Document:

<PAGE>

                                                                   EXHIBIT 10.11

                             PURE RESOURCES, INC.

                      7 1/8% SERIES A NOTE DUE 2011

                               CUSIP 74622E AA 0

                      No. 1

     Pure Resources, Inc., a Delaware corporation (the "Company"), for value
received promises to pay to Cede & Co. or registered assigns, the principal sum
of $350,000,000 on June 15, 2011 or such greater or lesser amount as is
indicated on the Schedule of Exchanges of Securities on the other side of this
Security.

     Interest Payment Dates:               June 15 and December 15

     Record Dates:                         May 31 and November 30

     Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.  Capitalized terms used
herein and not otherwise defined shall have the meanings ascribed to them in the
Indenture.

     IN WITNESS WHEREOF, the Company has caused this Security to be signed
manually or by facsimile by its duly authorized officer.

Dated:         June 8, 2001                PURE RESOURCES, INC.

                                           By: /s/ Jack Hightower
                                              ------------------------
                                              Jack D. Hightower
                                              Chairman, President and
                                              Chief Executive Officer
Certificate of Authentication:

FIRST UNION NATIONAL BANK,
as Trustee, certifies that this is one of the Securities
referred to in the within-mentioned Indenture.

By: /s/ R. Douglas Milner
    ---------------------------
    Authorized Signature
<PAGE>

     UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN
DEFINITIVE FORM, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE
DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO
THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY
SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR
DEPOSITARY.  THE DEPOSITORY TRUST COMPANY SHALL ACT AS THE DEPOSITARY UNTIL A
SUCCESSOR SHALL BE APPOINTED BY THE COMPANY AND THE REGISTRAR.  UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE ISSUER OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     THIS SECURITY (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION
EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933 (The
"SECURITIES ACT"), AND THIS SECURITY MAY NOT BE OFFERED, SOLD OR OTHERWISE
TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION
THEREFROM.  EACH PURCHASER OF THIS SECURITY IS HEREBY NOTIFIED THAT THE SELLER
OF THIS SECURITY MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION
5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.

     THE HOLDER OF THIS SECURITY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
THIS SECURITY MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I)
INSIDE THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A
QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT)
IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (II) OUTSIDE THE UNITED
STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE
SECURITIES ACT, (III) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE
SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE) OR (IV) PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF
CASES (I) THROUGH (IV) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY
STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER
IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS SECURITY FROM IT OF THE RESALE
RESTRICTIONS REFERRED TO IN (A) ABOVE.

                                       2
<PAGE>

                             [REVERSE OF SECURITY]

                             PURE RESOURCES, INC.

                      7 1/8% SERIES A NOTE DUE 2011

     This Security is one of a duly authorized issue of 7 1/8% Series A
Notes due June 15, 2011 (the "Securities") of Pure Resources, Inc., a Delaware
corporation (the "Company").

     1.  Interest.  The Company promises to pay interest on the principal amount
of this Security at 7 1/8% per annum from June 8, 2001 until maturity. The
Company will pay interest semiannually on June 15 and December 15 of each year
(each an "Interest Payment Date"), or if any such day is not a Business Day, on
the next succeeding Business Day. Interest on the Securities will accrue from
the most recent Interest Payment Date on which interest has been paid or, if no
interest has been paid, from June 8, 2001; provided that if there is no existing
Default in the payment of interest, and if this Security is authenticated
between a record date referred to on the face hereof and the next succeeding
Interest Payment Date, interest shall accrue from such next succeeding Interest
Payment Date; provided, further, that the first Interest Payment Date shall be
December 15, 2001. The Company also promises to pay any additional interest
required by Section 6 of the Registration Rights Agreement (as defined in
paragraph 17 below), upon the conditions, at the rates and for the periods
specified therein. Further, the Company shall pay interest on overdue principal
and premium, if any, from time to time on demand at a rate equal to the interest
rate then in effect; it shall pay interest on overdue installments of interest
(without regard to any applicable grace periods) from time to time on demand at
the same rate to the extent lawful. Interest will be computed on the basis of a
360-day year of twelve 30-day months.

     2.  Method of Payment.  The Company will pay interest on the Securities
(except defaulted interest) to the Persons who are registered Holders of
Securities at the close of business on the record date next preceding the
Interest Payment Date, even if such Securities are canceled after such record
date and on or before such Interest Payment Date.  The Holder must surrender
this Security to a Paying Agent to collect principal and premium, if any,
payments.  The Company will pay the principal of, and premium, if any, and
interest on the Securities in money of the United States of America that at the
time of payment is legal tender for payment of public and private debts.
Payments to Holders of principal, premium, if any, and interest shall be paid by
wire transfer of immediately available funds to the accounts specified by the
Holders thereof or, if no such account is specified (or if a registered Holder
holds Securities in an aggregate principal amount of less than $1,000,000), by
mailing a check to each such Holder's registered address.

     3.  Ranking and Guarantees.  The Securities are senior unsecured
obligations of the Company.  The Company's obligations to pay principal,
premium, if any, and interest with respect to the Securities are unconditionally
guaranteed on a joint and several basis (the "Guarantees") by the guarantors
(the "Guarantors"), that are from time to time parties to the Indenture.  Each
of the Guarantees is an unsecured obligation of the Guarantor providing such
Guarantee.  Certain limitations to the obligations of the Guarantors, and
certain provisions for the release of the Guarantors, are set forth in further
detail in the Indenture.  References herein to the

                                       3
<PAGE>

Indenture or the Securities shall be deemed also to refer to the Guarantees set
forth in the Indenture except where the context otherwise requires.

     4.  Optional Redemption.  The Company may redeem all or part of the
Securities at any time at its option at a redemption price equal to the greater
of (1) the principal amount of the Securities being redeemed or (2) the Make-
Whole Amount for the Securities being redeemed plus, in each case, accrued and
unpaid interest to the redemption date (the "Redemption Price").

     As used in this Security:

     "Make Whole Amount" means the sum, as determined by a Quotation Agent, of
the present values of the principal amount of the Securities to be redeemed,
together with scheduled payments of interest (exclusive of interest to the
redemption date) from the Redemption Date to the maturity date of the Securities
being redeemed, in each case discounted to the Redemption Date on a semi-annual
basis, assuming a 360-day year consisting of twelve 30-day months, at the
Adjusted Treasury Rate.

     "Adjusted Treasury Rate" means, with respect to any Redemption Date, (i)
the yield, under the heading which represents the average for the immediately
preceding week, appearing in the most recently published statistical release
designated "H.15 (519)" or any successor publication which is published weekly
by the Board of Governors of the Federal Reserve System and which establishes
yields on actively traded United States Treasury securities adjusted to constant
maturity under the caption "Treasury Constant Maturities," for the maturity
corresponding to the Comparable Treasury Issue (if no maturity is within three
months before or after the remaining term of the Securities being redeemed,
yields for the two published maturities most closely corresponding to the
Comparable Treasury Issue shall be determined and the Adjusted Treasury Rate
shall be interpolated or extrapolated from such yields on a straight line basis,
rounding to the nearest month) or (ii) if such release (or any successor
release) is not published during the week preceding the calculation date or does
not contain such yields, the rate per year equal to the semi-annual equivalent
yield to maturity of the Comparable Treasury Issue (expressed as a percentage of
its principal amount) equal to the Comparable Treasury Price for such Redemption
Date, in each case calculated on the third business day preceding the redemption
date, plus 0.25%.

     "Comparable Treasury Issue" means the United States Treasury security
selected by the Quotation Agent as having a maturity comparable to the remaining
term from the Redemption Date to the maturity date of the Securities that would
be utilized, at the time of selection and in accordance with customary financial
practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the notes.

     "Comparable Treasury Price" means, with respect to any Redemption Date, if
clause (ii) of the Adjusted Treasury Rate is applicable, the average of three,
or such lesser number as is obtained by the Trustee, Reference Treasury Dealer
Quotations for such Redemption Date.

     "Quotation Agent" means the Reference Treasury Dealer selected by the
Trustee after consultation with the Company.

                                       4
<PAGE>

     "Reference Treasury Dealer" means any of Credit Suisse First Boston
Corporation and its successors and assigns and two other nationally recognized
investment banking firms selected by the Company that are primary U.S.
Government securities dealers.

     "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer and any Redemption Date, the average, as determined by
the Trustee, of the bid and asked prices for the Comparable Treasury Issue,
expressed in each case as a percentage of its principal amount, quoted in
writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m., New York
City time, on the third Business Day preceding such redemption date.

     5.  Paying Agent and Registrar.  Initially, First Union National Bank (the
"Trustee"), the Trustee under the Indenture, will act as Paying Agent and
Registrar.  The Company may change any Paying Agent, Registrar, co-registrar or
additional paying agent without notice to any Holder.  The Company may act in
any such capacity.

     6.  Indenture.  The Company issued the Securities under an Indenture dated
as of June 8, 2001 (the "Indenture") among the Company, the Guarantors and the
Trustee.  The terms of the Securities include those stated in the Indenture and
those made part of the Indenture by reference to the Trust Indenture Act of
1939, as amended (15 U.S. Code Sections 77aaa-77bbbb), as in effect on the date
of execution of the Indenture.  The Securities are subject to all such terms,
and Holders are referred to the Indenture and such Act for a statement of such
terms.  The Securities are unsecured general obligations of the Company limited
to $350,000,000 in aggregate principal amount in the case of the Notes issued on
the Issue Date (as defined in the Indenture).

     7.  Denominations, Transfer, Exchange.  The Securities are in registered
form without coupons in denominations of $1,000 and integral multiples of
$1,000.  The transfer of Securities may be registered and Securities may be
exchanged as provided in the Indenture.  The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and to pay any taxes and fees required by law or permitted by
the Indenture.  The Registrar need not exchange or register the transfer of any
Securities during the period between a record date and the corresponding
Interest Payment Date.

