Series A Preferred and Series B Preferred shall not be
     entitled to vote as a separate class or series apart from each other,
     including, without limitation, any vote on a proposal to approve or adopt
     (i) any plan of merger, consolidation or share exchange for which the TBCA
     requires a shareholder vote; (ii) any disposition of assets for which the
     TBCA requires a shareholder vote; and (iii) any dissolution of the
     corporation for which the TBCA requires a shareholder vote.
 
          (c) For so long as any shares of Series A Preferred or Series B
     Preferred remain outstanding, the corporation shall not: (i) without the
     affirmative vote or consent of the holders of a majority of the shares of
     Series A Preferred and Series B Preferred voting together as a single
     class: (x) authorize, create or issue, or increase the authorized or issued
     amount of, any class or series of stock of Senior Securities or
 
                                        8
   9
 
     Parity Securities, or any security convertible into or exchangeable for
     Senior Securities or Parity Securities or reclassify or modify any Junior
     Securities so as to become Parity Securities or Senior Securities; provided
     that if the Series A Preferred and Series B Preferred are affected
     differently by such action, the holders of each series will vote as a
     separate class; or (y) amend the Articles of Incorporation to eliminate
     cumulative voting; or (ii) without the affirmative vote or consent of the
     holders of two-thirds of the shares of Series A Preferred voting as a
     separate class, adopt any amendment to the Articles of Incorporation or the
     bylaws that would materially affect the terms of the Series A Preferred; or
     (iii) without the affirmative vote or consent of the holders of at least a
     majority of the shares of Series B Preferred voting as a separate class,
     adopt any amendment to the Articles of Incorporation or the Bylaws that
     would materially affect the terms of the Series B Preferred.
 
          (d) For so long as any shares of Series B Preferred remain
     outstanding, the affirmative vote or consent of the holders of at least a
     majority of the shares of Series B Preferred outstanding at the time shall
     be necessary to permit, affect or validate the amendment, alteration or
     repeal by the shareholders of any provisions of the Articles of
     Incorporation (including the Statement of Resolution relating to the Series
     A Preferred and Series B Preferred) or Bylaws of the corporation that would
     limit the authority of the Board of Directors to amend or repeal any
     provision of the corporation's Bylaws.
 
          (e) For so long as any shares of Series B Preferred remain outstanding
     and the Minimum Ownership Condition is met, the holders of the Series B
     Preferred shall have, in addition to the other voting rights required by
     law or set forth herein or in the corporation's Articles of Incorporation,
     the exclusive right, voting separately as a single class, to elect the
     minimum number of directors (such directors are referred to herein as the
     "Series B Directors") necessary to constitute a majority of the full Board
     of Directors of the corporation (excluding in any such calculation any
     Series A Directors). As of the Original Issue Date for the Series B
     Preferred, the holders of the Series B Preferred shall have the right to
     elect four of the seven members of the corporation's Board of Directors.
     The right to elect the Series B Directors pursuant hereto may be exercised
     by written consent in accordance with subsection (j) of this Section 9 or
     by vote at any annual or special meeting of shareholders held for the
     purpose of electing directors. At elections for the Series B Directors,
     each holder of Series B Preferred shall be entitled to one vote for each
     share held.
 
          (f) The Series B Directors elected as provided herein shall serve
     until the next annual meeting or until their respective successors shall be
     elected and shall qualify. Any Series B Director may be removed with or
     without cause by, and shall not be removed other than by, the vote of the
     holders of a majority of the outstanding shares of Series B Preferred,
     voting separately as a class, at a meeting called for such purpose or by
     written consent in accordance with subsection (j) hereof. If the office of
     any Series B Director becomes vacant by reason of death, resignation,
     retirement, disqualification or removal from office or otherwise, the
     remaining Series B Directors, by majority vote, may elect a successor, or,
     alternatively, the holders of a majority of the outstanding shares of
     Series B Preferred, voting separately as a class, at a meeting called for
     such purpose or by written consent in accordance with subsection (k) hereof
     may elect a successor. Any such successor shall hold office for the
     unexpired term in respect of which such vacancy occurred. Upon any
     termination of the right of the holders of Series B Preferred to vote for
     and elect Series B Directors as herein provided (i) the Series B Directors
     then serving on the Board of Directors may continue to hold their office
     for the remainder of their term, subject to the right of the majority of
     the Non-Series A and B Directors to request their prior resignation, in
     which case the Series B Directors shall resign upon such request, and (ii)
     upon the expiration of the term of office or earlier resignation of each
     Series B Director pursuant to this sentence, the number of members
     constituting the corporation's Board of Directors shall automatically be
     reduced accordingly unless a majority of the directors other than the
     Series B Directors by resolution determine otherwise and elect additional
     directors to fill any resulting vacancies.
 
