Exhibit 10.1

                           PURCHASE AND SALE AGREEMENT





                                     BETWEEN



                  ST. MARY LAND & EXPLORATION COMPANY, ET AL.,



                                    AS SELLER



                                       AND



                             ABRAXAS OPERATING, LLC



                                    AS BUYER





                            Dated: December 11, 2007








                                TABLE OF CONTENTS


                                                                                                               Page

                                                                                                           
ARTICLE 1            ASSETS.......................................................................................1

         Section 1.01       Agreement to Sell and Purchase........................................................1
         Section 1.02       Assets................................................................................1
         Section 1.03       Excluded Assets.......................................................................3

ARTICLE 2            PURCHASE PRICE...............................................................................5

         Section 2.01       Purchase Price........................................................................5
         Section 2.02       Deposit...............................................................................5
         Section 2.03       Allocated Values......................................................................6
         Section 2.04       Section 1031 Like-Kind Exchange.......................................................6

ARTICLE 3            EFFECTIVE TIME...............................................................................7

         Section 3.01       Ownership of Assets...................................................................7
         Section 3.02       Production Imbalances.................................................................7

ARTICLE 4            TITLE AND ENVIRONMENTAL MATTERS..............................................................7

         Section 4.01       Examination Period....................................................................7
         Section 4.02       Title Defects.........................................................................8
         Section 4.03       Notice of Title Defects...............................................................8
         Section 4.04       Remedies for Title Defects...........................................................11
         Section 4.05       Special Warranty of Title............................................................11
         Section 4.06       Preferential Rights to Purchase......................................................14
         Section 4.07       Consents to Assignment...............................................................14
         Section 4.08       Remedies for Title Benefits..........................................................15
         Section 4.09       Environmental Review.................................................................16
         Section 4.10       Definitions Used in Article 4 and in this Agreement..................................17
         Section 4.11       Notice of Environmental Defects......................................................18
         Section 4.12       Remedies for Environmental Defects...................................................19
         Section 4.13       Independent Experts..................................................................20
         Section 4.14       Limitation of Remedies For Title Benefits, Title Defects and Environmental Defects...21
         Section 4.15       DISCLAIMER AND WAIVER................................................................22

ARTICLE 5            REPRESENTATIONS AND WARRANTIES OF SELLER....................................................22

         Section 5.01       Existence............................................................................22
         Section 5.02       Legal Power..........................................................................22
         Section 5.03       Execution............................................................................23
         Section 5.04       Brokers..............................................................................23
         Section 5.05       Bankruptcy...........................................................................23
         Section 5.06       Suits and Claims.....................................................................23
         Section 5.07       Taxes................................................................................23

                                        i


         Section 5.08       AFEs.................................................................................23
         Section 5.09       Compliance with Laws.................................................................23
         Section 5.10       Contracts............................................................................23
         Section 5.11       Production Imbalances................................................................24
         Section 5.12       Royalties; Payments for Production...................................................24
         Section 5.13       Insurance............................................................................24
         Section 5.14       Plugging Obligations.................................................................24
         Section 5.15       Personal Property and Equipment......................................................24
         Section 5.16       No Alienation........................................................................24
         Section 5.17       Hydrocarbon Sales Contracts..........................................................24
         Section 5.18       Area of Mutual Interest and Other Agreements.........................................25
         Section 5.19       Leases...............................................................................25
         Section 5.20       Property Expenses....................................................................25
         Section 5.21       Governmental Permits.................................................................25
         Section 5.22       No Adverse Change....................................................................25
         Section 5.23       Information..........................................................................25
         Section 5.24       Representations and Warranties Exclusive.............................................26

ARTICLE 6            REPRESENTATIONS AND WARRANTIES OF BUYER.....................................................26

         Section 6.01       Existence............................................................................26
         Section 6.02       Legal Power..........................................................................26
         Section 6.03       Execution............................................................................26
         Section 6.04       Brokers..............................................................................26
         Section 6.05       Bankruptcy...........................................................................27
         Section 6.06       Suits and Claims.....................................................................27
         Section 6.07       Independent Evaluation...............................................................27
         Section 6.08       Qualification........................................................................27
         Section 6.09       Securities Laws......................................................................27
         Section 6.10       No Investment Company................................................................27
         Section 6.11       Funds................................................................................27
         Section 6.12       Notice of Changes....................................................................28
         Section 6.13       Representations and Warranties Exclusive.............................................28

ARTICLE 7            OPERATION OF THE ASSETS.....................................................................28

         Section 7.01       Operation of the Assets..............................................................28
         Section 7.02       Buyer's Qualification................................................................29
         Section 7.03       Operation of the Assets after the Closing............................................29
         Section 7.04       Post Closing Accounting by Seller....................................................30
         Section 7.05       Limitations on Liability of Operator.................................................30
         Section 7.06       Public Announcements.................................................................31
         Section 7.07       Disclosure Information...............................................................31

ARTICLE 8            CONDITIONS TO OBLIGATIONS OF SELLER.........................................................32

         Section 8.01       Representations......................................................................32
         Section 8.02       Performance..........................................................................32
         Section 8.03       Pending Matters......................................................................32

                                       ii


ARTICLE 9            CONDITIONS TO OBLIGATIONS OF BUYER..........................................................32

         Section 9.01       Representations......................................................................32
         Section 9.02       Performance..........................................................................32
         Section 9.03       Pending Matters......................................................................32
         Section 9.04       Wachovia Liens.......................................................................33

ARTICLE 10           THE CLOSING.................................................................................33

         Section 10.01      Time and Place of the Closing........................................................33
         Section 10.02      Allocation of Costs and Expenses and Adjustments to Purchase Price at the Closing....33
         Section 10.03      Closing Adjustments and Allocations Statement........................................35
         Section 10.04      Post-Closing Allocations and Adjustments to Purchase Price...........................35
         Section 10.05      Transfer Taxes.......................................................................36
         Section 10.06      Ad Valorem and Similar Taxes.........................................................36
         Section 10.07      Actions of Seller at the Closing.....................................................37
         Section 10.08      Actions of Buyer at the Closing......................................................37
         Section 10.09      Recordation; Further Assurances......................................................37

ARTICLE 11           TERMINATION.................................................................................38

         Section 11.01      Right of Termination.................................................................38
         Section 11.02      Effect of Termination................................................................39
         Section 11.03      Attorneys' Fees, Etc.................................................................39

ARTICLE 12           ASSUMPTION AND INDEMNIFICATION..............................................................39

         Section 12.01      Buyer's Obligations after Closing....................................................39
         Section 12.02      Seller's Obligations after Closing...................................................40
         Section 12.03      Plugging and Abandonment Obligations.................................................40
         Section 12.04      Environmental Obligations............................................................41
         Section 12.05      Definition of Claims.................................................................42
         Section 12.06      Application of Indemnities...........................................................43
         Section 12.07      Buyer's Indemnity....................................................................44
         Section 12.08      Seller's Indemnity...................................................................44
         Section 12.09      Notices and Defense of Indemnified Claims............................................44
         Section 12.10      Survival.............................................................................44
         Section 12.11      Exclusive Remedy.....................................................................44
         Section 12.12      Defenses and Counterclaims...........................................................45
         Section 12.13      Anti-Indemnity Statute...............................................................45

ARTICLE 13           DISCLAIMERS; CASUALTY LOSS AND CONDEMNATION.................................................45

         Section 13.01      Disclaimers of Representations and Warranties........................................45
         Section 13.02      NORM.................................................................................46
         Section 13.03      Casualty Loss; Condemnation..........................................................47

                                      iii


ARTICLE 14           MISCELLANEOUS...............................................................................47

         Section 14.01      Names................................................................................47
         Section 14.02      Expenses.............................................................................47
         Section 14.03      Document Retention...................................................................48
         Section 14.04      Entire Agreement.....................................................................48
         Section 14.05      Waiver...............................................................................48
         Section 14.06      Construction.........................................................................48
         Section 14.07      No Third Party Beneficiaries.........................................................48
         Section 14.08      Assignment...........................................................................48
         Section 14.09      Governing Law; Venue.................................................................48
         Section 14.10      Notices..............................................................................49
         Section 14.11      Severability.........................................................................50
         Section 14.12      Interpretation.......................................................................50
         Section 14.13      Time of the Essence..................................................................51
         Section 14.14      Counterpart Execution................................................................51






                                       iv



                             EXHIBITS AND SCHEDULES


Exhibit A                  Subject Interests and Surface Agreements
Exhibit B                  Wells
Exhibit C                  Excluded Assets
Exhibit D                  Allocated Values
Exhibit E                  Form of Assignment and Bill of Sale
Exhibit F-1                Buyer Press Release
Exhibit F-2                St. Mary Press Release
Schedule 1.02(g)           Production Imbalances
Schedule 1.02(h)           Fee Property Description
Schedule 4.06              Rights of Preferential Purchase
Schedule 4.07              Consents to Assignment
Schedule 5.06              Litigation
Schedule 5.08              Authorizations for Expenditures
Schedule 5.13              Insurance
Schedule 5.14              Inactive Wells
Schedule 5.17              Production Sales Agreements
Schedule 5.21              Non-Transferable Permits



                                        v

                             Table of Defined Terms






Agreement...........................................1
Allocated Values....................................6
Assets..............................................1
Assignment.........................................12
Assumed Obligations................................40
Breach.............................................52
Buyer...............................................1
Buyer's Environmental Review.......................16
Casualty...........................................48
Casualty Loss......................................48
CERCLA.............................................18
Claims.............................................43
Closing............................................34
Closing Date.......................................34
Contracts...........................................3
Deposit.............................................5
Disclosure Information.............................32
Documents..........................................49
Effective Time......................................7
Environmental Defect...............................18
Environmental Defect Value.........................19
Environmental Information..........................18
Environmental Laws.................................18
Environmental Obligations..........................42
Equipment...........................................2
Examination Period..................................8
Excluded Assets.....................................3
Expiration Date....................................45
Facilities..........................................2
Final Settlement Date..............................36
Final Settlement Statement.........................36
Governmental Authority.............................18
Harrell.............................................1
Hydrocarbons........................................2
includes and including.............................51
Independent Expert.................................21
Information........................................26
Interim Operating Expenses.........................35
knowledge or knowingly.............................52
Lands...............................................1
Laws...............................................13
Lease and Leases....................................1
Marketable Title....................................8
material...........................................52
Material Adverse Effect............................52
NORM...............................................47
Notice of Disagreement.............................36
OPA................................................19
Overhead Fee.......................................31
Parties.............................................1
Party...............................................1
PDNP................................................6
Permits.............................................2
Permitted Encumbrances.............................12
Plugging and Abandonment Obligations...............42
Post-Closing Production Month......................31
Probable and/or Possible Locations..................6
Production Imbalances...............................7
PUD Locations.......................................6
Purchase Price......................................5
Purchase Price Allocations and Adjustments.........36
RCRA...............................................18
Records.............................................3
Representatives....................................44
Retained Obligations...............................41
Seismic License.....................................3
Seller..............................................1
Smith...............................................1
St. Mary............................................1
Statement..........................................36
Subject Interests...................................2
Surface Agreements..................................2
Tax................................................52
Title Benefit......................................16
Title Benefit Value................................16
Title Claim Date....................................9
Title Defect........................................8
Title Defect Value..................................9
Wachovia Liens.....................................14
Wells...............................................2

                                       vi

                           PURCHASE AND SALE AGREEMENT


         This Purchase and Sale Agreement (this "Agreement") is made and entered
into this 11TH day of December, 2007, by and between ST. MARY LAND & EXPLORATION
COMPANY, a Delaware  corporation ("St. Mary"), Ralph H. Smith Restated Revocable
Trust Dated  8/14/97,  Ralph H. Smith  Trustee  ("Smith"),  and Kent J. Harrell,
D/B/A Harrell Energy  ("Harrell")  (who are  collectively  referred to herein as
"Seller"),  and  ABRAXAS  OPERATING,  LLC,  a Texas  limited  liability  company
("Buyer").  Buyer  and  Seller  are  collectively  referred  to  herein  as  the
"Parties", and are sometimes referred to individually as a "Party."

                                R E C I T A L S:


         WHEREAS, Seller desires to sell to Buyer, and Buyer desires to purchase
from Seller,  the Assets (as defined  below),  all upon the terms and conditions
hereinafter set forth;

         NOW,  THEREFORE,  in consideration of Ten Dollars ($10.00) cash in hand
paid and of the mutual benefits derived and to be derived from this Agreement by
each  Party,  and for other good and  valuable  consideration,  the  receipt and
sufficiency of which are hereby  acknowledged,  Seller and Buyer hereby agree as
follows:

                                   ARTICLE 1

                                     ASSETS

Section 1. Agreement to Sell and Purchase. Subject to and in accordance with the
ter ms and  conditions  of this  Agreement,  Buyer agrees to purchase the Assets
from Seller, and Seller agrees to sell the Assets to Buyer.

Section 1.02 Assets.  Subject to Section 1.03,  the term "Assets" shall mean all
of Seller's right, title and interest in and to:

             (a) The oil, gas and other  mineral  leases  described on Exhibit A
         (collectively,   the  "Leases"  and   singularly  a  "Lease")  and  any
         overriding royalty interests, royalty interests, non-working or carried
         interests, mineral fee interests, operating rights and other rights and
         interests  described  in Exhibit  A,  together  with the lands  covered
         thereby or pooled or unitized  therewith (the  "Lands"),  together with
         (i) all right, title and interest of Seller in and to any other mineral
         interests of any nature (A) located in, on, or under the Lands,  or (B)
         which are attributable to the proration unit or designated  pooled unit
         for any of the Wells (as hereinafter  defined), in each case whether or
         not  described  in or omitted  from  Exhibit  A, but the Assets  shall,
         except as affected by the  provisions of Section  1.02(d),  not include
         any  portion of the Leases  regarding  lands  covered by any such Lease
         which  lands are not  specifically  described  in Exhibit A hereto,  it
         being  understood  that in some  instances the Leases cover lands which
         are not being sold by Seller to Buyer even though other portions of the
         Leases are intended to be  transferred  from Seller to Buyer,  (ii) all
         rights with respect to any pooled, communitized or unitized interest by
         virtue of any Leases and Lands or the interests described in clause (i)
         above  being a part  thereof,  and (iii) all  production  of oil,  gas,
         associated liquids and other hydrocarbons (collectively "Hydrocarbons")



         after the  Effective  Time from the Leases and the Lands,  and from any
         such pooled,  communitized,  or unitized  interest and allocated to any
         such Leases and Lands or the  interests  described  in clause (i) above
         (the  Leases,  the Lands,  and the rights  described in clauses (i) and
         (ii) above, and the Hydrocarbons described in clause (iii) above, being
         collectively  referred to as the "Subject Interests" or, singularly,  a
         "Subject Interest");

             (b)  all  easements,  rights-of-way,  servitudes,  surface  leases,
         surface use  agreements  and other rights or agreements  related to the
         use of the surface and subsurface (the "Surface  Agreements"),  in each
         case to the extent used in connection with the operation of the Subject
         Interests,  including those recorded  Surface  Agreements  described in
         Exhibit  A,  except,  that as to any  easement  or  right-of-way  which
         affects a Lease that includes  both the Lands and lands being  retained
         by Seller,  Seller  shall  grant a use right  only with  regard to such
         easement  or  right-of-way,  which use  rights  shall be limited to the
         portion of the Lease and the Lands to be  transferred  to Buyer and any
         necessary transit rights to enjoy such use rights;

             (c)  to  the  extent  assignable  or  transferable,   all  permits,
         licenses, franchises,  consents, approvals and other similar rights and
         privileges  (the  "Permits"),  in  each  case  to the  extent  used  in
         connection with the operation of the Subject Interests;

             (d) all equipment,  machinery, fixtures, spare parts, inventory and
         other personal property (including Seller's leasehold interests therein
         subject to any  necessary  consents to  assignment)  used in connection
         with the operation of the Subject  Interests or in connection  with the
         production, treatment, compression, gathering, transportation, sale, or
         disposal of  Hydrocarbons  produced from or attributable to the Subject
         Interests  (collectively,  "Equipment"),  and any water,  byproducts or
         waste  produced  therefrom  or  therewith  or  otherwise   attributable
         thereto,  including all wells (whether producing, shut in or abandoned,
         and whether for production,  produced water  injection or disposal,  or
         otherwise) described in Exhibit B (collectively,  the "Wells") together
         with  all  of  Seller's   interests  within  the  spacing,   producing,
         proration,  federal exploratory,  enhanced recovery,  or governmentally
         prescribed unit attended to the described  Wells,  wellhead  equipment,
         pumps,  pumping  units,  flowlines,  gathering  systems,  pipe,  tanks,
         treatment  facilities,   injection  facilities,   disposal  facilities,
         compression  facilities  and  other  materials,   supplies,  buildings,
         trailers and offices used in connection with the Subject  Interests and
         the  other  matters   described  in  this  definition  of  Assets  (the
         "Facilities");

             (e) to the extent  assignable or  transferable,  (i) all contracts,
         agreements,  drilling contracts, equipment leases, production sales and
         marketing  contracts,   farm-out  and  farm-in  agreements,   operating
         agreements,  service  agreements,  unit  agreements,  gas gathering and
         transportation   agreements   and  other   contracts,   agreements  and
         arrangements,  relating to the Subject  Interests and the other matters
         described  in  this  definition  of  Assets,  and  subject  to,  and in
         accordance with, any limitations set forth in such agreements, and (ii)
         equipment  leases  and rental  contracts,  service  agreements,  supply
         agreements and other contracts, agreements and arrangements relating to
         the  Subject   Interests  and  the  other  matters  described  in  this
         definition  of Assets,  (the  agreements  identified in clauses (i) and
         (ii) above being, collectively, the "Contracts");

                                       2


             (f) all files,  records and data relating to the items described in
         Sections  1.02(a) through (e) maintained by Seller  including,  without
         limitation,  the following, if and to the extent that such files exist:
         all books, records, reports, manuals, files, title documents, including
         correspondence,  records of production and maintenance, revenue, sales,
         expenses,  warranties,  lease files, land files,  well files,  division
         order files, abstracts, title opinions, assignments,  reports, property
         records, contract files, operations files, copies of tax and accounting
         records  (but  excluding  Federal  and state  income  tax  returns  and
         records) and files, maps, core data,  hydrocarbon analysis,  well logs,
         mud logs, field studies together with other files,  contracts and other
         records and data including all geologic and geophysical  data and maps,
         but excluding from the foregoing those files,  records and data subject
         to  written  unaffiliated  third  party  contractual   restrictions  on
         disclosure or transfer (the "Records").  Unless proscribed by the terms
         of any  existing  written  unaffiliated  third party  contract,  Seller
         shall,  to the  extent it may do so,  grant a  perpetual,  royalty-free
         license to Buyer of  Seller's  seismic  data that  covers  the  Subject
         Interests  (the  "Seismic  License").  To the  extent  that  any of the
         Records contain interpretations of Seller, Buyer agrees to rely on such
         interpretations  at its sole risk and  without  any duty on the part of
         Seller regarding such interpretations;

             (g)  all  Production  Imbalances,  including  those  set  forth  on
         Schedule 1.02(g) as of the Effective Time; and

             (h) all right,  title and interest in and to all surface rights and
         the  plant  pertaining  to the Buck  Peak  property  located  in Moffat
         County,  Colorado, as well as all of Seller's right, title and interest
         in that certain North Dakota fee property both as described on Schedule
         1.02(h).

