CROSS TIMBERS OIL CO
8-A12B, 1998-09-08
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

                                   FORM 8-A

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                   PURSUANT TO SECTION 12(B) OR 12(G) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                           Cross Timbers Oil Company
                           -------------------------
            (Exact Name of Registrant as Specified in Its Charter)
 
               Delaware                                      75-2347769
- ----------------------------------------                     ------------------
(State of Incorporation or Organization)                     (I.R.S. Employer
                                                             Identification no.)
 
810 Houston Street, Suite 2000, Fort                                     
 Worth, Texas                                                76102 
- ----------------------------------------                     -------------------
(Address of Principal Executive Offices)                     (Zip Code)
      
 
If this form relates to the             If this form relates to the
registration of a class of              registration of a class of securities
securities pursuant to Section 12(b)    pursuant to Section 12(g) of the
of the Exchange Act and is effective    Exchange Act and is effective
pursuant to General Instruction         pursuant to General Instruction
A.(c), please check the following       A.(d), please check the following
box. [X]                                box. [ ]

Securities Act registration statement file number to which this form relates:
________ (If applicable) 
 
Securities to be registered pursuant to Section 12(b) of the Act:
 
      Title of Each Class                   Name of Each Exchange on Which
      to be so Registered                   Each Class is to be Registered
      -------------------                   ------------------------------
 
Preferred Stock Purchase Rights         New York Stock Exchange
- --------------------------------------  --------------------------------------

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


Securities to be registered pursuant to Section 12(g) of the Act:


- --------------------------------------------------------------------------------
                                (Title of Class)


- --------------------------------------------------------------------------------
                                (Title of Class)
<PAGE>
 
Item 1. Description of Registrant's Securities to be Registered.
        --------------------------------------------------------

     On August 25, 1998, the Board of Directors of Cross Timbers Oil Company
(the "Company") declared a dividend of one preferred share purchase right (a
"Right") for each outstanding share of common stock, par value $.01 per share,
of the Company (the "Common Stock").  The dividend is payable on September 15,
1998 to stockholders of record on September 15, 1998 (the "Record Date"). Each
Right entitles the registered holder to purchase from the Company one one-
thousandth of a share of Series A Junior Participating Preferred Stock, par
value $.01 per share, of the Company (the "Preferred Stock") at a price of $80
per one one-thousandth of a share of Preferred Stock (the "Purchase Price"),
subject to adjustment.  The description and terms of the Rights are set forth in
a Rights Agreement dated as of August 25, 1998, as the same may be amended from
time to time (the "Rights Agreement"), between the Company and ChaseMellon
Shareholder Services, LLC, as Rights Agent (the "Rights Agent").

          Until the earlier to occur of (i) 10 days following a public
announcement that a person or group of affiliated or associated persons (with
certain exceptions, an "Acquiring Person") has acquired beneficial ownership of
15% or more of the outstanding shares of Common Stock or (ii) 10 business days
(or such later date as may be determined by action of the Board of Directors
prior to such time as any person or group of affiliated persons becomes an
Acquiring Person) following the commencement of, or announcement of an intention
to make, a tender offer or exchange offer the consummation of which would result
in the beneficial ownership by a person or group of 15% or more of the
outstanding shares of Common Stock (the earlier of such dates being called the
"Distribution Date"), the Rights will be evidenced, with respect to any of the
Common Stock certificates outstanding as of the Record Date, by such Common
Stock certificate together with a copy of a Summary of Rights.

          The Rights Agreement provides that, until the Distribution Date (or
earlier expiration of the Rights), the Rights will be transferred with and only
with the Common Stock.  Until the Distribution Date (or earlier expiration of
the Rights), new Common Stock certificates issued after the Record Date upon
transfer or new issuances of Common Stock will contain a notation incorporating
the Rights Agreement by reference.  Until the Distribution Date (or earlier
expiration of the Rights), the surrender for transfer of any certificates for
shares of Common Stock outstanding as of the Record Date, even without such
notation or a copy of a Summary of Rights, will also constitute the transfer of
the Rights associated with the shares of Common Stock represented by such
certificate.  As soon as practicable following the Distribution Date, separate
certificates evidencing the Rights ("Right Certificates") will be mailed to
holders of record of the Common Stock as of the close of business on the
Distribution Date and such separate Right Certificates alone will evidence the
Rights.

          The Rights are not exercisable until the Distribution Date.  The
Rights will expire on August 25, 2008 (the "Final Expiration Date"), unless the
Final Expiration Date is advanced or extended or unless the Rights are earlier
redeemed or exchanged by the Company, in each case as described below.

          The Purchase Price payable, and the number of shares of Preferred
Stock or other securities or property issuable, upon exercise of the Rights is
subject to adjustment from time to time to prevent dilution (i) in the event of
a stock dividend on, or a subdivision, combination or reclassification of, the
Preferred Stock, (ii) upon the grant to holders of the Preferred Stock of
certain 

                                  Page 2 of 5
<PAGE>
 
rights or warrants to subscribe for or purchase Preferred Stock at a price, or
securities convertible into Preferred Stock with a conversion price, less than
the then-current market price of the Preferred Stock or (iii) upon the
distribution to holders of the Preferred Stock of evidences of indebtedness or
assets (excluding regular periodic cash dividends or dividends payable in
Preferred Stock) or of subscription rights or warrants (other than those
referred to above).

          The number of outstanding Rights is subject to adjustment in the event
of a stock dividend on the Common Stock payable in shares of Common Stock or
subdivisions, consolidations or combinations of the Common Stock occurring, in
any such case, prior to the Distribution Date.

          Shares of Preferred Stock purchasable upon exercise of the Rights will
not be redeemable.  Each share of Preferred Stock will be entitled, when, as and
if declared, to a minimum preferential quarterly dividend payment of $10 per
share but will be entitled to an aggregate dividend of 1000 times the dividend
declared per share of Common Stock.  In the event of liquidation, dissolution or
winding up of the Company, the holders of the Preferred Stock will be entitled
to a minimum preferential payment of $10 per share (plus any accrued but unpaid
dividends) but will be entitled to an aggregate payment of 1000 times the
payment made per share of Common Stock.  Each share of Preferred Stock will have
1000 votes, voting together with the Common Stock.  Finally, in the event of any
merger, consolidation or other transaction in which outstanding shares of Common
Stock are converted or exchanged, each share of Preferred Stock will be entitled
to receive 1000 times the amount received per share of Common Stock.  These
rights are protected by customary antidilution provisions.

          Because of the nature of the Preferred Stock's dividend, liquidation
and voting rights, the value of the one one-thousandth interest in a share of
Preferred Stock purchasable upon exercise of each Right should approximate the
value of one share of Common Stock.

          In the event that any person or group of affiliated or associated
persons becomes an Acquiring Person, each holder of a Right, other than Rights
beneficially owned by the Acquiring Person (which will thereupon become void),
will thereafter have the right to receive upon exercise of a Right that number
of shares of Common Stock having a market value of two times the exercise price
of the Right.

          In the event that, after a person or group has become an Acquiring
Person, the Company is acquired in a merger or other business combination
transaction or 50% or more of its consolidated assets or earning power are sold,
proper provisions will be made so that each holder of a Right (other than Rights
beneficially owned by an Acquiring Person which will have become void) will
thereafter have the right to receive upon the exercise of a Right that number of
shares of common stock of the person with whom the Company has engaged in the
foregoing transaction (or its parent) that at the time of such transaction have
a market value of two times the exercise price of the Right.

          At any time after any person or group becomes an Acquiring Person and
prior to the earlier of one of the events described in the previous paragraph or
the acquisition by such Acquiring Person of 50% or more of the outstanding
shares of Common Stock, the Board of Directors of the Company may exchange the
Rights (other than Rights owned by such Acquiring Person which will 

                                  Page 3 of 5
<PAGE>
 
have become void), in whole or in part, for shares of Common Stock or Preferred
Stock (or a series of the Company's preferred stock having equivalent rights,
preferences and privileges), at an exchange ratio of one share of Common Stock,
or a fractional share of Preferred Stock (or other preferred stock) equivalent
in value thereto, per Right.

          With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.  No fractional shares of Preferred Stock or Common Stock
will be issued (other than fractions of Preferred Stock which are integral
multiples of one one-thousandth of a share of Preferred Stock, which may, at the
election of the Company, be evidenced by depositary receipts), and in lieu
thereof an adjustment in cash will be made based on the current market price of
the Preferred Stock or the Common Stock.

          At any time prior to the time an Acquiring Person becomes such, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $.01 per Right (the "Redemption Price"), payable, at the
option of the Company, in cash, shares of Common Stock or such other form of
consideration as the Board of Directors of the Company shall determine.  The
redemption of the Rights may be made effective at such time, on such basis and
with such conditions as the Board of Directors in their sole discretion may
establish.  Immediately upon any redemption of the Rights, the right to exercise
the Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.

          For so long as the Rights are then redeemable, the Company may, except
with respect to the Redemption Price, amend the Rights Agreement in any manner.
After the Rights are no longer redeemable, the Company may, except with respect
to the Redemption Price, amend the Rights Agreement in any manner that does not
adversely affect the interests of holders of the Rights.

          Until a Right is exercised or exchanged, the holder thereof, as such,
will have no rights as a stockholder of the Company, including, without
limitation, the right to vote or receive dividends.

          The form of Rights Agreement between the Company and the Rights Agent
specifying the terms of the Rights, which includes as Exhibit A the form of
Certificate of Designations of Series A Junior Participating Preferred Stock of
the Company, as Exhibit B the form of Right Certificate and as Exhibit C the
form of Summary of Rights to Purchase Preferred Stock, and a press release
issued by the Company on August 26, 1998 with respect to the Rights, are
attached hereto as exhibits and incorporated herein by reference.  The foregoing
description of the Rights is qualified by reference to such exhibits.

                                  Page 4 of 5
<PAGE>
 
Item 2. Exhibits.
        -------- 

     4.1  Rights Agreement, dated August 25, 1998, between Cross Timbers Oil
          Company and ChaseMellon Shareholder Services, LLC, as Rights Agent,
          together with the following exhibits thereto: Exhibit A-Form of
          Certificate of Designation of Series A Junior Participating Preferred
          Stock of Cross Timbers Oil Company; Exhibit B-Form of Right
          Certificate; Exhibit C-Summary of Rights to Purchase Shares of
          Preferred Stock of Cross Timbers Oil Company.

     99.1 Press Release, dated August 26, 1998.

                                  Page 5 of 5

<PAGE>
 
                                                                     EXHIBIT 4.1



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


                           CROSS TIMBERS OIL COMPANY

                                      and

             CHASEMELLON SHAREHOLDER SERVICES, LLC, as Rights Agent


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

                                RIGHTS AGREEMENT

                          Dated as of August 25, 1998

                        -------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------

                                                                            Page
                                                                            ----
Section 1.     Certain Definitions..........................................   1
 
Section 2.     Appointment of Rights Agent..................................   5
 
Section 3.     Issue of Right Certificates..................................   5
 
Section 4.     Form of Right Certificates...................................   7
 
Section 5.     Countersignature and Registration............................   7
 
Section 6.     Transfer, Split Up, Combination and Exchange of Right
               Certificates; Mutilated, Destroyed, Lost or Stolen Right
               Certificates.................................................   8
 
Section 7.     Exercise of Rights, Purchase Price; Expiration Date of 
               Rights.......................................................   8
 
Section 8.     Cancellation and Destruction of Right Certificates...........  10
 
Section 9.     Availability of Shares of Preferred Stock....................  10
 
Section 10.    Preferred Stock Record Date..................................  11
 
Section 11.    Adjustment of Purchase Price, Number of Shares and Number
               of Rights....................................................  11
 
Section 12.    Certificate of Adjusted Purchase Price or Number of Shares...  19
 
Section 13.    Consolidation, Merger or Sale or Transfer of Assets or
               Earning Power................................................  19
 
Section 14.    Fractional Rights and Fractional Shares......................  22
 
Section 15.    Rights of Action.............................................  23
 
Section 16.    Agreement of Right Holders...................................  24
 
Section 17.    Right Certificate Holder Not Deemed a Stockholder............  24
 
Section 18.    Concerning the Rights Agent..................................  24
 
Section 19.    Merger or Consolidation or Change of Name of Rights Agent....  25
 
Section 20.    Duties of Rights Agent.......................................  25


<PAGE>
 
Section 21.    Change of Rights Agent.......................................  27
 
Section 22.    Issuance of New Right Certificates...........................  28
 
Section 23.    Redemption...................................................  28
 
Section 24.    Exchange.....................................................  29
 
Section 25.    Notice of Certain Events.....................................  30
 
Section 26.    Notices......................................................  31
 
Section 27.    Supplements and Amendments...................................  31
 
Section 28.    Successors...................................................  32
 
Section 29.    Benefits of this Agreement...................................  32
 
Section 30.    Determinations and Actions by the Board of Directors.........  32
 
Section 31.    Severability.................................................  32
 
Section 32.    Governing Law................................................  32
 
Section 33.    Counterparts.................................................  33
 
Section 34.    Descriptive Headings.........................................  33


<PAGE>
 
                               RIGHTS AGREEMENT
                               ----------------


        Rights Agreement, dated as of August 25, 1998 ("Agreement"), between
Cross Timbers Oil Company, a Delaware corporation (the "Company"), and
ChaseMellon Shareholder Services, LLC, as Rights Agent (the "Rights Agent").

        The Board of Directors of the Company has authorized and declared a
dividend of one preferred share purchase right (a "Right") for each share of
Common Stock (as hereinafter defined) of the Company outstanding as of the Close
of Business (as defined below) on September 15, 1998 (the "Record Date"), each
Right representing the right to purchase one one-thousandth (subject to
adjustment) of a share of Preferred Stock (as hereinafter defined), upon the
terms and subject to the conditions herein set forth, and has further authorized
and directed the issuance of one Right (subject to adjustment as provided
herein) with respect to each share of Common Stock that shall become outstanding
between the Record Date and the earlier of the Distribution Date and the
Expiration Date (as such terms are hereinafter defined); provided, however, that
Rights may be issued with respect to shares of Common Stock that shall become
outstanding after the Distribution Date and prior to the Expiration Date in
accordance with Section 22.