          (g) The following special voting provisions shall be applicable to the
     Series A Preferred Stock:
 
             (i) if the corporation shall be in arrears in the payment of
        dividends (whether Payable-in-Kind or in cash) on the shares of Series A
        Preferred and Series B Preferred for a total of six quarterly
 
                                        9
   10
 
        Divided Payment Dates, then the number of members of the Board of
        Directors shall automatically be increased by two additional directors
        and the holders of the Series A Preferred, voting as a separate class,
        shall have the exclusive right to elect two directors ("Series A
        Directors") immediately, and at the next and every subsequent annual
        meeting of shareholders called for the election of directors, at which
        the term of office of the Series A Directors expire;
 
             (ii) the right of the holders of Series A Preferred to elect the
        Series A Directors as aforesaid shall continue until such time as
        dividends accumulated on the Series A Preferred shall have been paid in
        full, whether Payable-in-Kind or in cash, at which time the office of
        the Series A Directors shall be eliminated and the special right of the
        holders of Series A Preferred so to vote separately as a class for the
        election of the Series A Directors shall terminate, subject to revesting
        at such time as the corporation shall be in arrears in the payment of
        dividends on the outstanding shares of Series A Preferred as set forth
        in clause (i) above;
 
             (iii) each Series A Director shall agree, prior to his election to
        office, to resign immediately upon any termination of the right of the
        holders of Series A Preferred to vote as a separate class for directors
        as herein provided, and upon any such termination, each Series A
        Director shall forthwith resign and the size of the Board of Directors
        shall automatically be reduced accordingly;
 
             (iv) unless otherwise required to resign as aforesaid, the term of
        office of each Series A Director shall terminate upon the election of a
        successor Series A Director at any meeting of the shareholders held for
        the purpose of electing directors; and
 
             (v) in any case in which the holders of Series A Preferred shall be
        entitled to vote pursuant to this Section 9(g), each holder of Series A
        Preferred shall be entitled to one vote for each share of Series A
        Preferred held.
 
          (h) During any period in which the holders of Series A Preferred shall
     be entitled to elect directors pursuant to subsection (g) of this Section
     9, or the holders of Series B Preferred shall be entitled to elect
     directors pursuant to subsection (e) of this Section 9 the following shall
     be applicable:
 
             (i) if the annual meeting of shareholders of the corporation is
        not, for any reason, held within the time fixed in the Bylaws of the
        corporation, or if a vacancy shall exist in the office of a Series A
        Director or a Series B Director, a proper officer of the corporation,
        upon the written request of the holders of record of at least ten
        percent (10%) of the shares of the Series A Preferred or Series B
        Preferred then outstanding, as applicable, addressed to the Secretary of
        the corporation, shall call a special meeting in lieu of the annual
        meeting of shareholders, or in the event of a vacancy, a special meeting
        of the holders of Series A Preferred or Series B Preferred, as
        applicable, for the purpose of electing Series A Directors or Series B
        Directors, as applicable, and any such meeting shall be held at the
        earliest practicable date at such time and place as shall be determined
        by the corporation;
 
             (ii) if such meeting shall not be called by the proper officer of
        the corporation within twenty (20) days after personal service of said
        written request upon the Secretary of the corporation, or within (20)
        days after mailing the same within the United States by certified mail,
        addressed to the Secretary of the corporation at its principal executive
        offices, then the holders of record of at least ten percent (10%) of the
        outstanding shares of the Series A Preferred or Series B Preferred, as
        applicable, may designate in writing one of their number to call such
        meeting at the expense of the corporation, and such meeting may be
        called by the person so designated upon the notice required for the
        annual meetings of shareholders of the corporation and shall be held at
        the principal executive offices of the corporation. Any holder of Series
        A Preferred or Series B Preferred, as applicable, so designated shall
        have access to the lists of Series A Preferred or Series B Preferred
        shareholders to be called pursuant to the provisions hereof; and
 