     8.  Persons Deemed Owners.  The registered Holder of a Security shall be
treated as its owner for all purposes.

     9.  Amendments and Waivers. Except as otherwise provided in Section 8.02 of
the Indenture, the Company, the Guarantors and the Trustee may amend or
supplement the Indenture and the Securities with the written consent (including
consents obtained in connection with a tender offer or exchange offer for
Securities or a solicitation of consents in respect of Securities, provided that
in each case such offer or solicitation is made to all Holders of then
outstanding Securities on equal terms) of the Holders of at least a majority in
principal amount of the then outstanding Securities. Subject to Sections 5.07
and 8.02 of the Indenture, the Holders of a majority in principal amount of the
then outstanding Securities by notice to the Trustee may waive an existing
Default or Event of Default and its consequences (including waivers obtained in
connection with a tender offer or exchange offer for Securities or a
solicitation of consents in respect of Securities, provided that in each case
such offer or solicitation is made to all Holders of then outstanding Securities
on equal terms), except (1) a continuing Default or Event of

                                       5
<PAGE>

Default in the payment of the principal of, or premium, if any, or interest on
any Security or (2) a continuing Default in respect of a provision that under
Section 8.02 of the Indenture cannot be amended with the consent of each Holder
affected. Without the consent of any Holder, the Company, the Guarantors and the
Trustee may amend or supplement the Indenture or the Securities or waive any
provision of the Indenture or the Securities: to cure any ambiguity, omission,
defect or inconsistency; to provide for uncertificated Securities in addition to
or in place of certificated Securities; to comply with Sections 4.01 and 4.02 of
the Indenture; to reflect the release of any Guarantor from its Guarantee, or
the addition of any Subsidiary of the Company as a Guarantor, in the manner
provided by Section 9.06 of the Indenture; to comply with any requirement in
order to effect or maintain the qualification of this Indenture under the Trust
Indenture Act of 1939, as amended (the "TIA"); to add additional guarantees of
the Securities; to comply with any requirements of the SEC in connection with
qualifying the Indenture under the TIA; to add to the covenants of the Company
or any Guarantor for the benefit of the Holders or to surrender any right
conferred upon the Company or any Guarantor in the Indenture; or to make any
change that does not adversely affect the rights of any Holder in any material
respect.

     10.  Defaults and Remedies. If an Event of Default (other than an Event of
Default specified in clause (6) or (7) of Section 5.01 of the Indenture with
respect to the Company or any Material Subsidiary) occurs and is continuing, the
Trustee by notice to the Company, or the Holders of at least 25% in principal
amount of the then outstanding Securities by notice to the Company and the
Trustee, may declare the principal of and premium, if any, and accrued and
unpaid interest on all then outstanding Securities to be due and payable
immediately. If an Event of Default specified in clause (6) or (7) of Section
5.01 of the Indenture with respect to the Company or any Material Subsidiary
occurs, such amounts shall ipso facto become and be immediately due and payable
without any declaration, notice or other act on the part of the Trustee or any
Holder.  The Holders of a majority in principal amount of the then outstanding
Securities by written notice to the Trustee may rescind an acceleration and its
consequences (other than nonpayment of principal of, or premium, if any, or
interest on the Securities) if the rescission would not conflict with any
judgment or decree and if all existing Events of Default have been cured or
waived, except nonpayment of principal, or premium, if any, or interest that has
become due solely because of the acceleration.  Holders may not enforce the
Indenture or the Securities except as provided in the Indenture. The Trustee may
refuse to perform any duty or exercise any right or power unless it receives
indemnity reasonably satisfactory to it against any loss, liability or expense.
Except in the case of a Default or Event of Default in payment of principal of,
or premium, if any, or interest on any Security, the Trustee may withhold notice
of the Default or Event of Default if and so long as a committee of its Trust
Officers in good faith determines that withholding the notice is in the
interests of Holders.  The Company must furnish an annual compliance certificate
to the Trustee, as more fully described in Section 3.04 of the Indenture.

     11.  Discharge Prior to Maturity. As more fully described in, and subject
to, Article VII of the Indenture, the Indenture shall be discharged and canceled
upon the payment of all of the Securities and shall be discharged except for
certain obligations upon the irrevocable deposit with the Trustee of funds or
U.S. Government Obligations sufficient for such payment.

                                       6
<PAGE>

     12.  Trustee Dealings with Company and Guarantors.  The Trustee in its
individual or any other capacity may become the owner or pledgee of Securities
and may otherwise deal with the Company, the Guarantors or any of their
Affiliates with the same rights it would have if it were not Trustee.

     13.  No Recourse Against Others. A director, officer, employee or
stockholder, as such, of the Company or any Guarantor shall not have any
liability for any obligations of the Company or such Guarantor under the
Securities or the Indenture or for any claim based on, in respect of or by
reason of such obligations or their creation. Each Holder by accepting a
Security waives and releases all such liability. The waiver and release are part
of the consideration for the issuance of the Securities.

     14.  Authentication.  This Security shall not be valid until authenticated
by the manual signature of the Trustee or an authenticating agent.

     15.  CUSIP Numbers.  Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Securities as a convenience to the Holders of
the Securities.  No representation is made as to  the accuracy of such numbers
as printed on the Securities and reliance may be placed only on the other
identification numbers printed thereon.

     16.  Abbreviations.  Customary abbreviations may be used in the name of a
Holder or an assignee, such as:  TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

     17.  Additional Rights of Holders of Transfer Restricted Securities.  In
addition to the rights provided to Holders of Securities under the Indenture,
Holders of Transfer Restricted Securities shall have all the rights set forth in
the Registration Rights Agreement relating to such Securities (the "Registration
Rights Agreement"), among the Company, the Guarantors named therein and the
Initial Purchasers.

     THE COMPANY WILL FURNISH TO ANY HOLDER UPON WRITTEN REQUEST AND WITHOUT
CHARGE A COPY OF THE INDENTURE.  REQUEST MAY BE MADE TO:

     PURE RESOURCES, INC.
     500 WEST ILLINOIS
     MIDLAND, TEXAS 79701
     ATTENTION:  CORPORATE SECRETARY

                                       7
<PAGE>

                             NOTATION ON SECURITY

                            RELATING TO GUARANTEES

     Each Guarantor (which term includes any successor Person under the
Indenture), has fully, unconditionally and absolutely guaranteed, to the extent
set forth in the Indenture and subject to the provisions in the Indenture, the
due and punctual payment of the principal of, and premium, if any, and interest
on the Securities and all other amounts due and payable under the Indenture and
the Securities by the Company.

     The obligations of the Guarantors to the Holders of Securities and to the
Trustee pursuant to the Guarantees and the Indenture are expressly set forth in
Article 9 of the Indenture and reference is hereby made to the Indenture for the
precise terms of the Guarantees.

                                        TITAN EXPLORATION, INC.
                                        PURE RESOURCES I, INC.
                                        HALLWOOD PETROLEUM, INC.
                                        PURE GP, LLC
                                        HEP PURE ACQUISITION, LLC

                                        By:   /s/ Jack Hightower
                                            ------------------------------
                                                Jack D. Hightower
                                                President

                                        PURE RESOURCES HOLDINGS, INC.
                                        PURE RESOURCES HOLDINGS, LLC

                                        By:   /s/ Richard Klumpp
                                            ------------------------------
                                        Name:   Richard Klumpp
                                        Title:  Vice President

                                       8
<PAGE>

                                        PURE RESOURCES, L.P.
                                        PK I, L.P.
                                        PK II, L.P.
                                        PK III, L.P.
                                        PK IV, L.P.

                                        By:  PURE RESOURCES I, INC.,
                                             its general partner

                                        By:  /s/ Jack Hightower
                                           -------------------------------
                                             Jack D. Hightower
                                             President

                                        HEP PURE, LP

                                        By:  PURE GP, LLC, its general partner

                                        By:  /s/ Jack Hightower
                                           --------------------------
                                             Jack D. Hightower
                                             President

                                        HALLWOOD ENERGY PARTNERS, L.P.

                                        By:  HEP PURE ACQUISITION, LLC,
                                             its general partner

                                        By:  /s/ Jack Hightower
                                           ------------------------------
                                             Jack D. Hightower
                                             President

                                       9
<PAGE>

                                        LA PLATA ASSOCIATES, LLC
                                        HALLWOOD LA PLATA, LLC

                                        By:  HALLWOOD PETROLEUM, INC.,
                                             its manager

                                        By: /s/ Jack Hightower
                                            ------------------------------
                                            Jack D. Hightower
                                            President

                                       10
<PAGE>

                                ASSIGNMENT FORM

     To assign this Security, fill in the form below: (I) or (we) assign and
transfer this Security to _________________________________________

______________________________________________________________________________
(Insert assignee's social security or tax I.D. number)

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________
(Print or type assignee's name, address and zip code)

and irrevocably appoint _______________________________________________________
as agent to transfer this Security on the books of the Company.  The agent may
substitute another to act for him.

______________________________________________________________________________

Date: ___________________________

Your Signature: ________________________________________________________________
                (Sign exactly as your name appears on the face of this Security)

Signature Guarantee:____________________________________________________________
                    (Participant in a Recognized Signature Guaranty Medallion
                     Program)

                                       11
<PAGE>

                     SCHEDULE OF EXCHANGES OF SECURITIES*

     The following exchanges, redemptions or repurchases of a part of this
Global Security have been made:

<TABLE>
<CAPTION>
<S>                     <C>                       <C>                        <C>                      <C>
Date of Transaction     Amount of decrease in     Amount of increase in      Principal Amount of      Signature of authorized
                         Principal Amount of       Principal Amount of         Global Security          Officer, Trustee or
                           Global Security           Global Security        following decrease (or      Security Custodian
                                                                            increase)

</TABLE>
     ______________________

     *  This should be included only if the Security is issued in global form.

                                       12<PAGE>

                                                                   EXHIBIT 10.12

                                 $350,000,000

                             Pure Resources, Inc.