Section 1.03 Excluded Assets.  Notwithstanding  the foregoing,  the Assets shall
not  include,  and  there is  excepted,  reserved  and  excluded  from the sale,
transfer and assignment  contemplated hereby the following excluded  properties,
rights and interests (collectively, the "Excluded Assets"):

             (a) those assets,  interests,  rights and  properties  described in
         Exhibit C;

             (b) all trade  credits and all  accounts,  instruments  and general
         intangibles  attributable  to the Assets with  respect to any period of
         time prior to the Effective Time;

             (c) except  for those  Claims or rights  against a third  party for
         which  Buyer has agreed to  indemnify  Seller  pursuant to the terms of
         this Agreement, all Claims of Seller,

                 (i) arising  from acts,  omissions  or events,  or damage to or
             destruction of property, occurring prior to the Effective Time,

                 (ii) arising under or with respect to any of the Contracts that
             are  attributable  to periods of time prior to the  Effective  Time
             (including claims for adjustments or refunds), or

                 (iii) with respect to any of the other Excluded Assets;

                                       3


             (d) all rights and interests of Seller,

                 (i) under any policy or agreement of insurance or indemnity,

                 (ii) under any bond, or

                 (iii) to any  insurance  or  condemnation  proceeds  or  awards
             arising in each case from acts,  omissions or events,  or damage to
             or destruction of property, occurring prior to the Effective Time;

             (e) all Hydrocarbons produced from or otherwise attributable to the
         Subject  Interests  with respect to all periods  prior to the Effective
         Time,  excluding  those  Hydrocarbons  referenced  in  Section  1.02(g)
         together with all proceeds from the sale of such Hydrocarbons,  and all
         Tax credits attributable thereto;

             (f) all Claims of Seller for refunds of or loss carry forwards with
         respect to

                 (i)  ad  valorem,  severance,  production  or any  other  Taxes
             attributable to any period prior to the Effective Time,

                 (ii) income, gross margin or franchise Taxes,

                 (iii) any Taxes  attributable to the other Excluded Assets, and
             such  other  refunds,  and  rights  thereto,  for  amounts  paid in
             connection with the Assets and  attributable to the period prior to
             the Effective Time, including refunds of amounts paid under any gas
             gathering or transportation agreement;

             (g)  all  amounts  due or  payable  to  Seller  as  adjustments  to
         insurance  premiums  related to the Assets  with  respect to any period
         prior to the Effective Time;

             (h) all  proceeds,  income or revenues  (and any  security or other
         deposits made)  attributable  to the Assets for any period prior to the
         Effective Time, or any other Excluded Assets;

             (i)  subject  to  Section  1.02(f),  all  of  Seller's  proprietary
         technology and improvements, computer software, patents, trade secrets,
         copyrights, names, trademarks, logos and other intellectual property;

             (j) all documents and  instruments  of Seller that may be protected
         by an attorney-client or other privilege;

             (k) data, information and other property,  rights or interests that
         cannot be disclosed or assigned to Buyer as a result of confidentiality
         or similar arrangements;

             (l)  all  audit  rights  arising  under  any  of the  Contracts  or
         otherwise  with respect to any period prior to the Effective Time or to
         any of the other Excluded Assets;

                                       4


             (m) all computers,  printers and other electronic equipment located
         in any  buildings,  offices or  trailers  that may belong to Seller and
         that may  constitute  part of the Assets,  including,  all software and
         electronic data relating in any way to such electronic equipment;

             (n) All corporate,  income tax and financial  records of Seller not
         included in the Records; and

             (o) all  agreements  providing for options,  swaps,  floors,  caps,
         collars,  forward sales or forward purchases  involving  commodities or
         commodity  prices,  or indexes  based on any of the  foregoing  and all
         other similar agreements and arrangements.

                                   ARTICLE 2

                                 PURCHASE PRICE

Section 2.01 Purchase Price. The total consideration for the purchase,  sale and
conveyance  of the  Assets  to  Buyer  and  Buyer's  assumption  of the  Assumed
Obligations and all other liabilities provided for in this Agreement, is Buyer's
payment  to  Seller  of  the  sum of  One  Hundred  and  Forty  Million  Dollars
($140,000,000)  (the  "Purchase  Price"),  as  adjusted in  accordance  with the
provisions of this Agreement.

Section 2.02 Deposit.

             (a) Concurrently  with the execution of this Agreement by Buyer and
         Seller, Buyer shall deliver to Seller in immediately  available funds a
         performance guarantee deposit in an amount equal to Ten Million Dollars
         ($10,000,000)   (the   "Deposit")  in  accordance  with  wire  transfer
         instructions provided by Seller to Buyer.

             (b)  Subject to the  proviso  set forth in Section  11.01,  if this
         Agreement  is  terminated  by Seller  pursuant to Section  11.01(b) and
         Seller does not waive the non-satisfaction of any conditions to Closing
         set forth in Article 8, Seller shall  retain the Deposit as  liquidated
         damages,  which remedy shall be the sole and exclusive remedy available
         to Seller for  Buyer's  failure to perform its  obligations  under this
         Agreement.  Buyer and Seller  acknowledge  and agree that (i)  Seller's
         actual  damages upon the event of such a  termination  are difficult to
         ascertain with any certainty, (ii) the Deposit is a reasonable estimate
         of such  actual  damages,  and (iii)  such  liquidated  damages  do not
         constitute a penalty.

             (c)  Subject to the  proviso  set forth in Section  11.01,  if this
         Agreement is terminated (i) by Buyer  pursuant to Section  11.01(c) and
         Buyer does not waive the  non-satisfaction of any conditions to Closing
         set forth in Article 9 or (ii) by Buyer or Seller  pursuant  to Section
         11.01(a), Section 11.01(d), Section 11.01(e), Section 11.01(f), Section
         11.01(g),  Section  11.01(h) or Section  13.03(c),  then  Seller  shall
         promptly  return the Deposit to Buyer in  immediately  available  funds
         pursuant to wire transfer  instructions  to be provided timely by Buyer
         to Seller within three (3) business days after the event giving rise to
         such  return  obligation.  Buyer and Seller  shall  thereupon  have the
         rights and obligations set forth elsewhere herein.

                                       5


             (d) If all  conditions  precedent to the  obligations of Seller set
         forth in Article 8 have been met, then notwithstanding any provision in
         this Section 2.02 to the  contrary,  if Closing does not occur  because
         Seller  wrongfully fails to tender  performance at Closing or otherwise
         Breaches this  Agreement in any respect prior to Closing,  and Buyer is
         ready and otherwise able to close, at Buyer's sole election, either (i)
         Seller shall return the Deposit to Buyer within three (3) business days
         after the determination  that the Closing will not occur, or (ii) Buyer
         shall have the right to pursue specific  performance of this Agreement,
         provided that Buyer must file an action for specific performance within
         21  days of  Seller's  Breach.  If  Buyer  elects  to  pursue  specific
         performance,  Buyer must pursue  specific  performance  as its sole and
         exclusive remedy in lieu of all other legal and equitable remedies.  If
         such action for  specific  performance  is not filed  within 21 days of
         Seller's Breach or if Buyer is unsuccessful for any reason other than a
         Breach of this Agreement by Buyer, Buyer shall be deemed to have waived
         all legal and  equitable  remedies  and its sole  remedy  for  Seller's
         Breach of this  Agreement  shall be limited to the prompt return of the
         Deposit.

Section 2.03 Allocated Values.  The Purchase Price is allocated among the Assets
(including  the  Wells,  PUD  Locations,  PDNP,  and  Probable  and/or  Possible
Locations) as set forth in Exhibit D (the "Allocated Values"). In no event shall
the aggregate of the Allocated  Values of any Wells,  PUD  Locations,  PDNP, and
Probable and/or Possible  Locations  exceed the unadjusted  Purchase Price.  The
term "PUD  Locations"  means those Proved  Undeveloped  potential well locations
specifically identified in Exhibit D. The term "PDNP" means Proved Developed Not
Producing intervals as specifically  identified on Exhibit D. The term "Probable
and/or Possible  Locations"  means those locations  specifically  identified and
designated  as such on Exhibit  D.  Seller  and Buyer  agree that the  Allocated
Values shall be used to compute any  adjustments  to the Purchase Price pursuant
to the provisions of Article 4. Any  adjustment to the Purchase Price  hereunder
shall be reflected  in the  allocation  set forth in Exhibit D  consistent  with
Treasury  Regulation Section 1.1060-IT (f). For tax purposes,  the Parties agree
to report the transactions contemplated by this Agreement in a manner consistent
with the terms of this  Agreement,  including the allocations set forth above as
of the Closing Date, and that neither Party will take any position  inconsistent
therewith,  including in any tax return,  in any refund claim, in any litigation
or arbitration or otherwise.

Section 2.04 Section 1031 Like-Kind Exchange. Seller and Buyer hereby agree that
Seller  shall  have  the  right  at any  time  prior  to  completion  of all the
transactions  that are to occur at  Closing  to assign  all or a portion  of its
rights under this Agreement to a Qualified Intermediary (as that term is defined
in  Section  1.1031(k)-1(g)(4)(v)  of the  Treasury  Regulations)  in  order  to
accomplish the  transaction in a manner that will comply,  either in whole or in
part, with the requirements of a like-kind  exchange pursuant to Section 1031 of
the Internal  Revenue Code of 1986, as amended.  Likewise,  Buyer shall have the
right at any time prior to completion of all the transactions  that are to occur
at Closing to assign all or a portion of its rights  under this  Agreement  to a
Qualified Intermediary for the same purpose. If Seller assigns all or any of its
rights under this  Agreement  for this  purpose,  Buyer agrees to (a) consent to
Seller's  assignment of its rights in this Agreement,  which assignment shall be
in a form reasonably  acceptable to Buyer,  and (b) pay the Purchase Price (or a
designated  portion  thereof as specified by Seller) into a qualified  escrow or
qualified trust account at Closing as directed in writing.  If Buyer assigns all
or any of its rights under this Agreement for this purpose, Seller agrees to (i)
consent to Buyer's assignment of its rights in this Agreement,  which assignment


                                       6


shall be in a form  reasonably  acceptable  to Seller,  (ii) accept the Purchase
Price from the qualified escrow or qualified trust account at Closing, and (iii)
at  Closing,  convey and  assign  directly  to Buyer the Assets (or any  portion
thereof) as directed by Buyer.  Seller and Buyer  acknowledge and agree that any
assignment  of  this  Agreement  (or  any  rights   hereunder)  to  a  Qualified
Intermediary shall not release any Party from any of its respective  liabilities
and obligations hereunder,  and that neither Party represents to the other Party
that  any  particular  tax  treatment  will be  given  to any  Party as a result
thereof.  The Party  electing  to assign  all or any of its  rights  under  this
Agreement  pursuant  to this  Section  2.04  shall  defend,  indemnify  and hold
harmless  the other Party and its  Affiliates  from all Claims  relating to such
election.

                                   ARTICLE 3

                                 EFFECTIVE TIME

Section 3.01 Ownership of Assets.  If the transactions  contemplated  hereby are
consummated in accordance with the terms and provisions hereof, the ownership of
the Assets shall be  transferred  from Seller to Buyer on the Closing Date,  but
effective  for all  purposes as of 7:00 a.m.  local time at the  location of the
Assets on December 1, 2007 (the "Effective Time").

Section  3.02  Production  Imbalances.  Upon  Closing,  Buyer  shall  assume the
positions of Seller with respect to all gas imbalances  and make-up  obligations
related  to  the  Assets  regardless  of  whether  such  imbalances  or  make-up
obligations arise before or after the Effective Time, at the wellhead, pipeline,
gathering  system or other  location,  and  regardless of whether the same arise
under  contract  or  otherwise  ("Production  Imbalances").  As a result of such
assumption,  Buyer shall (a) be entitled to receive any and all  benefits  which
Seller would have been entitled to receive by virtue of its position,  including
rights to produce and receive  volumes of  production in excess of volumes which
it would  otherwise  have been  entitled  to  produce  and to  receive  cash gas
balancing by virtue of  ownership of the Assets,  (b) be obligated to suffer any
detriments or losses which Seller would have been  obligated to suffer by virtue
of such  position,  including  the  obligation  to deliver to others  production
volumes which would have  otherwise  been  attributable  to its ownership of the
Assets, to deliver production to purchasers thereof without Buyer receiving full
payment therefor, or to make cash balancing payments or to repay any take or pay
payments,  and (c) be responsible for any and all royalty  obligations and other
burdens with respect to such Production Imbalances; provided however, nothing in
this  subsection  (c) of Section  3.02 shall  relieve  Seller  from any  royalty
obligation affecting production Seller has actually received,  or which has been
credited to Seller's interest in the Assets.

                                   ARTICLE 4

                         TITLE AND ENVIRONMENTAL MATTERS

Section 4.01 Examination Period.  Until 5:00 p.m. MST on the date which is seven
(7) days prior to the Closing  Date (the  "Examination  Period"),  Seller  shall
permit Buyer and/or its  representatives  to examine during normal business days
and hours at a location  designated  by Seller,  all  abstracts of title,  title
opinions,  title files,  ownership maps,  lease,  Well and division order files,
assignments,  operating  and  accounting  records  and all  Surface  Agreements,


                                       7


Permits,  Contracts  and  other  agreements,   data,  analyses  and  information
pertaining  to the  Assets  insofar as same may now be in  existence  and in the
possession of Seller,  subject to such restrictions upon disclosure as may exist
under  confidentiality  or other agreements  binding upon Seller and relating to
such data.

Section 4.02 Title Defects. The term "Title Defect" means (a) any
encumbrance on, encroachment on, irregularity in, defect in or objection to
Seller's ownership of the Assets (excluding Permitted Encumbrances) that causes
Seller not to have Marketable Title to a Well, a PUD Location, a PDNP or a
Probable and/or Possible Location as described in Exhibit D; or (b) any default
by Seller under a lease, farm-out agreement or other contract or agreement that
would (i) have a material and adverse effect on the operation, value or use of
such Asset, (ii) prevent Seller from receiving the proceeds of production
attributable to Seller's interest therein, or (iii) result in cancellation of
all or a portion of Seller's interest therein. The term "Marketable Title" means
such ownership by Seller in the Assets that, subject to and except for the
Permitted Encumbrances:

             (a)  entitles  Seller to receive not less than the  percentage  set
         forth in Exhibit D as Seller's Net Revenue Interest of all Hydrocarbons
         produced,  saved and marketed from such Well,  PUD  Location,  PDNP, or
         Probable  and/or  Possible  Locations  described in such  exhibit,  all
         without   reduction,   suspension  or   termination  of  such  interest
         throughout the productive life of such Well, except as specifically set
         forth in such exhibit;

             (b) obligates  Seller to bear not greater than the  percentage  set
         forth in  Exhibit  D as  Seller's  Working  Interest  of the  costs and
         expenses relating to the maintenance, development and operation of such
         Well, PUD Location,  PDNP, or Probable and/or Possible  Locations,  all
         without increase throughout the productive life of such Well, except as
         specifically set forth in either of such exhibit; and

             (c) is free and clear of all  liens,  encumbrances  and  defects in
         title.

Subject to the limitations of Section 4.14, Breaches of Seller's representations
and warranties  contained in Section 5.07 through Section 5.24 discovered  prior
to the  Closing  shall be  treated  as Title  Defects  for  purposes  of  making
pre-Closing adjustments to the Purchase Price.

Section 4.03 Notice of Title  Defects.  Buyer shall provide Seller notice of all
Title  Defects no later  than 5:00 p.m.  MST on the date which is seven (7) days
prior to the Closing Date (the "Title Claim Date"). To be effective, such notice
must (a) be in writing, (b) be received by Seller on or prior to the Title Claim
Date, (c) describe the Title Defect in reasonable  detail (including any alleged
variance in the Net Revenue  Interest or Working  Interest),  (d)  identify  the
specific  Asset or Assets  affected by such Title Defect,  (e) include the Title
Defect Value,  as reasonably  determined by Buyer in good faith,  and (f) comply
with the limitations and Title Defect Value  qualifications set forth in Section
4.14.  Any  matters  identified  by Buyer  during the  Examination  Period  that
constitute Title Defects, but of which Seller has not been specifically notified
by Buyer in accordance  with the foregoing,  shall be deemed to have been waived
by Buyer  for all  purposes  and shall  constitute  Permitted  Encumbrances  and
Assumed  Obligations  hereunder.  Upon receipt of notices of Title Defects,  the
Parties shall meet and determine upon which of the Title  Defects,  Title Defect
Values and methods of cure the Parties have reached agreement.  Upon the receipt


                                       8


of such notice from Buyer, Seller shall have the option, but not the obligation,
for a period ending  ninety (90) days after the Closing to cure such defect.  If
Seller should not elect to cure a Title Defect,  and no aspect of such defect is
reasonably in dispute,  the Purchase  Price shall be adjusted for such defect by
the amount of the Title Defect Value.

             (a) The value  attributable to each Title Defect (the "Title Defect
         Value") that is asserted by Buyer in the Title Defect  notices shall be
         determined based upon the criteria set forth below:

                 (i) If the Title  Defect is a lien  upon any  Asset,  the Title
             Defect Value is the amount  necessary to be paid to remove the lien
             from the affected Asset;

                 (ii) If the  Title  Defect  asserted  is that  the Net  Revenue
             Interest attributable to any Well, PUD Location,  PDNP, or Probable
             and/or  Possible  Locations  is less than that stated in Exhibit D,
             then the Title  Defect  Value  shall be the  absolute  value of the
             number determined by the following formula:

                       Title Defect Value  =  A  x  (1-[B/C])

                       A  =  Allocated Value for the affected Asset

                       B  =  Correct Net Revenue Interest for the affected Asset

                       C  =  Net Revenue Interest for the affected
                       Asset as set forth on Exhibit D.

                 (iii)  If  the   Title   Defect   represents   an   obligation,
             encumbrance,  burden or charge upon the affected  Asset  (including
             any  increase  in  Working  Interest  for  which  there  is  not  a
             proportionate  increase  in Net  Revenue  Interest)  for  which the
             economic  detriment  to Buyer is  unliquidated,  the  amount of the
             Title Defect Value shall be  determined  by taking into account the
             Allocated  Value of the  affected  Asset,  the portion of the Asset
             affected by the Title Defect, the legal effect of the Title Defect,
             the potential  discounted  economic effect of the Title Defect over
             the life of the affected Asset,  and the Title Defect Values placed
             upon the Title Defect by Buyer and Seller;

                 (iv) If a Title  Defect is not in effect or does not  adversely
             affect  an  Asset   throughout   the  entire  post  Effective  Time
             productive  life of such  Asset,  such  fact  shall be  taken  into
             account in determining the Title Defect Value;

                 (v)  The  Title  Defect  Value  of  a  Title  Defect  shall  be
             determined  without  duplication of any costs or losses included in
             another Title Defect Value hereunder;

                 (vi)  Notwithstanding  anything  herein to the contrary,  in no
             event shall a Title Defect Value exceed the Allocated  Value of the
             Wells, PUD Locations,  PDNP, Probable and/or Possible Locations, or
             other Assets affected thereby;

                                       9


                 (vii)  If the  Title  Defect  Value of an Asset is equal to the
             Allocated Value of such Asset, the affected Asset shall be excluded
             from the purchase and sale contemplated by this Agreement,  and the
             Purchase Price shall be adjusted accordingly;

                 (viii)  Notwithstanding  the provisions of this Section 4.03 to
             the contrary, the Title Defect Value of any Title Defect comprising
             a required  consent not obtained  (other than consents  customarily
             obtained  after  Closing)  shall  be  determined   subject  to  any
             accommodation implemented pursuant to Section 4.07; and

                 (ix) Such other factors as are  reasonably  necessary to make a
             proper evaluation.

             (b) The term Title Defect shall not include:

                 (i) Defects based solely on an assertion  that  Seller's  files
             lack  information,  provided that any missing material  information
             can be obtained by the reasonable efforts of Buyer;

                 (ii)  Defects  in the early  chain of title  consisting  of the
             failure to recite  marital  status in a document  or  omissions  of
             successors of heirship or estate proceedings, unless Buyer provides
             a reasonable  basis for the assertion that such failure or omission
             has resulted in a third party's  actual and superior claim of title
             to the affected Asset;

                 (iii) Defects arising out of lack of survey;

                 (iv)  Defects  arising out of lack of corporate or other entity
             authorization  unless  Buyer  provides a  reasonable  basis for the
             assertion  that the action was not authorized and that such lack of
             authorization  has resulted in a third party's  actual and superior
             claim of title to the affected Asset;

                 (v) Defects that are defensible by possession  under applicable
             statutes of limitations for adverse possession or for prescription;
             provided  that the mere  passage of time in and of itself shall not
             establish any presumption of the applicability of the provisions of
             this Section 4.03(b)(v);

                 (vi)  Defects  asserting  a  change  in an  applicable  Working
             Interest or Net Revenue  Interest based on a change in drilling and
             spacing units, tract allocation or other changes in pooling or unit
             participation occurring after the date of this Agreement; and

                 (vii) Title requirements  customarily considered as advisory or
             which can be waived as a matter of prudent business judgment.

                                       10


Section 4.04 Remedies for Title Defects.

             (a) For any Title Defect noticed  pursuant to Section 4.03 that has
         not been  cured  at or prior to  Closing,  the  Purchase  Price  shall,
         subject to the  provisions  of Section 4.14, be decreased at Closing by
         either (i) the amount the Parties  acting  reasonably and in good faith
         agree in lieu of a cure of the  asserted  Title  Defect,  or (ii)  with
         respect to any Title  Defect for which the Parties  have not yet agreed
         as to the validity of the Title Defect,  the Title Defect Value, or the
         manner of cure,  then by the amount of the Title Defect Value  asserted
         by Buyer for such uncured or unadjusted Title Defect.

             (b) Notwithstanding  anything to the contrary in this Section 4.04,
         if any Title Defect is in the nature of a consent to assignment that is
         not obtained or other  restriction  on  assignment,  the  provisions of
         Section 4.07 shall apply.

             (c) If at the  expiration  of thirty (30) days after  Closing,  the
         Parties have not agreed upon the validity of any asserted Title Defect,
         the   appropriate   cure  of  the  same,  or  the  Title  Defect  Value
         attributable  thereto,  either  Party  shall have the right to elect to
         have any such dispute  determined by an Independent  Expert pursuant to
         Section 4.13.