             (iii) at any meeting held for the purpose of electing a director at
        which the holders of Series A Preferred or Series B Preferred shall have
        the right, voting as a separate class, to elect the Series A Director or
        Series B Director pursuant to this Section 9, the presence in person or
        by proxy of the holders of at least one-third ( 1/3) of the outstanding
        Series A Preferred or Series B Preferred, as
 
                                       10
   11
 
        applicable, shall be required to constitute a quorum of such Series A
        Preferred or Series B Preferred, as applicable.
 
          (i) During any period in which the holders of Series B Preferred shall
     be entitled to elect directors pursuant to subsection (e) of this Section
     9, (i) the holders of Series B Preferred shall not have the right or
     otherwise be entitled to vote in the election of any directors other than
     the Series B Directors, (ii) no Series B Director shall have the right to
     vote in the election of any person to fill any vacancy created by the
     death, resignation, retirement, disqualification or removal from office or
     otherwise of any director other than a Series B Director and all such
     rights with respect to the Non-Series A and B Directors shall be exercised
     for and on behalf of the Board of Directors by a majority of the Non-Series
     A and B Directors, and (iii) only the Non-Series A and B Directors shall
     have right to vote in any action by or on behalf of the Board of Directors
     with respect to nominating persons to serve as Non-Series A and B Directors
     to be elected at any meeting of shareholders that is held after the first
     meeting of shareholders at which Non-Series A and B Directors are elected
     that is held after the Original Issue Date of the Series B Preferred. The
     persons to be nominated by or on behalf of the Board of Directors for
     election as Non-Series A and B Directors at such first meeting of
     shareholders to be held after such Original Issue Date shall be such
     persons as shall have most recently been designated as such nominees by
     action of the Board of Directors prior to such Original Issue Date (or, if
     any of such nominees shall be unable or unwilling to serve, such other
     person or persons as shall be designated by the other such nominee or
     nominees), unless otherwise agreed after such date by the unanimous vote of
     all Non-Series A and B Directors then in office. Nothing in clause (ii) or
     (iii) above of this subsection (i), or in the immediately preceding
     sentence, shall limit or restrict the right of holders of shares of Common
     Stock and Series A Preferred to nominate and to elect, subject to and in
     accordance with applicable law, the other provisions of the Articles of
     Incorporation and the bylaws, persons to serve as Non-Series A and B
     Directors. This subsection (i) and the defined terms used herein may not be
     amended without (x) the affirmative vote of the holders of a majority of
     the outstanding shares of Common Stock and (y) the affirmative vote of the
     holders of a majority of the outstanding shares of Series A Preferred
     Stock.
 
          (j) Pursuant to Article 9.10A of the TBCA, any action of the holders
     of the Series B Preferred, voting as a separate class, which is required by
     the TBCA to be taken at any annual or special meeting of the holders of the
     Series B Preferred, or is otherwise permitted to be taken by the holders of
     Series B Preferred at any annual or special meeting pursuant to the TBCA,
     the Articles of Incorporation (including the Statement of Resolution
     relating to the Series A Preferred and Series B Preferred) or the
     corporation's bylaws, may be taken without a meeting, without prior notice,
     and without a vote, if a consent or consents in writing, setting forth the
     action so taken, shall be signed by the holder or holders of shares of
     Series B Preferred having not less than the minimum number of votes that
     would be necessary to take such action at a meeting at which the holders of
     all shares of Series B Preferred were present and voted.
 