                          71/8% Senior Notes Due 2011

                              PURCHASE AGREEMENT
                              ------------------

                                                                    June 5, 2001

CREDIT SUISSE FIRST BOSTON CORPORATION
FIRST UNION SECURITIES, INC.
BNP PARIBAS SECURITIES CORP.
FLEET SECURITIES, INC.
CREDIT LYONNAIS SECURITIES (USA) INC.
BNY CAPITAL MARKETS, INC.
WELLS FARGO BROKERAGE, LLC
C/O CREDIT SUISSE FIRST BOSTON CORPORATION
      Eleven Madison Avenue
      New York, New York 10010-3629

As Representatives of the Several Purchasers,
c/o Credit Suisse First Boston Corporation,
      Eleven Madison Avenue,
      New York, N.Y. 10010-3629

Dear Sirs:

          1.   Introductory.  Pure Resources, Inc., a Delaware corporation (the
"Company"), proposes, subject to the terms and conditions stated herein, to
issue and sell to the several initial purchasers named in Schedule A hereto (the
"Purchasers") U.S.$350,000,000 principal amount of its 7?% Senior Notes due 2011
(the "Notes") to be issued under an indenture dated as of June 8, 2001 (the
"Indenture"), between the Company, the Guarantors (as defined below) and First
Union National Bank, as Trustee (the "Trustee") on a private placement basis
pursuant to an exemption under Section 4(2) of the United States Securities Act
of 1933 (the "Securities Act"), and hereby agrees with the several Purchasers as
follows:

          Initially, the Notes will be guaranteed (the "Guarantees" and together
with the Notes, the "Offered Securities") on a senior unsecured basis by Titan
Exploration, Inc., a Delaware corporation, Pure Resources Holdings, Inc., a
Nevada corporation, Pure Resources, L.P., a Texas limited partnership, Pure
Resources I, Inc., a Delaware corporation, Hallwood Petroleum, Inc., a Delaware
corporation, PK I, L.P., PK II, L.P., PK III, L.P., PK IV, L.P., HEP Pure, LP,
and Hallwood Energy Partners, L.P., each of which is a Delaware limited
partnership, Pure GP, LLC and HEP Pure Acquisition, LLC, each of which is a
Delaware limited liability company, Pure Resources Holdings, LLC, a Nevada
limited liability company, and La Plata Associates, LLC and Hallwood La Plata,
LLC, each of which is a Colorado limited liability company (collectively, the
"Guarantors" and, together with the Company, the "Issuers").

          2.   Representations and Warranties of the Issuers. The Issuers,
jointly and severally, represent and warrant to, and agree with, the several
Purchasers that:

               (a)  A preliminary offering circular and an offering circular
          relating to the Offered Securities to be offered by the Purchasers has
          been prepared by the Company. Such preliminary offering circular (the
          "Preliminary Offering Circular") and offering circular (the "Offering
          Circular"), as supplemented as of the date of this Agreement, together
          with any other document incorporated by reference thereto or approved
          by the Company for use in connection with the contemplated resale of
          the Offered Securities, are
<PAGE>

     hereinafter collectively referred to as the "Offering Document". On the
     date of this Agreement, the Offering Document does not include any untrue
     statement of a material fact or omit to state any material fact necessary
     in order to make the statements therein, in the light of the circumstances
     under which they were made, not misleading. The preceding sentence does not
     apply to statements in or omissions from the Offering Document based upon
     written information furnished to the Company by any Purchaser through
     Credit Suisse First Boston Corporation ("CSFBC") specifically for use
     therein, it being understood and agreed that the only such information is
     that described as such in Section 7(b) hereof. Except as disclosed in the
     Offering Document, on the date of this Agreement, the Company's Annual
     Report on Form 10?K most recently filed with the Securities and Exchange
     Commission (the "Commission") and all other reports (collectively, the
     "Exchange Act Reports") which have been filed by the Company with the
     Commission or sent to stockholders pursuant to the Securities Exchange Act
     of 1934 (the "Exchange Act") after January 1, 2001, do not include any
     untrue statement of a material fact or omit to state any material fact
     necessary to make the statements therein, in the light of the circumstances
     under which they were made, not misleading. Such documents, when they were
     filed with the Commission, conformed in all material respects to the
     requirements of the Exchange Act and the rules and regulations of the
     Commission thereunder. To the best of the Company's knowledge, the Annual
     Report on Form 10-K for the year ended December 31, 2001 filed with the
     Commission by Hallwood Energy Corporation ("Hallwood") and all other
     reports (collectively, the "Hallwood Exchange Act Reports") which have been
     filed by Hallwood with the Commission or sent to Hallwood's stockholders
     pursuant to the Exchange Act after January 1, 2001, do not include any
     untrue statement of material fact or omit to state any material fact
     necessary to make the statements therein, in the light of the circumstances
     under which they were made, not misleading. To the best of the Company's
     knowledge, the Hallwood Exchange Act Reports, when they were filed with the
     Commission, conformed in all material respects to the requirements of the
     Exchange Act and the rules and regulations of the Commission thereunder.

          (b)  The Offered Securities have been duly authorized by the Company
     and, when delivered and paid for pursuant to this Agreement and the
     Indenture, will have been duly executed, authenticated, issued and
     delivered and will constitute valid and legally binding obligations of the
     Company, entitled to the benefits provided in the Indenture and enforceable
     in accordance with their terms, subject to bankruptcy, insolvency,
     fraudulent transfer, reorganization, moratorium and similar laws of general
     applicability relating to or affecting creditors' rights and to general
     equity principles..

          (c)  The Indenture has been duly authorized by each of the Issuers;
     the Notes and the Guarantees have been duly authorized by the Company and
     each of the Guarantors, respectively; and, when the Notes and the
     Guarantees are delivered and paid for pursuant to this Agreement on the
     Closing Date (as defined below), the Indenture will have been duly executed
     and delivered by each of the Issuers, the Notes and the Guarantees will
     have been duly executed, authenticated, issued and delivered by the Company
     and each of the Guarantors, respectively, and will conform to the
     description thereof in the Offering Document; assuming due authorization,
     execution and delivery of the Indenture by the Trustee and the
     authentication of the Notes by the Trustee, the Indenture and the Notes
     will constitute valid and legally binding obligations of the Company,
     enforceable in accordance with their terms, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles; and, assuming due authorization,
     execution and delivery of the Indenture by the Trustee, the Indenture and
     the Guarantees will constitute valid and legally binding obligations of the
     Guarantors, enforceable in accordance with their terms, subject to
     bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
     similar laws of general applicability relating to or affecting creditors'
     rights and to general equity principles.

          (d)  The Company has been duly incorporated and is an existing
     corporation in good standing under the laws of the State of Delaware, with
     power and authority (corporate and other) to own its properties and conduct
     its business as described in the Offering Document; and the Company is duly
     qualified to do business as a foreign corporation in good standing in all
     other jurisdictions in which its ownership or lease of property or the
     conduct of its business requires such qualification, except where the
     failure so to qualify would not have a material adverse effect on the
     condition (financial or other), business, properties or results of
     operations of the Company and its subsidiaries taken as a whole ("Material
     Adverse Effect").

                                      -2-
<PAGE>

          (e)  Each Guarantor and each Significant Subsidiary (as defined in
     Regulation S-X under the Securities Act, but excluding Hallwood
     Consolidated Resources Corporation (which will be merged out of existence
     as of 11:58 p.m., Eastern Daylight Savings Time, on the date of this
     Agreement), HEC Acquisition Corp. (which will be converted into HEP Pure
     Acquisition, LLC as of 11:58 p.m., Eastern Daylight Savings Time, on the
     date of this Agreement) and Hallwood Energy Corporation (which will be
     converted into HEP Pure, LP as of 11:59 p.m., Eastern Daylight Savings
     Time, on the date of this Agreement)) of the Company has been duly
     incorporated or organized, as the case may be, and is an existing entity in
     good standing under the laws of the jurisdiction of its respective
     incorporation or organization, with power and authority to own its
     properties and conduct its business as described in the Offering Document;
     and each Guarantor and each Significant Subsidiary of the Company is duly
     qualified to do business as a foreign corporation, partnership or limited
     liability company in good standing in all other jurisdictions in which its
     ownership or lease of property or the conduct of its business requires such
     qualification, except where the failure to so qualify would not have a
     Material Adverse Effect and except for the qualification of the Guarantors
     in the jurisdictions noted on Exhibit A, which those Guarantors are in the
     process of filing; all of the issued and outstanding capital stock or other
     equity interests of each Guarantor and each Significant Subsidiary of the
     Company has been duly authorized and validly issued and is fully paid and
     nonassessable; and the capital stock or other equity interests of each
     Guarantor and each Significant Subsidiary owned by the Company, directly or
     through subsidiaries, is owned free from liens, encumbrances and defects.

          (f)  Except as disclosed in the Offering Document, there are no
     contracts, agreements or understandings between the Company and any person
     that would give rise to a valid claim against the Company or any Purchaser
     for a brokerage commission, finder's fee or other like payment.

          (g)  Assuming the accuracy of the representations of the Purchasers in
     Section 4, no consent, approval, authorization, or order of, or filing
     with, any governmental agency or body or any court is required for the
     consummation of the transactions contemplated by this Agreement and the
     Registration Rights Agreement dated the date hereof, between the Company,
     the Guarantors and the Purchasers (the "Registration Rights Agreement") in
     connection with the issuance and sale of the Offered Securities by the
     Company and the Guarantors, except for such as may be required under
     federal securities laws in connection with the Registration Rights
     Agreement or such as may be required by state or foreign securities laws.

          (h)  The execution, delivery and performance of the Indenture, this
     Agreement and the Registration Rights Agreement by the Issuers, and the
     issuance and sale of the Offered Securities by the Issuers and compliance
     with the terms and provisions thereof will not result in a breach or
     violation of any of the terms and provisions of, or constitute a default
     under, (A) any statute, any rule, regulation or order of any governmental
     agency or body or any court, domestic or foreign, having jurisdiction over
     the Company or any subsidiary of the Company or any of their properties,
     (B) any agreement or instrument to which the Company or any such subsidiary
     is a party or by which the Company or any such subsidiary is bound or to
     which any of the properties of the Company or any such subsidiary is
     subject, or (C) the charter or by-laws (or comparable governing documents)
     of the Company or any such subsidiary except, in the case of (A) and (B)
     for such breaches, violations or defaults as would not have a Material
     Adverse Effect.  The Issuers have full power and authority to authorize,
     issue and sell the Offered Securities as contemplated by this Agreement.

          (i)  This Agreement and the Registration Rights Agreement have been
     duly authorized, executed and delivered by the Company and each of the
     Guarantors.