        Accordingly, in consideration of the premises and the mutual agreements
herein set forth, the parties hereby agree as follows:

        Section 1.  Certain Definitions.  For purposes of this Agreement, the
following terms have the meaning indicated:

        (a) "Acquiring Person" shall mean any Person (as such term is
hereinafter defined) who or which shall be the Beneficial Owner (as such term is
hereinafter defined) of 15% or more of the shares of Common Stock then
outstanding, but shall not include an Exempt Person (as such term is hereinafter
defined); provided, however, that (i) if the Board of Directors of the Company
determines in good faith that a Person who would otherwise be an "Acquiring
Person" inadvertently became the Beneficial Owner of a number of shares of
Common Stock such that the Person would otherwise qualify as an "Acquiring
Person" (including, without limitation, because (A) such Person was unaware that
it beneficially owned a percentage of Common Stock that would otherwise cause
such Person to be an "Acquiring Person" or (B) such Person was aware of the
extent of its Beneficial Ownership of Common Stock but had no actual knowledge
of the consequences of such Beneficial Ownership under this Agreement) and
without any intention of changing or influencing control of the Company, then
such Person shall not be deemed to be or to have become an "Acquiring Person"
for any purposes of this Agreement unless and until such Person shall have
failed to divest itself, as soon as practicable (as determined, in good faith,
by the Board of the Company), of Beneficial Ownership of a sufficient number of
shares of Common Stock so that such Person would no longer otherwise qualify as
an "Acquiring Person"; (ii) if, as of the date hereof or prior to the first
public announcement of the adoption of this Agreement, any Person is or becomes
the Beneficial Owner of 15% or more of the shares of Common Stock outstanding,
such Person

                                       1
<PAGE>
 
shall not be deemed to be or to become an "Acquiring Person" unless and until
such time as such Person shall, after the first public announcement of the
adoption of this Agreement, become the Beneficial Owner of additional shares of
Common Stock (other than pursuant to a dividend or distribution paid or made by
the Company on the outstanding Common Stock or pursuant to a split or
subdivision of the outstanding Common Stock), unless, upon becoming the
Beneficial Owner of such additional shares of Common Stock, such Person is not
then the Beneficial Owner of 15% or more of the shares of Common Stock then
outstanding; and (iii) no Person shall become an "Acquiring Person" as the
result of an acquisition of shares of Common Stock by the Company which, by
reducing the number of shares outstanding, increases the proportionate number of
shares of Common Stock beneficially owned by such Person to 15% or more of the
shares of Common Stock then outstanding, provided, however, that if a Person
shall become the Beneficial Owner of 15% or more of the shares of Common Stock
then outstanding by reason of such share acquisitions by the Company and shall
thereafter become the Beneficial Owner of any additional shares of Common Stock
(other than pursuant to a dividend or distribution paid or made by the Company
on the outstanding Common Stock or pursuant to a split or subdivision of the
outstanding Common Stock), then such Person shall be deemed to be an "Acquiring
Person" unless upon becoming the Beneficial Owner of such additional shares of
Common Stock such Person does not beneficially own 15% or more of the shares of
Common Stock then outstanding.  For all purposes of this Agreement, any
calculation of the number of shares of Common Stock outstanding at any
particular time, including for purposes of determining the particular percentage
of such outstanding shares of Common Stock of which any Person is the Beneficial
Owner, shall be made in accordance with the last sentence of Rule 13d-3(d)(1)(i)
of the General Rules and Regulations under the Securities Exchange Act of 1934,
as amended (the "Exchange Act"), as in effect on the date hereof.

        (b) "Affiliate" and "Associate" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Exchange Act, as in effect on the date hereof.

        (c) A Person shall be deemed the "Beneficial Owner" of, shall be deemed
to have "Beneficial Ownership" of and shall be deemed to "beneficially own" any
securities:

            (i)   which such Person or any of such Person's Affiliates or
Associates is deemed to beneficially own, directly or indirectly, within the
meaning of Rule l3d-3 of the General Rules and Regulations under the Exchange
Act as in effect on the date hereof;

            (ii)  which such Person or any of such Person's Affiliates or
Associates has (A) the right to acquire (whether such right is exercisable
immediately or only after the passage of time) pursuant to any agreement,
arrangement or understanding (other than customary agreements with and between
underwriters and selling group members with respect to a bona fide public
offering of securities), or upon the exercise of conversion rights, exchange
rights, rights, warrants or options, or otherwise; provided, however, that a
Person shall not be deemed the Beneficial Owner of, or to beneficially own, (x)
securities tendered pursuant to a tender or exchange offer made by or on behalf
of such Person or any of such Person's Affiliates

                                       2
<PAGE>
 
or Associates until such tendered securities are accepted for purchase, (y)
securities which such Person has a right to acquire upon the exercise of Rights
at any time prior to the time that any Person becomes an Acquiring Person or (z)
securities issuable upon the exercise of Rights from and after the time that any
Person becomes an Acquiring Person if such Rights were acquired by such Person
or any of such Person's Affiliates or Associates prior to the Distribution Date
or pursuant to Section 3(a) or Section 22 hereof ("Original Rights") or pursuant
to Section 11(i) or Section 11(n) with respect to an adjustment to Original
Rights; or (B) the right to vote pursuant to any agreement, arrangement or
understanding; provided, however, that a Person shall not be deemed the
Beneficial Owner of, or to beneficially own, any security by reason of such
agreement, arrangement or understanding if the agreement, arrangement or
understanding to vote such security (1) arises solely from a revocable proxy or
consent given to such Person in response to a public proxy or consent
solicitation made pursuant to, and in accordance with, the applicable rules and
regulations promulgated under the Exchange Act and (2) is not also then
reportable on Schedule 13D under the Exchange Act (or any comparable or
successor report); or

            (iii) which are beneficially owned, directly or indirectly, by
any other Person and with respect to which such Person or any of such Person's
Affiliates or Associates has any agreement, arrangement or understanding (other
than customary agreements with and between underwriters and selling group
members with respect to a bona fide public offering of securities) for the
purpose of acquiring, holding, voting (except to the extent contemplated by the
proviso to Section 1(c)(ii)(B)) or disposing of such securities of the Company;

provided, however, that no Person who is an officer, director or employee of an
Exempt Person shall be deemed, solely by reason of such Person's status or
authority as such, to be the "Beneficial Owner" of, to have "Beneficial
Ownership" of or to "beneficially own" any securities that are "beneficially
owned" (as defined in this Section l(c)), including, without limitation, in a
fiduciary capacity, by an Exempt Person or by any other such officer, director
or employee of an Exempt Person.

        (d) "Business Day" shall mean any day other than a Saturday, a Sunday or
a day on which banking institutions in the State of New York or the city in
which the principal office of the Rights Agent is located are authorized or
obligated by law or executive order to close.

        (e) "Close of Business" on any given date shall mean 5:00 P.M., New York
City time, on such date; provided, however, that if such date is not a Business
Day it shall mean 5:00 P.M., New York City time, on the next succeeding Business
Day.

        (f) "Common Stock" when used with reference to the Company shall mean
the Common Stock, presently par value $.01 per share, of the Company.  "Common
Stock" when used with reference to any Person other than the Company shall mean
the common stock (or, in the case of an unincorporated entity, the equivalent
equity interest) with the greatest voting power of such other Person or, if such
other Person is a subsidiary of another Person, the Person or Persons which
ultimately control such first-mentioned Person.

                                       3
<PAGE>
 
        (g)  "Common Stock Equivalents" shall have the meaning set forth in
Section 11(a)(iii) hereof.

        (h)  "Current Value" shall have the meaning set forth in Section
11(a)(iii) hereof.

        (i)  "Distribution Date" shall have the meaning set forth in Section 3
hereof.

        (j)  "equivalent preferred shares" shall have the meaning set forth in
Section 11(b) hereof.

        (k)  "Exempt Person" shall mean the Company or any Subsidiary (as such
term is hereinafter defined) of the Company, in each case including, without
limitation, in its fiduciary capacity, or any employee benefit plan of the
Company or of any Subsidiary of the Company, or any entity or trustee holding
Common Stock for or pursuant to the terms of any such plan or for the purpose of
funding any such plan or funding other employee benefits for employees of the
Company or of any Subsidiary of the Company.

        (l)  "Exchange Ratio" shall have the meaning set forth in Section 24
hereof.

        (m)  "Expiration Date" shall have the meaning set forth in Section 7
hereof.

        (n)  "Flip-In Event" shall have the meaning set forth in Section
11(a)(ii) hereof.

        (o)  "Final Expiration Date" shall have the meaning set forth in Section
7 hereof.

        (p)  "NASDAQ" shall mean The Nasdaq Stock Market.

        (q)  "New York Stock Exchange" shall mean the New York Stock Exchange,
Inc.

        (r)  "Person" shall mean any individual, firm, corporation, partnership,
limited liability company, trust or other entity, and shall include any
successor (by merger or otherwise) to such entity.

        (s)  "Preferred Stock" shall mean the Series A Junior Participating
Preferred Stock, par value $.01 per share, of the Company having the rights and
preferences set forth in the Form of Certificate of Designation attached to this
Agreement as Exhibit A.

        (t)  "Principal Party" shall have the meaning set forth in Section 13(b)
hereof.

        (u)  "Redemption Date" shall have the meaning set forth in Section 7
hereof.

        (v)  "Redemption Price" shall have the meaning set forth in Section 23
hereof.

                                       4
<PAGE>
 
        (w)  "Right Certificate" shall have the meaning set forth in Section 3
hereof.

        (x)  "Securities Act" shall mean the Securities Act of 1933, as amended.

        (y)  "Section 11(a)(ii) Trigger Date" shall have the meaning set forth
in Section 11(a)(iii) hereof.

        (z)  "Spread" shall have the meaning set forth in Section 11(a)(iii)
hereof.

        (aa) "Stock Acquisition Date" shall mean the first date of public
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to Section 13(d) of the Exchange Act) by the
Company or an Acquiring Person that an Acquiring Person has become such, or such
earlier date as a majority of the Board of Directors shall become aware of the
existence of an Acquiring Person.

        (bb) "Subsidiary" of any Person shall mean any corporation or other
entity of which securities or other ownership interests having ordinary voting
power sufficient to elect a majority of the board of directors or other persons
performing similar functions are beneficially owned, directly or indirectly, by
such Person, and any corporation or other entity that is otherwise controlled by
such Person.

        (cc) "Substitution Period" shall have the meaning set forth in Section
11(a)(iii) hereof.

        (dd) "Summary of Rights" shall have the meaning set forth in Section 3
hereof.

        (ee) "Trading Day" shall have the meaning set forth in Section 11(d)(i)
hereof.

        Section 2.  Appointment of Rights Agent.  The Company hereby appoints
the Rights Agent to act as agent for the Company in accordance with the terms
and conditions hereof, and the Rights Agent hereby accepts such appointment.
The Company may from time to time appoint such co-Rights Agents as it may deem
necessary or desirable.

        Section 3.  Issue of Right Certificates.

        (a) Until the Close of Business on the earlier of (i) the tenth day
after the Stock Acquisition Date or (ii) the tenth Business Day (or such later
date as may be determined by action of the Board of Directors prior to such time
as any Person becomes an Acquiring Person) after the date of the commencement by
any Person (other than an Exempt Person) of, or of the first public announcement
of the intention of such Person (other than an Exempt Person) to commence, a
tender or exchange offer the consummation of which would result in any Person
(other than an Exempt Person) becoming the Beneficial Owner of shares of Common
Stock aggregating 15% or more of the Common Stock then outstanding (the earlier
of such dates being herein referred to as the "Distribution Date", provided,
however, that if either of such dates occurs after the date of this Agreement
and on or prior to the Record Date,

                                       5
<PAGE>
 
then the Distribution Date shall be the Record Date), (x) the Rights will be
evidenced (subject to the provisions of Section 3(b) hereof) by the certificates
for Common Stock registered in the names of the holders thereof and not by
separate Right Certificates, and (y) the Rights will be transferable only in
connection with the transfer of Common Stock.  As soon as practicable after the
Distribution Date, the Company will prepare and execute, the Rights Agent will
countersign and the Company will send or cause to be sent (and the Rights Agent
will, if requested, send) by first-class, insured, postage-prepaid mail, to each
record holder of Common Stock as of the close of business on the Distribution
Date (other than any Acquiring Person or any Associate or Affiliate of an
Acquiring Person), at the address of such holder shown on the records of the
Company, a Right Certificate, in substantially the form of Exhibit B hereto (a
"Right Certificate"), evidencing one Right (subject to adjustment as provided
herein) for each share of Common Stock so held.  As of the Distribution Date,
the Rights will be evidenced solely by such Right Certificates.

        (b) On the Record Date, or as soon as practicable thereafter, the
Company will send a copy of a Summary of Rights to Purchase Shares of Preferred
Stock, in substantially the form of Exhibit C hereto (the "Summary of Rights"),
by first-class, postage-prepaid mail, to each record holder of Common Stock as
of the Close of Business on the Record Date (other than any Acquiring Person or
any Associate or Affiliate of any Acquiring Person), at the address of such
holder shown on the records of the Company.  With respect to certificates for
Common Stock outstanding as of the Record Date, until the Distribution Date, the
Rights will be evidenced by such certificates registered in the names of the
holders thereof together with the Summary of Rights.  Until the Distribution
Date (or, if earlier, the Expiration Date), the surrender for transfer of any
certificate for Common Stock outstanding on the Record Date, with or without a
copy of the Summary of Rights, shall also constitute the transfer of the Rights
associated with the Common Stock represented thereby.

        (c) Rights shall be issued in respect of all shares of Common Stock
issued or disposed of (including, without limitation, upon disposition of Common
Stock out of treasury stock or issuance or reissuance of Common Stock out of
authorized but unissued shares) after the Record Date but prior to the earlier
of the Distribution Date and the Expiration Date, or in certain circumstances
provided in Section 22 hereof, after the Distribution Date.  Certificates issued
for Common Stock (including, without limitation, upon transfer of outstanding
Common Stock, disposition of Common Stock out of treasury stock or issuance or
reissuance of Common Stock out of authorized but unissued shares) after the
Record Date but prior to the earlier of the Distribution Date and the Expiration
Date, or in certain circumstances provided in Section 22 hereof, after the
Distribution Date shall have impressed on, printed on, written on or otherwise
affixed to them the following legend:

          This certificate also evidences and entitles the holder hereof to
          certain rights as set forth in a Rights Agreement between Cross
          Timbers Oil Company (the "Company") and ChaseMellon Shareholder
          Services, LLC, as Rights Agent, dated as of August 25, 1998 and as
          amended from time to time (the "Rights Agreement"), the terms of which
          are hereby incorporated herein by 

                                       6
<PAGE>
 
          reference and a copy of which is on file at the principal executive
          offices of the Company.  Under certain circumstances, as set forth in
          the Rights Agreement, such Rights will be evidenced by separate
          certificates and will no longer be evidenced by this certificate.  The
          Company will mail to the holder of this certificate a copy of the
          Rights Agreement without charge after receipt of a written request
          therefor. Under certain circumstances, as set forth in the Rights
          Agreement, Rights owned by or transferred to any Person who is or
          becomes an Acquiring Person (as defined in the Rights Agreement) and
          certain transferees thereof will become null and void and will no
          longer be transferable.

With respect to such certificates containing the foregoing legend, until the
Distribution Date the Rights associated with the Common Stock represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate, except as otherwise provided
herein, shall also constitute the transfer of the Rights associated with the
Common Stock represented thereby.  In the event that the Company purchases or
otherwise acquires any Common Stock after the Record Date but prior to the
Distribution Date, any Rights associated with such Common Stock shall be deemed
canceled and retired so that the Company shall not be entitled to exercise any
Rights associated with the Common Stock which are no longer outstanding.

        Notwithstanding this paragraph (c), the omission of a legend shall not
affect the enforceability of any part of this Agreement or the rights of any
holder of the Rights.