             (d) Once a Title  Defect  is cured by  Seller  at its sole cost and
         expense to Buyer's reasonable  satisfaction,  or the existence or value
         of the Title Defect is  determined  with  finality  either by agreement
         between the affected  Parties or in accordance with Section 4.13, Buyer
         shall promptly pay to Seller (i) in the case of a Title Defect which is
         cured,  the amount the  Purchase  Price was  decreased  at Closing as a
         result of this  previously  uncured Title Defect or (ii) in the case of
         an Asset  affected  by an  unresolved  Title  Defect  and for which the
         validity of the Title Defect or the Title  Defect  Value is  determined
         with finality  whether by agreement or in accordance with Section 4.13,
         the  difference,  if any,  between  the amount the  Purchase  Price was
         decreased at Closing as a consequence  of such asserted and  unresolved
         Title Defect and the amount determined with finality.

Section  4.05  Special  Warranty of Title.  The  documents  to be  executed  and
delivered  by Seller  to Buyer,  transferring  title to the  Assets as  required
hereby,  including the Assignment and Bill of Sale the form of which (subject to
modification to meet state recording statute requirements) is attached hereto as
Exhibit E (the "Assignment"), shall provide for a special warranty of title, by,
through and under Seller  severally as to their  respective  interests in and to
the  Assets  and  subject to the  Permitted  Encumbrances  and the terms of this
Agreement.  The term  "Permitted  Encumbrances"  shall mean any of the following
matters to the extent the same are valid and subsisting and affect the Assets:

             (a) any (i) undetermined or inchoate liens or charges  constituting
         or securing the payment of expenses  that were  incurred  incidental to
         the maintenance,  development, production or operation of the Assets or
         for the purpose of  developing,  producing or  processing  Hydrocarbons
         therefrom or therein, and (ii) materialman's,  mechanics', repairman's,
         employees',  contractors',  operators'  liens or other similar liens or
         charges  for  liquidated  amounts  arising  in the  ordinary  course of
         business  (A) that  Seller has agreed to retain or pay  pursuant to the


                                       11


         terms  hereof,  or (B) for which  Seller is  responsible  for paying or
         releasing at the Closing;

             (b) any liens for Taxes and  assessments  not yet delinquent or, if
         delinquent,  that are being  contested  in good  faith in the  ordinary
         course of business  and for which  Seller has agreed to pay pursuant to
         the terms  hereof or which  have been  prorated  pursuant  to the terms
         hereof;

             (c) the terms, conditions, restrictions,  exceptions, reservations,
         limitations  and other  matters  contained in  (including  any liens or
         security interests created by law or reserved in oil and gas leases for
         royalty,  bonus or rental,  or created  to secure  compliance  with the
         terms of) the Contracts,  Surface Agreements,  the Leases and any other
         agreements,  instruments,  documents  and other  matters  described  or
         referred to in any Exhibit or Schedule  hereto,  or other terms in such
         instruments  that  create or  reserve  to Seller  its  interest  in the
         Assets;  provided,  that, such matters do not operate to (i) reduce the
         Net Revenue  Interest of Seller in any Well,  PUD  Location,  PDNP,  or
         Probable and/or  Possible  Locations as reflected in Exhibit D, or (ii)
         increase  the  proportionate  share of costs and  expenses of leasehold
         operations  attributable  to or to be borne by the Working  Interest of
         Seller with respect to any Well, PUD Location, PDNP, or Probable and/or
         Possible  Locations  as  reflected  in  Exhibit  D,  unless  there is a
         proportionate increase in Seller's applicable Net Revenue Interest;

             (d)  any  obligations  or  duties   affecting  the  Assets  to  any
         Governmental Authority with respect to any franchise, grant, license or
         permit,  and all  applicable  federal,  state  and local  laws,  rules,
         regulations,  guidances, ordinances, decrees ("Laws") and orders of any
         Governmental Authority;

             (e) any (i) easements, rights-of-way,  servitudes, permits, surface
         leases and other  rights in respect of surface  operations,  pipelines,
         grazing, hunting, lodging, canals, ditches, reservoirs or the like, and
         (ii)  easements for streets,  alleys,  highways,  pipelines,  telephone
         lines, power lines,  railways and other similar  rights-of-way on, over
         or in  respect  of  property  owned or leased  by Seller or over  which
         Seller owns rights-of-way, easements, permits or licenses;

             (f) all royalties,  overriding  royalties,  net profits  interests,
         carried  interests,  production  payments,  reversionary  interests and
         other burdens on or deductions from the proceeds of production  created
         or  in  existence  as  of  the  Effective  Time,  whether  recorded  or
         unrecorded,  that do not (i) reduce the Net Revenue  Interest of Seller
         in any Well, PUD Location,  PDNP, or Probable and/or Possible Locations
         and as reflected in Exhibit D, or (ii) increase the proportionate share
         of costs and expenses of leasehold operations  attributable to or to be
         borne by the Working  Interest of Seller with respect to any Well,  PUD
         Location,  PDNP, or Probable and/or Possible  Locations as reflected in
         Exhibit  D,  unless  there  is a  proportionate  increase  in  Seller's
         applicable Net Revenue Interest;

             (g) preferential  rights to purchase or similar agreements (i) with
         respect  to  which  (A)  waivers  or  consents  are  obtained  from the
         appropriate  parties for the transaction  contemplated  hereby,  or (B)
         required  notices  have  been  given for the  transaction  contemplated


                                       12


         hereby to the  holders of such  rights and the  appropriate  period for
         asserting  such rights has expired  without an exercise of such rights,
         or (ii) not exercised prior to Closing, subject to Section 4.06;

             (h)  required  third  party  consents  to  assignments  or  similar
         agreements  with  respect to which (i)  waivers or  consents  have been
         obtained from the appropriate parties for the transaction  contemplated
         hereby,  or (ii) required  notices have been given for the  transaction
         contemplated  hereby to the holders of such rights and the  appropriate
         period for  asserting  such rights has  expired  without an exercise of
         such rights;

             (i) all rights to consent by, required notices to, filings with, or
         other actions by, Governmental Authorities in connection with the sale,
         transfer  or  conveyance  of the Assets that are  customarily  obtained
         subsequent to such sale or conveyance;

             (j) production  sales  contracts;  division  orders;  contracts for
         sale,  purchase,  exchange,  refining or  processing  of  hydrocarbons;
         unitization  and  pooling   designations,   declarations,   orders  and
         agreements;  operating agreements;  agreements of development;  area of
         mutual  interest  agreements;  gas  balancing  or  deferred  production
         agreements;   processing   agreements;   plant  agreements;   pipeline,
         gathering and transportation  agreements;  injection,  repressuring and
         recycling  agreements;  water or other disposal agreements;  seismic or
         geophysical  permits or  agreements;  and any and all other  agreements
         that are  ordinary  and  customary  to the oil,  gas and other  mineral
         exploration,  development,  processing or extraction business or in the
         business of processing  of gas and gas  condensate  production  for the
         extraction of products therefrom;  provided,  that, such matters do not
         (i)  reduce  the Net  Revenue  Interest  of  Seller  in any  Well,  PUD
         Location,  PDNP, or Probable and/or Possible  Locations as reflected in
         Exhibit  D or (ii)  increase  the  proportionate  share  of  costs  and
         expenses of leasehold operations  attributable to or to be borne by the
         Working  Interest of Seller  with  respect to any Well,  PUD  Location,
         PDNP, or Probable and/or Possible  Locations as reflected in Exhibit D,
         unless there is a  proportionate  increase in Seller's  applicable  Net
         Revenue Interest;

             (k) rights reserved to or vested in any  Governmental  Authority to
         control or  regulate  any of the Wells or units  included in the Assets
         and the applicable laws,  rules,  and regulations of such  Governmental
         Authorities;

             (l) all  defects  and  irregularities  affecting  the Assets  which
         individually  or in the  aggregate  do not (i) reduce  the Net  Revenue
         Interest of Seller in any Well, PUD Location,  PDNP, or Probable and/or
         Possible  Locations  as  reflected  in  Exhibit  D, (ii)  increase  the
         proportionate  share of costs  and  expenses  of  leasehold  operations
         attributable to or to be borne by the Working  Interests of Seller with
         respect to any Well, PUD Location,  PDNP, or Probable  and/or  Possible
         Locations as  reflected  on Exhibit D unless  there is a  proportionate
         increase  in  Seller's  applicable  Net  Revenue  Interest,   or  (iii)
         otherwise  result  in a  material  and  adverse  interference  with the
         operation, value or use of the Assets;

             (m)  conventional  rights of reassignment  arising upon decision to
         surrender or abandon an interest; and

                                       13


             (n) all deeds of trust and other security  interests  burdening the
         Assets granted by Seller in connection with its credit facilities under
         which  Wachovia  Bank  serves as  administrative  agent (the  "Wachovia
         Liens"),  it being understood that the release of the Wachovia Liens is
         a condition to the Closing as provided in Section 9.04.

Section 4.06 Preferential Rights to Purchase.

             (a) After consultation with Buyer,  Seller shall use its reasonable
         efforts,  but without any  obligation to incur  anything but reasonable
         costs  and  expenses  in  connection  therewith,  to  comply  with  all
         preferential right to purchase  provisions  relative to any Asset prior
         to  the  Closing,  including  those  rights  of  preferential  purchase
         identified on Schedule 4.06.

             (b) Prior to the Closing, Seller shall promptly notify Buyer if any
         of such preferential  purchase rights are exercised or if the requisite
         period has elapsed without such rights having been exercised.

             (c) If a third party who has been  offered an interest in any Asset
         pursuant  to a  preferential  right  to  purchase  elects  prior to the
         Closing to purchase all or part of such Assets, and the closing of such
         transaction does occur on or before the Closing Date, then the interest
         or part thereof so affected will be eliminated  from the Assets and the
         Purchase Price shall be reduced by the Allocated  Value of such Assets.
         If any such third  party has  elected to  purchase  all or a part of an
         interest in any Asset subject to a preferential right to purchase,  but
         has failed to close the  transaction  by the Closing Date,  then all of
         the Assets will be conveyed to Buyer at Closing,  without adjustment to
         the Purchase Price,  and on the Closing Date Buyer shall, as an Assumed
         Obligation, assume all duties, obligations and liabilities, of any kind
         or nature, arising from, out of, or in connection with, any enforceable
         preferential right to purchase that is outstanding,  and, if exercised,
         Buyer shall receive the payment  therefor and shall assign the affected
         portion  of the  Assets to the  holder of such  exercised  preferential
         right to purchase.  In addition, in the event an interest is offered by
         Seller  pursuant to a  preferential  right to purchase for which notice
         has been given but the time  period for  response by the holder of such
         right extends beyond Closing,  such interest shall be conveyed to Buyer
         at the Closing,  without  reduction to the Purchase Price, and shall be
         subject to such preferential right of purchase.

Section 4.07 Consents to  Assignment.  If any Asset is subject to a Title Defect
as a result of a consent to assignment not having been obtained, including those
consents to assignment set forth on Schedule 4.07, or, of the existence of other
restrictions on assignment or conveyance, the following provisions shall apply:

             (a) Buyer and Seller shall  cooperate in any  reasonable and lawful
         arrangement proposed to provide Buyer with the benefits of ownership of
         the  affected  Asset  without  breaching  the  consent  requirement  or
         restriction comprising such Title Defect; and

             (b) If such arrangement involves Seller retaining actual title with
         beneficial title being assigned to Buyer at the Closing, then:

                                       14


             (i) only such  beneficial  title  shall be assigned to Buyer at the
         Closing,  without any  adjustment to the Purchase  Price for such Title
         Defect; and

             (ii) if such  consent is  obtained or such  restriction  eliminated
         following  the Closing,  then Seller shall execute and deliver to Buyer
         an assignment of Seller's  retained  title and any related  obligations
         consistent with the terms of this Agreement.

Section 4.08 Remedies for Title Benefits.

             (a) If Buyer discovers any Title Benefit  affecting the Assets,  it
         shall  promptly  notify Seller in writing  thereof.  Subject to Section
         4.14,  Seller shall be entitled to an upward adjustment to the Purchase
         Price  with  respect to all Title  Benefits  in an amount  (the  "Title
         Benefit Value")  determined in accordance with the formula provided for
         in this Section  4.08(a).  The term "Title Benefit" shall mean Seller's
         Net  Revenue  Interest in any Well,  PUD  Location,  PDNP,  or Probable
         and/or  Possible  Locations  that is greater than or in addition to the
         Net  Revenue  Interest  set forth in  Exhibit  D, or  Seller's  Working
         Interest in any Well, PUD Location,  PDNP, or Probable  and/or Possible
         Locations that is less than the Working Interest set forth in Exhibit D
         (without a  proportionate  decrease in the Net Revenue  Interest).  The
         Title  Benefit  Value  shall  be  the  absolute  value  of  the  number
         determined by the following formula:

                   Title Benefit Value  =  [A  x  (B/C)] - A

                   A  =  Allocated Value for the affected Asset

                   B  =  Correct Net Revenue Interest for the affected Asset

                   C  =  Net Revenue Interest for the affected
                   Asset as set forth on Exhibit D.

             (b) If the Title Benefit  represents a decrease in Working Interest
         for  which  there  is  not a  proportionate  decrease  in  Net  Revenue
         Interest,  the amount of the Title Benefit Value shall be determined by
         taking into  account the  Allocated  Value of the affected  Asset,  the
         portion of the Asset affected by the Title Benefit, the legal effect of
         the Title  Benefit,  the potential  discounted  economic  effect of the
         Title  Benefit  over  the life of the  affected  Asset,  and the  Title
         Benefit Values placed upon the Title Benefit by Buyer and Seller.

             (c) If the  Parties  have not  agreed  on the  amount  of the Title
         Benefit Value of a Title Benefit by the  expiration of thirty (30) days
         after  Closing,  Seller or Buyer  shall have the right to elect to have
         such Title Benefit Value  determined by an Independent  Expert pursuant
         to Section 4.13. If the Title Benefit Value is not determined  pursuant
         to this  Agreement by the Closing,  the Purchase  Price paid at Closing
         shall be increased, subject to Section 4.14, by the Title Benefit Value
         determined by Buyer,  acting reasonably and in good faith, and, subject
         to Section 4.14.  Upon the final  determination  of Title Benefit Value
         either by mutual agreement of the Parties or by the Independent Expert,
         (i)  Seller  shall  refund to Buyer the  amount,  if any,  by which the


                                       15


         amount so paid by Buyer at Closing exceeds such Title Benefit Value, or
         (ii) Buyer shall pay to Seller the amount,  if any, by which such Title
         Benefit Value exceeds the amount so paid by Buyer at Closing.

Section 4.09 Environmental Review. Buyer may conduct an environmental assessment
of the Assets prior to the  expiration  of the Title Claim Date,  subject to the
following:

             (a) Buyer  shall  have the right to conduct a Phase I (as that term
         is  defined  by  the  American   Society  for  Testing  and  Materials)
         environmental  review  of the  Assets  prior to the  expiration  of the
         Examination  Period ("Buyer's  Environmental  Review") and Seller shall
         provide to Buyer a copy of any  environmental  review Seller has in its
         possession  subject to the same terms of  confidentiality  subsequently
         set forth herein;

                 (i) The cost and expense of Buyer's  Environmental Review shall
             be borne solely by Buyer;

                 (ii) All inspections  must be coordinated  through a designated
             representative  of Seller who may accompany Buyer during the course
             of Buyer's inspection of the Assets;

                 (iii) All  environmental  assessments  shall be conducted by an
             independent  environmental  consultant  engaged by Buyer at Buyer's
             expense;

                 (iv)  Buyer  shall give  Seller  notice not more than seven (7)
             days and not less than forty eight (48) hours  before any visits by
             Buyer and/or its consultant to the Assets, and Buyer shall seek and
             obtain  Seller's  prior  consent  (which shall not be  unreasonably
             withheld) before either it or its consultant enters the Assets;

                 (v)  Buyer  shall  provide  Seller a copy of the Phase I report
             affecting the Assets promptly after Buyer's receipt of the same;

                 (vi) Buyer shall give Seller prompt  written  notice and obtain
             Seller's prior written consent (not to be unreasonably withheld) if
             Buyer desires to conduct a Phase II (as that term is defined by the
             American  Society  for Testing  and  Materials)  study based on the
             recommendations  of Buyer's  independent  environmental  consultant
             (acting reasonably) with respect to the Assets. With respect to any
             samples  taken in  connection  with Buyer's  Environmental  Review,
             Buyer shall take split samples,  providing one of each such sample,
             properly labeled and identified, to Seller;

                 (vii) Buyer and/or its  consultant  shall perform all such work
             in a safe and workmanlike manner, shall not unreasonably  interfere
             with  Seller's  operations,  and  shall  comply  with  all  Laws of
             applicable Governmental Authorities;

                 (viii)  Buyer shall be solely  responsible  for  obtaining  any
             third party consents that are required in order to perform any work
             comprising  Buyer's  Environmental  Review, and Buyer shall consult
             with Seller prior to requesting each such third party consent; and

                                       16


                 (ix) Buyer hereby  agrees to release and defend,  indemnify and
             hold harmless Seller and Seller's  Representatives from and against
             all Claims made by (or  attributable  to the acts or omissions  of)
             Buyer or Buyer's  Representatives  (INCLUDING  THOSE RESULTING FROM
             THE SOLE, JOINT, OR CONCURRENT NEGLIGENCE (BUT NOT GROSS NEGLIGENCE
             OR WILLFUL  MISCONDUCT),  STRICT  LIABILITY OR OTHER LEGAL FAULT OF
             SELLER  OR  ANY  OF  SELLER'S  REPRESENTATIVES)  arising  out of or
             relating to Buyer's Environmental Review. The release and indemnity
             provisions  of this  Section  4.09  shall  survive  termination  or
             Closing of this Agreement  notwithstanding anything to the contrary
             provided for in this Agreement.

             (b) Unless otherwise required by applicable Laws, Buyer shall treat
         any  matters   revealed  by  Buyer's   Environmental   Review  and  any
         environmental  review  provided  by  Seller  to  Buyer,  including  any
         analyses, compilations, studies, documents, reports or data prepared or
         generated  from  such  review  (the  "Environmental  Information"),  as
         confidential,  and, except as provided below,  Buyer shall not disclose
         any  Environmental  Information to any Governmental  Authority or other
         third party without the prior written consent of Seller.  Buyer may use
         the Environmental  Information only in connection with the transactions
         contemplated by this Agreement. The Environmental  Information shall be
         disclosed  by  Buyer  to only  those  persons  who  need  to  know  the
         Environmental  Information  for purposes of evaluating the  transaction
         contemplated by this Agreement,  and who agree to be bound by the terms
         of this  Section  4.09.  If Buyer or any third  party to whom Buyer has
         provided  any  Environmental  Information  is  requested,  compelled or
         required to disclose any of the Environmental Information,  Buyer shall
         provide  Seller  with  prompt  notice  sufficiently  prior  to any such
         disclosure so as to allow Seller to file for any protective  order,  or
         seek any other remedy, as it deems appropriate under the circumstances.
         If this  Agreement is  terminated  prior to the Closing,  upon Seller's
         request  Buyer shall  deliver the  Environmental  Information,  and all
         copies thereof and works based thereon, to Seller,  which Environmental
         Information  shall  become the sole  property of Seller.  Upon  request
         Buyer shall provide copies of the  Environmental  Information to Seller
         without charge.  The terms and provisions of this Section 4.09(b) shall
         survive  any   such  termination  of  this  Agreement,
         notwithstanding anything to the contrary.

Section 4.10 Definitions Used in Article 4 and in this Agreement.
             ---------------------------------------------------

             (a) Environmental  Defects.  The term "Environmental  Defect" shall
         mean,  with  respect to any given Asset,  a violation of  Environmental
         Laws in effect as of the Effective  Time in the  jurisdiction  in which
         such Asset is located.

             (b) Governmental Authority. The term "Governmental Authority" shall
         mean the  United  States  and any  state,  county,  city and  political
         subdivisions that exercises jurisdiction,  and any agency,  department,
         board, commission or other instrumentality thereof.