          (j)  Except as disclosed in the Offering Document and except for such
     defects of title that in the aggregate would not have a Material Adverse
     Effect, the Company and its subsidiaries have good and marketable title to
     all real properties and all other properties and assets owned by them, in
     each case free from liens, encumbrances and defects that would materially
     affect the value thereof or materially interfere with the use made or to be
     made thereof by them; and except as disclosed in the Offering Document and
     except for such liens, encumbrances, defects and exceptions as would not
     have a Material Adverse Effect,

                                      -3-
<PAGE>

     the Company and its subsidiaries hold any leased real or personal property
     under valid and enforceable leases with no exceptions that would materially
     interfere with the use made or to be made thereof by them.

          (k)  The Company and its subsidiaries possess adequate certificates,
     authorities or permits issued by appropriate governmental agencies or
     bodies necessary to conduct the business now operated by them except for
     those the absence of which would not have a Material Adverse Effect and
     have not received any notice of proceedings relating to the revocation or
     modification of any such certificate, authority or permit that, if
     determined adversely to the Company or any of its subsidiaries, would
     individually or in the aggregate have a Material Adverse Effect.

          (l)  No labor dispute with the employees of the Company or any
     subsidiary exists or, to the knowledge of the Company, is imminent that
     might have a Material Adverse Effect.

          (m)  The Company and its subsidiaries own, possess or can acquire on
     reasonable terms, adequate trademarks, trade names and other rights to
     inventions, know-how, patents, copyrights, confidential information and
     other intellectual property (collectively, "intellectual property rights")
     necessary to conduct the business now operated by them, or presently
     employed by them, except for those the absence of which would not have a
     Material Adverse Effect, and have not received any notice of infringement
     of or conflict with asserted rights of others with respect to any
     intellectual property rights that, if determined adversely to the Company
     or any of its subsidiaries, would individually or in the aggregate have a
     Material Adverse Effect.

          (n)  Except as disclosed in the Offering Document, neither the Company
     nor any of its subsidiaries is in violation of any statute, any rule,
     regulation, decision or order of any governmental agency or body or any
     court, domestic or foreign, relating to the use, disposal or release of
     hazardous or toxic substances or relating to the protection or restoration
     of the environment or human exposure to hazardous or toxic substances
     (collectively, "environmental laws"), owns or operates any real property
     contaminated with any substance that is subject to any environmental laws,
     is liable for any off-site disposal or contamination pursuant to any
     environmental laws, or is subject to any claim relating to any
     environmental laws, which violation, contamination, liability or claim
     would individually or in the aggregate have a Material Adverse Effect; and
     the Company is not aware of any pending investigation which might lead to
     such a claim.

          (o)  Except as disclosed in the Offering Document, there are no
     pending actions, suits or proceedings against or affecting the Company, any
     of its subsidiaries or any of their respective properties that, if
     determined adversely to the Company or any of its subsidiaries, would
     individually or in the aggregate have a Material Adverse Effect, or would
     materially and adversely affect the ability of the Issuers to perform their
     respective obligations under the Indenture, this Agreement or the
     Registration Rights Agreement, and no such actions, suits or proceedings
     are threatened or, to the Company's knowledge, contemplated.

          (p)  The financial statements (other than those of Hallwood), together
     with the related schedules and notes, included in the Offering Document
     present fairly the consolidated financial position of the Company and its
     consolidated subsidiaries as of the dates shown and their results of
     operations and cash flows for the periods shown, and such financial
     statements have been prepared in conformity with the generally accepted
     accounting principles in the United States applied on a consistent basis;
     and the assumptions used in preparing the pro forma financial statements
     included in the Offering Document provide a reasonable basis for presenting
     the significant effects directly attributable to the transactions or events
     described therein, the related pro forma adjustments give appropriate
     effect to those assumptions, and the pro forma columns therein reflect the
     proper application of those adjustments to the corresponding historical
     financial statement amounts.  To the best of the Company's knowledge, the
     financial statements of Hallwood, together with the related schedules and
     notes, included in the Offering Document present fairly the consolidated
     financial position of Hallwood and its consolidated subsidiaries as of the
     dates shown and their results of operations and cash flows for the periods
     shown, and such financial statements have been prepared in conformity with
     the generally accepted accounting principles in the United States applied
     on a consistent basis.

                                      -4-
<PAGE>

          (q)  Except as disclosed in the Offering Document, since the date of
     the latest audited financial statements included in the Offering Document
     there has been no material adverse change, nor any development or event
     involving a prospective material adverse change, in the condition
     (financial or other), business, properties or results of operations of the
     Company and its subsidiaries taken as a whole, and, except as disclosed in
     or contemplated by the Offering Document, there has been no dividend or
     distribution of any kind declared, paid or made by the Company on any class
     of its capital stock.

          (r)  The oil and gas reserve, statistical and market-related data
     included in the Offering Document are based on or derived from sources that
     the Company believes to be reliable and accurate.

          (s)  None of the Issuers is an open-end investment company, unit
     investment trust or face-amount certificate company that is or is required
     to be registered under Section 8 of the United States Investment Company
     Act of 1940 (the "Investment Company Act") ; and none of the Issuers is
     nor, after giving effect to the offering and sale of the Offered Securities
     and the application of the proceeds thereof as described in the Offering
     Document, will be an "investment company" as defined in the Investment
     Company Act.

          (t)  No securities of the same class (within the meaning of Rule
     144A(d)(3) under the Securities Act) as the Offered Securities are listed
     on any national securities exchange registered under Section 6 of the
     Exchange Act or quoted in a U.S. automated inter-dealer quotation system.

          (u)  Assuming the accuracy of the representations and warranties of
     the Purchasers in Section 4, the offer and sale of the Offered Securities
     by the Issuers to the several Purchasers in the manner contemplated by this
     Agreement will be exempt from the registration requirements of the
     Securities Act by reason of Section 4(2) thereof and Regulation S; and it
     is not necessary in connection with the offer and sale of the Offered
     Securities to the Purchasers to qualify an indenture in respect of the
     Offered Securities under the United States Trust Indenture Act of 1939, as
     amended (the "Trust Indenture Act").

          (v)  Neither the Company, nor any of its affiliates, nor any person
     acting on its or their behalf (i) has, within the six-month period prior to
     the date hereof, offered or sold in the United States or to any U.S. person
     (as such terms are defined in Regulation S under the Securities Act) the
     Offered Securities or any security of the same class or series as the
     Offered Securities or (ii) has offered or will offer or sell the Offered
     Securities (A) in the United States by means of any form of general
     solicitation or general advertising within the meaning of Rule 502(c) under
     the Securities Act or (B) with respect to any securities sold in reliance
     on Rule 903 of Regulation S, by means of any directed selling efforts
     within the meaning of Rule 902(c) of Regulation S. The Company has not
     entered and will not enter into any contractual arrangement with respect to
     the distribution of the Offered Securities except for this Agreement and
     the Registration Rights Agreement.

          (w)  The Company is subject to Section 13 or 15(d) of the Exchange
     Act.

          (x)  There is no "substantial U.S. market interest" as defined in Rule
     902(j) of Regulations S in the Company's debt securities.

          (y)  As of the Closing Date, the Guarantors will include all of the
     guarantors as of the Closing Date under that certain credit agreement by
     and among the Company, The Chase Manhattan Bank, as Administrative Agent,
     First Union National Bank, as Syndication Agent, BNP Paribas, as
     Documentation Agent, and the Lenders party thereto, dated as of September
     29, 2000.

                                      -5-
<PAGE>

      3.  Purchase, Sale and Delivery of Offered Securities.  On the basis of
the representations, warranties and agreements herein contained, but subject to
the terms and conditions herein set forth, the Company agrees to sell to the
Purchasers, and the Purchasers agree, severally and not jointly, to purchase
from the Issuers, at a purchase price of 98.594% of the principal amount thereof
plus accrued interest from June 8, 2001 to the Closing Date (as hereinafter
defined) the respective principal amounts of Offered Securities set forth
opposite the names of the several Purchasers in Schedule A hereto.

     The Issuers will deliver against payment of the purchase price the Offered
Securities in the form of one or more permanent global securities in definitive
form (the "Global Securities") deposited with the Trustee as custodian for The
Depository Trust Company ("DTC") and registered in the name of Cede & Co., as
nominee for DTC. Interests in any permanent Global Securities will be held only
in book-entry form through DTC, except in the limited circumstances described in
the Offering Document.  Payment for the Offered Securities shall be made by the
Purchasers in Federal (same day) funds by official check or checks or wire
transfer to an account at a bank acceptable to CSFBC drawn to the order of Pure
Resources, Inc. at the office of Thompson & Knight L.L.P., Dallas, Texas at 9:30
A.M. (New York time), on June 8, 2001, or at such other time not later than
seven full business days thereafter as CSFBC and the Company determine, such
time being herein referred to as the "Closing Date", against delivery to the
Trustee as custodian for DTC of the Global Securities representing all of the
Offered Securities. The Global Securities will be made available for checking at
the above office of Thompson & Knight L.L.P. at least 24 hours prior to the
Closing Date.

     4.   Representations by Purchasers; Resale by Purchasers.  (a) Each
Purchaser severally represents and warrants to the Company that it is an
"accredited investor" within the meaning of Regulation D under the Securities
Act.

     (b)  Each Purchaser severally acknowledges that the Offered Securities have
not been registered under the Securities Act and may not be offered or sold
within the United States or to, or for the account or benefit of, U.S. persons
except in accordance with Regulation S or pursuant to an exemption from the
registration requirements of the Securities Act.  Each Purchaser severally
represents and agrees that it has offered and sold the Offered Securities and
will offer and sell the Offered Securities as part of their distribution at any
time and only in accordance with Rule 144A ("Rule 144A") or Rule 903 under the
Securities Act.  Accordingly, neither such Purchaser nor its affiliates, nor any
persons acting on its behalf, have engaged or will engage in any directed
selling efforts with respect to the Offered Securities, and such Purchaser, its
affiliates and all persons acting on its or their behalf have complied and will
comply with the offering restrictions requirement of Regulation S.  Each
Purchaser severally agrees that, at or prior to confirmation of the sale of the
Offered Securities, other than a sale pursuant to Rule 144A, the Purchaser will
have sent to each distributor, dealer or person receiving a selling concession,
fee or other remuneration that purchases the Offered Securities from it during
the 40?day period after the later of commencement of the offering and the
Closing Date a confirmation or notice to substantially the following effect:

          "The Securities covered hereby have not been registered under the U.S.
     Securities Act of 1933, as amended (the "Securities Act"), and may not be
     offered or sold within the United States or to, or for the account or
     benefit of, U.S. persons (i) as part of their distribution at any time or
     (ii) otherwise until 40 days after the later of the date of the
     commencement of the offering and the closing date, except in either case in
     accordance with Regulation S (or Rule 144A if available) under the
     Securities Act.  Terms used above have the meanings given to them by
     Regulation S."