        Section 4.  Form of Right Certificates.  The Right Certificates (and the
forms of election to purchase shares and of assignment to be printed on the
reverse thereof) shall be substantially in the form set forth in Exhibit B
hereto and may have such marks of identification or designation and such
legends, summaries or endorsements printed thereon as the Company may deem
appropriate and as are not inconsistent with the provisions of this Agreement,
or as may be required to comply with any applicable law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any stock
exchange or interdealer quotation system on which the Rights may from time to
time be listed or quoted, or to conform to usage. Subject to the provisions of
this Agreement, the Right Certificates shall entitle the holders thereof to
purchase such number of one one-thousandths of a share of Preferred Stock as
shall be set forth therein at the price per one one-thousandth of a share of
Preferred Stock set forth therein (the "Purchase Price"), but the number of such
one one-thousandths of a share of Preferred Stock and the Purchase Price shall
be subject to adjustment as provided herein.

        Section 5.  Countersignature and Registration.

        (a) The Right Certificates shall be executed on behalf of the Company by
the President of the Company, either manually or by facsimile signature, shall
have affixed thereto the Company's seal or a facsimile thereof and shall be
attested by the Secretary of the Company, either manually or by facsimile
signature.  The Right Certificates shall be manually 

                                       7
<PAGE>
 
countersigned by the Rights Agent and shall not be valid for any purpose unless
countersigned. In case any officer of the Company who shall have signed any of
the Right Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Right Certificates, nevertheless, may be countersigned by the Rights Agent
and issued and delivered by the Company with the same force and effect as though
the Person who signed such Right Certificates had not ceased to be such officer
of the Company; and any Right Certificate may be signed on behalf of the Company
by any Person who, at the actual date of the execution of such Right
Certificate, shall be a proper officer of the Company to sign such Right
Certificate, although at the date of the execution of this Agreement any such
Person was not such an officer.

        (b) Following the Distribution Date, the Rights Agent will keep or cause
to be kept, at an office or agency designated for such purpose, books for
registration and transfer of the Right Certificates issued hereunder.  Such
books shall show the names and addresses of the respective holders of the Right
Certificates, the number of Rights evidenced on its face by each of the Right
Certificates and the date of each of the Right Certificates.

        Section 6.  Transfer, Split Up, Combination and Exchange of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates.

        (a) Subject to the provisions of this Agreement, at any time after the
Distribution Date and prior to the Expiration Date, any Right Certificate or
Right Certificates may be transferred, split up, combined or exchanged for
another Right Certificate or Right Certificates, entitling the registered holder
to purchase a like number of one one-thousandths of a share of Preferred Stock
as the Right Certificate or Right Certificates surrendered then entitled such
holder to purchase.  Any registered holder desiring to transfer, split up,
combine or exchange any Right Certificate or Right Certificates shall make such
request in writing delivered to the Rights Agent, and shall surrender the Right
Certificate or Right Certificates to be transferred, split up, combined or
exchanged at the office or agency of the Rights Agent designated for such
purpose.  Thereupon the Rights Agent shall countersign and deliver to the Person
entitled thereto a Right Certificate or Right Certificates, as the case may be,
as so requested.  The Company may require payment of a sum sufficient to cover
any tax or governmental charge that may be imposed in connection with any
transfer, split up, combination or exchange of Right Certificates.

        (b) Subject to the provisions of this Agreement, at any time after the
Distribution Date and prior to the Expiration Date, upon receipt by the Company
and the Rights Agent of evidence reasonably satisfactory to them of the loss,
theft, destruction or mutilation of a Right Certificate, and, in case of loss,
theft or destruction, of indemnity or security reasonably satisfactory to them,
and, at the Company's request, reimbursement to the Company and the Rights Agent
of all reasonable expenses incidental thereto, and upon surrender to the Rights
Agent and cancellation of the Right Certificate if mutilated, the Company will
make and deliver a new Right Certificate of like tenor to the Rights Agent for
delivery to the registered holder in lieu of the Right Certificate so lost,
stolen, destroyed or mutilated.

                                       8
<PAGE>
 
        Section 7.  Exercise of Rights, Purchase Price; Expiration Date of
Rights.

        (a) Except as otherwise provided herein, the Rights shall become
exercisable on the Distribution Date, and thereafter the registered holder of
any Right Certificate may, subject to Section 11(a)(ii) hereof and except as
otherwise provided herein, exercise the Rights evidenced thereby in whole or in
part upon surrender of the Right Certificate, with the form of election to
purchase on the reverse side thereof duly executed, to the Rights Agent at the
office or agency of the Rights Agent designated for such purpose, together with
payment of the aggregate Purchase Price with respect to the total number of one
one-thousandths of a share of Preferred Stock (or other securities, cash or
other assets, as the case may be) as to which the Rights are exercised, at any
time which is both after the Distribution Date and prior to the time (the
"Expiration Date") that is the earliest of (i) the Close of Business on August
25, 2008 (the "Final Expiration Date"), (ii) the time at which the Rights are
redeemed as provided in Section 23 hereof (the "Redemption Date") or (iii) the
time at which such Rights are exchanged as provided in Section 24 hereof.

        (b) The Purchase Price shall be initially $80.00 for each one one-
thousandth of a share of Preferred Stock purchasable upon the exercise of a
Right.  The Purchase Price and the number of one one-thousandths of a share of
Preferred Stock or other securities or property to be acquired upon exercise of
a Right shall be subject to adjustment from time to time as provided in Sections
11 and 13 hereof and shall be payable in lawful money of the United States of
America in accordance with paragraph (c) of this Section 7.

        (c) Except as otherwise provided herein, upon receipt of a Right
Certificate representing exercisable Rights, with the form of election to
purchase duly executed, accompanied by payment of the aggregate Purchase Price
for the shares of Preferred Stock to be purchased and an amount equal to any
applicable transfer tax required to be paid by the holder of such Right
Certificate in accordance with Section 9 hereof, in cash or by certified check,
cashier's check or money order payable to the order of the Company, the Rights
Agent shall thereupon promptly (i) (A) requisition from any transfer agent of
the Preferred Stock, or made available if the Rights Agent is the transfer agent
for the Preferred Stock, certificates for the number of shares of Preferred
Stock to be purchased, and the Company hereby irrevocably authorizes its
transfer agent to comply with all such requests, or (B) requisition from a
depositary agent appointed by the Company depositary receipts representing
interests in such number of one one-thousandths of a share of Preferred Stock as
are to be purchased (in which case certificates for the Preferred Stock
represented by such receipts shall be deposited by the transfer agent with the
depositary agent), and the Company hereby directs any such depositary agent to
comply with such request, (ii) when appropriate, requisition from the Company
the amount of cash to be paid in lieu of issuance of fractional shares in
accordance with Section 14 hereof, (iii) promptly after receipt of such
certificates or depositary receipts, cause the same to be delivered to or upon
the order of the registered holder of such Right Certificate, registered in such
name or names as may be designated by such holder and (iv) when appropriate,
after receipt, promptly deliver such cash to or upon the order of the registered
holder of such Right Certificate.

                                       9
<PAGE>
 
        (d) Except as otherwise provided herein, in case the registered holder
of any Right Certificate shall exercise less than all of the Rights evidenced
thereby, a new Right Certificate evidencing Rights equivalent to the exercisable
Rights remaining unexercised shall be issued by the Rights Agent to the
registered holder of such Right Certificate or to his duly authorized assigns,
subject to the provisions of Section 14 hereof.

        (e) Notwithstanding anything in this Agreement to the contrary, neither
the Rights Agent nor the Company shall be obligated to undertake any action with
respect to a registered holder of Rights upon the occurrence of any purported
transfer or exercise of Rights pursuant to Section 6 hereof or this Section 7
unless such registered holder shall have (i) completed and signed the
certificate contained in the form of assignment or form of election to purchase
set forth on the reverse side of the Rights Certificate surrendered for such
transfer or exercise and (ii) provided such additional evidence of the identity
of the Beneficial Owner (or former Beneficial Owner) thereof as the Company
shall reasonably request.

        Section 8.  Cancellation and Destruction of Right Certificates.  All
Right Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Right
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement.  The Company shall deliver to the
Rights Agent for cancellation and retirement, and the Rights Agent shall so
cancel and retire, any other Right Certificate purchased or acquired by the
Company otherwise than upon the exercise thereof. The Rights Agent shall deliver
all canceled Right Certificates to the Company, or shall, at the written request
of the Company, destroy such canceled Right Certificates, and in such case shall
deliver a certificate of destruction thereof to the Company.

        Section 9.  Availability of Shares of Preferred Stock.

        (a) The Company covenants and agrees that it will cause to be reserved
and kept available out of its authorized and unissued shares of Preferred Stock
or any shares of Preferred Stock held in its treasury, the number of shares of
Preferred Stock that will be sufficient to permit the exercise in full of all
outstanding Rights.

        (b) So long as the shares of Preferred Stock issuable upon the exercise
of Rights may be listed or admitted to trading on any national securities
exchange, or quoted on NASDAQ, the Company shall use its best efforts to cause,
from and after such time as the Rights become exercisable, all shares reserved
for such issuance to be listed or admitted to trading on such exchange, or
quoted on NASDAQ, upon official notice of issuance upon such exercise.

        (c) From and after such time as the Rights become exercisable, the
Company shall use its best efforts, if then necessary to permit the issuance of
shares of Preferred Stock upon the exercise of Rights, to file a registration
statement and qualify such shares of Preferred Stock under the Securities Act
and any applicable state securities or "Blue Sky" laws (to the

                                       10
<PAGE>
 
extent exemptions therefrom are not available), cause such registration
statement and qualifications to become effective as soon as possible after such
filing and keep such registration and qualifications effective until the earlier
of the date as of which the Rights are no longer exercisable for such securities
and the Expiration Date.  The Company may temporarily suspend, for a period of
time not to exceed 90 days, the exercisability of the Rights in order to prepare
and file a registration statement under the Securities Act and permit it to
become effective.  Upon any such suspension, the Company shall issue a public
announcement stating that the exercisability of the Rights has been temporarily
suspended, as well as a public announcement at such time as the suspension is no
longer in effect.  Notwithstanding any provision of this Agreement to the
contrary, the Rights shall not be exercisable in any jurisdiction unless the
requisite qualification in such jurisdiction shall have been obtained and until
a registration statement under the Securities Act shall have been declared
effective, unless an exemption therefrom is available.

        (d) The Company covenants and agrees that it will take all such action
as may be necessary to ensure that all shares of Preferred Stock delivered upon
exercise of Rights shall, at the time of delivery of the certificates therefor
(subject to payment of the Purchase Price), be duly and validly authorized and
issued and fully paid and nonassessable shares.

        (e) The Company further covenants and agrees that it will pay when due
and payable any and all federal and state transfer taxes and charges which may
be payable in respect of the issuance or delivery of the Right Certificates or
of any shares of Preferred Stock upon the exercise of Rights.  The Company shall
not, however, be required to pay any transfer tax which may be payable in
respect of any transfer or delivery of Right Certificates to a Person other
than, or the issuance or delivery of certificates or depositary receipts for the
Preferred Stock in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or deliver
any certificates or depositary receipts for Preferred Stock upon the exercise of
any Rights until any such tax shall have been paid (any such tax being payable
by that holder of such Right Certificate at the time of surrender) or until it
has been established to the Company's reasonable satisfaction that no such tax
is due.

        Section 10.  Preferred Stock Record Date.  Each Person in whose name any
certificate for Preferred Stock is issued upon the exercise of Rights shall for
all purposes be deemed to have become the holder of record of the shares of
Preferred Stock represented thereby on, and such certificate shall be dated, the
date upon which the Right Certificate evidencing such Rights was duly
surrendered and payment of the Purchase Price (and any applicable transfer
taxes) was made; provided, however, that if the date of such surrender and
payment is a date upon which the Preferred Stock transfer books of the Company
are closed, such Person shall be deemed to have become the record holder of such
shares on, and such certificate shall be dated, the next succeeding Business Day
on which the Preferred Stock transfer books of the Company are open.  Prior to
the exercise of the Rights evidenced thereby, the holder of a Right Certificate
shall not be entitled to any rights of a holder of Preferred Stock for which the
Rights shall be exercisable, including, without limitation, the right to vote or
to receive dividends or other distributions, and shall not be entitled to
receive any notice of any proceedings of the Company, except as provided herein.

                                       11
<PAGE>
 
        Section 11.  Adjustment of Purchase Price, Number and Kind of Shares and
Number of Rights.  The Purchase Price, the number of shares of Preferred Stock
or other securities or property purchasable upon exercise of each Right and the
number of Rights outstanding are subject to adjustment from time to time as
provided in this Section 11.

        (a)(i)  In the event the Company shall at any time after the date of
this Agreement (A) declare and pay a dividend on the Preferred Stock payable in
shares of Preferred Stock, (B) subdivide the outstanding Preferred Stock, (C)
combine the outstanding Preferred Stock into a smaller number of shares of
Preferred Stock or (D) issue any shares of its capital stock in a
reclassification of the Preferred Stock (including any such reclassification in
connection with a consolidation or merger in which the Company is the continuing
or surviving corporation), except as otherwise provided in this Section 11(a),
the Purchase Price in effect at the time of the record date for such dividend or
of the effective date of such subdivision, combination or reclassification, and
the number and kind of shares of capital stock issuable on such date, shall be
proportionately adjusted so that the holder of any Right exercised after such
time shall be entitled to receive the aggregate number and kind of shares of
capital stock which, if such Right had been exercised immediately prior to such
date and at a time when the Preferred Stock transfer books of the Company were
open, the holder would have owned upon such exercise and been entitled to
receive by virtue of such dividend, subdivision, combination or
reclassification; provided, however, that in no event shall the consideration to
be paid upon the exercise of one Right be less than the aggregate par value of
the shares of capital stock of the Company issuable upon exercise of one Right.

        (ii) Subject to Section 24 of this Agreement, in the event any Person
becomes an Acquiring Person (the first occurrence of such event being referred
to hereinafter as the "Flip-In Event"), then (A) the Purchase Price shall be
adjusted to be the Purchase Price in effect immediately prior to the Flip-In
Event multiplied by the number of one one-thousandths of a share of Preferred
Stock for which a Right was exercisable immediately prior to such Flip-In Event,
whether or not such Right was then exercisable, and (B) each holder of a Right,
except as otherwise provided in this Section 11(a)(ii) and Section 11(a)(iii)
hereof, shall thereafter have the right to receive, upon exercise thereof at a
price equal to the Purchase Price (as so adjusted), in accordance with the terms
of this Agreement and in lieu of shares of Preferred Stock, such number of
shares of Common Stock as shall equal the result obtained by dividing the
Purchase Price (as so adjusted) by 50% of the current per share market price of
the Common Stock (determined pursuant to Section 11(d) hereof) on the date of
such Flip-In Event; provided, however, that the Purchase Price (as so adjusted)
and the number of shares of Common Stock so receivable upon exercise of a Right
shall, following the Flip-In Event, be subject to further adjustment as
appropriate in accordance with Section 11(f) hereof. Notwithstanding anything in
this Agreement to the contrary, however, from and after the Flip-In Event, any
Rights that are beneficially owned by (x) any Acquiring Person (or any Affiliate
or Associate of any Acquiring Person), (y) a transferee of any Acquiring Person
(or any such Affiliate or Associate) who becomes a transferee after the Flip-In
Event or (z) a transferee of any Acquiring Person (or any such Affiliate or
Associate) who became a transferee prior to or concurrently with the Flip-In
Event pursuant to either (I) a transfer from the Acquiring Person to holders of
its equity securities or to any Person with whom it has any continuing
agreement,

                                       12
<PAGE>
 
arrangement or understanding regarding the transferred Rights or (II) a transfer
which the Board of Directors has determined is part of a plan, arrangement or
understanding which has the purpose or effect of avoiding the provisions of this
paragraph, and subsequent transferees of such Persons, shall be void without any
further action and any holder of such Rights shall thereafter have no rights
whatsoever with respect to such Rights under any provision of this Agreement.
The Company shall use all reasonable efforts to ensure that the provisions of
this Section 11(a)(ii) are complied with, but shall have no liability to any
holder of Right Certificates or other Person as a result of its failure to make
any determinations with respect to an Acquiring Person or its Affiliates,
Associates or transferees hereunder.  From and after the Flip-In Event, no Right
Certificate shall be issued pursuant to Section 3 or Section 6 hereof that
represents Rights that are or have become void pursuant to the provisions of
this paragraph, and any Right Certificate delivered to the Rights Agent that
represents Rights that are or have become void pursuant to the provisions of
this paragraph shall be canceled.  From and after the occurrence of an event
specified in Section 13(a) hereof, any Rights that theretofore have not been
exercised pursuant to this Section 11(a)(ii) shall thereafter be exercisable
only in accordance with Section 13 and not pursuant to this Section 11(a)(ii).