                                       17


             (c) Environmental  Laws. The term  "Environmental  Laws" shall mean
         any and all laws, statutes, ordinances, rules, regulations or orders of
         any Governmental  Authority  pertaining to health and natural resources
         (but excluding laws, orders, rules, and regulations that pertain to the
         prevention of waste or the  protection of  correlative  rights) and the
         protection   of  wildlife  or  the   environment   including,   without
         limitation,  the Clean Air Act,  as  amended,  the Clean  Water Act, as
         amended, the Comprehensive Environmental,  Response,  Compensation, and
         Liability  Act of  1980,  as  amended  ("CERCLA"),  the  Federal  Water
         Pollution  Control  Act,  as amended,  the  Resource  Conservation  and
         Recovery Act of 1976, as amended ("RCRA"), the Safe Drinking Water Act,
         as amended, the Toxic Substances Control Act, as amended, the Hazardous
         & Solid  Waste  Amendments  Act of  1984,  as  amended,  the  Superfund
         Amendments and Reauthorization  Act of 1986, as amended,  the Hazardous
         Materials Transportation Act, as amended, the Oil Pollution Act of 1990
         ("OPA"),  any state laws  implementing the foregoing  federal --- laws,
         and  any  state  laws  pertaining  to  the  handling  of  oil  and  gas
         exploration and production  wastes or the use,  maintenance and closure
         of pits and impoundments,  and all other environmental  conservation or
         protection laws in effect as of the date hereof which are applicable to
         the  Assets.  For  purposes  of this  Agreement,  the terms  "hazardous
         substance,"  "release," and "disposal"  have the meanings  specified in
         the applicable Environmental Laws as in effect as of the date hereof.

             (d) Environmental Defect Value. For purposes of this Agreement, the
         term  "Environmental  Defect  Value"  shall mean,  with  respect to any
         Environmental  Defect, the estimated costs and expenses net to Seller's
         interest  in the  affected  portion  of the  Assets to  correct  and/or
         remediate such  Environmental  Defect in the most cost effective manner
         reasonably  available,  consistent with Environmental Laws, taking into
         account that non-permanent remedies (such as, by way of example but not
         by  limitation  or  similarity,  mechanisms  to  contain  or  stabilize
         hazardous  materials,  including  monitoring site  conditions,  natural
         attenuation,  risk-based corrective action,  institutional  controls or
         other  appropriate  restrictions on the use of property,  caps,  dikes,
         encapsulation,  leachate collection systems, etc.) may be the most cost
         effective manner reasonably available.

Section 4.11 Notice of Environmental  Defects. Buyer shall provide Seller notice
of all  Environmental  Defects no later than 5:00 p.m.  MST on the date which is
seven (7) days prior to the Closing Date. To be effective,  such notice must (a)
be in  writing,  (b) be  received  by  Seller  prior  to the  expiration  of the
Examination Period, (c) describe the Environmental  Defect in reasonable detail,
including the written  conclusion of Buyer that an Environmental  Defect exists,
which conclusion shall be reasonably  substantiated by the factual data gathered
in Buyer's  Environmental  Review,  (d) identify the specific Assets affected by
such Environmental  Defect, (e) set forth the procedures  recommended to correct
the Environmental  Defect,  (f) set forth Buyer's reasonable good faith estimate
of the Environmental  Defect Value,  including the basis for such estimate,  and
(g) comply with the  Environmental  Defect Value provisions of Section 4.14. Any
matters that may otherwise constitute Environmental Defects, but of which Seller
has not been  specifically  notified by Buyer in accordance  with the foregoing,
together with any environmental matter that does not constitute an Environmental
Defect,  shall be  deemed to have been  waived  by Buyer  for all  purposes  and
constitute  an Assumed  Obligation.  Upon  receipt  of notices of  Environmental
Defects,  the Parties shall meet and determine  upon which of the  Environmental
Defects,  Environmental Defect Values and methods of correction the Parties have


                                       18


reached agreement.  Upon the receipt of such effective notice from Buyer, Seller
shall have the  option,  but not the  obligation,  to  attempt  to correct  such
Environmental Defect during a period expiring ninety (90) days after Closing. If
Seller  should not elect to correct an  Environmental  Defect,  and no aspect of
such defect is in dispute,  the Purchase Price shall be adjusted for such defect
by the amount of the Environmental Defect Value.

Section 4.12 Remedies for Environmental Defects.

             (a) If, as of the  Closing  Date,  the  Assets are  affected  by an
         uncured or otherwise  unresolved  Environmental Defect noticed pursuant
         to the provisions of Section 4.11,  the affected  portion of the Assets
         shall not be sold, transferred or conveyed to Buyer at Closing, and the
         Purchase  Price  shall,  subject  to the  terms  of  Section  4.14,  be
         decreased  by the  Allocated  Value of the  portion  of the  Assets  so
         affected.  Thereafter,  Buyer and St. Mary shall act  reasonably and in
         good  faith  either  (i) to agree (y) as to the manner of cure for such
         Environmental  Defect or (z) the value of such Environmental Defect and
         adjust the Final Settlement  Statement in the amount thereof net of any
         Purchase Price adjustment made at Closing,  in which event the affected
         portion of the Assets  shall be  conveyed  to Buyer;  provided  that if
         option (y) is agreed to, no assignment  of the affected  portion of the
         Assets shall be made as between Seller and Buyer until such agreed cure
         is  accomplished  to  Buyer's  reasonable  satisfaction  whereupon  the
         Allocated  Value  previously  deducted from the Purchase Price shall be
         paid to Seller, or (ii) with respect to any Environmental  Defect as to
         which the Parties  are unable to agree  within 30 days of Closing as to
         the validity of the  Environmental  Defect,  the  Environmental  Defect
         Value, or the manner of correction, submit such matter to be determined
         by an Independent Expert pursuant to Section 4.13.

             (b) With  respect to any Asset  which is not sold,  transferred  or
         conveyed  to Buyer at the  Closing  pursuant  to the  terms of  Section
         4.12(a), after the Closing and at such time as any Environmental Defect
         Value or the  manner  of  correction  for an  Environmental  Defect  is
         determined and, in either event, the amount thereof is determined to be
         less than the Allocated  Value for the affected  portion of the Assets,
         Seller shall have the right (i) in the case of an Environmental  Defect
         Value  determination,  to have the Purchase  Price  reduced by only the
         Environmental  Defect Value as so determined or (ii) in the case of the
         cure  determination,  to  elect  to cure the  Environmental  Defect  to
         Buyer's reasonable  satisfaction.  The consequence of (i) shall be that
         Buyer will pay to Seller an amount equal to the Allocated Value for the
         affected Assets minus the  Environmental  Defect Value and the affected
         portion of the Assets  previously  retained by Seller shall be conveyed
         to Buyer. The consequence of (ii) shall be that upon achieving  Buyer's
         written acknowledgement that the Environmental Defect has been cured to
         its reasonable  satisfaction,  the Allocated  Value for such previously
         retained Asset shall be paid to Seller and the affected  portion of the
         Assets  shall be  conveyed  to  Buyer.  If no  Environmental  Defect is
         determined to exist,  Buyer shall pay the Allocated Value  attributable
         to the  affected  portion  of the Assets to  Seller,  and Seller  shall
         convey the previously  retained  portion of the Assets to Buyer. If the
         Environmental  Defect Value or the cost to cure an Environmental Defect
         is determined  to be greater than the  Allocated  Value of the affected
         portion of the Assets,  Seller shall retain the affected portion of the


                                       19


         Assets,  and the Purchase Price shall be reduced by the Allocated Value
         attributable to such portion of the Assets.

Section 4.13 Independent Experts.

             (a)  Any  disputes   regarding   Title  Defects,   Title  Benefits,
         Environmental   Defects,  Title  Defect  Value,  Title  Benefit  Value,
         Environmental  Defect Value,  appropriate  cure of any Title Defects or
         correction of any  Environmental  Defects,  and the  calculation of the
         Statement or the Final Settlement Statement, or revisions thereto, may,
         subject to the  provisions  of Section  4.04,  Section 4.12 and Section
         4.14, be submitted by a Party,  with written notice to the other Party,
         to an independent expert (the "Independent Expert"), who shall serve as
         the sole and exclusive  arbitrator of any such dispute. The Independent
         Expert shall be selected by the Parties (acting  reasonably and in good
         faith) within  fifteen (15) days  following the effective  date of said
         notice.  The  Independent  Expert shall be a person who is independent,
         impartial, and knowledgeable in the subject matter and substantive laws
         involved.  For example, but not by way of limitation,  in the case of a
         dispute  concerning  an  alleged  Environmental  Defect,  Environmental
         Defect  Value or cure of the same,  the  Independent  Expert shall have
         expertise in both the applicable  Environmental  Laws and environmental
         science relating to the oil and gas industry.

             (b)  The  Parties  shall  determine,  acting  in  good  faith,  the
         procedures to be followed to facilitate the decision of the Independent
         Expert. Such procedures shall include the following scenario:

                 (i) If the dispute  involves  the method or adequacy of cure or
             correction  of  a  Title  Defect  or  Environmental   Defect,   the
             Independent   Expert  shall  provide  in  writing  the  particulars
             necessary  to cure or correct or to remedy  any  deficient  cure or
             correction,  and  shall  provide  Seller  sixty  (60) days (or such
             additional   time   as   reasonable   and   necessary   under   the
             circumstances, but not to exceed 90 days unless specifically agreed
             to in  writing  by  Seller  and  Buyer)  to  effect  such  cure  or
             correction; and

                 (ii) In the event of  circumstances  described  in  clause  (i)
             above,  Seller at its option may at any time  during the sixty (60)
             day cure  period  pursuant  to clause  (i) (as such  period  may be
             extended  pursuant to such  clause)  decline to cure or correct the
             applicable defect.

             (c) If the Parties fail to select an Independent  Expert within the
         15-day period  referred to in Section  4.13(a) above,  within three (3)
         days  thereafter,  each of Buyer and Seller shall choose an Independent
         Expert  meeting the  qualifications  set forth above,  and such experts
         shall  promptly  choose  a  third   Independent   Expert  (meeting  the
         qualifications  provided  for  herein)  who  alone  shall  resolve  the
         disputes  between the Parties.  Each Party shall bear its own costs and
         expenses incurred in connection with any such proceeding,  and one-half
         (1/2) of the costs and expenses of the Independent Expert.

                                       20


             (d)  Disputes  to be  resolved by an  Independent  Expert  shall be
         resolved in accordance  with mutually  agreed  procedures and rules and
         failing such agreement, in accordance with the rules and procedures for
         non-administered  arbitration  set forth in the commercial  arbitration
         rules of the American Arbitration  Association.  The Independent Expert
         shall be  instructed  by the Parties to resolve such dispute as soon as
         reasonably  practicable in light of the  circumstances  using the terms
         and   provisions   of  this   Agreement   with  respect  to  title  and
         environmental matters. The decision and award of the Independent Expert
         shall be binding  upon the Parties and final and  nonappealable  to the
         maximum extent permitted by Laws or Environmental  Laws, as applicable,
         and   judgment   thereon  may  be  entered  in  a  court  of  competent
         jurisdiction  and  enforced  by any Party as a final  judgment  of such
         court.

             (e) All proceedings under this Section 4.13 shall be conducted at a
         mutually agreed location,  or if Buyer and Seller acting  reasonably do
         not mutually agree upon a location for such proceeding,  the proceeding
         shall be conducted in Denver, Colorado.

Section  4.14  Limitation  of Remedies  For Title  Benefits,  Title  Defects and
Environmental  Defects.  Notwithstanding  anything to the contrary  contained in
this Agreement,

             (a) if the Title  Defect  Value for a given  Title  Defect,  or the
         Title  Benefit  Value  of a  given  Title  Benefit,  in  each  case  as
         determined  pursuant to this Article 4 does not exceed Twenty  Thousand
         Dollars  ($20,000),  or if the  Environmental  Defect Value for a given
         Environmental Defect, as determined pursuant to this Article 4 does not
         exceed Twenty  Thousand  Dollars  ($20,000),  such Title Defect,  Title
         Benefit,  or  Environmental  Defect  shall  not  qualify  for  either a
         Purchase Price adjustment, cure, or correction of such defect;

             (b) if the  aggregate  net  value of all  Title  Defects  and Title
         Benefits  does not exceed  Five  Hundred  Thousand  Dollars  ($500,000)
         (prior to any adjustments thereto),  then no adjustment of the Purchase
         Price shall be made therefor;

             (c) if the  aggregate  net  value of all  Title  Defects  and Title
         Benefits exceeds Five Hundred Thousand Dollars ($500,000) (prior to any
         adjustments thereto),  then the Purchase Price shall be adjusted by the
         entire amount of such  aggregate net value,  it being  understood  that
         this amount is a threshold and not a deductible;

             (d) if the aggregate  value of all  Environmental  Defects does not
         exceed  Five  Hundred  Thousand  Dollars   ($500,000)   (prior  to  any
         adjustments thereto), then no adjustment of the Purchase Price shall be
         made therefor; and

             (e) if the aggregate  value of all  Environmental  Defects  exceeds
         Five Hundred  Thousand  Dollars  ($500,000)  (prior to any  adjustments
         thereto),  then the  Purchase  Price  shall be  adjusted  by the entire
         amount of such aggregate value, it being understood that this amount is
         a threshold and not a deductible.

All Title Defects and  Environmental  Defects asserted by Buyer pursuant to this
Article  4  after  being  resolved  in  accordance  with  this  Article  4 shall
thereafter constitute Permitted Encumbrances and Assumed Obligations, whether or


                                       21


not an  adjustment  to the  Purchase  Price  is made  with  respect  thereto  in
accordance with this Article 4.

Section  4.15  DISCLAIMER  AND  WAIVER.  EXCEPT AS SET FORTH IN THIS  AGREEMENT,
SELLER  DOES NOT MAKE  ANY,  AND  EXPRESSLY  DISCLAIMS  ALL  REPRESENTATIONS  OR
WARRANTIES, AND BUYER EXPRESSLY DISCLAIMS ANY SUCH REPRESENTATION OR WARRANTIES,
AS TO THE  ACCURACY  OR  COMPLETENESS  OF ANY  FILE  AND/OR  OTHER  INFORMATION,
INCLUDING, PRINTOUTS, EXTRAPOLATIONS,  PROJECTIONS, DOCUMENTATION, MAPS, GRAPHS,
CHARTS OR TABLES WHICH REFLECT, DEPICT, PRESENT, PORTRAY OR WHICH ARE BASED UPON
OR  DERIVED  FROM  ANY SUCH  INFORMATION  AND/OR  FILES,  INCLUDING  MATTERS  OF
GEOLOGICAL, GEOPHYSICAL, ENGINEERING OR OTHER SCIENTIFIC INFORMATION THAT MAY BE
PROVIDED  TO BUYER BY SELLER OR BY OTHERS ON BEHALF OF SELLER.  BUYER  EXPRESSLY
AGREES THAT ANY CONCLUSIONS  DRAWN FROM REVIEW OF SUCH INFORMATION  AND/OR FILES
SHALL BE THE RESULT OF ITS OWN INDEPENDENT REVIEW AND JUDGMENT.

                                   ARTICLE 5

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Each Party  comprising  Seller  severally  as to its or his  respective
ownership interest in the Assets represents and warrants to Buyer that:

Section  5.01  Existence.  St. Mary is a  corporation  duly  organized,  validly
existing and in good standing under the laws of the State of Delaware.  Smith is
a trust organized,  validly existing, and in good standing under the laws of the
State of Oklahoma.  Harrell is an individual.  Each Party comprising  Seller has
full legal  power,  right and  authority to carry on its business as such is now
being  conducted  and  as  contemplated  to  be  conducted  hereby.  Each  Party
comprising  Seller is authorized to do business,  and in good  standing,  in the
State or States in which the Assets  are  located  with  regard to the Assets in
which any of the Parties comprising Seller has an interest.

Section 5.02 Legal Power. Seller has the legal power and right to enter into and
perform  this  Agreement  and  the   transactions   contemplated   hereby.   The
consummation  of the  transactions  contemplated  by  this  Agreement  will  not
violate, or be in conflict with:

             (a) any provision of Seller's  articles of  incorporation,  bylaws,
         and other governing documents;

             (b)  except for  provisions  customarily  contained  in oil and gas
         agreements  relating to maintenance of uniform  interest,  preferential
         purchase rights and consents to assignment,  any material  agreement or
         instrument  to which Seller is a party or by which Seller or the Assets
         are bound; or

             (c) any judgment, order, ruling or decree applicable to Seller as a
         party in interest or any law, rule or regulation applicable to Seller.

                                       22


Section  5.03  Execution.  The  execution,  delivery  and  performance  of  this
Agreement  and  the  transactions  contemplated  hereby  are  duly  and  validly
authorized by all requisite  corporate  action on the part of Seller as required
under its formation documents.  This Agreement  constitutes the legal, valid and
binding obligation of Seller enforceable in accordance with its terms, except as
the same may be limited by  bankruptcy,  insolvency or other laws relating to or
affecting  the  rights  of  creditors   generally,   and  by  general  equitable
principles.

Section  5.04  Brokers.  No broker or finder is  entitled  to any  brokerage  or
finder's fee, or to any commission, based in any way on agreements, arrangements
or understandings  made by or on behalf of Seller or any affiliate of Seller for
which  Buyer has or will have any  liabilities  or  obligations  (contingent  or
otherwise).

Section 5.05 Bankruptcy. There are no bankruptcy,  reorganization or arrangement
proceedings  pending,  being  contemplated  by or to  the  knowledge  of  Seller
threatened  against  Seller.  Seller is not  "insolvent" as such term is defined
under the Federal  Bankruptcy  Code or any  fraudulent  transfer  or  fraudulent
conveyance  statute   applicable  to  the  transactions   contemplated  by  this
Agreement.

Section 5.06 Suits and Claims. Except as set forth in Schedule 5.06, there is no
litigation  or Claims  that have  been  filed by any  person or entity or by any
administrative agency or Governmental Authority in any legal,  administrative or
arbitration  proceeding or, to Seller's knowledge,  threatened against Seller or
the Assets that would impede  Seller's  ability to consummate  the  transactions
contemplated herein or would have a material and adverse effect on the Assets.

Section 5.07 Taxes.  During the period of Seller's ownership of the Assets up to
and  including  the  Effective  Time,  Seller has caused to be timely  filed all
material  Tax returns  relating  to the Assets.  Seller has paid or caused to be
paid all ad valorem, property,  production,  severance,  mineral documentary and
similar  Taxes based upon or measured by its  ownership of or the  production of
Hydrocarbons  from the Assets.  Seller has not  received  written  notice of any
pending Claim against Seller from any applicable taxing authority for assessment
of Taxes  with  respect  to the  Assets.  There  are no  audits of Seller by any
applicable  taxing  authority with respect to Taxes  attributable to the Assets.
Except for statutory liens for property Taxes and ad valorem Taxes, there are no
tax liens on or with respect to the Assets.

Section  5.08  AFEs.  Except  as  set  forth  on  Schedule  5.08,  there  are no
outstanding  authorizations for expenditures or other capital  commitments which
are binding on the Assets and which  individually would require the owner of the
Assets after the  Effective  Time to expend  monies in excess of Fifty  Thousand
Dollars ($50,000).

Section 5.09 Compliance with Laws.  Seller's  operation  (i.e.,  where Seller is
operator  of  record)  of the  Assets  has been in  compliance  with Laws  where
noncompliance with such Laws would have a Material Adverse Effect on the Assets.

Section 5.10  Contracts.  Seller is not in Breach of any of the Contracts and to
Seller's  knowledge,  the  Contracts  are in full force and effect in accordance
with their terms,  and, to the knowledge of Seller, no other party to any of the
Contracts is in Breach thereof.

                                       23


Section 5.11 Production Imbalances.  Except as set forth in Schedule 1.02(g), to
Seller's  knowledge,  there  are no  material  Production  Imbalances  as of the
Effective Time as to any of the Subject Interests.

Section 5.12 Royalties;  Payments for Production. Seller has not been and is not
in Breach of any  payment  obligations  under any of the  Leases.  Seller is not
obligated by virtue of a take or pay payment, call, advance payment,  production
payment or other similar payment or obligation (other than royalties, overriding
royalties  and similar  arrangements  that do not cause  Seller's NRI to be less
than that set forth on Exhibit D), to deliver Hydrocarbons, or proceeds from the
sale thereof,  attributable to the Leases at some future time without  receiving
payment  therefor at or after the time of delivery at the then market price, and
no take or pay credits must be provided  before  natural gas can be  transported
through  any  interstate  carrier  under FERC Order 500, et al, and there are no
obligations on the Assets under FERC Order 451.

Section 5.13 Insurance. Seller maintains, and through the Closing will maintain,
with respect to the Assets, the insurance coverage described on Schedule 5.13.

Section 5.14  Plugging  Obligations.  Except for wells listed in Schedule  5.14,
there are no dry holes, or shut in or otherwise  inactive wells,  located on the
Assets or lands  pooled  or  unitized  therewith  that  Seller  has  either  the
obligation  to plug and  abandon  in  accordance  with an  applicable  operating
agreement or Law or as to Wells for which Seller is not the operator, received a
written proposal to plug and abandon.