     Term used in this subsection (b) have the meanings given to them by
Regulation S.

     (c)  Each Purchaser severally agrees that it and each of its affiliates has
not entered and will not enter into any contractual arrangement with respect to
the distribution of the Offered Securities except for any such arrangements with
the other Purchasers or affiliates of the other Purchasers or with the prior
written consent of the Company.

     (d)  Each Purchaser severally agrees that it and each of its affiliates
will not offer or sell the Offered Securities by means of any form of general
solicitation or general advertising, within the meaning of Rule 502(c) under the
Securities Act, including, but not limited to (i) any advertisement, article,
notice or other communication published in any newspaper, magazine or similar
media or broadcast over television or radio, or (ii) any seminar or

                                      -6-
<PAGE>

meeting whose attendees have been invited by any general solicitation or general
advertising. Each Purchaser severally agrees, with respect to resales made in
reliance on Rule 144A of any of the Offered Securities, to deliver either with
the confirmation of such resale or otherwise prior to settlement of such resale
a notice to the effect that the resale of such Offered Securities has been made
in reliance upon the exemption from the registration requirements of the
Securities Act provided by Rule 144A.

     (e)  Each of the Purchasers severally represents and agrees that (i) it has
not offered or sold and prior to the date six months after the date of issue of
the Offered Securities will not offer or sell any Offered Securities to persons
in the United Kingdom except to persons whose ordinary activities involve them
in acquiring, holding, managing or disposing of investments (as principal or
agent) for the purposes of their businesses or otherwise in circumstances which
have not resulted and will not result in an offer to the public in the United
Kingdom within the meaning of the Public Offers of Securities Regulations 1995;
(ii) it has complied and will comply with all applicable provisions of the
Financial Services Act of 1986 with respect to anything done by it in relation
to the Offered Securities in, from or otherwise involving the United Kingdom;
and (iii) it has only issued or passed on and will only issue or pass on in the
United Kingdom any document received by it in connection with the issue of the
Offered Securities to a person who is of a kind described in Article 11(3) of
the Financial Services Act 1986 (Investment Advertisements) (Exemptions) Order
1996 or is a person to whom such document may otherwise lawfully be issued or
passed on.

     5.   Certain Agreements of the Issuers.  The Issuers agree with the several
     Purchasers that:

          (a)  The Company will advise CSFBC promptly of any proposal to amend
     or supplement the Offering Document and will not effect such amendment or
     supplementation without CSFBC's consent, which consent shall not be
     unreasonably withheld. If, at any time prior to the completion of the
     resale of the Offered Securities by the Purchasers any event occurs as a
     result of which the Offering Document as then amended or supplemented would
     include an untrue statement of a material fact or omit to state any
     material fact necessary in order to make the statements therein, in the
     light of the circumstances under which they were made, not misleading, the
     Company promptly will notify CSFBC of such event and promptly will prepare,
     at its own expense, an amendment or supplement which will correct such
     statement or omission. Neither CSFBC's consent to, nor Purchasers' delivery
     to offerees or investors of, any such amendment or supplement shall
     constitute a waiver of any of the conditions set forth in Section 6.

          (b)  The Company will furnish to CSFBC copies of any preliminary
     offering circular, the Offering Document and all amendments and supplements
     to such documents, in each case as soon as available and in such quantities
     as CSFBC reasonably requests.  At any time when the Company is not subject
     to Section 13 or 15(d) of the Exchange Act, the Issuers will promptly
     furnish or cause to be furnished to CSFBC (and, upon request, to each of
     the other Purchasers) and, upon request of holders and prospective
     purchasers of the Offered Securities, to such holders and purchasers,
     copies of the information required to be delivered to holders and
     prospective purchasers of the Offered Securities pursuant to Rule
     144A(d)(4) under the Securities Act (or any successor provision thereto) in
     order to permit compliance with Rule 144A in connection with resales by
     such holders of the Offered Securities.  The Issuers will pay the expenses
     of printing and distributing to the Purchasers all such documents.

          (c)  The Issuers will endeavor in good faith cooperation with the
     Purchasers to arrange for the qualification of the Offered Securities for
     sale and the determination of their eligibility for investment under the
     laws of such states in the United States as CSFBC designates and will
     continue such qualifications in effect so long as required for the resale
     of the Offered Securities by the Purchasers provided that the Issuers will
     not be required to qualify as a foreign corporation or as a dealer of
     securities to file a general consent to service of process or subject
     itself to taxation in any such state.

          (d)  So long as any of the Offering Securities are outstanding, the
     Company will, upon request, furnish to CSFBC and to each of the other
     Purchasers, as soon as practicable after the end of each fiscal year, a
     copy of its annual report to stockholders for such year; and, upon request,
     the Company will furnish to CSFBC and to each of the other Purchasers (i)
     as soon as available, a copy of each report and any definitive proxy
     statement of the Company filed with the Commission under the Exchange Act
     or mailed to

                                      -7-
<PAGE>

     stockholders, and (ii) from time to time, such other information concerning
     the Issuers as CSFBC may reasonably request.

          (e)  During the period of two years after the Closing Date or, if
     earlier, until such time as the Offered Securities are no longer restricted
     securities as defined in Rule 144, the Company will, upon request, furnish
     to CSFBC, each of the other Purchasers and any holder of Offered Securities
     a copy of the restrictions on transfer applicable to the Offered
     Securities.

          (f)  During the period of two years after the Closing Date or, if
     earlier, until such time as the Offered Securities are no longer restricted
     securities as defined in Rule 144, the Issuers will not, and will not
     permit any of their affiliates (as defined in Rule 144 under the Securities
     Act) to, resell any of the Offered Securities that have been reacquired by
     any of them.

          (g)  During the period of two years after the Closing Date, none of
     the Issuers will be or become, an open-end investment company, unit
     investment trust or face-amount certificate company that is or is required
     to be registered under Section 8 of the Investment Company Act.

          (h)  The Issuers will pay all expenses incidental to the performance
     of its obligations under this Agreement, the Indenture and the Registration
     Rights Agreement including (i) the fees and expenses of the Trustee and its
     professional advisers; (ii) all expenses in connection with the execution,
     issue, authentication, packaging and initial delivery of the Offered
     Securities and, as applicable, the Exchange Securities (as defined in the
     Registration Rights Agreement), the preparation and printing of this
     Agreement, the Registration Rights Agreement, the Offered Securities, the
     Indenture, the Offering Document and amendments and supplements thereto,
     and any other document relating to the issuance, offer, sale and delivery
     of the Offered Securities and as applicable the Exchange Securities; (iii)
     for any expenses (including reasonable fees and disbursements of counsel),
     which are not based on the value of the securities issued) incurred in
     connection with qualification of the Offered Securities or the Exchange
     Securities for sale under the laws of such jurisdictions as CSFBC
     designates and the printing of memoranda relating thereto, (iv) for any
     fees charged by investment rating agencies for the rating of the Securities
     or the Exchange Securities, and (v) for reasonable and necessary expenses
     incurred in distributing preliminary offering circulars and the Offering
     Document (including any amendments and supplements thereto) to the
     Purchasers.

          (i)  In connection with the offering, until CSFBC shall have notified
     the Company and the other Purchasers of the completion of the resale of the
     Offered Securities, neither the Issuers nor any of their affiliates has or
     will, either alone or with one or more other persons, bid for or purchase
     for any account in which the Issuers or any of their affiliates has a
     beneficial interest any Offered Securities or attempt to induce any person
     to purchase any Offered Securities; and neither the Issuers nor any of
     their affiliates will make bids or purchases for the purpose of creating
     actual, or apparent, active trading in, or of raising the price of, the
     Offered Securities.

          (j)  For a period of 60 days after the date of the initial offering of
     the Offered Securities by the Purchasers, neither the Issuers nor any of
     their affiliates will offer, sell, contract to sell, pledge, or otherwise
     dispose of, directly or indirectly, any United States dollar-denominated
     debt securities issued or guaranteed by the Issuers and having a maturity
     of more than one year from the date of issue without the prior written
     consent of CSFBC.  Neither the Issuers nor any of their affiliates will at
     any time offer, sell, contract to sell, pledge or otherwise dispose of,
     directly or indirectly, any securities under circumstances where such
     offer, sale, pledge, contract or disposition would cause the exemption
     afforded by Section 4(2) of the Securities Act or the safe harbor under
     Regulation S thereunder  to cease to be applicable to the offer and sale of
     the Offered Securities.