     SECTION 10. CONVERSION RIGHTS. Holders of shares of Series A Preferred and
Series B Preferred shall have the right to convert all or a portion of such
shares into shares of Common Stock, as follows:
 
          (a) Subject to and upon compliance with the provisions of this Section
     10, each share of Series A Preferred and Series B Preferred shall be
     convertible at the option of the holder thereof into fully paid,
     nonassessable shares of Common Stock. The number (or fraction) of shares of
     Common Stock deliverable upon conversion of one share of Series A Preferred
     or Series B Preferred shall be determined by dividing the Stated Value of
     such share of Series A Preferred or Series B Preferred by the Conversion
     Price then in effect. For purpose of such determination, the Stated Value
     of each share of Series A Preferred or Series B Preferred shall be
     increased by the amount of accrued and unpaid dividends for all quarterly
     dividend payment periods ending on or prior to the date such shares are
     surrendered to the corporation for conversion and for the partial dividend
     period beginning on the date immediately following the most recent Dividend
     Payment Date through and including the date on which such shares are
     surrendered for conversion. Notwithstanding the foregoing, holders of
     shares of Series A Preferred and Series B Preferred surrendered for
     conversion shall have the right to require the corporation to make
 
                                       11
   12
 
     payment in cash of all such accrued and unpaid dividends, in lieu of such
     adjustment to the Stated Value to the extent funds are legally available
     therefor.
 
          (b) The conversion of any share of Series A Preferred or Series B
     Preferred may be effected by the holder thereof by the surrender of the
     certificate for such share to the corporation at the principal office of
     the Transfer Agent or to such other agent or agents of the corporation as
     may be designated by the Board of Directors. If any shares of Series A
     Preferred or Series B Preferred are called for redemption pursuant to
     Section 7 hereof, such right of conversion shall cease and terminate as to
     the shares called for redemption at the close of business on the Business
     Day immediately preceding the redemption date, unless the corporation shall
     default in the payment of the Redemption Price, in which event such
     conversion right shall remain in effect until full payment of the
     Redemption Price has been made.
 
          (c) As promptly as practicable after the surrender of shares of Series
     A Preferred and Series B Preferred for conversion, the corporation shall
     issue and deliver or cause to be issued and delivered to the holder of such
     shares certificates representing the number (or fraction) of fully paid and
     non-assessable shares of Common Stock into which such shares of Series A
     Preferred and Series B Preferred have been converted in accordance with the
     provisions of this Section 10. Subject to the following provisions of this
     Section 10, such conversion shall be deemed to have been made as of the
     close of business on the date on which the shares of Series A Preferred and
     Series B Preferred shall have been surrendered for conversion in the manner
     herein provided, so that the rights of the holder of the shares of Series A
     Preferred and Series B Preferred so surrendered shall cease at such time,
     and the person or persons entitled to receive the shares of Common Stock
     upon conversion thereof shall be treated for all purposes as having become
     the record holder or holders of such shares of Common Stock at such time;
     provided, however, that any such surrender on any date when the stock
     transfer books of the corporation are closed shall be deemed to have been
     made, and shall be effective to terminate the rights of the holder or
     holders of the shares of Series A Preferred and Series B Preferred so
     surrendered for conversion and to constitute the person or persons entitled
     to receive such shares of Common Stock as the record holder or holders
     thereof for all purposes, at the opening of business on the next succeeding
     day on which such transfer books are open and such conversion shall be at
     the Conversion Price in effect at such time.
 
          (d) Before taking any action which would cause an adjustment reducing
     the Conversion Price below the then par value of the shares of Common Stock
     deliverable upon conversion of the shares of Series A Preferred and Series
     B Preferred, the corporation will take any corporate action which may, in
     the opinion of its counsel, be necessary in order that the corporation may
     validly and legally issue fully paid and non-assessable shares of Common
     Stock at such adjusted Conversion Price.
 
          (e) The Conversion Price shall be subject to adjustment from time to
     time as follows:
 
             (i) In case at any time the corporation shall (A) subdivide the
        outstanding shares of Common Stock into a greater number of shares, or
        (B) combine the outstanding shares of Common Stock into a smaller number
        of shares, the Conversion Price in effect immediately prior thereto
        shall be adjusted proportionately so that the adjusted Conversion Price
        shall bear the same relation to the Conversion Price in effect
        immediately prior to such event as the total number of shares of Common
        Stock outstanding immediately prior to such event shall bear to the
        total number of shares of Common Stock outstanding immediately after
        such event. Such adjustment shall become effective immediately after the
        effective date of a subdivision or combination.
 