Section  5.15  Personal  Property  and  Equipment.  Seller  is the  owner of the
Equipment  free and clear of all liens and  encumbrances  other than those to be
released at Closing.  Other than in connection with normal and customary prudent
operations,  Seller has not removed any personal property, equipment or fixtures
from the Wells, unless it has been replaced with personal property, equipment or
fixtures of similar grade and utility. Unless removed,  repaired or replaced (a)
with personal  property,  equipment and fixtures of similar grade and utility or
(b) in connection  with normal and customary  prudent  operations,  the personal
property,  equipment  and  fixtures  currently  attendant  to the  Wells was the
equipment  historically  used by Seller on the Wells to produce the Hydrocarbons
prior to the execution of this Agreement.

Section 5.16 No Alienation.  Within 120 days of the date hereof,  Seller has not
voluntarily  or  involuntarily  sold,  assigned,  conveyed,  or  transferred  or
contracted  to sell,  assign,  convey  or  transfer  any  right or title  to, or
interest in, the Assets other than (i) production sold in the ordinary course of
Seller's  business and (ii) equipment which was worthless,  obsolete or replaced
by equipment of equal suitability and value.

Section 5.17  Hydrocarbon  Sales  Contracts.  Except for the  Hydrocarbon  Sales
Contracts  listed in  Schedule  5.17,  no  Hydrocarbons  are  subject to a sales
contract (other than division orders or spot sales  agreements  terminable on no
more than 30 days notice) and no person has any call upon, option to purchase or
similar rights with respect to the production from the Assets. Proceeds from the
sale of oil,  condensate,  and gas from the  Assets  are being  received  in all
respects by Seller in a timely manner and are not being held in suspense for any
reason.

                                       24


Section  5.18  Area  of  Mutual  Interest  and  Other  Agreements.  To  Seller's
knowledge,  no Asset is  subject  to (or has  related  to it) any area of mutual
interest  agreements  not  disclosed in the Contracts or any farm-out or farm-in
agreement  under which any party thereto is entitled to receive  assignments not
yet made, or could earn  additional  assignments  after the Effective Time other
than the Wells listed on Exhibit B as having an after payout NRI.

Section 5.19 Leases.  Seller has not received a written notice of termination of
any of the Leases and Seller is not in Breach or violation of any of the Leases;
provided,   however,   that  Buyer's   remedy  for   Seller's   Breach  of  this
representation  and warranty  shall be the Title Defect  mechanism  set forth in
Article 4.

Section 5.20 Property Expenses.  In the ordinary course of business,  Seller has
paid all  property  expenses  attributable  to the  period of time  prior to the
Effective Time as such property  expenses become due, and such property expenses
are being paid in a timely manner before the same become delinquent, except such
property expenses as are disputed in good faith by Seller in a timely manner and
for which Seller shall retain responsibility.

Section 5.21 Governmental Permits.  Except as set forth on Schedule 5.21, Seller
has all Permits (including,  without  limitation,  permits,  licenses,  approval
registrations,  notifications,  exemptions and any other authorizations pursuant
to Law)  necessary  or  appropriate  to own and operate the Assets as  presently
being  owned and  operated.  The  Permits  are in full  force and effect and the
Assets have been operated in  accordance  with the terms thereof in all material
respects. Seller has not received written notice of any violations in respect of
any of the Permits that remain uncured.

Section 5.22 No Adverse  Change.  With respect to the Assets for which Seller is
the  operator  and, to Seller's  knowledge  with respect to the Assets for which
Seller is not the  operator,  since  September  1, 2007,  the  Assets  have been
operated in the ordinary  course of business  consistent with past practices and
there has been no event or series of events that have either  individually or in
combination had a Material Adverse Effect on the Assets.

Section 5.23  Information.  The  information  pertaining to revenue and expenses
attributable   to  the  Assets   that  Seller  has   furnished   to  Buyer  (the
"Information")  is (a) accurate in all material  respects to the extent relating
to the period of Seller's  ownership  of the Assets and (b) to the  knowledge of
Seller,  accurate in all material  respects to the extent relating to any period
of ownership  of the Assets  prior to the time owned by Seller  reflected in the
Information.  Seller has no data in its possession that it has failed to furnish
that  would  cause  the  Information  to be  materially  inaccurate.  Except  as
specifically  set forth in this Section  5.23,  Seller makes no  representations
regarding  the accuracy of any of the Records;  provided,  however,  Seller does
represent that (i) all of the Records are files, or copies thereof,  that Seller
has used in the ordinary course of operating and owning the Assets,  (ii) Seller
has not intentionally  withheld any material  information from the Records,  and
(iii) Seller has not knowingly  misrepresented  any material  information in the
Records. Except as set froth in this Section 5.23, no representation or warranty
of any kind is made by  Seller  as to the  Information  or with  respect  to the
Assets to which the  Information  relates  and Buyer  expressly  agrees that any
conclusions  drawn therefrom  shall be the result of its own independent  review
and judgment.  The  representations  and warranties  contained in this paragraph
shall  apply only to matters  of fact,  and shall not apply to any  information,


                                       25


data,  printouts,  extrapolations,  projections,  documentation,  maps,  graphs,
charts, or tables which reflect,  depict,  present,  portray,  or represent,  or
which are based upon or derived from, in whole or in part, interpretation of the
Information including,  but not limited to, matters of geological,  geophysical,
engineering, or scientific interpretation.

Section 5.24 Representations and Warranties  Exclusive.  All representations and
warranties  contained in this Article 5 are exclusive,  and are given in lieu of
all other representations and warranties, express, implied or statutory.

                                   ARTICLE 6

                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Seller that:

Section  6.01  Existence.  Buyer is a limited  liability  company  duly  formed,
organized,  validly existing and in good standing under the laws of the state of
its formation.  Buyer has full legal power,  right and authority to carry on its
business as such is now being  conducted.  As of the Closing Date, Buyer will be
authorized  to do business as a foreign  limited  liability  company and in good
standing in the State or States in which the Assets are located.

Section 6.02 Legal Power.  Buyer has the legal power and right to enter into and
perform  this  Agreement  and  the   transactions   contemplated   hereby.   The
consummation  of the  transactions  contemplated  by this Agreement does not and
will not violate, or be in conflict with:

             (a) any provision of Buyer's formation documents or other governing
         documents;

             (b) any material  agreement or instrument to which Buyer is a party
         or by which Buyer or its assets are bound; or

             (c) any judgment,  order, ruling or decree applicable to Buyer as a
         party in interest or any law, rule or regulation applicable to Buyer.

Section  6.03  Execution.  The  execution,  delivery  and  performance  of  this
Agreement  and  the  transactions  contemplated  hereby  are  duly  and  validly
authorized by all  requisite  organizational  action on the part of Buyer.  This
Agreement   constitutes  the  legal,  valid  and  binding  obligation  of  Buyer
enforceable in accordance  with its terms,  except as the same may be limited by
bankruptcy,  insolvency  or other laws  relating to or  affecting  the rights of
creditors generally, and by general equitable principles.

Section  6.04  Brokers.  No broker or finder is  entitled  to any  brokerage  or
finder's fee, or to any commission, based in any way on agreements, arrangements
or  understandings  made by or on behalf of Buyer or any  affiliate of Buyer for
which Seller has or will have any  liabilities  or  obligations  (contingent  or
otherwise).

                                       26


Section 6.05 Bankruptcy. There are no bankruptcy,  reorganization or arrangement
proceedings  pending,  being  contemplated  by  or to  the  knowledge  of  Buyer
threatened against Buyer or any affiliate of Buyer.

Section  6.06 Suits and Claims.  There is no Claim by any person or entity or by
any administrative agency or Governmental Authority and no legal, administrative
or arbitration  proceeding pending or, to Buyer's knowledge,  threatened against
Buyer or any  affiliate  of Buyer that is  reasonably  likely to have a material
effect on Buyer's ability to consummate the transactions contemplated herein.

Section  6.07  Independent   Evaluation.   Buyer  acknowledges  that  it  is  an
experienced  and  knowledgeable  investor in the oil and gas  business,  and the
business of purchasing,  owning, developing and operating oil and gas properties
such  as  the  Assets.  If  Closing  occurs,  Buyer  represents,   warrants  and
acknowledges to Seller that it has had full access to the Assets,  the officers,
and employees of Seller, and to the books,  records and files of Seller relating
to the  Assets.  In making  the  decision  to enter into this  Agreement  and to
consummate the transactions  contemplated  hereby,  Buyer has relied solely upon
the  representations,  warranties,  covenants and agreements of Buyer and Seller
set forth in this  Agreement  and  Buyer's own  independent  due  diligence  and
investigation  of the Assets,  and has been advised by and has relied  solely on
its own expertise and its own legal, tax, operations,  environmental,  reservoir
engineering  and  other  professional   counsel  and  advisors  concerning  this
transaction,  the Assets and the value thereof. In addition,  Buyer acknowledges
and agrees  that Buyer will be or has been  advised by and relies  solely on its
own  expertise,  and its legal  counsel and any  advisors or experts  concerning
matters relating to Title Defects, Title Benefits and Environmental Defects.

Section  6.08  Qualification.  As of  the  Closing,  the  Buyer  shall  be,  and
thereafter  shall continue to be,  qualified  with all  applicable  Governmental
Authorities  to own and  operate  the  Assets,  including  meeting  all  bonding
requirements.

Section 6.09 Securities  Laws. Buyer is acquiring the Assets for its own account
or that of its  affiliates  and not with a view to,  or for  offer of  resale in
connection  with, a distribution  thereof,  within the meaning of the Securities
Act of 1933, 15 U.S.C.  ss. 77a et seq., and any other rules,  regulations,  and
laws  pertaining  to the  distribution  of  securities.  Buyer has not sought or
solicited,  nor is Buyer participating with, investors,  partners or other third
parties other than its lenders in order to fund the Purchase  Price and to close
this  transaction,  and all  funds to be used by Buyer in  connection  with this
transaction are Buyer's own funds or those borrowed from its lenders.

Section 6.10 No Investment Company.  Buyer is not (a) an investment company or a
company controlled by an investment company within the meaning of the Investment
Company Act of 1940, as amended, or (b) subject in any respect to the provisions
of that Act.

Section  6.11 Funds.  Buyer has  arranged to have  available by the Closing Date
immediately available funds to enable Buyer to pay in full the Purchase Price as
herein provided and otherwise to perform its obligations under this Agreement.

                                       27


Section 6.12 Notice of Changes. Promptly upon its discovery or identification of
same,  but in any event prior to Closing,  Buyer shall provide to Seller written
notice  of any  matter it so  identifies  that has a  material  effect on any of
Seller's  representations  or warranties under this Agreement,  or rendering any
such warranty or representation untrue or inaccurate.

Section 6.13 Representations and Warranties  Exclusive.  All representations and
warranties contained in this Agreement and the documents delivered in connection
herewith, are exclusive,  and are given in lieu of all other representations and
warranties, express, implied or statutory.

                                   ARTICLE 7

                             OPERATION OF THE ASSETS

Section 7.01 Operation of the Assets.

             (a) From and after the date of  execution  of this  Agreement,  and
         subject to the provisions of applicable operating and other agreements,
         Seller shall (i) use its reasonable  efforts during the period prior to
         the  Closing,  to  operate  and  administer  the  Assets  in  a  manner
         consistent with its past practices,  (ii) make payment of all costs and
         expenses  attributable  to the ownership or operation of the Assets and
         relating to the period  prior to the transfer of  operations  to Buyer,
         and  shall  carry  on  its  business  with  respect  to the  Assets  in
         substantially  the same manner as before  execution of this  Agreement,
         (iii)  not,  without  Buyer's  express  written   consent,   commit  to
         participate  in the  drilling  of any well,  or make or enter  into any
         other  commitments  reasonably  anticipated  to require  future capital
         expenditures by Buyer in excess of $50,000 net to Seller's interest for
         each proposed operation, or terminate,  materially amend, or extend any
         Contracts  affecting the Assets,  or enter into or commit to enter into
         any new  material  contract or  agreement  relating  to the Assets,  or
         settle,  compromise or waive any material right relating to the Assets,
         (iv)  maintain  insurance  coverage on the Assets in the amounts and of
         the types presently in force, (v) maintain in full force and effect the
         Leases,  the Surface Agreements and other Assets, and pay all costs and
         expenses  and  perform  all  material  obligations  of the owner of the
         Assets  promptly  when  due,  (vi)  maintain  all  Permits,  (vii)  not
         transfer,  sell,  hypothecate,  encumber,  or otherwise  dispose of any
         Assets except for sales and  dispositions of  Hydrocarbons  made in the
         ordinary  course of business  consistent  with Seller's past practices,
         (viii) not grant or create any preferential right to purchase, right of
         first  opportunity  or other transfer  restriction or requirement  with
         respect  to the  Assets  except  in  connection  with  the  renewal  or
         extension  of Assets after the  Effective  Time if granting or creating
         such right or  requirement  is a condition of such renewal or extension
         and then with prompt written  notice of such action to Buyer,  (ix) not
         elect to become a nonconsenting  party in any operation proposed by any
         other  Person with respect to the Assets  unless  requested to do so in
         writing by Buyer,  (x)  maintain  the  Equipment  in at least as good a
         condition as it is on the date hereof, ordinary wear and tear excepted,
         (xi) not make any  change in any  method of  accounting  or  accounting
         practice or policy with  respect to the Assets,  and (xii) not agree to
         extend  any  statute  of  limitations  with  respect  to  Taxes  or any
         extension of time with respect to a Tax  assessment or  deficiency  for
         any Taxes,  or make any change in any Tax elections with respect to the
         Assets.

                                       28


             (b) Buyer acknowledges that Seller owns undivided interests in some
         or all of the Assets,  and Buyer  agrees that the acts or  omissions of
         the other working  interests owners shall not constitute a violation of
         the  provisions  of this Article 7, nor shall any action  required by a
         vote of working interest owners  constitute such a violation so long as
         Seller  has voted its  interests  in a manner  that  complies  with the
         provisions  of this  Article 7. Seller  will,  without  penalty for the
         failure  to do so except to the extent  that the  failure to give Buyer
         such  notice  has a  Material  Adverse  Effect,  notify  Buyer  of  the
         occurrence of such event to the extent of Seller's knowledge.

             (c) Promptly upon its discovery or  identification  of same, but in
         any event prior to Closing,  Seller shall provide Buyer written  notice
         of any matter Seller  identifies that has a material  adverse effect on
         or that constitutes a Breach of Seller's  representations or warranties
         under this Agreement.

Section 7.02 Buyer's  Qualification.  At Closing,  Buyer shall be qualified  and
shall meet all requirements,  including bonding  requirements,  to be designated
operator of that portion of the Assets for which Seller serves as operator.

Section 7.03 Operation of the Assets after the Closing.
             -----------------------------------------

             (a) Seller shall not be obligated to continue  operating any of the
         Assets following the Closing, and, subject to Seller's retention of the
         Retained  Liabilities,  Buyer hereby  assumes full  responsibility  for
         operating  (or  causing  the  operation  of) all Assets  following  the
         Closing for which  Seller is the  operator  prior to the Closing  Date.
         Seller  shall make its  employees  and  contractors  available to Buyer
         prior to the Closing as may be  reasonably  necessary  to assist in the
         transition if Buyer  becomes the  operator.  Seller does not warrant or
         guarantee  that Buyer will  become  the  operator  of the Assets or any
         portion  thereof,  as such matter will be controlled by the  applicable
         joint operating agreement(s) and other applicable agreement(s). Without
         implying any  obligation  on Seller's  part to continue  operating  any
         Assets  after the Closing,  if Seller  elects,  at its sole option,  to
         continue to operate any Assets  following the Closing at the request of
         Buyer, or by any third party working  interest owner due to constraints
         of  applicable  joint  operating   agreement(s)  and  other  applicable
         agreement(s),  failure of a successor operator to take over operations,
         or for other reasonable cause, such continued operation by Seller shall
         be for the account of Buyer,  and at the sole risk, cost and expense of
         Buyer.  Buyer agrees to release and defend,  indemnify  and hold Seller
         and its Representatives  harmless from Claims,  including any Claims of
         Buyer or its  affiliates  or  successors  and  assigns  relating in any
         manner  directly or  indirectly  to the  operation  of the Assets after
         Closing  (INCLUDING  THOSE  CLAIMS  RESULTING  FROM THE SOLE,  JOINT OR
         CONCURRENT NEGLIGENCE (BUT NOT GROSS NEGLIGENCE OR WILLFUL MISCONDUCT),
         STRICT  LIABILITY  OR OTHER  LEGAL  FAULT OF SELLER OR ANY OF  SELLER'S
         REPRESENTATIVES).

             (b) In  consideration of any conduct of operations of the Assets by
         Seller on behalf of Buyer after  Closing,  Buyer shall pay Seller a fee
         equal to Two Hundred  Dollars  ($200.00) per month per Well,  including
         all other wells,  such as, by way of example and not  limitation,  salt
         water disposal wells,  wells that are  temporarily  abandoned and wells


                                       29


         that are  otherwise  inactive,  as  reimbursement  for all  general and
         administrative   overhead   ("Overhead  Fee")  incurred  by  Seller  in
         connection  with the conduct of operations of the Assets.  In the event
         Seller transfers  operations to Buyer or its designee between the first
         and last day of a calendar  month,  Seller shall be paid such amount of
         the  Overhead  Fee  prorated  over the  number of days in which  Seller
         conducted  operations  for such month.  The amount of the  Overhead Fee
         owing to Seller by Buyer shall be paid upon the Final Settlement Date.

Section 7.04 Post Closing  Accounting  by Seller.  In the event Seller agrees to
operate the Assets after Closing,  Seller shall perform the following accounting
tasks subject to the limitations provide for herein:

             (a) Seller will continue to pay royalties and severance, production
         and similar Taxes for sales through the production  month following the
         month in which Closing occurs ("Post-Closing Production Month"). If any
         revenue is received by Seller for later months,  it will be credited to
         Buyer in the Final Settlement Statement; provided however, Seller shall
         not be  obligated  to and will  not pay any  royalties  and  severance,
         production   and  similar  Taxes,   if  applicable,   with  respect  to
         Hydrocarbons produced after the Post-Closing Production Month.

             (b) Seller will continue to pay or bill joint  interest  owners for
         expenses through the Post-Closing  Production Month. All later expenses
         will be either  accumulated or charged to Buyer in the Final Settlement
         Statement, or the invoices will be returned to the vendor for rebilling
         to Buyer. Seller will continue to pay to the operator of any Assets not
         operated by Seller for joint  billings for the billing  month after the
         month in which  Closing  occurs.  All  subsequent  bills will either be
         returned to the applicable operator for rebilling to Buyer or forwarded
         to Buyer for  payment,  or if already  paid by Seller,  will be charged
         against Buyer in the Final Settlement  Statement.  Seller will continue
         to prepare all regulatory and other monthly  production reports through
         the Post-Closing  Production Month. Copies of such reports attributable
         to the period after the Effective Time will be provided to Buyer, along
         with the final ending inventory balance.

             (c) Seller  will  continue to pay all  shut-in  royalties,  minimum
         royalties,  delay rentals and other lease payment  obligations  through
         the Post-Closing Production Month.

             (d) Seller shall market and nominate all  Hydrocarbons  in the same
         manner as Seller has been marketing and nominating Hydrocarbons.

Section 7.05  Limitations  on Liability  of Operator.  Notwithstanding  anything
herein to the  contrary,  in the event Seller or an  affiliate of Seller  should
assume  any  accounting  functions  on behalf of Buyer  from and after  Closing,
notwithstanding  anything to the contrary provided herein,  Seller shall have no
liability to Buyer for, and Buyer hereby agrees to release and defend, indemnify
and hold  harmless  Seller  and  Seller's  Representatives  harmless  from,  the
incorrect  payment of  expenses,  Taxes,  billings,  delay  rentals,  royalties,
minimum royalties,  payments required by any of the Leases, shut-in royalties or
similar payments, or for any failure to pay any such payments through mistake or
oversight  (INCLUDING  THOSE  RESULTING  FROM  THE  SOLE,  JOINT  OR  CONCURRENT


                                       30


NEGLIGENCE (BUT NOT GROSS NEGLIGENCE OR WILLFUL MISCONDUCT), STRICT LIABILITY OR
OTHER LEGAL FAULT OF SELLER OR ANY OF SELLER'S  REPRESENTATIVES)  from and after
the Effective Time,  except to the extent of any amounts  included in the upward
Purchase Price  Allocations and Adjustment made pursuant to Section 10.02. In no
event shall Buyer's  remedy for Breach of  obligations  by Seller (or any of its
Representatives)  under this Article 7 exceed the Allocated Value of the Subject
Interest affected by such Breach.

Section 7.06 Public  Announcements.  Prior to the Closing,  neither  Party shall
make any press release or other public  announcement  regarding the existence of
this Agreement,  the contents  hereof or the  transactions  contemplated  hereby
other  than the Press  Releases  set  forth on  Exhibit  F-1 and F-2;  provided,
however,  the foregoing shall not restrict  disclosures by Buyer or Seller which
are required by applicable  securities or other Laws or the applicable  rules of
any  stock  exchange  having  jurisdiction  over  the  disclosing  party  or its
Affiliates.  Following Closing,  the Parties shall issue a Press Release in form
and substance to be agreed upon by the Parties prior to the Closing.