        (iii) The Company may at its option substitute for a share of Common
Stock issuable upon the exercise of Rights in accordance with the foregoing
subparagraph (ii) a number of shares of Preferred Stock or fraction thereof such
that the current per share market price of one share of Preferred Stock
multiplied by such number or fraction is equal to the current per share market
price of one share of Common Stock.  In the event that there shall not be
sufficient shares of Common Stock issued but not outstanding or authorized but
unissued to permit the exercise in full of the Rights in accordance with the
foregoing subparagraph (ii), the Board of Directors shall, to the extent
permitted by applicable law and any material agreements then in effect to which
the Company is a party (A) determine the excess (such excess, the "Spread") of
(1) the value of the shares of Common Stock issuable upon the exercise of a
Right in accordance with the foregoing subparagraph (ii) (the "Current Value")
over (2) the Purchase Price (as adjusted in accordance with the foregoing
subparagraph (ii)), and (B) with respect to each Right (other than Rights which
have become void pursuant to the foregoing subparagraph (ii)), make adequate
provision to substitute for the shares of Common Stock issuable in accordance
with the foregoing subparagraph (ii) upon exercise of the Right and payment of
the Purchase Price (as adjusted in accordance therewith), (1) cash, (2) a
reduction in such Purchase Price, (3) shares of Preferred Stock or other equity
securities of the Company (including, without limitation, shares or fractions of
shares of preferred stock which, by virtue of having dividend, voting and
liquidation rights substantially comparable to those of the shares of Common
Stock, are deemed in good faith by the Board of Directors to have substantially
the same value as the shares of Common Stock (such shares of Preferred Stock and
shares or fractions of shares of preferred stock are hereinafter referred to as
"Common Stock Equivalents")), (4) debt securities of the Company, (5) other
assets, or (6) any combination of the foregoing, having a value which, when
added to the value of the shares of Common Stock issued upon exercise of such
Right, shall have an aggregate value equal to the Current Value (less the amount
of any reduction in such Purchase Price), where such aggregate value has been
determined by the Board of Directors upon the advice of a nationally recognized
investment banking firm selected in good faith by the Board of Directors;
provided, however,

                                       13
<PAGE>
 
that if the Company shall not make adequate provision to deliver value pursuant
to clause (B) above within thirty (30) days following the Flip-In Event (the
"Section 11(a) (ii) Trigger Date"), then the Company shall be obligated to
deliver, to the extent permitted by applicable law and any material agreements
then in effect to which the Company is a party, upon the surrender for exercise
of a Right and without requiring payment of such Purchase Price, shares of
Common Stock (to the extent available), and then, if necessary, such number or
fractions of shares of Preferred Stock (to the extent available) and then, if
necessary, cash, which shares and/or cash have an aggregate value equal to the
Spread.  If, upon the occurrence of the Flip-In Event, the Board of Directors
shall determine in good faith that it is likely that sufficient additional
shares of Common Stock could be authorized for issuance upon exercise in full of
the Rights, then, if the Board of Directors so elects, the thirty (30) day
period set forth above may be extended to the extent necessary, but not more
than ninety (90) days after the Section 11(a) (ii) Trigger Date, in order that
the Company may seek stockholder approval for the authorization of such
additional shares (such thirty (30) day period, as it may be extended, is herein
called the "Substitution Period").  To the extent that the Company determines
that some action need be taken pursuant to the second and/or third sentence of
this Section 11(a)(iii), the Company (x) shall provide, subject to Section
11(a)(ii) hereof and the last sentence of this Section 11(a)(iii) hereof, that
such action shall apply uniformly to all outstanding Rights and (y) may suspend
the exercisability of the Rights until the expiration of the Substitution Period
in order to seek any authorization of additional shares and/or to decide the
appropriate form of distribution to be made pursuant to such second sentence and
to determine the value thereof. In the event of any such suspension, the Company
shall issue a public announcement stating that the exercisability of the Rights
has been temporarily suspended, as well as a public announcement at such time as
the suspension is no longer in effect.  For purposes of this Section 11(a)(iii),
the value of the shares of Common Stock shall be the current per share market
price (as determined pursuant to Section 11(d)(i)) on the Section 11(a)(ii)
Trigger Date and the per share or fractional value of any "Common Stock
Equivalent" shall be deemed to equal the current per share market price of the
Common Stock.  The Board of Directors of the Company may, but shall not be
required to, establish procedures to allocate the right to receive shares of
Common Stock upon the exercise of the Rights among holders of Rights pursuant to
this Section 11(a)(iii).

        (b) In case the Company shall fix a record date for the issuance of
rights, options or warrants to all holders of Preferred Stock entitling them
(for a period expiring within 45 calendar days after such record date) to
subscribe for or purchase Preferred Stock (or shares having the same rights,
privileges and preferences as the Preferred Stock ("equivalent preferred
shares")) or securities convertible into Preferred Stock or equivalent preferred
shares at a price per share of Preferred Stock or equivalent preferred shares
(or having a conversion price per share, if a security convertible into shares
of Preferred Stock or equivalent preferred shares) less than the then current
per share market price of the Preferred Stock (determined pursuant to Section
11(d) hereof) on such record date, the Purchase Price to be in effect after such
record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the number of shares of Preferred Stock and equivalent preferred shares
outstanding on such record date plus the number of shares of Preferred Stock and
equivalent preferred shares which the aggregate

                                       14
<PAGE>
 
offering price of the total number of shares of Preferred Stock and/or
equivalent preferred shares so to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price, and the denominator of which shall be the number
of shares of Preferred Stock and equivalent preferred shares outstanding on such
record date plus the number of additional shares of Preferred Stock and/or
equivalent preferred shares to be offered for subscription or purchase (or into
which the convertible securities so to be offered are initially convertible);
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company issuable upon exercise of one Right.  In case such
subscription price may be paid in a consideration part or all of which shall be
in a form other than cash, the value of such consideration shall be as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent.
Shares of Preferred Stock and equivalent preferred shares owned by or held for
the account of the Company shall not be deemed outstanding for the purpose of
any such computation.  Such adjustment shall be made successively whenever such
a record date is fixed; and in the event that such rights, options or warrants
are not so issued, the Purchase Price shall be adjusted to be the Purchase Price
which would then be in effect if such record date had not been fixed.

        (c) In case the Company shall fix a record date for the making of a
distribution to all holders of the Preferred Stock (including any such
distribution made in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation) of evidences of indebtedness
or assets (other than a regular quarterly cash dividend or a dividend payable in
Preferred Stock) or subscription rights or warrants (excluding those referred to
in Section 11(b) hereof), the Purchase Price to be in effect after such record
date shall be determined by multiplying the Purchase Price in effect immediately
prior to such record date by a fraction, the numerator of which shall be the
then current per share market price of the Preferred Stock (determined pursuant
to Section 11(d) hereof) on such record date, less the fair market value (as
determined in good faith by the Board of Directors of the Company whose
determination shall be described in a statement filed with the Rights Agent) of
the portion of the assets or evidences of indebtedness so to be distributed or
of such subscription rights or warrants applicable to one share of Preferred
Stock, and the denominator of which shall be such current per share market price
(determined pursuant to Section 11(d) hereof) of the Preferred Stock; provided,
however, that in no event shall the consideration to be paid upon the exercise
of one Right be less than the aggregate par value of the shares of capital stock
of the Company to be issued upon exercise of one Right.  Such adjustments shall
be made successively whenever such a record date is fixed; and in the event that
such distribution is not so made, the Purchase Price shall again be adjusted to
be the Purchase Price which would then be in effect if such record date had not
been fixed.

        (d)(i) Except as otherwise provided herein, for the purpose of any
computation hereunder, the "current per share market price " of any security (a
"Security " for the purpose of this Section 11(d)(i)) on any date shall be
deemed to be the average of the daily closing prices per share of such Security
for the 30 consecutive Trading Days (as such term is hereinafter defined)
immediately prior to such date; provided, however, that in the event that

                                       15
<PAGE>
 
the current per share market price of the Security is determined during a period
following the announcement by the issuer of such Security of (A) a dividend or
distribution on such Security payable in shares of such Security or securities
convertible into such shares, or (B) any subdivision, combination or
reclassification of such Security, and prior to the expiration of 30 Trading
Days after the ex-dividend date for such dividend or distribution, or the record
date for such subdivision, combination or reclassification, then, and in each
such case, the current per share market price shall be appropriately adjusted to
reflect the current market price per share equivalent of such Security.  The
closing price for each day shall be the last sale price, regular way, or, in
case no such sale takes place on such day, the average of the closing bid and
asked prices, regular way, in either case as reported by the principal
consolidated transaction reporting system with respect to securities listed or
admitted to trading on the New York Stock Exchange or, if the Security is not
listed or admitted to trading on the New York Stock Exchange, as reported in the
principal consolidated transaction reporting system with respect to securities
listed on the principal national securities exchange on which the Security is
listed or admitted to trading or, if the Security is not listed or admitted to
trading on any national securities exchange, the last quoted price or, if not so
quoted, the average of the high bid and low asked prices in the over-the-counter
market, as reported by NASDAQ or such other system then in use, or, if on any
such date the Security is not quoted by any such organization, the average of
the closing bid and asked prices as furnished by a professional market maker
making a market in the Security selected by the Board of Directors of the
Company.  The term "Trading Day" shall mean a day on which the principal
national securities exchange on which the Security is listed or admitted to
trading is open for the transaction of business or, if the Security is not
listed or admitted to trading on any national securities exchange, a Business
Day.

        (ii) For the purpose of any computation hereunder, if the Preferred
Stock is publicly traded, the "current per share market price" of the Preferred
Stock shall be determined in accordance with the method set forth in Section
11(d)(i).  If the Preferred Stock is not publicly traded but the Common Stock is
publicly traded, the "current per share market price" of the Preferred Stock
shall be conclusively deemed to be the current per share market price of the
Common Stock as determined pursuant to Section 11(d)(i) multiplied by the then
applicable Adjustment Number (as defined in and determined in accordance with
the Certificate of Designation for the Preferred Stock).  If neither the Common
Stock nor the Preferred Stock is publicly traded, "current per share market
price" shall mean the fair value per share as determined in good faith by the
Board of Directors of the Company, whose determination shall be described in a
statement filed with the Rights Agent.

        (e) No adjustment in the Purchase Price shall be required unless such
adjustment would require an increase or decrease of at least 1% in the Purchase
Price; provided, however, that any adjustments which by reason of this Section
11(e) are not required to be made shall be carried forward and taken into
account in any subsequent adjustment.  All calculations under this Section 11
shall be made to the nearest cent or to the nearest one hundred-thousandth of a
share of Preferred Stock or one-hundredth of a share of Common Stock or other
share or security as the case may be.  Notwithstanding the first sentence of
this Section 11(e), any adjustment required by this Section 11 shall be made no
later than the earlier

                                       16
<PAGE>
 
of (i) three years from the date of the transaction which requires such
adjustment or (ii) the Expiration Date.

        (f) If as a result of an adjustment made pursuant to Section 11(a)
hereof, the holder of any Right thereafter exercised shall become entitled to
receive any shares of capital stock of the Company other than the Preferred
Stock, thereafter the Purchase Price and the number of such other shares so
receivable upon exercise of a Right shall be subject to adjustment from time to
time in a manner and on terms as nearly equivalent as practicable to the
provisions with respect to the Preferred Stock contained in Sections 11(a),
11(b), 11(c), 11(e), 11(h), 11(i) and 11(m) hereof, as applicable, and the
provisions of Sections 7, 9, 10, 13 and 14 hereof with respect to the Preferred
Stock shall apply on like terms to any such other shares.

        (g) All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of one one-thousandths of a
share of Preferred Stock purchasable from time to time hereunder upon exercise
of the Rights, all subject to further adjustment as provided herein.

        (h) Unless the Company shall have exercised its election as provided in
Section 11(i), upon each adjustment of the Purchase Price as a result of the
calculations made in Sections 11(b) and 11(c), each Right outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right to purchase, at the adjusted Purchase Price, that number of one one-
thousandths of a share of Preferred Stock (calculated to the nearest one
hundred-thousandth of a share of Preferred Stock) obtained by (i) multiplying
(x) the number of one one-thousandths of a share purchasable upon the exercise
of a Right immediately prior to such adjustment by (y) the Purchase Price in
effect immediately prior to such adjustment and (ii) dividing the product so
obtained by the Purchase Price in effect immediately after such adjustment.

        (i) The Company may elect on or after the date of any adjustment of the
Purchase Price pursuant to Sections 11(b) or 11(c) hereof to adjust the number
of Rights, in substitution for any adjustment in the number of one one-
thousandths of a share of Preferred Stock purchasable upon the exercise of a
Right.  Each of the Rights outstanding after such adjustment of the number of
Rights shall be exercisable for the number of one one-thousandths of a share of
Preferred Stock for which a Right was exercisable immediately prior to such
adjustment.  Each Right held of record prior to such adjustment of the number of
Rights shall become that number of Rights (calculated to the nearest one-
hundredth) obtained by dividing the Purchase Price in effect immediately prior
to adjustment of the Purchase Price by the Purchase Price in effect immediately
after adjustment of the Purchase Price.  The Company shall make a public
announcement of its election to adjust the number of Rights, indicating the
record date for the adjustment, and, if known at the time, the amount of the
adjustment to be made.  Such record date may be the date on which the Purchase
Price is adjusted or any day thereafter, but, if the Right Certificates have
been issued, shall be at least 10 days later than the date of the public
announcement.  If Right Certificates have been issued, upon each adjustment

                                       17
<PAGE>
 
of the number of Rights pursuant to this Section 11(i), the Company may, as
promptly as practicable, cause to be distributed to holders of record of Right
Certificates on such record date Right Certificates evidencing, subject to
Section 14 hereof, the additional Rights to which such holders shall be entitled
as a result of such adjustment, or, at the option of the Company, shall cause to
be distributed to such holders of record in substitution and replacement for the
Right Certificates held by such holders prior to the date of adjustment, and
upon surrender thereof, if required by the Company, new Right Certificates
evidencing all the Rights to which such holders shall be entitled after such
adjustment.  Right Certificates so to be distributed shall be issued, executed
and countersigned in the manner provided for herein and shall be registered in
the names of the holders of record of Right Certificates on the record date
specified in the public announcement.