             (ii) In case at any time the corporation shall declare, order, pay
        or make any dividend or other distribution to holders of the Common
        Stock payable in Common Stock, then in each such case, subject to
        Section 10(e)(v) hereof, the Conversion Price in effect immediately
        prior to the close of business on the record date fixed for
        determination of holders of any class of securities entitled to receive
        such dividend or distribution shall be reduced to a price (calculated to
        the nearest .001 of cent) determined by multiplying such Conversion
        Price by a fraction:
 
                (A) the numerator of which shall be the number of shares of
           Common Stock outstanding immediately prior to such dividend or
           distribution; and
 
                                       12
   13
 
                (B) the denominator of which shall be the number of shares of
           Common Stock outstanding immediately after such dividend or
           distribution.
 
        Shares of Common Stock owned by or held for the account of the
        corporation shall not be deemed outstanding for the purpose of any such
        computation. Such adjustment shall be made on the date such dividend is
        paid or such distribution is made and shall become effective retroactive
        to the record date for the determination of shareholders entitled to
        receive such dividend or distribution.
 
             (iii) In case at any time the corporation shall declare, order, pay
        or make any dividend or other distribution to all holders of the Common
        Stock, other than a dividend payable in shares of Common Stock
        (including, without limitation, dividends or distributions payable in
        cash, evidences of indebtedness, rights, options or warrants to
        subscribe or purchase any Common Stock or other securities, or any other
        securities or other property, but excluding any rights to purchase any
        stock or other securities if such rights are not separable from the
        Common Stock except upon the occurrence of a contingency beyond the
        control of the corporation), then, and in each such case, subject to
        Section 10(e)(v) hereof, the Conversion Price in effect immediately
        prior to the close of business on the record date fixed for the
        determination of holders of Common Stock entitled to receive such
        dividend or distribution shall be reduced to a price (calculated to the
        nearest .001 of a cent) determined by multiplying such Conversion Price
        by a fraction:
 
                (A) the numerator of which shall be the Market Price per share
           of Common Stock in effect as of such record date or, if the Common
           Stock trades on an ex-dividend basis, on the Trading Day immediately
           prior to the date of commencement of ex-dividend trading, less the
           value of such dividend or distribution (as determined in good faith
           by the Board of Directors of the corporation) applicable to one share
           of Common Stock, and
 
                (B) the denominator of which shall be such Market Price per
           share of Common Stock as of such record date or, if the Capital Stock
           trades on an ex-dividend basis, on the Trading Day immediately prior
           to the date of commencement of ex-dividend trading.
 
        Such adjustment shall be made on the date such dividend is paid or such
        distribution is made and shall become effective retroactive to the
        record date for the determination of shareholders entitled to receive
        such dividend or distribution.
 
             (iv) In case at any time the corporation issues or sells any shares
        of Common Stock or any rights, options or warrants to subscribe for or
        purchase shares of Common Stock or shares having the same rights,
        privileges and preferences as the Common Stock ("equivalent common
        stock") or securities convertible into Common Stock or equivalent common
        stock, at a price per share of Common Stock or equivalent common stock
        (or having a conversion price per share, if a security is convertible
        into shares of Common Stock or equivalent common stock) less than the
        Market Price of the Common Stock as of the date of such issue or sale,
        then upon such issue or sale the Conversion Price shall be reduced to
        such Conversion Price determined by multiplying the Conversion Price in
        effect immediately prior to such issue or sale by a fraction, (x) the
        numerator of which shall be the sum of the number of shares of Common
        Stock outstanding immediately prior to such issue or sale plus the
        number of shares of Common Stock which the aggregate offering price of
        the total number of shares of Common Stock and/or equivalent common
        stock so to be offered (and/or the aggregate initial conversion price of
        the convertible securities so to be offered) would purchase at such
        Market Price and (y) the denominator of which shall be the sum of the
        number of shares of Common Stock outstanding immediately prior to such
        issue or sale plus the number of additional shares of Common Stock
        and/or equivalent common stock to be offered for subscription or
        purchase (or into which the convertible securities so to be offered are
        initially convertible). In case such subscription price may be paid in a
        consideration part of or all of which shall be in a form other than
        cash, the value of such consideration shall be determined in good faith
        by the Board of Directors of the corporation. Shares of Common Stock
        owned by or held for the account of the corporation shall not be deemed
        outstanding for the purpose of any such computation. Such issue or sale
        adjustment shall be made successively upon the issuance or sale of
        shares of Common Stock or
 