Section 7.07  Disclosure  Information.  Seller  agrees (i) to provide Buyer with
Disclosure Information (as defined below) necessary for Buyer to comply with the
disclosure  requirements of the Securities Exchange Act of 1934, as amended, and
Regulation  S-X under the  Securities  Act of 1933,  as  amended,  no later than
thirty (30) days  following  the Closing Date and (ii)  reasonably  to cooperate
with and assist  Buyer in an audit of the Assets.  As used  herein,  "Disclosure
Information"  means,  as to the  Assets,  the  net  revenues,  direct  operating
expenses  (including  production,  property and similar Taxes),  exploratory and
development costs, production volumes, information necessary for the preparation
of the disclosures  required under Statement of Financial  Accounting  Standards
No. 69, and balance sheet and other income  statement data  associated  directly
with the Assets that Buyer  reasonably  believes  are required to be included in
any  report  filed by Buyer or any of its  Affiliates  with the  Securities  and
Exchange Commission ("SEC"). If Seller shall fail to furnish Buyer with a set of
the  Disclosure  Information  within the 30 day period set forth in this Section
7.07 which Seller reasonably believes in its good faith judgment allows Buyer to
substantially  comply  with  the  rules  and  regulations  of the SEC  and  such
compliance  reasonably requires Buyer's reliance on the Disclosure  Information,
Seller shall pay to Buyer the sum of One Hundred Thousand Dollars  ($100,000) as
liquidated  damages for this failure to provide the  Disclosure  Information  to
Buyer as required by this Section  7.07.  If Seller shall fail to furnish  Buyer
with a set of the Disclosure Information which Seller reasonably believes in its
good faith  judgment  allows  Buyer to  substantially  comply with the rules and
regulations of the SEC and such compliance  reasonably requires Buyer's reliance
on the Disclosure  Information,  for an additional  period of 30 days beyond the
previously stated 30-day period, Seller shall pay to Buyer the additional sum of
Five Hundred Thousand Dollars  ($500,000) as liquidated damages for such Breach.
The Parties  agree that the damages  attributable  to any Breach as described in
this Section 7.07 would be difficult,  if not impossible to ascertain,  and that
the amounts set forth herein are reasonable under the  circumstances  and do not
constitute a penalty.

The fact that the SEC subjects any filing by Buyer to review or  supplementation
shall not create any  presumption  of a Breach by Seller of its  obligations  as
contained  in this  Section  7.07.  Seller  shall  have no  liability  to  Buyer
whatsoever  with  regard to either  (i) any  registration  rights  agreement  or


                                       31


obligation involving Buyer, or (ii) the pricing, salability, market response, or
any other  matter  relating  to the  issuance  or sale of any  security by or on
behalf of Buyer.

                                   ARTICLE 8

                       CONDITIONS TO OBLIGATIONS OF SELLER

         The obligations of Seller to consummate the  transactions  provided for
herein are subject,  at the option of Seller,  to the fulfillment on or prior to
the Closing Date of each of the following conditions:

Section 8.01 Representations. The representations and warranties of Buyer herein
contained shall be true and correct in all material respects on the Closing Date
as though made on and as of such date;

Section 8.02 Performance.  Buyer shall have performed all material  obligations,
covenants and agreements contained in this Agreement to be performed or complied
with by it at or prior to the Closing and shall have taken the actions set forth
in Section 10.08; and

Section 8.03  Pending  Matters.  No suit,  action or other  proceeding  shall be
pending or threatened  that seeks to, or could  reasonably  result in a judicial
order, judgment or decree that would, restrain, enjoin or otherwise prohibit the
consummation of the transactions contemplated by this Agreement.

                                   ARTICLE 9

                       CONDITIONS TO OBLIGATIONS OF BUYER

         The  obligations  of Buyer to consummate the  transaction  provided for
herein are subject,  at the option of Buyer,  to the  fulfillment on or prior to
the Closing Date of each of the following conditions:

Section 9.01  Representations.  (a) The representations and warranties of Seller
contained in Section 5.02 through  Section  5.06,  inclusive,  shall be true and
correct in all material respects on the Closing Date as though made on and as of
such date,  and (b) no action or omission of Seller or event shall have occurred
during the period of time commencing upon the expiration of the Title Claim Date
and  ending  on  the   Closing   Date  which   shall  have  caused  any  of  the
representations  and  warranties  of Seller  contained  in Section  5.07 through
Section 5.23, inclusive,  not to be true and correct in all material respects on
the Closing Date as though made on and as of such date;

Section 9.02 Performance.  Seller shall have performed all material obligations,
covenants and agreements contained in this Agreement to be performed or complied
with by it at or prior to the Closing and shall have taken the actions set forth
in Section 10.07;

Section 9.03  Pending  Matters.  No suit,  action or other  proceeding  shall be
pending or threatened  that seeks to, or could  reasonably  result in a judicial


                                       32


order,  judgment or decree that would,  restrain,  enjoin, or otherwise prohibit
the consummation of the transactions contemplated by this Agreement; and

Section 9.04 Wachovia  Liens.  Seller shall have  delivered to Buyer releases of
all Wachovia Liens and any other liens,  charges or  encumbrances  on the Assets
other than Permitted  Encumbrances  in form suitable for recording or filing (as
applicable) and such releases shall be reasonably satisfactory to Buyer.

                                   ARTICLE 10

                                   THE CLOSING

Section 10.01 Time and Place of the Closing.  If the  conditions  referred to in
Article  8 and  Article  9  have  been  satisfied  or  waived  in  writing,  the
transactions  contemplated by this Agreement (the "Closing") shall take place at
the offices of Seller at 9:00 a.m. MST on January 31, 2008 (the "Closing Date").

Section 10.02 Allocation of Costs and Expenses and Adjustments to Purchase Price
at the Closing.

             (a) At the Closing,  the  Purchase  Price shall be increased by the
         following amounts:

                 (i) the amount of all (A) paid ad valorem,  property or similar
             Taxes and  assessments  based upon or measured by the  ownership of
             the  Assets,  insofar as such Taxes  relate to periods of time from
             and after the Effective  Time, and (B) paid charges,  and costs and
             expenses of any kind or nature that are  attributable to the Assets
             and the period from and after Effective Time;

                 (ii)   all   expenses,    including   operating   and   capital
             expenditures,  incurred  and  paid by or on  behalf  of  Seller  in
             connection  with  ownership,   operation  and  use  of  the  Assets
             attributable  to the period from and after the Effective  Time, and
             including the costs incurred in connection  with the AFEs described
             on Schedule 5.08 which costs shall be the  responsibility  of Buyer
             notwithstanding  that they may have accrued  prior to the Effective
             Time;

                 (iii) all royalties,  rentals,  insurance  premiums  (including
             property  and business  interruption  coverage)  and other  charges
             attributable  to the Assets  for the period of,  from and after the
             Effective Time to the extent paid by or on behalf of Seller;

                 (iv) expenses  incurred under applicable  operating  agreements
             including  any  overhead  charges  allowable  under the  applicable
             operating   procedure   (COPAS)   where   Seller  is   non-operator
             attributable  to the  Assets  for the  period of from and after the
             Effective  Time to the extent  paid by or on behalf of Seller  (the
             costs  and  expenses  for  which  Seller  shall  receive  an upward
             adjustment  to the Purchase  Price  pursuant to clauses (i) through
             (iv)  inclusive,  shall be  referred to as the  "Interim  Operating
             Expenses");

                                       33


                 (v) all upward  Purchase Price  adjustments  for Title Benefits
             determined in accordance with Article 4;

                 (vi) the  value of all oil,  gas and  natural  gas  liquids  in
             storage  or in the  pipelines  as of the  Effective  Time  that  is
             credited  to  the  Assets,  such  value  (A)  for  purposes  of the
             Statement,  to be the actual  price  received  for such oil, gas or
             natural gas liquids  upon the first  unaffiliated  third party sale
             thereof,  if available,  and upon such  estimates as are reasonably
             agreed upon by the Parties,  to the extent  actual  amounts are not
             known at  Closing,  and (B) for  purposes  of the Final  Settlement
             Statement, to be based upon actual amounts; and

                 (vii) any other amount provided for in this Agreement or agreed
             upon in writing by Buyer and Seller.

             (b) At the Closing,  the  Purchase  Price shall be decreased by the
         following amounts:

                 (i) the Deposit;

                 (ii) an amount  equal to the sales  price paid to Seller by the
             first purchaser of the Hydrocarbons  produced,  saved and sold from
             the Subject  Interests  from the Effective Time to the Closing Date
             (without  deductions  of any  kind or  nature,  including,  but not
             limited to,  royalties  and any Taxes based on  production),  which
             shall (A) for  purposes  of the  Statement,  be based  upon  actual
             amounts,  if available,  and upon such  estimates as are reasonably
             agreed upon by the Parties,  to the extent  actual  amounts are not
             known at  Closing,  and (B) for  purposes  of the Final  Settlement
             Statement, be based upon actual amounts;

                 (iii) an  amount  equal to all cash  in,  or  attributable  to,
             suspense  accounts held by Seller  relating to the Assets for which
             Buyer has assumed responsibility under Section 12.01;

                 (iv) the Allocated Value of any Asset sold prior to the Closing
             to the holder of a preferential right pursuant to Section 4.06;

                 (v) the Allocated Value of any Asset excluded from the purchase
             and sale contemplated  herein pursuant to the provisions of Article
             4;

                 (vi) all downward  Purchase Price Adjustments for Title Defects
             and Environmental  Defects determined in accordance with Article 4;
             and

                 (vii) any other amount provided for in this Agreement or agreed
             upon in writing by Buyer and Seller.

             (c) The  allocations  of  costs  and  expenses  and/or  adjustments
         described  in Section  10.02(a)  and Section  10.02(b)  are referred to
         herein as the "Purchase Price Allocations and Adjustments."

                                       34



Section 10.03 Closing  Adjustments  and  Allocations  Statement.  Not later than
three (3) business  days prior to the Closing  Date,  Seller  shall  prepare and
deliver to Buyer a statement of the estimated  Purchase  Price  Allocations  and
Adjustments with appropriate support (the "Statement"), which Statement shall be
based upon the then most currently  available  data and  information in order to
make the adjustments as provided in Section 10.02.

Section 10.04 Post-Closing Allocations and Adjustments to Purchase Price.

             (a) On or before  120 days after the  Closing  Date,  Seller  shall
         prepare  and  deliver  to  Buyer a  revised  Statement  ("Final  ------
         Settlement   Statement")   setting  forth  the  actual  Purchase  Price
         Allocations  and  Adjustments.  Each Party shall provide the other such
         data and information as may be reasonably requested to permit Seller to
         prepare the Final Settlement Statement or to permit Buyer to perform or
         cause to be performed an audit of the Final Settlement  Statement.  The
         Final  Settlement  Statement  shall  become  final and binding upon the
         parties on the thirtieth (30th) day following  receipt thereof by Buyer
         (the "Final  Settlement Date") unless Buyer gives written notice of its
         disagreement (a "Notice of Disagreement") to Seller prior to such date.
         Any  Notice of  Disagreement  shall  specify in  reasonable  detail the
         dollar amount and the nature and basis of any disagreement so asserted.
         If a Notice of  Disagreement  is received by Seller in a timely manner,
         then the Parties shall  resolve the dispute  evidenced by the Notice of
         Disagreement  by mutual  agreement,  or  otherwise in  accordance  with
         Section 4.13.

             (b) If the amount of the  adjusted  Purchase  Price as set forth on
         the Final  Settlement  Statement  exceeds  the amount of the  estimated
         Purchase Price paid at the Closing, then Buyer shall pay in immediately
         available funds to Seller the amount by which the Purchase Price as set
         forth on the  Final  Settlement  Statement  exceeds  the  amount of the
         estimated  Purchase  Price paid at the Closing within five (5) business
         days after the Final  Settlement  Date.  If the amount of the  adjusted
         Purchase Price as set forth on the Final  Settlement  Statement is less
         than the amount of the  estimated  Purchase  Price paid at the Closing,
         then  Seller  shall  pay in  immediately  available  funds to Buyer the
         amount by which the Purchase Price as set forth on the Final Settlement
         Statement is less than the amount of the estimated  Purchase Price paid
         at the Closing within five (5) business days after the Final Settlement
         Date.

             (c)  Pursuant  to Section  10.02(b),  the  Purchase  Price is to be
         reduced by the value of  Hydrocarbons  produced  during the period from
         the  Effective  Time to the Closing  Date.  If Buyer shall  receive any
         revenues  attributable  to such  Hydrocarbons  for any reason for which
         Buyer has received a reduction in the Purchase  Price  pursuant to this
         Section  10.04(c),  Buyer  shall  promptly  remit  same in  immediately
         available  funds to Seller.  Likewise,  if Seller  shall for any reason
         receive any of the proceeds of sale of Hydrocarbons  produced and saved
         from the  Subject  Interests  and  attributable  to the period from and
         after  the  Closing  Date or any  other  revenues  attributable  to the
         ownership or operation of the Assets from and after the Effective Time,
         Seller shall  promptly  remit same in  immediately  available  funds to
         Buyer.

                                       35


             (d) Except as otherwise  provided in this Agreement,  any costs and
         expenses,  including  Taxes (other than income  taxes)  relating to the
         Assets which are not reflected in the Final Settlement  Statement shall
         be treated as follows:

                 (i) All costs  and  expenses  relating  to the  Assets  for the
             period  of time  prior  to the  Effective  Time  shall  be the sole
             obligation  of Seller and Seller shall  promptly pay, or if paid by
             Buyer,  promptly reimburse Buyer in immediately available funds for
             and indemnify, defend, and hold Buyer harmless from and against the
             same; and

                 (ii) All costs and  expenses  relating  to the Assets for which
             Buyer  is  responsible  (being  those  incurred  on  or  after  the
             Effective  Time)  shall be the sole  obligation  of Buyer and Buyer
             shall promptly pay, or if paid by Seller, promptly reimburse Seller
             in immediately  available funds for and indemnify,  defend and hold
             Seller harmless from and against the same.

             (e)  Purchase  Price  adjustments,  if any,  with  respect to Title
         Defects or  Environmental  Defects the cure or correction of which or a
         dispute  with  respect  to  the  same  remains  pending  on  the  Final
         Settlement Date shall be made on a date mutually agreed by the Parties,
         both acting reasonably.

Section 10.05 Transfer Taxes. All sales,  use,  documentary,  recording,  stamp,
transfer and other taxes (other than taxes on gross income,  net income or gross
receipts) and duties,  levies,  assessments,  fees or other governmental charges
incurred  by or  imposed  with  respect  to the  property  transfers  undertaken
pursuant to this Agreement shall be the responsibility of, and shall be paid by,
Buyer.  The  Parties  will  reasonably  cooperate  to  eliminate  or reduce  the
assessment of sales or use taxes to the extent  permitted by applicable  Law. If
Seller  (not  Buyer) is  required  by  applicable  Law to appeal or protest  the
assessment of sales or use taxes,  Seller shall protest the  assessment of those
taxes if Buyer requests  Seller in writing to make such appeal or protest,  and,
in such event, Buyer will reimburse Seller all out-of-pocket expenses authorized
by Buyer and incurred by Seller in connection with such appeal or protest.

Section  10.06  Ad  Valorem  and  Similar  Taxes.  All  ad  valorem,   property,
production,  severance and similar Taxes attributable to any period prior to the
Effective Time will be paid by the Seller. All ad valorem, property, production,
severance and similar Taxes attributable to any period on or after the Effective
Time shall be paid by Buyer.  Notwithstanding anything to the contrary set forth
in this  Agreement,  for all  purposes  of this  Agreement,  Taxes  based  on or
measured by  production  of  Hydrocarbons  or the value  thereof shall be deemed
attributable to the period during which such production  occurred  regardless of
the year when such Taxes are assessed.  Seller shall provide written evidence to
Buyer that it has paid all Taxes for periods  prior to the  Effective  Time that
are payable after the Effective  Time including ad valorem Taxes in the state of
Colorado and production  Taxes in the state of Wyoming  payable in 2009 provided
such Taxes are based on production occurring prior to the Effective Time.

                                       36


Section 10.07 Actions of Seller at the Closing. At the Closing, Seller shall:

             (a) execute, acknowledge and deliver to Buyer the Assignment in the
         form of Exhibit E,  effective as of the Effective  Time, and such other
         conveyances,   assignments,   transfers,   bills  of  sale  and   other
         instruments  (in form and substance  mutually  agreed upon by Buyer and
         Seller) as may be necessary or desirable to convey the Assets to Buyer;

             (b) execute,  acknowledge and deliver to Buyer such letters in lieu
         of transfer or division orders as may be reasonably  requested by Buyer
         no less than five (5) business days prior to the Closing Date directing
         all purchasers of production from the Subject Interests to make payment
         of proceeds attributable to such production to Buyer from and after the
         later  of the  Closing  Date  or the  date  operations  and  accounting
         functions are transferred to Buyer;

             (c)  deliver  to Buyer  possession  of the  Assets  (excluding  the
         Records);

             (d)  execute  and deliver to Buyer an  affidavit  attesting  to its
         non-foreign status;

             (e) execute and deliver the Seismic  License in form and  substance
         reasonably satisfactory to Buyer;

             (f) execute,  acknowledge and deliver any other agreements provided
         for herein or necessary or desirable  to  effectuate  the  transactions
         contemplated hereby; and

             (g) execute and deliver any  documents or  instruments  required by
         any Governmental Authority in order to transfer the operatorship of the
         Assets being operated by Seller to Buyer.

Section 10.08 Actions of Buyer at the Closing. At the Closing, Buyer shall:

             (a) pay the Purchase Price (as adjusted  pursuant to the provisions
         hereof)  in  immediately  available  funds  pursuant  to wire  transfer
         instructions to be provided by Seller to Buyer;

             (b) take possession of the Assets; and

             (c) execute,  acknowledge  and deliver the Assignment and any other
         agreements  provided for herein or necessary or desirable to effectuate
         the transactions contemplated hereby.

Section 10.09 Recordation; Further Assurances.

             (a) Promptly following the Closing, Buyer shall cause the documents
         identified in Section 9.04 and Section 10.07(a) to be recorded or filed
         in the appropriate real property and other applicable  records,  in the
         order reasonably  agreed upon by the Parties,  and Buyer shall promptly
         provide Seller copies of all such recorded or filed instruments.

                                       37


             (b)  Subject  to  such  additional   period  of  time  that  Seller
         reasonably  requires to use the  Records in the  conduct of  operations
         after Closing,  Seller shall make the Records available to be picked up
         by Buyer at the offices of Seller during normal  business  hours within
         thirty  (30) days after the  Closing,  to the extent the Records are in
         the   possession   of  Seller  and  are  not  subject  to   contractual
         restrictions  on  transferability.  Seller  shall have the right at its
         sole expense to make and retain copies of any of the Records.

             (c) After the Closing Date, each Party, at the request of the other
         Party and without additional consideration,  shall execute and deliver,
         or shall cause to be  executed  and  delivered,  from time to time such
         further  instruments  of  conveyance  and  transfer and shall take such
         other  action as the other Party may  reasonably  request to convey and
         deliver the Assets to Buyer and to accomplish  the orderly  transfer of
         the Assets to Buyer in the manner contemplated by this Agreement. After
         the Closing,  the Parties will cooperate to have all proceeds  received
         attributable to the Assets to be paid to the proper Party hereunder and
         to have all  expenditures to be made with respect to the Assets be made
         by the proper Party hereunder.

                                   ARTICLE 11

                                   TERMINATION

Section 11.01 Right of Termination. This Agreement may be terminated at any time
at or prior to the Closing:

             (a) by mutual written consent of the Parties;

             (b) by Seller on the Closing  Date if the  conditions  set forth in
         Article 8 have not been satisfied in all material  respects by Buyer or
         waived by Seller in writing by the Closing Date;

             (c) by Buyer on the  Closing  Date if the  conditions  set forth in
         Article 9 have not been satisfied in all material respects by ---------
         Seller or waived by Buyer in writing by the Closing Date;

             (d) by  either  Buyer or St.  Mary if the  Closing  shall  not have
         occurred by February 15, 2008;

             (e) by either Buyer or St. Mary if any Governmental Authority shall
         have  issued a final and  non-appealable  order,  judgment or decree or
         taken  any  other   final  and   non-appealable   action   challenging,
         restraining, enjoining, prohibiting or invalidating the consummation of
         any of the transactions contemplated herein;

             (f) by either Buyer or St. Mary if (i) the aggregate  amount of the
         Title Defect Values with respect to all Title Defects asserted by Buyer
         reasonably  and in good  faith  (net  of the  aggregate  amount  of the
         Purchase  Price  Adjustments  for all  Title  Benefits)  plus  (ii) the
         aggregate amount of the Environmental Defect Values with respect to all
         Environmental  Defects  asserted by Buyer  reasonably and in good faith

                                       38

         plus (iii) the aggregate  amount of all Casualty  Losses exceeds twenty
         percent (20%) of the unadjusted Purchase Price;



             (g) by  either  Buyer  or St.  Mary if  between  execution  of this
         Agreement and Closing,  an event should occur having a Material Adverse
         Effect on the ownership, operation or value of the Assets; or

             (h) as otherwise provided herein.

provided,  however,  that no Party  shall  have  the  right  to  terminate  this
Agreement  pursuant  to clause  (b),  (c), or (d) above if such Party is at such
time in Breach of any provision of this  Agreement,  or such Party  instigates a
proceeding of the nature described in Section 8.03 or Section 9.03.