        (j) Irrespective of any adjustment or change in the Purchase Price or
the number of one one-thousandths of a share of Preferred Stock issuable upon
the exercise of a Right, the Right Certificates theretofore and thereafter
issued may continue to express the Purchase Price and the number of one one-
thousandths of a share of Preferred Stock which were expressed in the initial
Right Certificates issued hereunder.

        (k) Before taking any action that would cause an adjustment reducing the
Purchase Price below the then par value, if any, of the fraction of Preferred
Stock or other shares of capital stock issuable upon exercise of a Right, the
Company shall take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Company may validly and legally issue
fully paid and nonassessable shares of Preferred Stock or other such shares at
such adjusted Purchase Price.

        (l) In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event issuing to the holder of any Right exercised after such record date the
Preferred Stock and other capital stock or securities of the Company, if any,
issuable upon such exercise over and above the Preferred Stock and other capital
stock or securities of the Company, if any, issuable upon such exercise on the
basis of the Purchase Price in effect prior to such adjustment; provided,
however, that the Company shall deliver to such holder a due bill or other
appropriate instrument evidencing such holder's right to receive such additional
shares upon the occurrence of the event requiring such adjustment.

        (m) Anything in this Section 11 to the contrary notwithstanding, the
Company shall be entitled to make such adjustments in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that it in its sole discretion shall determine to be advisable in
order that any consolidation or subdivision of the Preferred Stock, issuance
wholly for cash of any shares of Preferred Stock at less than the current market
price, issuance wholly for cash of Preferred Stock or securities which by their
terms are convertible into or exchangeable for Preferred Stock, dividends on
Preferred Stock payable in shares of Preferred Stock or issuance of rights,
options or warrants referred to hereinabove in Section 11(b), hereafter made by
the Company to holders of its Preferred Stock shall not be taxable to such
stockholders.

                                       18
<PAGE>
 
        (n) Anything in this Agreement to the contrary notwithstanding, in the
event that at any time after the date of this Rights Agreement and prior to the
Distribution Date, the Company shall (i) declare and pay any dividend on the
Common Stock payable in Common Stock or (ii) effect a subdivision, combination
or consolidation of the Common Stock (by reclassification or otherwise than by
payment of a dividend payable in Common Stock) into a greater or lesser number
of shares of Common Stock, then, in each such case, the number of Rights
associated with each share of Common Stock then outstanding, or issued or
delivered thereafter, shall be proportionately adjusted so that the number of
Rights thereafter associated with each share of Common Stock following any such
event shall equal the result obtained by multiplying the number of Rights
associated with each share of Common Stock immediately prior to such event by a
fraction the numerator of which shall be the total number of shares of Common
Stock outstanding immediately prior to the occurrence of the event and the
denominator of which shall be the total number of shares of Common Stock
outstanding immediately following the occurrence of such event.

        (o) The Company agrees that, after the earlier of the Distribution Date
or the Stock Acquisition Date, it will not, except as permitted by Sections 23,
24 or 27 hereof, take (or permit any Subsidiary to take) any action if at the
time such action is taken it is reasonably foreseeable that such action will
diminish substantially or eliminate the benefits intended to be afforded by the
Rights.

        Section 12.  Certificate of Adjusted Purchase Price or Number of Shares.
Whenever an adjustment is made as provided in Section 11 or 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment,
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Common Stock and the
Preferred Stock a copy of such certificate and (c) mail a brief summary thereof
to each holder of a Right Certificate in accordance with Section 25 hereof (if
so required under Section 25 hereof).  The Rights Agent shall be fully protected
in relying on any such certificate and on any adjustment therein contained and
shall not be deemed to have knowledge of any such adjustment unless and until it
shall have received such certificate.

        Section 13.  Consolidation, Merger or Sale or Transfer of Assets or
Earning Power.

        (a) In the event, directly or indirectly, at any time after the Flip-In
Event (i) the Company shall consolidate with or shall merge into any other
Person, (ii) any Person shall merge with and into the Company and the Company
shall be the continuing or surviving corporation of such merger and, in
connection with such merger, all or part of the Common Stock shall be changed
into or exchanged for stock or other securities of any other Person (or of the
Company) or cash or any other property, or (iii) the Company shall sell or
otherwise transfer (or one or more of its Subsidiaries shall sell or otherwise
transfer), in one or more transactions, assets or earning power aggregating 50%
or more of the assets or earning power of the Company and its Subsidiaries
(taken as a whole) to any other Person (other than the Company or one or more
wholly-owned Subsidiaries of the Company), then upon the first

                                       19
<PAGE>
 
occurrence of such event, proper provision shall be made so that: (A) each
holder of a Right (other than Rights which have become void pursuant to Section
11(a)(ii) hereof) shall thereafter have the right to receive, upon the exercise
thereof at the Purchase Price (as theretofore adjusted in accordance with
Section 11(a)(ii) hereof), in accordance with the terms of this Agreement and in
lieu of shares of Preferred Stock or Common Stock of the Company, such number of
validly authorized and issued, fully paid, non-assessable and freely tradeable
shares of Common Stock of the Principal Party (as such term is hereinafter
defined), not subject to any liens, encumbrances, rights of first refusal or
other adverse claims, as shall equal the result obtained by dividing the
Purchase Price (as theretofore adjusted in accordance with Section 11(a)(ii)
hereof) by 50% of the current per share market price of the Common Stock of such
Principal Party (determined pursuant to Section 11(d) hereof) on the date of
consummation of such consolidation, merger, sale or transfer; provided, however,
that the Purchase Price (as theretofore adjusted in accordance with Section
11(a)(ii) hereof) and the number of shares of Common Stock of such Principal
Party so receivable upon exercise of a Right shall be subject to further
adjustment as appropriate in accordance with Section 11(f) hereof to reflect any
events occurring in respect of the Common Stock of such Principal Party after
the occurrence of such consolidation, merger, sale or transfer; (B) such
Principal Party shall thereafter be liable for, and shall assume, by virtue of
such consolidation, merger, sale or transfer, all the obligations and duties of
the Company pursuant to the Agreement; (C) the term "Company" shall thereafter
be deemed to refer to such Principal Party; and (D) such Principal Party shall
take such steps (including, but not limited to, the reservation of a sufficient
number of its shares of Common Stock in accordance with Section 9 hereof) in
connection with such consummation of any such transaction as may be necessary to
assure that the provisions hereof shall thereafter be applicable, as nearly as
reasonably may be, in relation to the shares of its Common Stock thereafter
deliverable upon the exercise of the Rights; provided that, upon the subsequent
occurrence of any consolidation, merger, sale or transfer of assets or other
extraordinary transaction in respect of such Principal Party, each holder of a
Right shall thereupon be entitled to receive, upon exercise of a Right and
payment of the Purchase Price as provided in this Section 13(a), such cash,
shares, rights, warrants and other property which such holder would have been
entitled to receive had such holder, at the time of such transaction, owned the
Common Stock of the Principal Party receivable upon the exercise of a Right
pursuant to this Section 13(a), and such Principal Party shall take such steps
(including, but not limited to, reservation of shares of stock) as may be
necessary to permit the subsequent exercise of the Rights in accordance with the
terms hereof for such cash, shares, rights, warrants and other property.

        (b) "Principal Party" shall mean:

            (i) in the case of any transaction described in (i) or (ii) of the
first sentence of Section 13(a) hereof: (A) the Person that is the issuer of the
securities into which the shares of Common Stock are converted in such merger or
consolidation, or, if there is more than one such issuer, the issuer the shares
of Common Stock of which have the greatest aggregate market value of shares
outstanding, or (B) if no securities are so issued, (x) the Person that is the
other party to the merger, if such Person survives said merger, or, if there is
more than one such Person, the Person the shares of Common Stock of which have
the greatest

                                       20
<PAGE>
 
aggregate market value of shares outstanding or (y) if the Person that is the
other party to the merger does not survive the merger, the Person that does
survive the merger (including the Company if it survives) or (z) the Person
resulting from the consolidation; and

            (ii)  in the case of any transaction described in (iii) of the first
sentence of Section 13(a) hereof, the Person that is the party receiving the
greatest portion of the assets or earning power transferred pursuant to such
transaction or transactions, or, if each Person that is a party to such
transaction or transactions receives the same portion of the assets or earning
power so transferred or if the Person receiving the greatest portion of the
assets or earning power cannot be determined, whichever of such Persons is the
issuer of Common Stock having the greatest aggregate market value of shares
outstanding;

provided, however, that in any such case described in the foregoing clause
(b)(i) or (b)(ii), if the Common Stock of such Person is not at such time or has
not been continuously over the preceding 12-month period registered under
Section 12 of the Exchange Act, then (1) if such Person is a direct or indirect
Subsidiary of another Person the Common Stock of which is and has been so
registered, the term "Principal Party" shall refer to such other Person, or (2)
if such Person is a Subsidiary, directly or indirectly, of more than one Person,
the Common Stock of all of which is and has been so registered, the term
"Principal Party" shall refer to whichever of such Persons is the issuer of
Common Stock having the greatest aggregate market value of shares outstanding,
or (3) if such Person is owned, directly or indirectly, by a joint venture
formed by two or more Persons that are not owned, directly or indirectly, by the
same Person, the rules set forth in clauses (1) and (2) above shall apply to
each of the owners having an interest in the venture as if the Person owned by
the joint venture was a Subsidiary of both or all of such joint venturers, and
the Principal Party in each such case shall bear the obligations set forth in
this Section 13 in the same ratio as its interest in such Person bears to the
total of such interests.

        (c) The Company shall not consummate any consolidation, merger, sale or
transfer referred to in Section 13(a) hereof unless prior thereto the Company
and the Principal Party involved therein shall have executed and delivered to
the Rights Agent an agreement confirming that the requirements of Sections 13(a)
and (b) hereof shall promptly be performed in accordance with their terms and
that such consolidation, merger, sale or transfer of assets shall not result in
a default by the Principal Party under this Agreement as the same shall have
been assumed by the Principal Party pursuant to Sections 13(a) and (b) hereof
and providing that, as soon as practicable after executing such agreement
pursuant to this Section 13, the Principal Party will:

            (i)   prepare and file a registration statement under the Securities
Act, if necessary, with respect to the Rights and the securities purchasable
upon exercise of the Rights on an appropriate form, use its best efforts to
cause such registration statement to become effective as soon as practicable
after such filing and use its best efforts to cause such registration statement
to remain effective (with a prospectus at all times meeting the requirements of
the Securities Act) until the Expiration Date and similarly comply with
applicable state securities laws;

                                       21
<PAGE>
 
            (ii)  use its best efforts, if the Common Stock of the Principal
Party shall be listed or admitted to trading on the New York Stock Exchange or
on another national securities exchange, to list or admit to trading (or
continue the listing of) the Rights and the securities purchasable upon exercise
of the Rights on the New York Stock Exchange or such securities exchange, or, if
the Common Stock of the Principal Party shall not be listed or admitted to
trading on the New York Stock Exchange or a national securities exchange, to
cause the Rights and the securities receivable upon exercise of the Rights to be
authorized for quotation on NASDAQ or on such other system then in use;

            (iii) deliver to holders of the Rights historical financial
statements for the Principal Party which comply in all respects with the
requirements for registration on Form 10 (or any successor form) under the
Exchange Act; and

            (iv)  obtain waivers of any rights of first refusal or preemptive
rights in respect of the Common Stock of the Principal Party subject to purchase
upon exercise of outstanding Rights.

        (d) In case the Principal Party has provision in any of its authorized
securities or in its certificate of incorporation or by-laws or other instrument
governing its affairs, which provision would have the effect of (i) causing such
Principal Party to issue (other than to holders of Rights pursuant to this
Section 13), in connection with, or as a consequence of, the consummation of a
transaction referred to in this Section 13, shares of Common Stock or Common
Stock Equivalents of such Principal Party at less than the then current market
price per share thereof (determined pursuant to Section 11(d) hereof) or
securities exercisable for, or convertible into, Common Stock or Common Stock
Equivalents of such Principal Party at less than such then current market price,
or (ii) providing for any special payment, tax or similar provision in
connection with the issuance of the Common Stock of such Principal Party
pursuant to the provisions of Section 13, then, in such event, the Company
hereby agrees with each holder of Rights that it shall not consummate any such
transaction unless prior thereto the Company and such Principal Party shall have
executed and delivered to the Rights Agent a supplemental agreement providing
that the provision in question of such Principal Party shall have been canceled,
waived or amended, or that the authorized securities shall be redeemed, so that
the applicable provision will have no effect in connection with, or as a
consequence of, the consummation of the proposed transaction.

        (e) The Company covenants and agrees that it shall not, at any time
after the Flip-In Event, enter into any transaction of the type described in
clauses (i) through (iii) of Section 13(a) hereof if (i) at the time of or
immediately after such consolidation, merger, sale, transfer or other
transaction there are any rights, warrants or other instruments or securities
outstanding or agreements in effect which would substantially diminish or
otherwise eliminate the benefits intended to be afforded by the Rights, (ii)
prior to, simultaneously with or immediately after such consolidation, merger,
sale, transfer or other transaction, the stockholders of the Person who
constitutes, or would constitute, the Principal Party for purposes of Section
13(b) hereof shall have received a distribution of Rights previously owned

                                       22
<PAGE>
 
by such Person or any of its Affiliates or Associates or (iii) the form or
nature of organization of the Principal Party would preclude or limit the
exercisability of the Rights.

        Section 14.  Fractional Rights and Fractional Shares.

        (a) The Company shall not be required to issue fractions of Rights or to
distribute Right Certificates which evidence fractional Rights (except prior to
the Distribution Date in accordance with Section 11(n) hereof).  In lieu of such
fractional Rights, there shall be paid to the registered holders of the Right
Certificates with regard to which such fractional Rights would otherwise be
issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right.  For the purposes of this Section 14(a), the current
market value of a whole Right shall be the closing price of the Rights for the
Trading Day immediately prior to the date on which such fractional Rights would
have been otherwise issuable.  The closing price for any day shall be the last
sale price, regular way, or, in case no such sale takes place on such day, the
average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if the Rights are not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national securities exchange
on which the Rights are listed or admitted to trading or, if the Rights are not
listed or admitted to trading on any national securities exchange, the last
quoted price or, if not so quoted, the average of the high bid and low asked
prices in the over-the-counter market, as reported by NASDAQ or such other
system then in use or, if on any such date the Rights are not quoted by any such
organization, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors of the Company.  If on any such date no such market maker is making a
market in the Rights, the fair value of the Rights on such date as determined in
good faith by the Board of Directors of the Company shall be used.