                                       13
   14
 
        equivalent common stock or any rights, options or warrants to subscribe
        for or purchase Common Stock or equivalent common stock or securities
        convertible into common stock or equivalent common stock.
        Notwithstanding the foregoing, no adjustment of the Conversion Price
        pursuant to this Section 10(e)(iv) shall be made upon (A) the conversion
        or redemption of shares of Series A Preferred or Series B Preferred; (B)
        the payment of any stock dividend on the Series A Preferred or Series B
        Preferred; (C) the issuance of options to officers, directors and
        employees of the corporation and its subsidiaries, to purchase shares of
        Common Stock, including any such options as are issued and outstanding
        as of the Original Issue of the Series B Preferred; (D) the issuance and
        sale of Common Stock upon exercise of any rights, options or warrants
        referenced in the immediately preceding clause (C) or in Section
        10(e)(iii); or (E) the issuance and sale of Common Stock in an
        underwritten public offering at a price to the public of not less than
        95% of the Closing Price of the Common Stock on the date of the pricing
        of such offering.
 
             (v) If the amount of any adjustment of the Conversion Price
        required pursuant to this Paragraph 10 would be less than 1% of the
        Conversion Price in effect at the time such adjustment is otherwise so
        required to be made, such amount shall be carried forward and an
        adjustment with respect thereto made at the time of and together with
        any subsequent adjustment which, together with such amount and any other
        amount or amounts so carried forward, shall aggregate at least 1% of
        such Conversion Price. All calculations under this Section 10 shall be
        made to the nearest .001 of a cent.
 
             (vi) Except as herein otherwise expressly provided, for all
        purposes of this Section 10(e) the term "Common Stock" shall mean the
        Common Stock and any shares of stock or other class of capital stock of
        the corporation which is not preferred as to dividends or assets over
        any other class of capital stock of the corporation and which is not
        subject to redemption, or which is issued to the holders of shares of
        Common Stock upon any reclassification thereof.
 
          (f) In case at any time after the Original Issuance Date, the
     corporation shall be a party to any transaction (including without
     limitation, a merger, consolidation, statutory share exchange, sale of all
     or substantially all of the corporation's assets or recapitalization of the
     Common Stock), in each case as a result of which shares of Common Stock (or
     any other securities of the corporation then issuable upon conversion of
     the Series A Preferred or Series B Preferred) shall be converted to the
     right to receive stock, securities or other property (including cash or any
     combination thereof) (each of the foregoing transactions being referred to
     as a "Fundamental Change Transaction"), then the shares of Series A
     Preferred and Series B Preferred remaining outstanding will thereafter no
     longer be subject to conversion into Common Stock (or such other
     securities) pursuant to this Section 10, but instead each share shall be
     convertible into the kind and amount of stock and other securities and
     property receivable (including cash) upon the consummation of such
     Fundamental Change Transaction by a holder of that number of shares or
     fraction thereof of Common Stock (or such other securities) into which one
     share of Series A Preferred or Series B Preferred was convertible
     immediately prior to such Fundamental Change Transaction assuming such
     holder of Common Stock failed to exercise any right of election as to the
     kind of consideration to be received in such Fundamental Change
     Transaction. The corporation shall not be a party to any Fundamental Change
     Transaction after which shares of the Series A Preferred and Series B
     Preferred shall remain outstanding unless the terms of such Fundamental
     Change Transaction are consistent with the provisions of this Section
     10(f), and it shall not consent or agree to the occurrence of any such
     Fundamental Change Transaction until the corporation has entered into an
     agreement with the successor or purchasing entity, as the case may be, for
     the benefit of the holders of the shares of Series A Preferred and Series B
     Preferred which will contain provisions enabling the holders of shares of
     the Series A Preferred and Series B Preferred which remain outstanding
     after such Fundamental Change Transaction to convert such shares into the
     consideration received by holders of Common Stock (or any other securities
     of the corporation then issuable upon conversion of the Series A Preferred
     or Series B Preferred) at the Conversion Price immediately after such
     Fundamental Change Transaction. In the event that at any time, as a result
     of an adjustment made pursuant to this Section 10, the Series A Preferred
     and Series B Preferred shall become subject to conversion into any
     securities other than shares
 
                                       14
   15
 
     of Common Stock, thereafter the number of such other securities so issuable
     upon conversion of the shares of Series A Preferred and Series B Preferred
     shall be subject to adjustment from time to time in a manner and on terms
     nearly equivalent as practicable to the provisions with respect to the
     shares of Series A Preferred and Series B Preferred contained in this
     Section 10. The provisions of this Section 10(f) shall similarly apply to
     successive Fundamental Change Transactions.
 