Section  11.02  Effect of  Termination.  In the event that the Closing  does not
occur as a result of any Party  exercising  its right to  terminate  pursuant to
Section 11.01, then except as set forth in Section 2.02, this Agreement shall be
null and void and no Party shall have any further  rights or  obligations  under
this Agreement;  provided, that, nothing herein shall relieve any Party from any
liability for any Breach  hereof or any liability  that has accrued prior to the
date  of  such  termination,  which  liability,  and the  applicable  terms  and
provisions of this Agreement, shall survive such termination.

Section 11.03 Attorneys' Fees, Etc. If either Party to this Agreement resorts to
legal  proceedings  to enforce  this  Agreement,  the  prevailing  Party in such
proceedings  shall be  entitled  to recover  all costs  incurred  by such Party,
including  reasonable  attorneys' fees, in addition to any other relief to which
such Party may be entitled.

                                   ARTICLE 12

                         ASSUMPTION AND INDEMNIFICATION

Section 12.01 Buyer's Obligations after Closing. Upon and after Closing,  except
to the extent reflected in an upward Purchase Price Allocations and Adjustments,
Buyer will  assume  and  perform  all the  obligations,  liabilities  and duties
relating or with respect to the  ownership  and/or  operation of the Assets that
are  attributable to periods on or after the Effective  Time,  together with the
Plugging and Abandonment  Obligations,  the Environmental  Obligations,  and all
other  obligations  assumed by Buyer  under this  Agreement  (collectively,  the
"Assumed  Obligations").  Without limiting the generality of the foregoing,  the
Assumed Obligations shall also specifically include:

             (a)  Responsibility  for the performance of all express and implied
         obligations under the instruments described in Exhibit A, together with
         all other instruments in the chain of title to such Assets, the Leases,
         the  Contracts,  the  Surface  Agreements,  the  Permits  and all other
         orders,  contracts  and  agreements  to which the Assets  are  subject,
         including the payment of royalties and  overriding  royalties,  in each
         case  to  the  extent  attributable  to the  periods  on or  after  the
         Effective Time;

                                       39


             (b)  Responsibility  for  payment of all  amounts  held in suspense
         accounts by Seller as of the Closing  Date,  and for which the Purchase
         Price is  adjusted  pursuant  to Section  10.02(b),  without  regard to
         whether such  suspense  amounts  relate to periods  before or after the
         Effective  Time.  Seller  covenants and agrees to provide to Buyer with
         the Records,  the owner name, number and tax identification  number (if
         known by Seller),  the reason such amounts are in suspense,  the amount
         of  suspense  funds  for each  such  owner  making up the total of such
         funds,  and all other  information  with respect thereto required to be
         provided  to the  owner or to the  state  under  the  laws,  rules  and
         regulations of the affected  jurisdiction.  To the extent  practicable,
         Seller shall  provide such  information  in the  electronic or computer
         sensible form maintained by Seller. Seller shall remain responsible for
         the payment of any  statutory  interest  and  penalties  which may have
         accrued  prior to the  Effective  Time with  respect  to such  suspense
         amounts,  whether  payable to the interest owner or to any state agency
         in connection with unclaimed property laws, to the extent such interest
         and penalties are not included in the amount deducted from the Purchase
         Price pursuant to Section 10.02(b);

             (c) Responsibility for compliance with all Laws now or hereafter in
         effect pertaining to the Assets, and the procurement and maintenance of
         all permits, consents and authorizations of or required by Governmental
         Authorities in connection  with the Assets,  attributable to periods on
         or after the Effective Time; and

             (d)  Responsibility  for all obligations with respect to Production
         Imbalances  attributable to the Assets, whether attributable to periods
         before or after the Effective Time.

Section 12.02  Seller's  Obligations  after Closing.  After Closing,  each Party
comprising Seller will severally, and not jointly, retain responsibility for (a)
the payment of all operating  expenses and capital  expenditures  related to the
Assets and  attributable to Seller's  ownership  and/or  operation of the Assets
prior to the  Effective  Time,  but not including the AFEs set forth in Schedule
5.08, (b) severance,  ad valorem,  production,  property,  personal property and
similar Taxes  measured by the value of the Assets or measured by the production
of Hydrocarbons attributable to all periods from and after the effective date of
Seller's  ownership  of the  Assets  and prior to the  Effective  Time,  (c) the
payment of all broker's and finder's  fees in connection  with the  transactions
contemplated by this Agreement,  (d) the obligations,  liabilities and duties of
Seller relating or with respect to the ownership  and/or operation of the Assets
that are  attributable  to periods  prior to the  Effective  Time other than the
Plugging and Abandonment Obligations and the Environmental Obligations,  and (e)
Seller's  proportionate share of any third party Claims with respect to payments
of lease  royalties in respect of the Leases during Seller's period of ownership
of such Leases (collectively the "Retained Obligations").

Section 12.03 Plugging and Abandonment Obligations.

             (a) Buyer's Obligations.  Provided Closing occurs and to the extent
         not otherwise  addressed by the express  provisions of this  Agreement,
         Buyer  assumes full  responsibility  and  liability  for the  following
         plugging  and  abandonment  obligations  related  to  the  Assets  (the
         "Plugging and Abandonment Obligations"), regardless of whether they are


                                       40


         attributable  to the  ownership or  operation  of the Assets  before or
         after the Effective Time:

                 (i)  The  necessary  and  proper   plugging,   replugging   and
             abandonment  of  all  wells  on the  Assets,  whether  plugged  and
             abandoned  before or after the Effective  Time in  compliance  with
             applicable Laws and the terms of the Leases;

                 (ii)  The  necessary  and  proper   decommissioning,   removal,
             abandonment, and disposal of all structures, pipelines, facilities,
             equipment,  abandoned  Assets,  junk and  other  personal  property
             located on or comprising any part of the Assets in compliance  with
             applicable Laws and the terms of the Leases;

                 (iii) The  necessary  and  proper  capping  and  burying of all
             associated  flow  lines  located on or  comprising  any part of the
             Assets, to the extent required by applicable Laws, the Leases,  the
             Contracts, or other agreements;

                 (iv) The necessary and proper  restoration of the Assets,  both
             surface and subsurface, in compliance with any applicable Laws, the
             Leases,  the  Surface  Agreements,  the  Contracts,  or  any  other
             applicable agreements;

                 (v) To the extent not  addressed by operation of Article 4, any
             necessary   clean-up   or  disposal  of  any  part  of  the  Assets
             contaminated by NORM,  asbestos  containing  materials,  lead based
             paint  or  any  other  substances  or  materials  considered  to be
             hazardous  under  Laws,  including  Environmental  Laws,  and  Laws
             relating to the protection of natural resources;

                 (vi) All obligations arising from contractual  requirements and
             demands  made by  Governmental  Authorities  or parties  claiming a
             vested interest in any part of the Assets; and

                 (vii)  Obtaining  and  maintaining  all bonds  and  securities,
             including  supplemental  or additional  bonds or other  securities,
             that may be required by contract or by Governmental Authorities.

             (b) Standard of  Operations.  Buyer shall  conduct all Plugging and
         Abandonment  Obligations  and all other  operations with respect to the
         Assets in a good and  workmanlike  manner  and in  compliance  with all
         Laws,  including  Environmental  Laws and  Laws  (now or  hereafter  in
         effect) relating to the protection of natural resources.

Section 12.04  Environmental  Obligations.  Provided  Closing  occurs and to the
extent not  otherwise  addressed by the express  provisions  of this  Agreement,
Buyer assumes full  responsibility and liability for the following  occurrences,
events, conditions and activities on, or related to, or attributable to Seller's
ownership  or  operation  of  the  Assets  (the   "Environmental   Obligations")
regardless  of whether  arising from  Seller's  ownership  or  operation  of, or
relating to, the Assets before or after the Effective  Time,  and  regardless of
whether  resulting  from any acts or omissions of Seller or its  Representatives
(INCLUDING THOSE ARISING FROM THE SOLE, JOINT OR CONCURRENT  NEGLIGENCE (BUT NOT


                                       41


GROSS NEGLIGENCE OR WILLFUL  MISCONDUCT),  STRICT LIABILITY OR OTHER LEGAL FAULT
OF SELLER OR ANY OF SELLER'S  REPRESENTATIVES)  or the condition,  including the
environmental condition of the Assets when acquired:

             (a) Environmental  pollution or contamination,  including pollution
         or  contamination  of the  soil,  groundwater  or air by  Hydrocarbons,
         drilling  fluid and  other  chemicals,  brine,  produced  water,  NORM,
         asbestos containing  materials,  lead based paint, mercury or any other
         substance, and any other violation of Environmental Laws or Laws now or
         hereafter in effect relating to the protection of natural resources;

             (b) Underground injection activities and waste disposal;

             (c)  Clean-up  responses,  and the  cost of  remediation,  control,
         assessment  or  compliance  with  respect  to  surface  and  subsurface
         pollution caused by spills, pits, ponds, lagoons or storage tanks;

             (d)  Failure  to  comply   with   applicable   land  use,   surface
         disturbance, licensing or notification requirements;

             (e)  Disposal on the Assets of any  hazardous  substances,  wastes,
         materials  and  products  generated by or used in  connection  with the
         ownership,  development,  operation or  abandonment  of any part of the
         Assets; and

             (f)  Non-compliance  with  Environmental  Laws (now or hereafter in
         effect).

Section  12.05  Definition  of Claims.  Except as expressly  provided in Section
4.09(a)(ix) and Section 7.03(a) that specifically  operate to include Buyer, the
term "Claims" means any and all direct or indirect,  demands, claims, notices of
violation,   notices   of   probable   violation,    filings,    investigations,
administrative  proceedings,  actions,  causes of  action,  suits,  other  legal
proceedings,  judgments,  assessments,  damages, deficiencies, Taxes, penalties,
fines, obligations,  responsibilities,  liabilities,  payments, charges, losses,
costs,  and expenses  (including  costs and expenses of operating the Assets) of
any kind or character  asserted by a third party  (whether or not asserted prior
to Closing,  and  whether  known or unknown,  fixed or unfixed,  conditional  or
unconditional,  based on negligence,  strict  liability or otherwise,  choate or
inchoate,  liquidated or unliquidated,  secured or unsecured, accrued, absolute,
contingent,  or other legal  theory),  including  penalties  and interest on any
amount payable as a result of any of the foregoing, any legal or other costs and
expenses  incurred in connection with  investigating or defending any Claim, and
all amounts paid in settlement of Claims. Without limiting the generality of the
foregoing,  the term "Claims"  specifically  includes any and all Claims arising
from, attributable to or incurred in connection with any (a) breach of contract,
(b) loss or  damage  to  property,  injury  to or death of  persons,  and  other
tortuous injury and (c) violations of applicable  Laws,  including Laws relating
to the  protection  of  natural  resources,  Environmental  Laws (each as now or
hereafter  in effect)  and any other legal  right or duty  actionable  at law or
equity.

                                       42


Section 12.06 Application of Indemnities.

             (a) All  indemnities  set  forth in this  Agreement  extend  to the
         officers, directors, partners, managers, members, shareholders, agents,
         contractors,   employees  and  affiliates  of  the  indemnified   party
         ("Representatives").

             (b) UNLESS THIS AGREEMENT  EXPRESSLY PROVIDES TO THE CONTRARY,  THE
         INDEMNITY AND RELEASE,  AND WAIVER AND ASSUMPTION  PROVISIONS SET FORTH
         IN THIS AGREEMENT  APPLY,  REGARDLESS OF WHETHER THE INDEMNIFIED  PARTY
         (OR ITS  REPRESENTATIVES)  CAUSES,  IN WHOLE OR  PART,  AN  INDEMNIFIED
         CLAIM,  INCLUDING  INDEMNIFIED  CLAIMS ARISING OUT OF OR RESULTING,  IN
         WHOLE OR IN PART,  FROM, OUT OF OR IN CONNECTION  WITH THE CONDITION OF
         THE  ASSETS OR THE  SOLE,  JOINT,  OR  CONCURRENT  NEGLIGENCE  (BUT NOT
         SECURITIES  FRAUD  CLAIMS THAT  REQUIRE  SCIENTER OR  KNOWLEDGE  AS ONE
         ELEMENT OF THE CAUSE OF ACTION, GROSS NEGLIGENCE, WILLFUL MISCONDUCT OR
         FRAUD BY THE INDEMNIFIED PARTY),  STRICT LIABILITY OR OTHER LEGAL FAULT
         OF THE INDEMNIFIED PARTY OR ANY OF ITS REPRESENTATIVES.

             (c) NEITHER  BUYER NOR SELLER SHALL BE ENTITLED TO RECOVER FROM THE
         OTHER PARTY, RESPECTIVELY, AND EACH PARTY RELEASES THE OTHER PARTY FROM
         AND WAIVES, ANY LOSSES, COSTS,  EXPENSES, OR DAMAGES ARISING UNDER THIS
         AGREEMENT OR IN  CONNECTION  WITH OR WITH  RESPECT TO THE  TRANSACTIONS
         CONTEMPLATED  IN THIS  AGREEMENT  ANY  AMOUNT IN  EXCESS OF THE  ACTUAL
         COMPENSATORY  DAMAGES SUFFERED BY SUCH PARTY EXCEPT THAT IF THE DISPUTE
         BETWEEN  SELLER  AND  BUYER IS BASED ON A  FAILURE  OF THE  TRANSACTION
         CONTEMPLATED  HEREBY TO CLOSE, THE SOLE AND EXCLUSIVE REMEDIES SHALL BE
         THOSE PROVIDED FOR IN SECTION 2.02. BUYER AND SELLER WAIVE, AND RELEASE
         EACH OTHER FROM ANY RIGHT TO RECOVER PUNITIVE,  SPECIAL,  EXEMPLARY AND
         CONSEQUENTIAL DAMAGES ARISING IN CONNECTION WITH OR WITH RESPECT TO THE
         TRANSACTIONS  CONTEMPLATED IN THIS AGREEMENT;  PROVIDED,  HOWEVER,  ANY
         SUCH  DAMAGES  RECOVERED  BY A THIRD PARTY  (OTHER  THAN  SUBSIDIARIES,
         AFFILIATES  OR  PARENTS  OF A PARTY)  FOR WHICH A PARTY  OWES THE OTHER
         PARTY AN INDEMNITY UNDER THIS AGREEMENT SHALL NOT BE WAIVED.  BUYER AND
         SELLER ACKNOWLEDGE THAT THIS STATEMENT IS CONSPICUOUS.

             (d) The indemnities of the indemnifying  Party in this Agreement do
         not cover or include any amounts that the indemnified party may legally
         recoup from other third party owners under  applicable  joint operating
         agreements or other agreements,  and for which the indemnified party is
         reimbursed  by any third  party.  The  indemnifying  Party will pay all
         costs incurred by the indemnified party in obtaining reimbursement from


                                       43


         third  parties.  There will be no upward or downward  adjustment in the
         Purchase  Price as a result of any matter for which  Buyer or Seller is
         indemnified under this Agreement.

Section 12.07 Buyer's Indemnity.  Buyer shall release and indemnify,  defend and
hold Seller and its Representatives harmless from and against any and all Claims
caused by,  resulting  from or  incidental to the Assumed  Obligations,  and any
Claims caused by,  resulting from or  attributable  to (a) any inaccuracy of any
representation  or  warranty  of Buyer set forth in this  Agreement,  or (b) any
Breach of, or failure to perform or satisfy any of the covenants and obligations
of Buyer hereunder.

Section 12.08 Seller's Indemnity. Subject to Section 12.10, Seller shall release
and indemnify,  defend and hold Buyer and its Representatives  harmless from and
against  any and all  Claims  caused by,  resulting  from or  incidental  to the
Retained Obligations, and any Claims caused by or resulting from or attributable
to (a) the  Breach of any  representation  or  warranty  of Seller  set forth in
Section 5.04 of this Agreement,  and (b) any Breach of, or failure to perform or
satisfy, any of the covenants and obligations of Seller hereunder.

Section  12.09  Notices  and  Defense of  Indemnified  Claims.  Each Party shall
immediately  notify the other  Party of any Claim of which it becomes  aware and
for which it is  entitled  to  indemnification  from the other  Party under this
Agreement.  The  indemnifying  Party  shall  be  obligated  to  defend,  at  the
indemnifying  Party's sole expense,  any litigation or other  administrative  or
adversarial  proceeding  against the indemnified Party relating to any Claim for
which the  indemnifying  Party has agreed to release and  indemnify and hold the
indemnified  Party harmless under this Agreement;  provided,  however,  that the
failure to give such notice  shall not relieve the  indemnifying  Party from its
obligations  unless  such  failure  to  give  notice  actually   prejudices  the
indemnifying  Party and so long as the  notice is given  within  the  period set
forth  in  Section  12.10.  The  indemnified  Party  shall  have  the  right  to
participate with the indemnifying  Party in the defense of any such Claim at its
own expense.

Section 12.10  Survival.  Except as  specifically  provided in Section 12.07 and
Section 12.08, the representations,  warranties, covenants and agreements of the
Parties set forth herein shall not survive the Closing,  and the consummation of
the transactions  contemplated hereby, and Buyer and Seller each covenant not to
sue the other  based  upon any  alleged  Breach of any such  representations  or
warranties that do not survive the Closing.  The indemnity of Seller as provided
in Section  12.08 shall  survive  only for a period of  twenty-four  (24) months
after the Closing.  Notwithstanding anything to the contrary, Buyer shall not be
entitled to make, and hereby waives the right to assert, any claim for indemnity
pursuant to the  provisions of this Article 12 against Seller unless Buyer seeks
indemnification  for such  claim by a written  notice  received  by Seller on or
before the date that is  twenty-four  (24) months  after the  Closing  Date (the
"Expiration Date"). Anything in this Agreement to the contrary  notwithstanding,
after the Expiration  Date, all of the Retained  Liabilities and all of Seller's
other  liabilities  and  obligations  with respect to the Assets (and all Claims
with respect thereto) shall be deemed and constitute Assumed  Obligations except
to the  extent of any  Claims of which  Buyer  notifies  Seller on or before the
Expiration Date in accordance with this Agreement.

Section 12.11 Exclusive Remedy.  The terms and provisions of this Article 12 and
those provided in Article 2, Article 4, Article 7, Article 8, Article 9, Article
10, and Article 11 shall be the sole and exclusive remedy of each of the Parties


                                       44


indemnified hereunder with respect to the representations, warranties, covenants
and  agreements  of the  Parties  set  forth  in this  Agreement  and the  other
documents executed and delivered hereunder; provided, however, that the terms of
this  Section  12.11  shall not be  applicable  to the  extent  that a Party has
committed  fraud,  securities  fraud  (where one of the elements of the cause of
action is scienter or knowledge), willful misconduct, or gross negligence.

Section 12.12 Defenses and Counterclaims.  Each Party that is required to assume
any  obligation  or liability of the other Party  pursuant to this  Agreement or
that is  required  to release  and  defend,  indemnify  or hold the other  Party
harmless  hereunder  shall,  notwithstanding  any other provision  hereof to the
contrary,  be  entitled  to the use  and  benefit  of all  defenses  (legal  and
equitable)  and  counterclaims  of such other  Party in  defense of third  party
Claims arising out of any such assumption or indemnification.

Section 12.13 Anti-Indemnity  Statute.  Buyer and Seller agree that with respect
to any statutory  limitations now or hereafter in effect  affecting the validity
or  enforceability  of the  indemnities  provided  for in this  Agreement,  such
indemnities  shall be deemed  amended in order to comply with such  limitations.
This provision concerning  statutory  limitations shall not apply to indemnities
for all liabilities of the indemnifying  Party which are covered by such Party's
insurance.