        (b) The Company shall not be required to issue fractions of Preferred
Stock (other than fractions which are integral multiples of one one-thousandth
of a share of Preferred Stock) or to distribute certificates which evidence
fractional shares of Preferred Stock (other than fractions which are integral
multiples of one one-thousandth of a share of Preferred Stock) upon the exercise
or exchange of Rights.  Interests in fractions of Preferred Stock in integral
multiples of one one-thousandth of a share of Preferred Stock may, at the
election of the Company, be evidenced by depositary receipts, pursuant to an
appropriate agreement between the Company and a depositary selected by it;
provided, that such agreement shall provide that the holders of such depositary
receipts shall have all the rights, privileges and preferences to which they are
entitled as beneficial owners of the Preferred Stock represented by such
depositary receipts.  In lieu of fractional shares of Preferred Stock that are
not integral multiples of one one-thousandth of a share of Preferred Stock, the
Company shall pay to the registered holders of Right Certificates at the time
such Rights are exercised or exchanged as herein provided an amount in cash
equal to the same fraction of the current market value of a whole share of
Preferred Stock (as determined in the manner set forth in Section 14(a) hereof)
for the Trading Day immediately prior to the date of such exercise or exchange.

                                       23
<PAGE>
 
        (c) The Company shall not be required to issue fractions of shares of
Common Stock or to distribute certificates which evidence fractional shares of
Common Stock upon the exercise or exchange of Rights.  In lieu of such
fractional shares of Common Stock, the Company shall pay to the registered
holders of the Right Certificates with regard to which such fractional shares of
Common Stock would otherwise be issuable an amount in cash equal to the same
fraction of the current market value of a whole share of Common Stock (as
determined in the manner set forth in Section 14(a) hereof) for the Trading Day
immediately prior to the date of such exercise or exchange.

        (d) The holder of a Right by the acceptance of the Right expressly
waives his right to receive any fractional Rights or any fractional shares upon
exercise or exchange of a Right (except as provided above).

        Section 15.  Rights of Action.  All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Stock); and any registered holder of any Right Certificate (or, prior to
the Distribution Date, of the Common Stock), without the consent of the Rights
Agent or of the holder of any other Right Certificate (or, prior to the
Distribution Date, of the Common Stock), on his own behalf and for his own
benefit, may enforce, and may institute and maintain any suit, action or
proceeding against the Company to enforce, or otherwise act in respect of, his
right to exercise the Rights evidenced by such Right Certificate (or, prior to
the Distribution Date, such Common Stock) in the manner provided therein and in
this Agreement.  Without limiting the foregoing or any remedies available to the
holders of Rights, it is specifically acknowledged that the holders of Rights
would not have an adequate remedy at law for any breach of this Agreement and
will be entitled to specific performance of the obligations under, and
injunctive relief against actual or threatened violations of, the obligations of
any Person subject to this Agreement.

        Section 16.  Agreement of Right Holders.  Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

        (a) prior to the Distribution Date, the Rights will be transferable only
in connection with the transfer of the Common Stock;

        (b) after the Distribution Date, the Right Certificates are transferable
only on the registry books of the Rights Agent if surrendered at the office or
agency of the Rights Agent designated for such purpose, duly endorsed or
accompanied by a proper instrument of transfer; and

        (c) the Company and the Rights Agent may deem and treat the Person in
whose name the Right Certificate (or, prior to the Distribution Date, the Common
Stock certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (notwithstanding any notations of ownership or writing on the
Right Certificates or the

                                       24
<PAGE>
 
Common Stock certificate made by anyone other than the Company or the Rights
Agent) for all purposes whatsoever, and neither the Company nor the Rights Agent
shall be affected by any notice to the contrary.

        Section 17.  Right Certificate Holder Not Deemed a Stockholder.  No
holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Stock or any
other securities of the Company which may at any time be issuable on the
exercise or exchange of the Rights represented thereby, nor shall anything
contained herein or in any Right Certificate be construed to confer upon the
holder of any Right Certificate, as such, any of the rights of a stockholder of
the Company or any right to vote for the election of directors or upon any
matter submitted to stockholders at any meeting thereof, or to give or withhold
consent to any corporate action, or to receive notice of meetings or other
actions affecting stockholders (except as provided in this Agreement), or to
receive dividends or subscription rights, or otherwise, until the Rights
evidenced by such Right Certificate shall have been exercised or exchanged in
accordance with the provisions hereof.

        Section 18.  Concerning the Rights Agent.

        (a) The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
other disbursements incurred in the administration and execution of this
Agreement and the exercise and performance of its duties hereunder.  The Company
shall indemnify the Rights Agent for, and hold it harmless against, any loss,
liability, claim or expense ("Loss") arising out of or in connection with its
duties under this Agreement, including the reasonable costs and expenses of
defending itself against any Loss, unless such Loss shall have been determined
by a court of competent jurisdiction to be a result of the Rights Agent's gross
negligence or intentional misconduct.

        (b) The Rights Agent shall be protected and shall incur no liability
for, or in respect of any action taken, suffered or omitted by it in connection
with, its administration of this Agreement in reliance upon any Right
Certificate or certificate for the Preferred Stock or Common Stock or for other
securities of the Company, instrument of assignment or transfer, power of
attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement or other paper or document believed by it to be genuine
and to be signed, executed and, where necessary, verified or acknowledged, by
the proper Person or Persons, or otherwise upon the advice of counsel as set
forth in Section 20 hereof.

        Section 19.  Merger or Consolidation or Change of Name of Rights Agent.

        (a) Any corporation into which the Rights Agent or any successor Rights
Agent may be merged or with which it may be consolidated, or any corporation
resulting from any merger or consolidation to which the Rights Agent or any
successor Rights Agent shall be a party, or any corporation succeeding to the
stock transfer or corporate trust powers of the Rights Agent or any successor
Rights Agent, shall be the successor to the Rights Agent under

                                       25
<PAGE>
 
this Agreement without the execution or filing of any paper or any further act
on the part of any of the parties hereto; provided, that such corporation would
be eligible for appointment as a successor Rights Agent under the provisions of
Section 21 hereof.  In case at the time such successor Rights Agent shall
succeed to the agency created by this Agreement, any of the Right Certificates
shall have been countersigned but not delivered, any such successor Rights Agent
may adopt the countersignature of the predecessor Rights Agent and deliver such
Right Certificates so countersigned; and in case at that time any of the Right
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Right Certificates either in the name of the predecessor Rights
Agent or in the name of the successor Rights Agent; and in all such cases such
Right Certificates shall have the full force provided in the Right Certificates
and in this Agreement.

        (b) In case at any time the name of the Rights Agent shall be changed
and at such time any of the Right Certificates shall have been countersigned but
not delivered, the Rights Agent may adopt the countersignature under its prior
name and deliver Right Certificates so countersigned; and in case at that time
any of the Right Certificates shall not have been countersigned, the Rights
Agent may countersign such Right Certificates either in its prior name or in its
changed name and in all such cases such Right Certificates shall have the full
force provided in the Right Certificates and in this Agreement.

        Section 20.  Duties of Rights Agent.  The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Right Certificates,
by their acceptance thereof, shall be bound:

        (a) The Rights Agent may consult with legal counsel (who may be legal
counsel for the Company), and the opinion of such counsel shall be full and
complete authorization and protection to the Rights Agent as to any action taken
or omitted by it in good faith and in accordance with such opinion.

        (b) Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it necessary or desirable that any fact or matter be
proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and
established by a certificate signed by the Chairman, the President or any
Executive Vice President or Senior Vice President of the Company and delivered
to the Rights Agent; and such certificate shall be full authorization to the
Rights Agent for any action taken or suffered in good faith by it under the
provisions of this Agreement in reliance upon such certificate.

        (c) The Rights Agent shall be liable hereunder to the Company and any
other Person only for its own gross negligence, bad faith or willful misconduct.
In no case will the Rights Agent be liable for special, indirect, incidental or
consequential loss or damages of any kind whatsoever (including but not limited
to lost profits), even if the Rights Agent has been advised of the possibility
of such damages.  Any liability of the Rights Agent will be limited to the
amount of fees paid by the Company hereunder.

                                       26
<PAGE>
 
        (d) The Rights Agent shall not be liable for or by reason of any of the
statements of fact or recitals contained in this Agreement or in the Right
Certificates (except its countersignature thereof) or be required to verify the
same, but all such statements and recitals are and shall be deemed to have been
made by the Company only.

        (e) The Rights Agent shall not be under any responsibility in respect of
the validity of this Agreement or the execution and delivery hereof (except the
due execution hereof by the Rights Agent) or in respect of the validity or
execution of any Right Certificate (except its countersignature thereof); nor
shall it be responsible for any breach by the Company of any covenant or
condition contained in this Agreement or in any Right Certificate; nor shall it
be responsible for any change in the exercisability of the Rights (including the
Rights becoming void pursuant to Section 11(a)(ii) hereof) or any adjustment in
the terms of the Rights provided for in Sections 3, 11, 13, 23 and 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the exercise of Rights evidenced by Right
Certificates after receipt of a certificate furnished pursuant to Section 12,
describing such change or adjustment); nor shall it by any act hereunder be
deemed to make any representation or warranty as to the authorization or
reservation of any shares of Preferred Stock or other securities to be issued
pursuant to this Agreement or any Right Certificate or as to whether any shares
of Preferred Stock or other securities will, when issued, be validly authorized
and issued, fully paid and nonassessable.

        (f) The Company agrees that it will perform, execute, acknowledge and
deliver or cause to be performed, executed, acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying out or performing by the Rights Agent of
the provisions of this Agreement.

        (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
person reasonably believed by the Rights Agent to be one of the Chairman, the
President or any Executive Vice President or Senior Vice President of the
Company, and to apply to such officers for advice or instructions in connection
with its duties, and it shall not be liable for any action taken or suffered by
it in good faith in accordance with instructions of any such officer or for any
delay in acting while waiting for those instructions.  Any application by the
Rights Agent for written instructions from the Company may, at the option of the
Rights Agent, set forth in writing any action proposed to be taken or omitted by
the Rights Agent under this Agreement and the date on and/or after which such
action shall be taken or such omission shall be effective.  The Rights Agent
shall not be liable for any action taken by, or omission of, the Rights Agent in
accordance with a proposal included in any such application on or after the date
specified in such application (which date shall not be less than five Business
Days after the date any officer of the Company actually receives such
application unless any such officer shall have consented in writing to an
earlier date) unless, prior to taking any such action (or the effective date in
the case of an omission), the Rights Agent shall have received written
instructions in response to such application specifying the action to be taken
or omitted.

                                       27
<PAGE>
 
        (h) The Rights Agent and any stockholder, director, officer or employee
of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights Agent
under this Agreement.  Nothing herein shall preclude the Rights Agent from
acting in any other capacity for the Company or for any other legal entity.

        (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof.

        (j) If, with respect to any Rights Certificate surrendered to the Rights
Agent for exercise or transfer, the certificate contained in the form of
assignment or the form of election to purchase set forth on the reverse thereof,
as the case may be, has not been completed to certify the holder is not an
Acquiring Person (or an Affiliate or Associate thereof), the Rights Agent shall
not take any further action with respect to such requested exercise or transfer
without first consulting with the Company.

        Section 21.  Change of Rights Agent.  The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon 30 days' notice in writing mailed to the Company and to each transfer agent
of the Common Stock or Preferred Stock by registered or certified mail, and,
following the Distribution Date, to the holders of the Right Certificates by
first-class mail.  The Company may remove the Rights Agent or any successor
Rights Agent upon 30 days' notice in writing, mailed to the Rights Agent or
successor Rights Agent, as the case may be, and to each transfer agent of the
Common Stock or Preferred Stock by registered or certified mail, and, following
the Distribution Date, to the holders of the Right Certificates by first-class
mail.  If the Rights Agent shall resign or be removed or shall otherwise become
incapable of acting, the Company shall appoint a successor to the Rights Agent.
If the Company shall fail to make such appointment within a period of 30 days
after giving notice of such removal or after it has been notified in writing of
such resignation or incapacity by the resigning or incapacitated Rights Agent or
by the holder of a Right Certificate (who shall, with such notice, submit his
Right Certificate for inspection by the Company), then the registered holder of
any Right Certificate may apply to any court of competent jurisdiction for the
appointment of a new Rights Agent.  Any successor Rights Agent, whether
appointed by the Company or by such a court, shall be a corporation organized
and doing business under the laws of the United States or the laws of any state
of the United States or the District of Columbia, in good standing, having an
office in the State of Texas or the State of New York, which is authorized under
such laws to exercise corporate trust or stock transfer powers and is subject to
supervision or examination by federal or state authority and which has at the
time of its appointment as Rights Agent a combined capital and surplus of at
least $50 million.  After appointment, the successor Rights Agent shall be
vested with the same powers, rights, duties and responsibilities as if it had
been originally named as Rights

                                       28
<PAGE>
 
Agent without further act or deed; but the predecessor Rights Agent shall
deliver and transfer to the successor Rights Agent any property at the time held
by it hereunder, and execute and deliver any further assurance, conveyance, act
or deed necessary for the purpose.  Not later than the effective date of any
such appointment the Company shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Stock or
Preferred Stock, and, following the Distribution Date, mail a notice thereof in
writing to the registered holders of the Right Certificates.  Failure to give
any notice provided for in this Section 21, however, or any defect therein,
shall not affect the legality or validity of the resignation or removal of the
Rights Agent or the appointment of the successor Rights Agent, as the case may
be.

        Section 22.  Issuance of New Right Certificates.  Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Right Certificates evidencing Rights in such forms
as may be approved by its Board of Directors to reflect any adjustment or change
in the Purchase Price and the number or kind or class of shares or other
securities or property purchasable under the Right Certificates made in
accordance with the provisions of this Agreement.  In addition, in connection
with the issuance or sale of Common Stock following the Distribution Date and
prior to the Expiration Date, the Company may with respect to shares of Common
Stock so issued or sold pursuant to (i) the exercise of stock options, (ii)
under any employee plan or arrangement, (iii) upon the exercise, conversion or
exchange of securities, notes or debentures issued by the Company or (iv) a
contractual obligation of the Company, in each case existing prior to the
Distribution Date, issue Rights Certificates representing the appropriate number
of Rights in connection with such issuance or sale.

        Section 23.  Redemption.

        (a) The Board of Directors of the Company may, at any time prior to the
Flip-In Event, redeem all but not less than all the then outstanding Rights at a
redemption price of $.01 per Right, appropriately adjusted to reflect any stock
split, stock dividend or similar transaction occurring after the date hereof
(the redemption price being hereinafter referred to as the "Redemption Price").
The redemption of the Rights may be made effective at such time, on such basis
and with such conditions as the Board of Directors in its sole discretion may
establish.  The Redemption Price shall be payable, at the option of the Company,
in cash, shares of Common Stock, or such other form of consideration as the
Board of Directors shall determine.

        (b) Immediately upon the action of the Board of Directors ordering the
redemption of the Rights pursuant to paragraph (a) of this Section 23 (or at
such later time as the Board of Directors may establish for the effectiveness of
such redemption), and without any further action and without any notice, the
right to exercise the Rights will terminate and the only right thereafter of the
holders of Rights shall be to receive the Redemption Price.  The Company shall
promptly give public notice of any such redemption; provided, however, that the
failure to give, or any defect in, any such notice shall not affect the validity
of such redemption.  Within 10 days after such action of the Board of Directors
ordering the

                                       29
<PAGE>
 
redemption of the Rights (or such later time as the Board of Directors may
establish for the effectiveness of such redemption), the Company shall mail a
notice of redemption to all the holders of the then outstanding Rights at their
last addresses as they appear upon the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry books of the transfer agent for
the Common Stock.  Any notice which is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice.  Each such
notice of redemption shall state the method by which the payment of the
Redemption Price will be made.