          (g) Upon the occurrence of any event requiring an adjustment of the
     Conversion Price, then and in any such case the corporation shall promptly
     deliver to the holders of shares of Series A Preferred and Series B
     Preferred, a notice stating the Conversion Price resulting from such
     adjustment, the method of calculation thereof, and setting forth a brief
     statement of the facts requiring such adjustment and upon which such
     adjustment is based.
 
          (h) In case at any time:
 
             (i) the corporation shall declare or pay to all holders of Common
        Stock any dividend (whether payable in Common Stock, cash, securities or
        other property);
 
             (ii) there shall be any capital reorganization, or reclassification
        of the Common Stock of the corporation or consolidation or merger of the
        corporation with, or sale of all or substantially all of its assets to,
        another corporation or other entity;
 
             (iii) there shall be a voluntary or involuntary dissolution,
        liquidation, or winding-up of the corporation; or
 
             (iv) there shall be any other Fundamental Change Transaction;
 
     then, in any one or more of such cases, the corporation shall give to the
     holder of shares of Series A Preferred and Series B Preferred (A) at least
     15 days prior to any event referred to in clause (i) above and at least 30
     days prior to any event referred to in clause (ii), (iii) or (iv) above,
     written notice of the date on which the books of the corporation shall
     close or records shall be taken for such dividend or distribution or for
     determining rights to vote in respect of any such organization,
     reclassification, consolidation, merger, sale, dissolution, liquidation,
     winding-up, or Fundamental Change Transaction and (B) in the case of any
     such reorganization, reclassification, consolidation, merger, sale,
     dissolution, liquidation, winding-up, or Fundamental Change Transaction
     known to the corporation, at least 30 days prior written notice of the
     date, or if not then known, a reasonable approximation thereof by the
     corporation) when the same shall take place. Such notice in accordance with
     the foregoing clause (A) shall also specify, in the case of any such
     dividend or distribution, the date on which such holders of Common Stock
     shall be entitled thereto, and such notice in accordance with the foregoing
     clause (B) shall also specify the date on which such holders of Common
     Stock shall be entitled to exchange their Common Stock securities or other
     property deliverable upon such reorganization, reclassification,
     consolidation, merger, sale, dissolution, liquidation, winding-up, or
     Fundamental Change Transaction, as the case may be.
 
          (i) All shares of Common Stock issuable upon the conversion set forth
     in this Section 10 shall be validly issued, fully-paid and non-assessable.
 
     SECTION 11. RANKING.
 
          (a) The Series A Preferred and the Series B Preferred shall rank on a
     parity with each other as to payment of dividends and distributions and
     upon liquidation, dissolution or winding-up of the corporation. In the
     event the corporation is a party to any merger, consolidation or share
     exchange in which the Series A Preferred or Series B Preferred is converted
     or exchanged into any other securities, property, cash or other
     consideration, the securities, property, cash or other consideration into
     which the Series A Preferred and Series B Preferred, respectively, may be
     converted or exchanged shall be identical in kind and amount per share as
     that into which the Series B Preferred or Series A Preferred, as the case
     may be, may be converted or exchanged, and no shares of Series A Preferred
     or Series B Preferred shall be converted or exchanged therein into any
     securities, property, cash or other consideration unless all shares
 
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     of Series A Preferred and Series B Preferred may be converted or exchanged
     into the same kind and amount per share of securities, property, cash or
     other consideration.
 
          (b) Without limiting the definition of Junior Securities, the
     following securities and obligations of the corporation shall rank junior
     to the Series A Preferred and Series B Preferred with respect to the
     payments required or permitted to be made to the holders thereof pursuant
     to their respective governing instruments and payments required to be made
     to the holders of the Series A Preferred and Series B Preferred pursuant
     hereto: the shares of Common Stock and Series A Junior Participating
     Preferred Stock, par value $.01 per share.
 