                                      -8-
<PAGE>

     6.   Conditions of the Obligations of the Purchasers. The obligations of
the several Purchasers to purchase and pay for the Offered Securities will be
subject to the accuracy of the representations and warranties on the part of the
Company herein, to the accuracy of the statements of officers of the Issuers
made pursuant to the provisions hereof, to the performance by the Issuers of
their obligations hereunder and to the following additional conditions
precedent:

          (a)   The Purchasers shall have received a letter, dated the date of
     this Agreement, of KPMG LLP confirming that they are independent public
     accountants under Rule 101 of the AICPA's Code of Professional Conduct and
     to the effect that:

          (i)   In their opinion the financial statements examined by them and
     included in the Offering Document and in the Exchange Act Reports comply as
     to form in all material respects with the applicable accounting
     requirements of the Securities Act and the related published Rules and
     Regulations, except as to requirements for consolidating financial
     information for the Guarantors;

          (ii)  they have performed the procedures specified by the American
     Institute of Certified Public Accountants for a review of interim financial
     information as described in Statement of Auditing Standards No. 71, Interim
     Financial Information, on the unaudited financial statements of the Company
     incorporated by reference in the Offering Document; and

          (iii) on the basis of the review referred to in clause (ii) above, a
     reading of the latest available interim financial statements of the
     Company, inquiries of officials of the Company who have responsibility for
     financial and accounting matters and other specified procedures, nothing
     came to their attention that caused them to believe that:

               (A)  the unaudited financial statements of the Company
          incorporated by reference in the Offering Document or in the Exchange
          Act Reports do not comply as to form in all material respects with the
          applicable accounting requirements of the Securities Act and the
          related published Rules and Regulations or any material modifications
          should be made to such unaudited financial statements for them to be
          in conformity with generally accepted accounting principles;

               (B)  the unaudited pro forma financial statements included in the
          Offering Documents or in the Exchange Act Reports do not comply as to
          form in all material respects with the accounting requirements of the
          Securities Act and the related published Rules and Regulations or the
          pro forma adjustments have not properly been applied to the historical
          amounts in the compilation of those statements;

               (C)  at the date of the latest available balance sheet read by
          such accountants, or at a subsequent specified date not more than
          three business days prior to the date of this Agreement, there was any
          change in the capital stock or any increase in short-term indebtedness
          or long-term debt of the Company and its consolidated subsidiaries or,
          at the date of the latest available balance sheet read by such
          accountants, there was any decrease in consolidated stockholders'
          equity, as compared with amounts shown on the latest balance sheet
          incorporated by reference in the Offering Document; or

               (D)  for the period from the closing date of the latest income
          statement included in the Offering Document and the Exchange Act
          Reports to the closing date of the latest available income statement
          read by such accountants there were any decreases, as compared with
          the corresponding period of the previous year, in consolidated
          revenues, consolidated operating income, consolidated net income or in
          the ratio of earnings to fixed charges;

                                      -9-
<PAGE>

          except in all cases set forth in clauses (C) and (D) above for
          changes, increases or decreases which the Offering Document and the
          Exchange Act Reports disclose have occurred or may occur or which are
          described in such letter; and

          (iv) they have compared specified dollar amounts (or percentages
     derived from such dollar amounts) and other financial information contained
     in the Offering Document and the Exchange Act Reports (in each case to the
     extent that such dollar amounts, percentages and other financial
     information are derived from the general accounting records of the Company
     and its subsidiaries subject to the internal controls of the Company's
     accounting system or are derived directly from such records by analysis or
     computation) with the results obtained from inquiries, a reading of such
     general accounting records and other procedures specified in such letter
     and have found such dollar amounts, percentages and other financial
     information to be in agreement with such results, except as otherwise
     specified in such letter.

     (b)  The Purchasers shall have received a letter, dated the date of this
Agreement, of PricewaterhouseCoopers LLP confirming that they are independent
public accountants under Rule 101 of the AICPA's Code of professional Conduct
and to the effect that:

          (i)  In their opinion the financial statements examined by them and
     included in the Offering Document and in the Exchange Act Reports comply as
     to form in all material respects with the applicable accounting
     requirements of the Securities Act and the related published Rules and
     Regulations; and

          (ii) they have compared specified dollar amounts (or percentages
     derived from such dollar amounts) and other financial information contained
     in the Offering Document and the Exchange Act Reports (in each case to the
     extent that such dollar amounts, percentages and other financial
     information are derived from the general accounting records of the Company
     and its subsidiaries subject to the internal controls of the Company's
     accounting system or are derived directly from such records by analysis or
     computation) with the results obtained from inquiries, a reading of such
     general accounting records and other procedures specified in such letter
     and have found such dollar amounts, percentages and other financial
     information to be in agreement with such results, except as otherwise
     specified in such letter.

     (c)  The Purchasers shall have received a letter, dated the date of this
Agreement, of Deloitte & Touche LLP confirming that they are independent public
accountants under Rule 101 of the AICPA's Code of Professional Conduct and to
the effect that:

          (i)   In their opinion the financial statements examined by them and
     included in the Hallwood Exchange Act Reports comply as to form in all
     material respects with the applicable accounting requirements of the
     Exchange Act and the related published Rules and Regulations;

          (ii)  they have performed the procedures specified by the American
     Institute of Certified Public Accountants for a review of interim financial
     information as described in Statement of Auditing Standards No. 71, Interim
     Financial Information, on the unaudited financial statements of Hallwood
     incorporated by reference into the offering circular;

          (iii) on the basis of the review referred to in clause (ii) above, a
     reading of the latest available interim financial statements of Hallwood,
     inquiries of officials of Hallwood who have responsibility for financial
     and accounting matters and other specified procedures, nothing came to
     their attention that caused them to believe that:

                (A) the unaudited financial statements of Hallwood incorporated
          by reference in the Offering Document or in the Hallwood Exchange Act
          Reports do not comply as to form in all material respects with the
          applicable accounting requirements of the Exchange Act and the related
          published Rules and Regulations or any material

                                      -10-
<PAGE>

          modifications should be made to such unaudited financial statements
          for them to be in conformity with generally accepted accounting
          principles; or

                (B) at the date of the latest available balance sheet of
          Hallwood read by such accountants, or at a subsequent specified date
          not more than three business days prior to the date of this Agreement,
          there was any change in the capital stock or any increase in short-
          term indebtedness or long-term debt of Hallwood and its consolidated
          subsidiaries; and

          (iv) they have compared specified dollar amounts and other financial
     information of Hallwood incorporated by reference in the Offering Document
     (in each case to the extent that such dollar amounts, percentages and other
     financial information are derived form the general accounting records of
     Hallwood and its subsidiaries subject to the internal controls of
     Hallwood's accounting system or are derived directly from such records by
     analysis or computation) with the results obtained from inquiries, a
     reading of such general accounting records and other procedures specified
     in such letter and have found such dollar amounts and other financial
     information to be in agreement with such results, except as otherwise
     specified in such letter.

          (d)  The Purchasers shall have received a letter, dated as of the date
of this Agreement, of Netherland, Sewell & Associates, Inc., independent
petroleum consultants for the Company, in the form and substance satisfactory to
counsel for the Purchasers.

          (e)  Subsequent to the execution and delivery of this Agreement, there
shall not have occurred (i) any change, or any development or event involving a
prospective change, in the condition (financial or other), business, properties
or results of operations of the Company and its subsidiaries taken as one
enterprise which, in the judgment of CSFBC, is material and adverse and makes it
impractical or inadvisable to proceed with completion of the offering or the
sale of and payment for the Offered Securities; (ii) any downgrading in the
rating of any debt securities of the Company by any "nationally recognized
statistical rating organization" (as defined for purposes of Rule 436(g) under
the Securities Act), or any public announcement that any such organization has
under surveillance or review its rating of any debt securities of the Company
(other than an announcement with positive implications of a possible upgrading,
and no stated implication of a possible downgrading, of such rating); (iii) any
material suspension or material limitation of trading in securities generally on
the New York Stock Exchange or any setting of minimum prices for trading on such
exchange, or any suspension of trading of any securities of the Company on any
exchange or in the over-the-counter market; (iv) any banking moratorium declared
by U.S. Federal or New York authorities; or (v) any outbreak or escalation of
major hostilities in which the United States is involved, any declaration of war
by Congress or any other substantial national or international calamity or
emergency if, in the judgment of a majority in interest of the Purchasers
including CSFBC, the effect of any such outbreak, escalation, declaration,
calamity or emergency makes it impractical or inadvisable to proceed with
completion of the offering or sale of and payment for the Offered Securities.

          (f)  The Purchasers shall have received an opinion, dated the Closing
Date, of Thompson & Knight L.L.P., counsel for the Company, that:

               (i)  Each of the Company and the Guarantors and each Significant
          Subsidiary has been duly incorporated or organized, as the case may
          be, and is an existing entity in good standing under the laws of the
          jurisdiction of its respective incorporation or organization, with
          corporate or partnership or limited liability company power and
          authority to own its properties and conduct its business as described
          in the Offering Document; and each of the Company and the Guarantors
          is duly qualified to do business as a foreign corporation, limited
          partnership or limited liability company in good standing in all other
          jurisdictions in which its ownership or lease of property or the
          conduct of its business requires such qualification; except where the
          failure to so qualify would not have a Material Adverse Effect and
          except for the qualification of the Issuers in the jurisdictions noted
          on Exhibit A, which those Issuers are in the process of filing;

                                      -11-
<PAGE>

               (ii)    The Indenture has been duly authorized, executed and
          delivered by each of the Issuers; the Notes and the Guarantees have
          been duly authorized, executed, issued and delivered by the Company
          and each of the Guarantors, respectively, and conform to the
          description thereof contained in the Offering Document; assuming due
          authorization, execution and delivery of the Indenture by the Trustee
          and due authentication of the Notes by the Trustee, the Indenture and
          the Notes constitute valid and legally binding obligations of the
          Company, enforceable in accordance with their terms, subject to
          bankruptcy, insolvency, fraudulent transfer, reorganization,
          moratorium and similar laws of the general applicability relating to
          or affecting creditors' rights and to general equity principles; and,
          assuming due authorization, execution and delivery of the Indenture by
          the Trustee, the Indenture and the Guarantees constitute valid and
          legally binding obligations of each of the Guarantors, enforceable in
          accordance with their terms, subject to bankruptcy, insolvency,
          fraudulent transfer, reorganization, moratorium and similar laws of
          general applicability relating to or affecting creditors' rights and
          to general equity principles;

               (iii)   None of the Issuers is or, after giving effect to the
          offering and sale of the Offered Securities and the application of the
          proceeds thereof as described in the Offering Circular, will be an
          "investment company" as defined in the Investment Company Act of 1940;

               (iv)    No consent, approval, authorization or order of, or
          filing with, any governmental agency or body or any court is required
          for the consummation of the transactions contemplated by this
          Agreement and the Registration Rights Agreement in connection with the
          issuance or sale of the Offered Securities by the Issuers, except such
          as may be required under state or foreign securities laws and except
          for the order of the Commission declaring the Exchange Offer
          Registration Statement or the Shelf Registration Statement effective;

               (v)     To the knowledge of such counsel, except for certain
          listed litigation, there are no pending actions, suits or proceedings
          against or affecting the Company, any of its subsidiaries or any of
          their respective properties that, if determined adversely to the
          Company or any of its subsidiaries, would individually or in the
          aggregate have a Material Adverse Effect, or would materially and
          adversely affect the ability of the Issuers to perform their
          respective obligations under the Indenture, this Agreement or the
          Registration Rights Agreement, or which are otherwise material in the
          context of the sale of the Offered Securities; and no such actions,
          suits or proceedings are threatened or contemplated;