                                   ARTICLE 13

                   DISCLAIMERS; CASUALTY LOSS AND CONDEMNATION

Section  13.01  Disclaimers  of  Representations  and  Warranties.  The  express
representations  and  warranties  of  Seller  contained  in this  Agreement  are
exclusive and are in lieu of all other representations and warranties,  express,
implied,  at common law or  statutory.  BUYER  ACKNOWLEDGES  THAT SELLER HAS NOT
MADE,  AND SELLER  HEREBY  EXPRESSLY  DISCLAIMS  AND  NEGATES,  AND BUYER HEREBY
EXPRESSLY WAIVES, ANY REPRESENTATION OR WARRANTY,  EXPRESS,  IMPLIED,  AT COMMON
LAW, BY STATUTE OR OTHERWISE,  RELATING TO (a)  PRODUCTION  RATES,  RECOMPLETION
OPPORTUNITIES, DECLINE RATES, INFORMATION IN RESPECT OF PRODUCTION IMBALANCES OR
THE  QUALITY,  QUANTITY  OR  VOLUME OF THE  RESERVES  OF  HYDROCARBONS,  IF ANY,
ATTRIBUTABLE  TO THE ASSETS,  (b) THE ACCURACY,  COMPLETENESS  OR MATERIALITY OR
SIGNIFICANCE  OF  ANY  INFORMATION,   DATA,   GEOLOGICAL  AND  GEOPHYSICAL  DATA
(INCLUDING ANY  INTERPRETATIONS OR DERIVATIVES BASED THEREON) OR OTHER MATERIALS
(WRITTEN OR ORAL) CONSTITUTING PART OF THE ASSETS,  NOW, HERETOFORE OR HEREAFTER
FURNISHED TO BUYER BY OR ON BEHALF OF SELLER, (c) THE CONDITION,  INCLUDING, THE
ENVIRONMENTAL  CONDITION OF THE ASSETS AND (d) THE  COMPLIANCE  OF SELLER'S PAST
PRACTICES WITH THE TERMS AND  PROVISIONS OF ANY AGREEMENT  IDENTIFIED IN EXHIBIT
A, OR ANY SURFACE  AGREEMENT,  PERMIT OR CONTRACT OR APPLICABLE LAWS,  INCLUDING
ENVIRONMENTAL  LAWS AND LAWS RELATING TO THE  PROTECTION  OF NATURAL  RESOURCES,
EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN ARTICLE 5. NOTWITHSTANDING ANYTHING TO


                                       45


THE CONTRARY IN THIS  AGREEMENT,  SELLER  EXPRESSLY  DISCLAIMS AND NEGATES,  AND
BUYER HEREBY WAIVES, AS TO PERSONAL PROPERTY, EQUIPMENT,  INVENTORY,  MACHINERY,
FIXTURES,  BUILDINGS, OFFICES, TRAILERS, ROLLING STOCK, VEHICLES, AND GEOLOGICAL
AND  GEOPHYSICAL  DATA  (INCLUDING  ANY  INTERPRETATIONS  OR  DERIVATIVES  BASED
THEREON)  CONSTITUTING A PART OF THE ASSETS (i) ANY IMPLIED OR EXPRESS  WARRANTY
OF  MERCHANTABILITY,  (ii) ANY  IMPLIED OR  EXPRESS  WARRANTY  OF FITNESS  FOR A
PARTICULAR  PURPOSE,  (iii) ANY  IMPLIED OR EXPRESS  WARRANTY OF  CONFORMITY  TO
MODELS OR SAMPLES OF  MATERIALS,  (iv) ANY IMPLIED OR EXPRESS  WARRANTY THAT ANY
DATA TRANSFERRED PURSUANT HERETO IS NONINFRINGING,  (v) ANY RIGHTS OF PURCHASERS
UNDER APPROPRIATE STATUTES TO CLAIM DIMINUTION OF CONSIDERATION OR RETURN OF THE
PURCHASE  PRICE,  (vi) ANY IMPLIED OR EXPRESS  WARRANTY OF FREEDOM FROM DEFECTS,
WHETHER KNOWN OR UNKNOWN,  (vii) ANY AND ALL IMPLIED  WARRANTIES  EXISTING UNDER
APPLICABLE  LAWS,  AND  (viii)  ANY  IMPLIED  OR  EXPRESS   WARRANTY   REGARDING
ENVIRONMENTAL  LAWS,  OR LAWS  RELATING TO THE  PROTECTION  OF THE  ENVIRONMENT,
HEALTH, SAFETY OR NATURAL RESOURCES OR RELATING TO THE RELEASE OF MATERIALS INTO
THE ENVIRONMENT,  INCLUDING ASBESTOS  CONTAINING  MATERIAL,  LEAD BASED PAINT OR
MERCURY  AND ANY OTHER  HAZARDOUS  SUBSTANCES  OR WASTES,  IT BEING THE  EXPRESS
INTENTION OF BUYER AND SELLER THAT THE ASSETS,  INCLUDING ALL PERSONAL PROPERTY,
EQUIPMENT,  FACILITIES,  INVENTORY,  MACHINERY,  FIXTURES,  BUILDINGS,  OFFICES,
TRAILERS,  VEHICLES AND ROLLING STOCK INCLUDED IN THE ASSETS,  SHALL BE CONVEYED
TO BUYER,  AND BUYER SHALL ACCEPT THE SAME, AS IS, WHERE IS, WITH ALL FAULTS AND
IN THEIR PRESENT CONDITION AND STATE OF REPAIR. BUYER REPRESENTS AND WARRANTS TO
SELLER THAT BUYER WILL MAKE, OR CAUSE TO BE MADE SUCH  INSPECTIONS  WITH RESPECT
TO SUCH ASSETS AS BUYER DEEMS  APPROPRIATE.  SELLER AND BUYER AGREE THAT, TO THE
EXTENT  REQUIRED  BY  APPLICABLE  LAWS  (INCLUDING  ENVIRONMENTAL  LAWS AND LAWS
RELATING  TO  THE  PROTECTION  OF  NATURAL  RESOURCES,  HEALTH,  SAFETY  OR  THE
ENVIRONMENT)  TO BE EFFECTIVE,  THE  DISCLAIMERS OF THE WARRANTIES  CONTAINED IN
THIS SECTION ARE "CONSPICUOUS" DISCLAIMERS FOR ALL PURPOSES.

Section 13.02 NORM.  BUYER  ACKNOWLEDGES  THAT IT HAS BEEN INFORMED THAT OIL AND
GAS PRODUCING  FORMATIONS CAN CONTAIN NATURALLY OCCURRING  RADIOACTIVE  MATERIAL
("NORM").  SCALE FORMATION OR SLUDGE DEPOSITS CAN CONCENTRATE LOW LEVELS OF NORM
ON EQUIPMENT AND OTHER  ASSETS.  THE ASSETS  SUBJECT TO THIS  AGREEMENT MAY HAVE
LEVELS  OF NORM  ABOVE  BACKGROUND  LEVELS,  AND A HEALTH  HAZARD  MAY  EXIST IN
CONNECTION WITH THE ASSETS BY REASON THEREOF.  THEREFORE,  BUYER MAY NEED TO AND
SHALL FOLLOW SAFETY PROCEDURES WHEN HANDLING THE EQUIPMENT AND OTHER ASSETS.

                                       46


Section 13.03 Casualty Loss; Condemnation.

             (a) Except as  otherwise  provided in this  Agreement,  Buyer shall
         assume  all  risk of loss  with  respect  to,  and  any  change  in the
         condition of, the Assets from and after the Effective  Time,  including
         with respect to the depletion of Hydrocarbons,  the watering-out of any
         well,  the  collapse of casing,  sand  infiltration  of wells,  and the
         depreciation of personal property.

             (b) Prior to the  Closing,  there  shall  not have been a  material
         adverse  change in the  Assets  taken as a whole  caused by an event of
         casualty  (a  "Casualty"),  including  but  not  limited  to,  volcanic
         eruptions, acts of God, fire, explosion, earthquake, wind storm, flood,
         drought,  condemnation,  the  exercise of any right of eminent  domain,
         confiscation, seizure, but excepting depletion due to normal production
         and depreciation or failure of equipment or casing.

             (c) If,  prior to the  Closing,  a Casualty  occurs (or  Casualties
         occur)  which  results  in a  reduction  in the value of the  Assets in
         excess  of  fifteen  percent  (15%) of the  Purchase  Price  ("Casualty
         Loss"), Buyer or Seller may elect to terminate this Agreement.  If this
         Agreement is not so  terminated,  then this  Agreement  shall remain in
         full force and effect  notwithstanding  any such Casualty Loss, and, at
         Buyer's sole option, (i) Seller shall retain such Asset subject to such
         Casualty  and such Asset shall be the subject of an  adjustment  to the
         Purchase Price in the same manner set forth in Section 4.03 hereof,  or
         (ii) at the Closing,  Seller shall pay to Buyer all sums paid to Seller
         by reason of such Casualty Loss, provided,  however,  that the Purchase
         Price shall not be adjusted by reason of such payment, and Seller shall
         assign,  transfer  and set over unto Buyer all of the right,  title and
         interest of Seller in and to such Asset and any unpaid  awards or other
         payments arising out of such Casualty Loss.

             (d) For purpose of  determining  the value of a Casualty  Loss, the
         Parties shall use the same  methodology as applied in  determining  the
         value of a Title Defect as set forth in Section 4.03(a).

                                   ARTICLE 14

                                  MISCELLANEOUS

Section 14.01 Names. As soon as reasonably possible after the Closing, but in no
event  later than 45 days after the  Closing,  Buyer  shall  remove the names of
Seller and its affiliates,  and all variations  thereof,  from all of the Assets
and make the requisite  filings with, and provide the requisite  notices to, the
appropriate  Governmental  Authorities  to place the title or other  indicia  or
responsibility of ownership,  including operation of the Assets, in a name other
than the name of the Seller or any of its affiliates, or any variations thereof.

Section 14.02 Expenses. Each Party shall be solely responsible for all expenses,
including  due  diligence  expenses,  incurred  by it in  connection  with  this
transaction,  and neither Party shall be entitled to any  reimbursement  for any
such expenses from the other Party.

                                       47


Section  14.03  Document  Retention.  As used in this  Section  14.03,  the term
"Documents"  shall  mean all files,  documents,  books,  records  and other data
delivered to Buyer by Seller pursuant to the provisions of this Agreement (other
than those that Seller has retained either the original or a copy of), including
financial and tax  accounting  records;  land,  title and division  order files;
contracts;  engineering  and well files;  and books and  records  related to the
operation  of the Assets  prior to the  Closing  Date.  Buyer  shall  retain and
preserve the  Documents  for a period of no less than seven (7) years  following
the Closing  Date (or for such  longer  period as may be required by Laws of any
Governmental  Authority),  and  shall  allow  Seller or its  representatives  to
inspect the  Documents at  reasonable  times and upon  reasonable  notice during
regular  business  hours  during such time  period.  Seller shall have the right
during such period to make copies of any of the Documents at its expense.

Section 14.04 Entire Agreement. This Agreement, the documents to be executed and
delivered hereunder, and the Exhibits,  Schedules and Appendices attached hereto
constitute the entire  agreement  between the Parties  pertaining to the subject
matter hereof and supersede all prior agreements,  understandings,  negotiations
and  discussions,  whether  oral or written,  of the Parties  pertaining  to the
subject matter hereof; provided, however, that this Agreement does not supersede
that certain  Confidentiality  Agreement  dated October 15, 2007, by and between
the St.  Mary and Buyer,  which  agreement  shall not survive  the  Closing.  No
supplement,  amendment,  alteration,  modification  or waiver of this  Agreement
shall  be  binding  unless  executed  in  writing  by  each of the  Parties  and
specifically referencing this Agreement.

Section 14.05  Waiver.  No waiver of any  provision of this  Agreement  shall be
deemed or shall  constitute a waiver of any other  provision  hereof (whether or
not  similar),  nor shall such waiver  constitute  a  continuing  waiver  unless
otherwise expressly provided.

Section 14.06  Construction.  The captions in this Agreement are for convenience
only and  shall  not be  considered  a part of or  affect  the  construction  or
interpretation of any provision of this Agreement.

Section  14.07 No Third  Party  Beneficiaries.  Except as  provided  in  Section
12.06(a), nothing in this Agreement shall provide any benefit to any third party
or entitle any third party to any claim, cause of action, remedy or right of any
kind, it being the intent of the Parties that this Agreement shall otherwise not
be construed as a third party beneficiary contract.

Section 14.08 Assignment.  Except as provided in Section 2.04, neither Party may
assign or delegate any of its rights or duties  hereunder to any  individual  or
entity other than an affiliate of such Party without the prior  written  consent
of the other Party and any  assignment  made without such consent shall be void.
Except as otherwise  provided  herein,  this Agreement shall be binding upon and
inure to the benefit of the Parties and their respective  permitted  successors,
assigns  and  legal  representatives.   Notwithstanding  any  assignment  to  an
affiliate,  Buyer shall nevertheless  remain liable to Seller in accordance with
the terms of this Agreement.

Section  14.09  Governing  Law;  Venue.  This  Agreement,  the  other  documents
delivered  pursuant hereto, and the legal relations between the Parties shall be
governed and construed in accordance with the laws of the State of Colorado. Any
litigation  arising out of this  Agreement  shall be brought  before the Federal
courts  sitting  in the City and  County of Denver,  Colorado,  and the  Parties


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irrevocably waive any right to choose or request any other venue.

Section 14.10 Notices. Any notice, communication,  request, instruction or other
document required or permitted hereunder (including notices of Title Defects and
Environmental Defects) shall be given in writing and delivered in person or sent
by U.S. Mail postage  prepaid,  return  receipt  requested,  overnight  delivery
service,  electronically,  or facsimile to the addresses of Seller and Buyer set
forth  below.  Any such notice  shall be  effective  and deemed  given only upon
receipt.

                 Seller:               ST. MARY LAND & EXPLORATION COMPANY
                                       1776 Lincoln Street, Suite 770
                                       Denver, CO 80203
                                       Attention:  Jerry Hertzler
                                       Fax No.:  303-861-0934
                                       Tel. No.:  303-863-4348
                                       Email: jhertzler@stmaryland.com
                                              ------------------------

                      With copy to:    ST. MARY LAND & EXPLORATION COMPANY
                                       1776 Lincoln Street, Suite 770
                                       Denver, CO 80203
                                       Attention:  Milam Randolph Pharo
                                       Fax No.:  303-861-0934
                                       Tel. No.:  303-863-4313
                                       Email: rpharo@stmaryland.com
                                              ---------------------

                 Buyer:                ABRAXAS OPERATING, LLC
                                       500 North Loop 1604 East
                                       Suite 100
                                       San Antonio, TX 78232
                                       Attention:  Barbara M. Stuckey
                                       Fax No.:  210-490-8816
                                       Tel. No.:  210-490-4788
                                       Email: bstuckey@abraxaspetroleum.com
                                              -----------------------------

                      With copy to:    JACKSON WALKER L.L.P.
                                       112 East Pecan Street
                                       Suite 2400
                                       San Antonio, TX 78205
                                       Attention:  Steven R. Jacobs
                                       Fax No.:  210-978-7790
                                       Tel. No.:  210-978-7727
                                       Email: sjacobs@jw.com
                                              --------------

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Either Party may, by written notice so delivered to the other Party,  change its
address for notice purposes hereunder.

Section 14.11 Severability.  If any term or other provision of this Agreement is
invalid,  illegal or  incapable  of being  enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect and the Parties shall negotiate in good faith to
modify  this  Agreement  so as to effect  their  original  intent as  closely as
possible in an acceptable  manner to the end that the transactions  contemplated
hereby are fulfilled to the extent possible.

Section 14.12 Interpretation.  This Agreement shall be deemed and considered for
all  purposes to have been  jointly  prepared by the  Parties,  and shall not be
construed against any one Party (nor shall any inference or presumption be made)
on the basis of who drafted this Agreement or any particular  provision  hereof,
who  supplied  the form of  Agreement,  or any other  event of the  negotiation,
drafting or execution of this  Agreement.  Each Party agrees that this Agreement
has been  purposefully  drawn and correctly  reflects its  understanding  of the
transaction  that it contemplates.  In construing this Agreement,  the following
principles will apply:

             (a)  A  defined  term  has  its  defined  meaning  throughout  this
         Agreement and each Exhibit and Schedule to this  Agreement,  regardless
         of whether it appears before or after the place where it is defined.

             (b)  If  there  is  any  conflict  or  inconsistency   between  the
         provisions of the main body of this Agreement and the provisions of any
         Exhibit or Schedule hereto, the provisions of this Agreement shall take
         precedence.  If there is any  conflict  between the  provisions  of any
         Assignment or other transaction documents attached to this Agreement as
         an Exhibit and the provisions of any  Assignment and other  transaction
         documents  actually  executed by the  parties,  the  provisions  of the
         executed Assignment and other executed transaction documents shall take
         precedence.

             (c)   Schedules   and  Exhibits   referred  to  herein  are  hereby
         incorporated and made a part of this Agreement for all purposes by such
         reference.

             (d) The omission of certain  provisions of this  Agreement from the
         Assignment does not constitute a conflict or inconsistency between this
         Agreement  and the  Assignment,  and  will not  effect a merger  of the
         omitted  provisions.  To the  fullest  extent  permitted  by Laws,  all
         provisions of this  Agreement are hereby deemed  incorporated  into the
         Assignment by reference.

             (e) The words  "includes"  and  "including"  and their  derivatives
         means  "includes,  but not limited to" or  "including,  but not limited
         to," and corresponding derivative meanings.

             (f) The Article,  Section, Exhibit and Schedules references in this
         Agreement  refer to the Articles,  Sections,  Exhibits and Schedules of
         this  Agreement.  The  headings  and titles in this  Agreement  are for
         convenience  only and shall have no  significance  in  interpreting  or
         otherwise affect the meaning of this Agreement.

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             (g)  The  terms   "knowledge"  or   "knowingly,"   whether  or  not
         capitalized,  shall mean the actual  knowledge  of a Party's  employees
         who, as of Closing are in a supervisory  capacity  responsible  for the
         ownership and operation of the Assets and any material  facts  relating
         thereto, after a due and diligent inquiry.

             (h) The adjective,  "material",  whether or not capitalized,  shall
         mean a situation, circumstance,  consequence or concept whose relevance
         to the  transactions  contemplated  by this  Agreement as a whole is of
         significance,  and would  not be  considered  a small or  insignificant
         deviation from the terms of this Agreement.

             (i) The term  "Material  Adverse  Effect"  shall  mean any  defect,
         condition,  change  or effect  (other  than  with  respect  to which an
         adjustment  to the  Purchase  Price  has been  made)  that  when  taken
         together with all other such defects,  conditions,  changes and effects
         significantly  diminishes the value, use,  operations or development of
         the  Assets,  taken  as a whole.  Notwithstanding  the  foregoing,  the
         following  shall not be  considered in  determining  whether a Material
         Adverse Effect has occurred:

                 (i) Fluctuations in commodity prices;

                 (ii) Changes in Laws or Environmental Laws; or

                 (iii)  Changes in the oil and gas  industry  that do not have a
             disproportionate  impact  on the  ownership  and  operation  of the
             Assets.

             (j) "Breach" shall mean any breach of, or any falsity or inaccuracy
         in,  any  representation  or  warranty  or any breach of, or failure to
         perform or comply  with,  any  covenant  or  obligation,  in or of this
         Agreement or any other contract,  agreement or instrument  contemplated
         by this  Agreement  or any event  which with the passing of time or the
         giving or notice, of both, would constitute such a breach,  inaccuracy,
         or  failure;  provided  that  to  constitute  a  Breach,  such  breach,
         inaccuracy, or failure must be material to the subject matter regarding
         which the Breach is asserted.

             (k) "Tax" means all taxes and any other assessments,  duties, fees,
         levies or other charges imposed by a Governmental Authority based on or
         measured by the value of the Assets  ,the  production  of  Hydrocarbons
         ,the receipt of proceeds with respect to such Assets or Hydrocarbons or
         otherwise  related in any manner or  attributable  to the Assets or the
         production of  Hydrocarbons  including  any  production  tax,  windfall
         profits tax, severance tax, personal property tax, real property tax or
         ad valorem tax, together with any interest, fine or penalty thereon, or
         addition thereto.

             (l) The plural  shall be deemed to include the  singular,  and vice
         versa.

Section 14.13 Time of the Essence.  Time shall be of the essence with respect to
all time periods and notice periods set forth in this Agreement.

Section  14.14  Counterpart  Execution.  This  Agreement  may be executed in any
number of  counterparts,  and each  counterpart  hereof shall be effective as to
each Party that executes the same whether or not all of such parties execute the


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same counterpart.  If counterparts of this Agreement are executed, the signature
pages from various  counterparts  may be combined into one composite  instrument
for all purposes. All counterparts together shall constitute only one Agreement,
but each  counterpart  shall be considered  an original.  In the event that this
Agreement  is delivered by  facsimile  transmission  or by e-mail  delivery of a
".pdf"  format  date  file,  such  signature  shall  create a valid and  binding
obligation  of the  party  executing  (or on  whose  behalf  such  signature  is
executed)  with the  same  force  and  effect  as if such  facsimile  or  ".pdf"
signature page were an original thereof.

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