        Section 24.  Exchange.

        (a) The Board of Directors of the Company may, at its option, at any
time after the Flip-In Event, exchange all or part of the then outstanding and
exercisable Rights (which shall not include Rights that have become void
pursuant to the provisions of Section 11(a)(ii) hereof) for Common Stock at an
exchange ratio of one share of Common Stock per Right, appropriately adjusted to
reflect any stock split, stock dividend or similar transaction occurring after
the date hereof (such amount per Right being hereinafter referred to as the
"Exchange Ratio").  Notwithstanding the foregoing, the Board of Directors shall
not be empowered to effect such exchange at any time after an Acquiring Person
shall have become the Beneficial Owner of shares of Common Stock aggregating 50%
or more of the shares of Common Stock then outstanding.  From and after the
occurrence of an event specified in Section 13(a) hereof, any Rights that
theretofore have not been exchanged pursuant to this Section 24(a) shall
thereafter be exercisable only in accordance with Section 13 and may not be
exchanged pursuant to this Section 24(a).  The exchange of the Rights by the
Board of Directors may be made effective at such time, on such basis and with
such conditions as the Board of Directors in its sole discretion may establish.

        (b) Immediately upon the effectiveness of the action of the Board of
Directors of the Company ordering the exchange of any Rights pursuant to
paragraph (a) of this Section 24 and without any further action and without any
notice, the right to exercise such Rights shall terminate and the only right
thereafter of a holder of such Rights shall be to receive that number of shares
of Common Stock equal to the number of such Rights held by such holder
multiplied by the Exchange Ratio.  The Company shall promptly give public notice
of any such exchange; provided, however, that the failure to give, or any defect
in, such notice shall not affect the validity of such exchange.  The Company
shall promptly mail a notice of any such exchange to all of the holders of the
Rights so exchanged at their last addresses as they appear upon the registry
books of the Rights Agent.  Any notice which is mailed in the manner herein
provided shall be deemed given, whether or not the holder receives the notice.
Each such notice of exchange will state the method by which the exchange of the
shares of Common Stock for Rights will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged.  Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 11(a)(ii)
hereof) held by each holder of Rights.

                                       30
<PAGE>
 
        (c) The Company may at its option substitute, and, in the event that
there shall not be sufficient shares of Common Stock issued but not outstanding
or authorized but unissued to permit an exchange of Rights for Common Stock as
contemplated in accordance with this Section 24, the Company shall substitute to
the extent of such insufficiency, for each share of Common Stock that would
otherwise be issuable upon exchange of a Right, a number of shares of Preferred
Stock or fraction thereof (or equivalent preferred shares, as such term is
defined in Section 11(b)) such that the current per share market price
(determined pursuant to Section 11(d) hereof) of one share of Preferred Stock
(or equivalent preferred share) multiplied by such number or fraction is equal
to the current per share market price of one share of Common Stock (determined
pursuant to Section 11(d) hereof) as of the date of such exchange.

        Section 25.  Notice of Certain Events.

        (a) In case the Company shall at any time after the earlier of the
Distribution Date or the Stock Acquisition Date propose (i) to pay any dividend
payable in stock of any class to the holders of its Preferred Stock or to make
any other distribution to the holders of its Preferred Stock (other than a
regular quarterly cash dividend), (ii) to offer to the holders of its Preferred
Stock rights or warrants to subscribe for or to purchase any additional shares
of Preferred Stock or shares of stock of any class or any other securities,
rights or options, (iii) to effect any reclassification of its Preferred Stock
(other than a reclassification involving only the subdivision or combination of
outstanding Preferred Stock), (iv) to effect the liquidation, dissolution or
winding up of the Company, or (v) to pay any dividend on the Common Stock
payable in Common Stock or to effect a subdivision, combination or consolidation
of the Common Stock (by reclassification or otherwise than by payment of
dividends in Common Stock), then, in each such case, the Company shall give to
each holder of a Right Certificate, in accordance with Section 26 hereof, a
notice of such proposed action, which shall specify the record date for the
purposes of such stock dividend, or distribution of rights or warrants, or the
date on which such liquidation, dissolution or winding up is to take place and
the date of participation therein by the holders of the Common Stock and/or
Preferred Stock, if any such date is to be fixed, and such notice shall be so
given in the case of any action covered by clause (i) or (ii) above at least 10
days prior to the record date for determining holders of the Preferred Stock for
purposes of such action, and in the case of any such other action, at least 10
days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of the Common Stock and/or Preferred Stock,
whichever shall be the earlier.

        (b) In case any event described in Section 11(a)(ii) or Section 13 shall
occur then the Company shall as soon as practicable thereafter give to each
holder of a Right Certificate (or if occurring prior to the Distribution Date,
the holders of the Common Stock) in accordance with Section 26 hereof, a notice
of the occurrence of such event, which notice shall describe such event and the
consequences of such event to holders of Rights under Section 11(a)(ii) and
Section 13 hereof.

                                       31
<PAGE>
 
        Section 26.  Notices.  Notices or demands authorized by this Agreement
to be given or made by the Rights Agent or by the holder of any Right
Certificate to or on the Company shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed (until another address is filed in
writing with the Rights Agent) as follows:

                  Cross Timbers Oil Company
                  810 Houston Street
                  Suite 2000
                  Fort Worth, Texas  76102
                  Attention: Secretary

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Right Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid, addressed (until another address
is filed in writing with the Company) as follows:

                  ChaseMellon Shareholder Services, LLC
                  Suite 2300
                  2323 Bryan Street
                  Dallas, Texas  75201
                  Attention:  Barbara Robbins

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

        Section 27.  Supplements and Amendments.  Except as provided in the
penultimate sentence of this Section 27, for so long as the Rights are then
redeemable, the Company may in its sole and absolute discretion, and the Rights
Agent shall if the Company so directs, supplement or amend any provision of this
Agreement in any respect without the approval of any holders of the Rights.  At
any time when the Rights are no longer redeemable, except as provided in the
penultimate sentence of this Section 27, the Company may, and the Rights Agent
shall, if the Company so directs, supplement or amend this Agreement without the
approval of any holders of Rights, provided that no such supplement or amendment
may (a) adversely affect the interests of the holders of Rights as such (other
than an Acquiring Person or an Affiliate or Associate of an Acquiring Person),
(b) cause this Agreement again to become amendable other than in accordance with
this sentence or (c) cause the Rights again to become redeemable.
Notwithstanding anything contained in this Agreement to the contrary, no
supplement or amendment shall be made which changes the Redemption Price.  Upon
the delivery of a certificate from an appropriate officer of the Company which
states that the proposed supplement or amendment is in compliance with the terms
of this Section 27, the Rights Agent shall execute such supplement or amendment.

                                       32
<PAGE>
 
        Section 28.  Successors.  All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

        Section 29.  Benefits of this Agreement.  Nothing in this Agreement
shall be construed to give to any Person other than the Company, the Rights
Agent and the registered holders of the Right Certificates (and, prior to the
Distribution Date, the Common Stock) any legal or equitable right, remedy or
claim under this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Right Certificates (and, prior to the Distribution Date, the Common Stock).

        Section 30.  Determinations and Actions by the Board of Directors.  The
Board of Directors of the Company shall have the exclusive power and authority
to administer this Agreement and to exercise the rights and powers specifically
granted to the Board of Directors of the Company or to the Company, or as may be
necessary or advisable in the administration of this Agreement, including,
without limitation, the right and power to (i) interpret the provisions of this
Agreement and (ii) make all determinations deemed necessary or advisable for the
administration of this Agreement (including, without limitation, a determination
to redeem or not redeem the Rights or to amend or not amend this Agreement).
All such actions, calculations, interpretations and determinations (including,
for purposes of clause (y) below, all omissions with respect to the foregoing)
that are done or made by the Board of Directors of the Company in good faith,
shall (x) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights, as such, and all other parties, and (y) not subject the
Board of Directors to any liability to the holders of the Rights.

        Section 31.  Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated.

        Section 32.  Governing Law.  This Agreement and each Right Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of Delaware and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

        Section 33.  Counterparts.  This Agreement may be executed in any number
of counterparts and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

        Section 34.  Descriptive Headings.  Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                       33
<PAGE>
 
        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed, all as of the day and year first above written.

                                       CROSS TIMBERS OIL COMPANY



                                       By:    BOB R. SIMPSON
                                          ------------------------------------
                                       Name:  Bob R. Simpson
                                       Title: Chairman of the Board


 
                                       CHASEMELLON SHAREHOLDER SERVICES, LLC
                                       as Rights Agent



                                       By:    BARBARA J. ROBBINS
                                          ------------------------------------
                                       Name:  Barbara J. Robbins
                                            ----------------------------------
                                       Title: Vice President
                                             ---------------------------------

                                       34
<PAGE>
 
                                                                       Exhibit A
                                                                       ---------
                                    FORM OF
                          CERTIFICATE OF DESIGNATION

                                       of

                 SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                      of

                           CROSS TIMBERS OIL COMPANY

            Pursuant to Section 151 of the General Corporation Law
                           of the State of Delaware

        Cross Timbers Oil Company, a corporation organized and existing under
the General Corporation Law of the State of Delaware, in accordance with the
provisions of Section 103 thereof, DOES HEREBY CERTIFY:

        That pursuant to the authority vested in the Board of Directors in
accordance with the provisions of the Second Restated Certificate of
Incorporation of the said Corporation, the said Board of Directors on August 25,
1998 adopted the following resolution creating a series of 70,000 shares of
Preferred Stock designated as "Series A Junior Participating Preferred Stock":

             RESOLVED, that pursuant to the authority vested in the Board of
        Directors of this Corporation in accordance with the provisions of the
        Second Restated Certificate of Incorporation, a series of Preferred
        Stock, par value $.01 per share, of the Corporation be and hereby is
        created, and that the designation and number of shares thereof and the
        voting and other powers, preferences and relative, participating,
        optional or other rights of the shares of such series and the
        qualifications, limitations and restrictions thereof are as follows:

                 SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

        1.   Designation and Amount.  There shall be a series of Preferred Stock
that shall be designated as "Series A Junior Participating Preferred Stock," and
the number of shares constituting such series shall be 70,000.  Such number of
shares may be increased or decreased by resolution of the Board of Directors;
provided, however, that no decrease shall reduce the number of shares of Series
A Junior Participating  Preferred Stock to less than the number of shares then
issued and outstanding plus the number of shares issuable upon exercise of
outstanding rights, options or warrants or upon conversion of outstanding
securities issued by the Corporation.


                                      A-1
<PAGE>
 
        2.   Dividends and Distribution.

             (A) Subject to the prior and superior rights of the holders of any
shares of any class or series of stock of the Corporation ranking prior and
superior to the shares of Series A Junior Participating Preferred Stock with
respect to dividends, the holders of shares of Series A Junior Participating
Preferred Stock, in preference to the holders of shares of any class or series
of stock of the Corporation ranking junior to the Series A Junior Participating
Preferred Stock in respect thereof, shall be entitled to receive, when, as and
if declared by the Board of Directors out of funds legally available for the
purpose, quarterly dividends payable in cash on the 15th day of January, April,
July and October, in each year (each such date being referred to herein as a
"Quarterly Dividend Payment Date"), commencing on the first Quarterly Dividend
Payment Date after the first issuance of a share or fraction of a share of
Series A Junior Participating Preferred Stock, in an amount per share (rounded
to the nearest cent) equal to the greater of (a) $10.00 or (b) the Adjustment
Number (as defined below) times the aggregate per share amount of all cash
dividends, and the Adjustment Number times the aggregate per share amount
(payable in kind) of all non-cash dividends or other distributions other than a
dividend payable in shares of Common Stock or a subdivision of the outstanding
shares of Common Stock (by reclassification or otherwise), declared on the
Common Stock, par value $.01 per share, of the Corporation (the "Common Stock")
since the immediately preceding Quarterly Dividend Payment Date, or, with
respect to the first Quarterly Dividend Payment Date, since the first issuance
of any share or fraction of a share of Series A Junior Participating Preferred
Stock.  The "Adjustment Number" shall initially be 1000.  In the event the
Corporation shall at any time after September 15, 1998 (i) declare and pay any
dividend on Common Stock payable in shares of Common Stock, (ii) subdivide the
outstanding Common Stock or (iii) combine the outstanding Common Stock into a
smaller number of shares, then in each such case the Adjustment Number in effect
immediately prior to such event shall be adjusted by multiplying such Adjustment
Number by a fraction the numerator of which is the number of shares of Common
Stock outstanding immediately after such event and the denominator of which is
the number of shares of Common Stock that were outstanding immediately prior to
such event.

             (B) The Corporation shall declare a dividend or distribution on the
Series A Junior Participating Preferred Stock as provided in paragraph (A) above
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock).

             (C) Dividends shall begin to accrue and be cumulative on
outstanding shares of Series A Junior Participating Preferred Stock from the
Quarterly Dividend Payment Date next preceding the date of issue of such shares
of Series A Junior Participating Preferred Stock, unless the date of issue of
such shares is prior to the record date for the first Quarterly Dividend Payment
Date, in which case dividends on such shares shall begin to accrue from the date
of issue of such shares, or unless the date of issue is a Quarterly Dividend
Payment Date or is a date after the record date for the determination of holders
of shares of Series A Junior Participating Preferred Stock entitled to receive a
quarterly dividend and before such Quarterly Dividend Payment Date, in either of
which events such dividends shall begin to accrue and be 

                                      A-2
<PAGE>
 
cumulative from such Quarterly Dividend Payment Date. Accrued but unpaid
dividends shall not bear interest. Dividends paid on the shares of Series A
Junior Participating Preferred Stock in an amount less than the total amount of
such dividends at the time accrued and payable on such shares shall be allocated
pro rata on a share-by-share basis among all such shares at the time
outstanding. The Board of Directors may fix a record date for the determination
of holders of shares of Series A Junior Participating Preferred Stock entitled
to receive payment of a dividend or distribution declared thereon, which record
date shall be no more than 60 days prior to the date fixed for the payment
thereof.

        3.   Voting Rights.  The holders of shares of Series A Junior
Participating Preferred Stock shall have the following voting rights:

             (A) Each share of Series A Junior Participating Preferred Stock
shall entitle the holder thereof to a number of votes equal to the Adjustment
Number on all matters submitted to a vote of the stockholders of the
Corporation.

             (B) Except as required by law and by Section 10 hereof, holders of
Series A Junior Participating Preferred Stock shall have no special voting
rights and their consent shall not be required (except to the extent they are
entitled to vote with holders of Common Stock as set forth herein) for taking
any corporate action.