               (vi)    The execution, delivery and performance of the Indenture,
          this Agreement and the Registration Rights Agreement by the Company
          and the Guarantors, the issuance, sale and delivery of the Notes and
          the Guarantees by the Company and the Guarantors, respectively, and
          compliance with the terms and provisions thereof will not result in a
          breach or violation of any of the terms and provisions of, or
          constitute a default under, any statute, any rule, regulation or order
          of any governmental agency or body or any court having jurisdiction
          over the Company or any subsidiary of the Company or any of their
          properties, or any agreement or instrument known to such counsel to
          which the Company or any such subsidiary is a party or by which the
          Company or any such subsidiary is bound or to which any of the
          properties of the Company or any such subsidiary is subject, or the
          charter or by-laws (or comparable governing documents) of the Company
          or any such subsidiary;

               (vii)   Each of the Issuers has full power and authority to
          authorize, issue and sell the Offered Securities as contemplated by
          this Agreement;

               (viii)  Such counsel has no reason to believe that the Offering
          Circular, or any amendment or supplement thereto, or any Exchange Act
          Report or any part of a Hallwood Exchange Act Report incorporated by
          reference in the Offering Circular, as of the date hereof and as of
          the Closing Date, contained any untrue statement of a material fact or
          omitted to state any material fact necessary to make the statements
          therein not misleading; the descriptions in the Offering Circular and
          the Exchange Act Reports of contracts and other documents listed in
          such opinion fairly present accurate summaries of such contracts and
          documents, the statements made

                                      -12-
<PAGE>

          under the caption "Description of Notes" insofar as they purport to
          constitute summaries of the terms of the Notes are accurate in all
          material respects; the statements made under the caption "Certain
          United States Federal Tax Consequences", to the extent that they
          constitute summaries of matters of law or regulation or legal
          conclusion, fairly summarize the matters described therein in all
          material respects; it being understood that such counsel need express
          no opinion as to the financial statements or other financial data
          contained in the Offering Circular, the Exchange Act Reports or the
          Hallwood Exchange Act Reports;

               (ix)    This Agreement and the Registration Rights Agreement have
          been duly authorized, executed and delivered by each of the Issuers;
          and

               (x)     It is not necessary in connection with (i) the offer,
          sale and delivery of the Offered Securities by the Issuers to the
          several Purchasers pursuant to this Agreement or (ii) the resales of
          the Offered Securities by the several Purchasers in the manner
          contemplated hereby to register the Offered Securities under the
          Securities Act or to qualify an indenture in respect thereof under the
          Trust Indenture Act.

          In rendering such opinion, such counsel may state that they express no
     opinion as to the laws of any jurisdiction other than the laws of the State
     of Texas, the Delaware General Corporation Law, the Delaware Revised
     Uniform Limited Partnership Act, the Delaware Limited Liability Company
     Act, the General Corporation Law of Nevada, the Nevada laws relating to
     limited liability companies, the federal laws of the United States and,
     only as to the enforceability of the Indenture, the Notes and the
     Guarantees, the laws of the State of New York.  With respect to matters of
     Colorado law, such counsel may rely upon the opinion of local counsel.

          (g)  The Purchasers shall have received from Vinson & Elkins L.L.P.,
     counsel for the Purchasers, such opinion or opinions, dated the Closing
     Date, with respect to the incorporation of the Issuers, the validity of the
     Offered Securities, the Offering Circular, the exemption from registration
     for the offer and sale of the Offered Securities by the Company to the
     several Purchasers and the resales by the several Purchasers as
     contemplated hereby and other related matters as CSFBC may reasonably
     require, and the Company shall have furnished to such counsel such
     documents as they reasonably request for the purpose of enabling them to
     pass upon such matters.

          (h)  The Purchasers shall have received a certificate, dated the
     Closing Date, of the President or any Vice President and a principal
     financial or accounting officer of the Company in which such officers, to
     the best of their knowledge after reasonable investigation, shall state
     that the representations and warranties of the Issuers in this Agreement
     are true and correct, that each of the Issuers has complied in all material
     respects with all agreements and satisfied all conditions on its part to be
     performed or satisfied hereunder at or prior to the Closing Date, and that,
     subsequent to the dates of the most recent financial statements in the
     Offering Document there has been no material adverse change, nor any
     development or event involving a prospective material adverse change, in
     the condition (financial or other), business, properties or results of
     operations of the Company and its subsidiaries taken as a whole except as
     set forth in or contemplated by the Offering Document or as described in
     such certificate.

          (i)  The Purchasers shall have received a letter, dated the Closing
     Date, of KPMG LLP which meets the requirements of subsection (a) of this
     Section, except that the specified date referred to in such subsection will
     be a date not more than three days prior to the Closing Date for the
     purposes of this subsection.

          (j)  The Purchasers shall have received a letter, dated the Closing
     Date, of PricewaterhouseCoopers LLP which meets the requirements of
     subsection (b) of this Section, except that the specified date referred to
     in such subsection will be a date not more than three days prior to the
     Closing Date for the purposes of this subsection.

          (k)  The Purchasers shall have received a letter, dated the Closing
     Date, of Deloitte & Touche LLP which meets the requirements of subsection
     (c) of this Section, except that the specified date referred

                                      -13-
<PAGE>

     to in such subsection will be a date not more than three days prior to the
     Closing Date for the purposes of this subsection.

          (l)  The Purchaser shall have received a letter, dated the Closing
     Date, of Netherland, Sewell & Associates, Inc. confirming the matters
     contained in their letter issued pursuant to subsection (d) of this
     Section.

The Company will furnish the Purchasers with such conformed copies of such
opinions, certificates, letters and documents as the Purchasers reasonably
request. CSFBC may in its sole discretion waive on behalf of the Purchasers
compliance with any conditions to the obligations of the Purchasers hereunder.

     7.   Indemnification and Contribution. (a) Each of the Issuers, jointly and
severally, will indemnify and hold harmless each Purchaser, its partners,
directors and officers and each person, if any, who controls such Purchaser
within the meaning of Section 15 of the Securities Act, against any losses,
claims, damages or liabilities, joint or several, to which such Purchaser may
become subject, under the Securities Act or the Exchange Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged untrue
statement of any material fact contained in the Offering Document, or any
amendment or supplement thereto, or any related preliminary offering circular or
the Exchange Act Reports or arise out of or are based upon the omission or
alleged omission to state therein a material fact necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, including any losses, claims, damages or liabilities arising out
of or based upon the Issuers' failure to perform their obligations under Section
5(a) of this Agreement, and will reimburse each Purchaser for any legal or other
expenses reasonably incurred by such Purchaser in connection with investigating
or defending any such loss, claim, damage, liability or action as such expenses
are incurred; provided, however, that the Issuers will not be liable in any such
case to the extent that any such loss, claim, damage or liability arises out of
or is based upon an untrue statement or alleged untrue statement in or omission
or alleged omission from any of such documents in reliance upon and in
conformity with written information furnished to the Company by any Purchaser
through CSFBC specifically for use therein, it being understood and agreed that
the only such information consists of the information described as such in
subsection (b) below; provided, further, that with respect to any untrue
statement or omission or alleged untrue statement or omission from any
preliminary offering circular, the indemnity agreements contained in this
subsection (a) shall not inure to the benefit of any Purchaser that sold Offered
Securities to the person asserting any such losses, claims, damages or
liabilities to the extent that such sale was an initial resale by such Purchaser
and any such loss, claim, damage or liability of such Purchaser results from the
fact that there were not sent or given to such person, at or prior to the
written confirmation of the sale of such Offered Securities to such person, a
copy of the final offering circular (exclusive of any material included therein
but not attached thereto) if the Issuers had previously furnished copies thereof
to such Purchaser and if the untrue statement or omission or alleged untrue
statement or omission was corrected in such final offering circular.

     (b)  Each Purchaser will severally and not jointly indemnify and hold
harmless the Issuers, their respective directors and officers and each person,
if any, who controls the Issuers within the meaning of Section 15 of the
Securities Act, against any losses, claims, damages or liabilities to which the
Issuers may become subject, under the Securities Act or the Exchange Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in the Offering Document, or any
amendment or supplement thereto, or any related preliminary offering circular,
or arise out of or are based upon the omission or the alleged omission to state
therein a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading, in
each case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in reliance
upon and in conformity with written information furnished to the Company by such
Purchaser through CSFBC specifically for use therein, and will reimburse any
legal or other expenses reasonably incurred by the Company in connection with
investigating or defending any such loss, claim, damage, liability or action as
such expenses are incurred, it being understood and agreed that the only such
information furnished by any Purchaser consists of the following information in
the Offering Document furnished on behalf of each Purchaser: the fifth paragraph
and the second sentence of the eighth paragraph under the caption "Plan of
Distribution"; provided however, that the Purchasers shall not be liable for any
losses, claims, damages or liabilities arising out of or based upon the Issuers'
failure to perform their obligations under Section 5(a) of this Agreement.

                                      -14-
<PAGE>

     (c)  Promptly after receipt by an indemnified party under this Section of
notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under
subsection (a) or (b) above, notify the indemnifying party of the commencement
thereof; but the omission so to notify the indemnifying party will not relieve
it from any liability which it may have to any indemnified party otherwise than
under subsection (a) or (b) above. In case any such action is brought against
any indemnified party and it notifies the indemnifying party of the commencement
thereof, the indemnifying party will be entitled to participate therein and, to
the extent that it may wish, jointly with any other indemnifying party similarly
notified, to assume the defense thereof, with counsel satisfactory to such
indemnified party (who shall not, except with the consent of the indemnified
party, which consent shall not be unreasonably withheld, be counsel to the
indemnifying party), and after notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof, the
indemnifying party will not be liable to such indemnified party under this
Section for any legal or other expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened action in respect of which any indemnified party is or could have
been a party and indemnity could have been sought hereunder by such indemnified
party unless such settlement includes (i) an unconditional release of such
indemnified party from all liability on any claims that are the subject matter
of such action and (ii) does not include a statement as to or an admission of
fault, culpability or failure to act by or on behalf of any indemnified party.