     SECTION 12. RECORD HOLDERS. The corporation and the Transfer Agent may deem
and treat the record holder of any shares of Series A Preferred and Series B
Preferred as the true and lawful owner thereof for all purposes, and neither the
corporation nor Transfer Agent shall be affected by any notice to the contrary.
 
     SECTION 13. NOTICE. Except as may otherwise be provided by law or provided
for herein, all notices referred to herein shall be in writing, and all notices
hereunder shall be deemed to have been given upon receipt, in the case of a
notice of conversion given to the corporation as contemplated in Section 10(b)
hereof, or, in all other cases, upon the earlier of receipt of such notice or
three Business Days after the mailing of such notices sent by Registered Mail
(unless first-class mail shall be specifically permitted for such notice under
the terms hereof) with postage prepaid, addressed: If to the corporation, to its
principal executive offices (Attention: Corporate Secretary) or to any agent of
the corporation designated as permitted hereby; or if to a holder of the Series
A Preferred and Series B Preferred, to such holder at the address of such holder
of the Series A Preferred and Series B Preferred as listed in the stock record
books of the corporation (which shall include the records of the Transfer
Agent), or to such other address as the corporation or holder, as the case may
be, shall have designated by notice similarly given.
 
     SECTION 14. AUTHORIZATION BY NON-SERIES A AND B DIRECTORS. A majority of
the Non-Series A and B Directors shall make (and no Series B Director shall be
entitled to vote on) any determination required or permitted to be made by the
Board of Directors on behalf of the corporation (i) pursuant to Section 7(c)
hereof, as to whether to make payment of the Redemption Price of the Series A
Preferred and Series B Preferred in cash or in kind, (ii) pursuant to Section
7(a) hereof, as to whether to exercise the corporation's option to redeem
outstanding shares of Series A Preferred or Series B Preferred, or (iii)
pursuant to Section 4(c) hereof, as to whether to make payment of any dividends
declared by the Board of Directors on the Series A Preferred and Series B
Preferred in cash or in kind; provided that, the Non-Series A and B Directors
shall not be entitled to make any determination to pay cash dividends unless the
corporation shall have sufficient cash legally available to make such payment in
full.
 
     SECTION 15. SUCCESSORS AND TRANSFEREES. The provisions applicable to shares
of Series A Preferred and Series B Preferred shall bind and inure to the benefit
of and be enforceable by the corporation, the respective successors to the
corporation, and by any record holder of shares of Series A Preferred and Series
B Preferred.
 
     SECTION 16. CONVERSION OF SERIES B TO SERIES A SHARES. Upon any transfer of
shares of Series B Preferred (or any transfer of beneficial ownership of such
shares) to any Person other than to any Partnership Affiliate, such shares shall
be automatically converted to shares of Series A Preferred on a one for one
basis, and as a condition to the registration of the transfer of such shares,
the certificate for the shares of Series B Preferred to be transferred shall be
surrendered to the Transfer Agent in exchange for the issuance of a certificate
for the same number of shares of Series A Preferred registered in the name of
the transferee. In addition, at such time as the Minimum Ownership Condition is
no longer met, all shares of Series B Preferred remaining outstanding shall be
automatically converted to shares of Series A Preferred on a one for one basis
and each holder of shares of Series B Preferred shall surrender to the Transfer
Agent the certificates for such shares in exchange for certificates for the same
number of shares of Series A Preferred registered in the name of such holder.
 
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     RESOLVED FURTHER, that the appropriate officers of the corporation, be, and
they are hereby, authorized and directed from time to time to execute such
certificates, instruments or other documents and do all such things as may be
necessary or advisable in their discretion in order to carry out the terms
hereof, including the filing with the Secretary of State for the State of Texas
of a copy of the foregoing resolution executed by an officer of the corporation.
 
Dated: June 26, 1996.
 
                                           MESA INC.



                                           By:  /s/ STEPHEN K. GARDNER
                                               --------------------------------
                                                    Stephen K. Gardner
                                                    Vice President and
                                                    Chief Financial Officer



 
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