     (d)  If the indemnification provided for in this Section is unavailable or
insufficient to hold harmless an indemnified party under subsection (a) or (b)
above, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities referred to in subsection (a) or (b) above (i) in such proportion as
is appropriate to reflect the relative benefits received by the Company on the
one hand and the Purchasers on the other from the offering of the Offered
Securities or (ii) if the allocation provided by clause (i) above is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits referred to in clause (i) above but also the relative
fault of the Issuers on the one hand and the Purchasers on the other in
connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities as well as any other relevant equitable
considerations. The relative benefits received by the Issuers on the one hand
and the Purchasers on the other shall be deemed to be in the same proportion as
the total net proceeds from the offering (before deducting expenses) received by
the Issuers bear to the total discounts and commissions received by the
Purchasers from the Issuers under this Agreement. The relative fault shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Issuers or the Purchasers
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such untrue statement or omission. The amount
paid by an indemnified party as a result of the losses, claims, damages or
liabilities referred to in the first sentence of this subsection (d) shall be
deemed to include any legal or other expenses reasonably incurred by such
indemnified party in connection with investigating or defending any action or
claim which is the subject of this subsection (d). Notwithstanding the
provisions of this subsection (d), no Purchaser shall be required to contribute
any amount in excess of the amount by which the total price at which the Offered
Securities purchased by it were resold exceeds the amount of any damages which
such Purchaser has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. The Purchasers'
obligations in this subsection (d) to contribute are several in proportion to
their respective purchase obligations and not joint.

     (e)  The obligations of the Issuers under this Section shall be in addition
to any liability which the Issuers may otherwise have and shall extend, upon the
same terms and conditions, to each person, if any, who controls any Purchaser
within the meaning of the Securities Act or the Exchange Act; and the
obligations of the Purchasers under this Section shall be in addition to any
liability which the respective Purchasers may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls the
Issuers within the meaning of the Securities Act or the Exchange Act.

     8.   Default of Purchasers.  If any Purchaser or Purchasers default in
their obligations to purchase the Offered Securities hereunder and the aggregate
principal amount of the Offered Securities that such defaulting Purchaser or
Purchasers agreed but failed to purchase does not exceed 10% of the total
principal amount of the Offered Securities, CSFBC may make arrangements
satisfactory to the Company for the purchase of such Offered Securities by other
persons, including any of the Purchasers, but if no such arrangements are made
by the Closing

                                      -15-
<PAGE>

Date, the non-defaulting Purchasers shall be obligated severally, in proportion
to their respective commitments hereunder, to purchase the Offered Securities
that such defaulting Purchasers agreed but failed to purchase. If any Purchaser
or Purchasers so default and the aggregate principal amount of the Offered
Securities with respect to which such default or defaults occur exceeds 10% of
the total principal amount of the Offered Securities and arrangements
satisfactory to CSFBC and the Company for the purchase of such Offered
Securities by other persons are not made within 36 hours after such default,
this Agreement will terminate without liability on the part of any non-
defaulting Purchaser or the Company, except as provided in Section 9. As used in
this Agreement, the term "Purchaser" includes any person substituted for a
Purchaser under this Section. Nothing herein will relieve a defaulting Purchaser
from liability for its default.

     9.   Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of the
Issuers or their officers and of the several Purchasers set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation, or statement as to the results thereof, made by or on behalf
of any Purchaser, the Issuers or any of their respective representatives,
officers or directors or any controlling person, and will survive delivery of
and payment for the Offered Securities. If this Agreement is terminated pursuant
to Section 8 or if for any reason the purchase of the Offered Securities by the
Purchasers is not consummated, the Issuers shall remain responsible for the
expenses to be paid or reimbursed by it pursuant to Section 5 and the respective
obligations of the Issuers and the Purchasers pursuant to Section 7 shall remain
in effect, but shall not inure to the benefit of any defaulting Purchaser. If
the purchase of the Offered Securities by the Purchasers is not consummated for
any reason other than solely because of the termination of this Agreement
pursuant to Section 8 or the occurrence of any event specified in clause (iii),
(iv) or (v) of Section 6(e), the Issuers will reimburse the Purchasers for all
out-of-pocket expenses (including fees and disbursements of counsel) reasonably
incurred by them in connection with the offering of the Offered Securities.

     10.  Notices. All communications hereunder will be in writing and, if sent
to the Purchasers will be mailed, delivered or sent by facsimile and confirmed
to the Purchasers c/o Credit Suisse First Boston Corporation, Eleven Madison
Avenue, New York, N.Y. 10010-3629, Attention: Transactions Advisory Group, or,
if sent to the Issuers, will be mailed, delivered or telegraphed and confirmed
to it at 500 West Illinois, Midland, Texas 79701, Attention: Jack D. Hightower;
provided, however, that any notice to a Purchaser pursuant to Section 7 will be
mailed, delivered or sent by facsimile and confirmed to such Purchaser.

     11.  Successors. This Agreement will inure to the benefit of and be binding
upon the parties hereto and their respective successors and the controlling
persons referred to in Section 7, and no other person will have any right or
obligation hereunder, except that holders of Offered Securities shall be
entitled to enforce the agreements for their benefit contained in the second and
third sentences of Section 5(b) hereof against the Issuers as if such holders
were parties hereto.

     12.  Representation of Purchasers. CSFBC will act for the several
Purchasers in connection with this purchase, and any action under this Agreement
taken by CSFBC will be binding upon all the Purchasers.

     13.  Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

     14.  Applicable Law. This Agreement shall be governed by, and construed in
accordance with, the laws of the State of New York without regard to principles
of conflicts of laws.

     15.  Execution and Delivery by Certain Parties. This Agreement shall be
deemed executed and delivered by HEP Pure, LP and HEP Pure Acquisition LLC and
any representation or warranty relating to any such entity shall be deemed made
at 11:59 p.m., Eastern Standard Daylight Savings Time, on the date hereof, and
no earlier.

     The Company hereby submits to the non-exclusive jurisdiction of the Federal
and state courts in the Borough of Manhattan in The City of New York in any suit
or proceeding brought by another party to this Agreement arising out of or
relating to this Agreement or the transactions contemplated hereby.

                                      -16-
<PAGE>

          If the foregoing is in accordance with the Purchasers' understanding
     of our agreement, kindly sign and return to the Company one of the
     counterparts hereof, whereupon it will become a binding agreement between
     the Company, the Guarantors and the several Purchasers in accordance with
     its terms.

                                       Very truly yours,

                                       PURE RESOURCES, INC.
                                       TITAN EXPLORATION, INC.
                                       PURE RESOURCES I, INC.
                                       HALLWOOD PETROLEUM, INC.
                                       PURE GP, LLC
                                       HEP PURE ACQUISITION, LLC

                                       By:  /s/ William White
                                          --------------------------------
                                       Name: William K. White
                                       Title: Vice President

                                       PURE RESOURCES HOLDINGS, INC.
                                       PURE RESOURCES HOLDINGS, LLC

                                       By:  /s/ Richard Klumpp
                                          --------------------------------
                                       Name: Richard Klumpp
                                       Title: Vice President

                                       PURE RESOURCES, L.P.
                                       PK I, L.P.
                                       PK II, L.P.
                                       PK III, L.P.
                                       PK IV, L.P.

                                       By: PURE RESOURCES I, INC., its general
                                           partner

                                       By:  /s/ William White
                                          --------------------------------
                                       Name: William K. White
                                       Title: Vice President

                                       HEP PURE, LP

                                       By: PURE GP, LLC, its general partner

                                       By:  /s/ William White
                                          --------------------------------
                                       Name: William K. White
                                       Title: Vice President

                                      -17-
<PAGE>

                                       HALLWOOD ENERGY PARTNERS, L.P.

                                       By: HEP PURE ACQUISITION, LLC,
                                              its general partner

                                       By:  /s/ William White
                                          --------------------------------
                                       Name: William K. White
                                       Title: Vice President

                                       LA PLATA ASSOCIATES, LLC
                                       HALLWOOD LA PLATA LLC

                                       By: HALLWOOD PETROLEUM, INC.
                                              its general partner

                                       By:  /s/ William White
                                          --------------------------------
                                       Name: William K. White
                                       Title: Vice President

                                      -18-
<PAGE>

The foregoing Purchase Agreement is hereby
confirmed and accepted as of the date first above
written.

     Acting on behalf of itself and as the
     Representative of the several Purchasers

CREDIT SUISSE FIRST BOSTON CORPORATION
FIRST UNION SECURITIES, INC.
BNP PARIBAS SECURITIES CORP.
FLEET SECURITIES, INC.
CREDIT LYONNAIS SECURITIES (USA) INC.
BNY CAPITAL MARKETS, INC.
WELLS FARGO BROKERAGE, LLC

     Acting on behalf of themselves and as the
     Representatives of the several Purchasers.

By: CREDIT SUISSE FIRST BOSTON CORPORATION

By: /s/ Timothy Perry
    ---------------------------------
         Timothy Perry
         Director

                                      -19-
<PAGE>

                                  SCHEDULE A

              Purchaser                                      Principal Amount of
              ---------                                      -------------------
                                                             Offered Securities
                                                             ------------------

Credit Suisse First Boston Corporation                          $189,998,000

First Union Securities, Inc.                                      70,000,000

BNP Paribas Securities Corp.                                      30,000,000

Fleet Securities, Inc.                                            25,715,000

Credit Lyonnais Securities (USA) Inc.                             17,143,000

BNY Capital Markets, Inc.                                          8,572,000

Wells Fargo Brokerage, LLC                                         8,572,000

            Total                                               $350,000,000
                                                                ------------

                                      -20-
<PAGE>

                                   Exhibit A
                                   ---------

                           Qualifications in Process

Pure Resources I, Inc.
----------------------

     Louisiana
     New Mexico

Pure GP, LLC
------------

     Texas

     Utah and any other state determined to require qualification by virtue of
     this entity's acting as general partner of HEP Pure, LP

HEP Pure, LP
------------

     Colorado
     Louisiana
     New Mexico
     Texas
     Utah
     Wyoming

HEP Pure Acquisition, LLC
-------------------------

     Colorado
     Louisiana
     New Mexico
     Texas
     Utah
     Wyoming

La Plata Associates, LLC
------------------------

     Texas

Hallwood La Plata, LLC
----------------------

     Texas

                                      -21-

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