             (C) If, at the time of any annual meeting of stockholders for the
election of directors, the equivalent of six quarterly dividends (whether or not
consecutive) payable on any share or shares of Series A Junior Participating
Preferred Stock are in default, the number of directors constituting the Board
of Directors of the Company shall be increased by two.  In addition to voting
together with the holders of Common Stock for the election of other directors of
the Company, the holders of record of the Series A Junior Participating
Preferred Stock, voting separately as a class to the exclusion of the holders of
Common Stock, shall be entitled at said meeting of stockholders (and at each
subsequent annual meeting of stockholders), unless all dividends in arrears on
the Series A Junior Participating Preferred Stock have been paid or declared and
set apart for payment prior thereto, to vote for the election of two directors
of the Company, the holders of any Series A Junior Participating Preferred Stock
being entitled to cast a number of votes per share of Series A Junior
Participating Preferred Stock as is specified in paragraph (A) of this Section
3.  Each such additional director shall not be a member of Class I, Class II, or
Class III of the Board of Directors of the Company, but shall serve until the
next annual meeting of stockholders for the election of directors, or until his
successor shall be elected and shall qualify, or until his right to hold such
office terminates pursuant to the provisions of this Section 3(C).  Until the
default in payments of all dividends which permitted the election of said
directors shall cease to exist, any director who shall have been so elected
pursuant to the next preceding sentence may be removed at any time, without
cause, only by the affirmative vote of the holders of the shares of Series A
Junior Participating Preferred Stock at the time entitled to cast a majority of
the votes entitled to be cast for the election of any such director at a special
meeting of such holders called for that purpose, and any vacancy thereby created
may be filled by the vote of such holders.  If and when such default shall cease
to exist, the holders of the Series A Junior

                                      A-3
<PAGE>
 
Participating Preferred Stock shall be divested of the foregoing special voting
rights, subject to revesting in the event of each and every subsequent like
default in payments of dividends. Upon the termination of the foregoing special
voting rights, the terms of office of all persons who may have been elected
directors pursuant to said special voting rights shall forthwith terminate, and
the number of directors constituting the Board of Directors shall be reduced by
two.  The voting rights granted by this Section 3(C) shall be in addition to any
other voting rights granted to the holders of the Series A Junior Participating
Preferred Stock in this Section 3.

        4.   Certain Restrictions.

             (A) Whenever quarterly dividends or other dividends or
distributions payable on the Series A Junior Participating Preferred Stock as
provided in Section 2 are in arrears, thereafter and until all accrued and
unpaid dividends and distributions, whether or not declared, on shares of Series
A Junior Participating Preferred Stock outstanding shall have been paid in full,
the Corporation shall not:

                 (i)    declare or pay dividends on, make any other
distributions on, or redeem or purchase or otherwise acquire for consideration
any shares of stock ranking junior (either as to dividends or upon liquidation,
dissolution or winding up) to the Series A Junior Participating Preferred Stock;

                 (ii)   declare or pay dividends on or make any other
distributions on any shares of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with the Series A Junior
Participating Preferred Stock, except dividends paid ratably on the Series A
Junior Participating Preferred Stock and all such parity stock on which
dividends are payable or in arrears in proportion to the total amounts to which
the holders of all such shares are then entitled; or

                 (iii)  purchase or otherwise acquire for consideration any
shares of Series A Junior Participating Preferred Stock, or any shares of stock
ranking on a parity with the Series A Junior Participating Preferred Stock,
except in accordance with a purchase offer made in writing or by publication (as
determined by the Board of Directors) to all holders of Series A Junior
Participating Preferred Stock, or to such holders and holders of any such shares
ranking on a parity therewith, upon such terms as the Board of Directors, after
consideration of the respective annual dividend rates and other relative rights
and preferences of the respective series and classes, shall determine in good
faith will result in fair and equitable treatment among the respective series or
classes.

             (B) The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the Corporation could, under paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

                                      A-4
<PAGE>
 
        5.   Reacquired Shares.  Any shares of Series A Junior Participating
Preferred Stock purchased or otherwise acquired by the Corporation in any manner
whatsoever shall be retired promptly after the acquisition thereof.  All such
shares shall upon their retirement become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of  Preferred Stock
to be created by resolution or resolutions of the Board of Directors, subject to
any conditions and restrictions on issuance set forth herein.

        6.   Liquidation, Dissolution or Winding Up. (A) Upon any liquidation,
dissolution or winding up of the Corporation, voluntary or otherwise, no
distribution shall be made to the holders of shares of stock ranking junior
(either as to dividends or upon liquidation, dissolution or winding up) to the
Series A Junior Participating Preferred Stock unless, prior thereto, the holders
of shares of Series A Junior Participating Preferred Stock shall have received
an amount per share (the "Series A Liquidation Preference") equal to the greater
of (i) $10.00 plus an amount equal to accrued and unpaid dividends and
distributions thereon, whether or not declared, to the date of such payment, or
(ii) the Adjustment Number times the per share amount of all cash and other
property to be distributed in respect of the Common Stock upon such liquidation,
dissolution or winding up of the Corporation.

             (B) In the event, however, that there are not sufficient assets
available to permit payment in full of the Series A Liquidation Preference and
the liquidation preferences of all other classes and series of stock of the
Corporation, if any, that rank on a parity with the Series A Junior
Participating Preferred Stock in respect thereof, then the assets available for
such distribution shall be distributed ratably to the holders of the Series A
Junior Participating Preferred Stock and the holders of such parity shares in
proportion to their respective liquidation preferences.

             (C) Neither the merger or consolidation of the Corporation into or
with another corporation nor the merger or consolidation of any other
corporation into or with the Corporation shall be deemed to be a liquidation,
dissolution or winding up of the Corporation within the meaning of this Section
6.

        7.   Consolidation, Merger, Etc.  In case the Corporation shall enter
into any consolidation, merger, combination or other transaction in which the
outstanding shares of Common Stock are exchanged for or changed into other stock
or securities, cash and/or any other property, then in any such case each share
of Series A Junior Participating Preferred Stock shall at the same time be
similarly exchanged or changed in an amount per share equal to the Adjustment
Number times the aggregate amount of stock, securities, cash and/or any other
property (payable in kind), as the case may be, into which or for which each
share of Common Stock is changed or exchanged.

        8.   No Redemption.  Shares of Series A Junior Participating Preferred
Stock shall not be subject to redemption by the Company.

        9.   Ranking.  The Series A Junior Participating Preferred Stock shall
rank junior to all other series of the Preferred Stock as to the payment of
dividends and as to the 

                                      A-5
<PAGE>
 
distribution of assets upon liquidation, dissolution or winding up, unless the
terms of any such series shall provide otherwise, and shall rank senior to the
Common Stock as to such matters.

        10.  Amendment.  At any time that any shares of Series A Junior
Participating Preferred Stock are outstanding, the Certificate of Incorporation
of the Corporation shall not be amended in any manner which would materially
alter or change the powers, preferences or special rights of the Series A Junior
Participating Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of two-thirds of the outstanding shares of
Series A Junior Participating Preferred Stock, voting separately as a class.

        11.  Fractional Shares.  Series A Junior Participating Preferred Stock
may be issued in fractions of a share that shall entitle the holder, in
proportion to such holder's fractional shares, to exercise voting rights,
receive dividends, participate in distributions and to have the benefit of all
other rights of holders of Series A Junior Participating Preferred Stock.

        IN WITNESS WHEREOF, the undersigned has executed this Certificate this
__ day of _________________, 1998.

                            CROSS TIMBERS OIL COMPANY



                            By:
                               -------------------------------
                                Name: Bob R. Simpson
                                Title: Chairman of the Board


                                      A-6
<PAGE>
 
                                                                       Exhibit B
                                                                       ---------

                           Form of Right Certificate

Certificate No. R-______

        NOT EXERCISABLE AFTER AUGUST 25, 2008 OR EARLIER IF REDEMPTION OR
        EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.01 PER RIGHT
        AND TO EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER
        CERTAIN CIRCUMSTANCES, AS SET FORTH IN THE RIGHTS AGREEMENT, RIGHTS
        OWNED BY OR TRANSFERRED TO ANY PERSON WHO IS OR BECOMES AN ACQUIRING
        PERSON (AS DEFINED IN THE RIGHTS AGREEMENT) AND CERTAIN TRANSFEREES
        THEREOF WILL BECOME NULL AND VOID AND WILL NO LONGER BE TRANSFERABLE.


                               RIGHT CERTIFICATE

                           CROSS TIMBERS OIL COMPANY

        This certifies that ____________________________ or registered assigns,
is the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Rights Agreement, dated as of August 25, 1998, as the same may be amended
from time to time (the "Rights Agreement"), between Cross Timbers Oil Company, a
Delaware corporation (the "Company"), and ChaseMellon Shareholder Services, LLC,
as Rights Agent (the "Rights Agent"), to purchase from the Company at any time
after the Distribution Date (as such term is defined in the Rights Agreement)
and prior to 5:00 P.M., New York City time, on August 25, 2008 at the office or
agency of the Rights Agent designated for such purpose, or of its successor as
Rights Agent, one one-thousandth of a fully paid non-assessable share of Series
A Junior Participating Preferred Stock, par value $.01 per share (the "Preferred
Stock"), of the Company at a purchase price of $80.00 per one one-thousandth of
a share of Preferred Stock (the "Purchase Price"), upon presentation and
surrender of this Right Certificate with the Form of Election to Purchase duly
executed.  The number of Rights evidenced by this Rights Certificate (and the
number of one one-thousandths of a share of Preferred Stock which may be
purchased upon exercise hereof) set forth above, and the Purchase Price set
forth above, are the number and Purchase Price as of September 15, 1998, based
on the Preferred Stock as constituted at such date.  As provided in the Rights
Agreement, the Purchase Price, the number of one one-thousandths of a share of
Preferred Stock (or other securities or property) which may be

                                      B-1
<PAGE>
 
purchased upon the exercise of the Rights and the number of Rights evidenced by
this Right Certificate are subject to modification and adjustment upon the
happening of certain events.

        This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Right Certificates.  Copies of
the Rights Agreement are on file at the principal executive offices of the
Company and the above-mentioned office or agency of the Rights Agent.  The
Company will mail to the holder of this Right Certificate a copy of the Rights
Agreement without charge after receipt of a written request therefor.

        This Right Certificate, with or without other Right Certificates, upon
surrender at the office or agency of the Rights Agent designated for such
purpose, may be exchanged for another Right Certificate or Right Certificates of
like tenor and date evidencing Rights entitling the holder to purchase a like
aggregate number of shares of Preferred Stock as the Rights evidenced by the
Right Certificate or Right Certificates surrendered shall have entitled such
holder to purchase.  If this Right Certificate shall be exercised in part, the
holder shall be entitled to receive upon surrender hereof another Right
Certificate or Right Certificates for the number of whole Rights not exercised.

        Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Certificate (i) may be redeemed by the Company at a redemption price of
$.01 per Right or (ii) may be exchanged in whole or in part for shares of the
Company's Common Stock, par value $.01 per share, or shares of Preferred Stock.

        No fractional shares of Preferred Stock or Common Stock will be issued
upon the exercise or exchange of any Right or Rights evidenced hereby (other
than fractions of Preferred Stock which are integral multiples of one one-
thousandth of a share of Preferred Stock, which may, at the election of the
Company, be evidenced by depository receipts), but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

        No holder of this Right Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of the Preferred
Stock or of any other securities of the Company which may at any time be
issuable on the exercise or exchange hereof, nor shall anything contained in the
Rights Agreement or herein be construed to confer upon the holder hereof, as
such, any of the rights of a stockholder of the Company or any right to vote for
the election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement) or to receive dividends or subscription
rights, or otherwise, until the Right or

                                      B-2
<PAGE>
 
Rights evidenced by this Right Certificate shall have been exercised or
exchanged as provided in the Rights Agreement.

        This Right Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

        WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal.  Dated as of August 25, 1998.

                            CROSS TIMBERS OIL COMPANY



                            By:
                               --------------------------------
                                 Chairman of the Board
ATTEST:



- ------------------------------------
Secretary


Countersigned:


CHASEMELLON SHAREHOLDER SERVICES, LLC, as Rights Agent



By
  ----------------------------------
   [Title]


                                      B-3
<PAGE>
 
                   Form of Reverse Side of Right Certificate

                               FORM OF ASSIGNMENT
                               ------------------

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate)

        FOR VALUE RECEIVED __________________________ hereby sells, assigns and
transfers unto ______________________________________________________
_________________________________________________________________________
                 (Please print name and address of transferee)

_______ Rights represented by this Right Certificate, together with all right,
title and interest therein, and does hereby irrevocably constitute and appoint
___________________________ Attorney, to transfer said Rights on the books of
the within-named Company, with full power of substitution.

Dated:  
        ---------------------------

                                            ------------------------------------
                                                 Signature

Signature Guaranteed:


        Signatures must be guaranteed by a bank, trust company, broker, dealer
or other eligible institution participating in a recognized signature guarantee
medallion program.

 ..........................................................
                               (To be completed)

        The undersigned hereby certifies that the Rights evidenced by this Right
Certificate are not beneficially owned by, were not acquired by the undersigned
from, and are not being assigned to, an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).


                                 ------------------------------------
                                       Signature


                                      B-4
<PAGE>
 
             Form of Reverse Side of Right Certificate - continued

                          FORM OF ELECTION TO PURCHASE
                          ----------------------------

                 (To be executed if holder desires to exercise
                 Rights represented by the Rights Certificate)

To CROSS TIMBERS OIL COMPANY:

        The undersigned hereby irrevocably elects to exercise ________ Rights
represented by this Right Certificate to purchase the shares of Preferred Stock
(or other securities or property) issuable upon the exercise of such Rights and
requests that certificates for such shares of Preferred Stock (or such other
securities) be issued in the name of:


- -------------------------------------------------------------------------
                        (Please print name and address)


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

If such number of Rights shall not be all the Rights evidenced by this Right
Certificate, a new Right Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number


- -------------------------------------------------------------------------
                        (Please print name and address)


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

Dated:
      -----------------------


                                 ------------------------------------
                                       Signature
       (Signature must conform to holder specified on Right Certificate)

Signature Guaranteed:

        Signature must be guaranteed by a bank, trust company, broker, dealer or
other eligible institution participating in a recognized signature guarantee
medallion program.


                                      B-5
<PAGE>
 
             Form of Reverse Side of Right Certificate - continued


- ----------------------------------------------------------------------------
                               (To be completed)

        The undersigned certifies that the Rights evidenced by this Right
Certificate are not beneficially owned by, and were not acquired by the
undersigned from, an Acquiring Person or an Affiliate or Associate thereof (as
defined in the Rights Agreement).


                                 ------------------------------------
                                       Signature


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


                                     NOTICE
                                     ------

        The signature in the Form of Assignment or Form of Election to Purchase,
as the case may be, must conform to the name as written upon the face of this
Right Certificate in every particular, without alteration or enlargement or any
change whatsoever.

        In the event the certification set forth above in the Form of Assignment
or the Form of Election to Purchase, as the case may be, is not completed, such
Assignment or Election to Purchase will not be honored.


                                      B-6
<PAGE>
 
                                                                       Exhibit C
                                                                       ---------

        UNDER CERTAIN CIRCUMSTANCES, AS SET FORTH IN THE RIGHTS AGREEMENT,
        RIGHTS OWNED BY OR TRANSFERRED TO ANY PERSON WHO IS OR BECOMES AN
        ACQUIRING PERSON (AS DEFINED IN THE RIGHTS AGREEMENT) AND CERTAIN
        TRANSFEREES THEREOF WILL BECOME NULL AND VOID AND WILL NO LONGER BE
        TRANSFERABLE.

                         SUMMARY OF RIGHTS TO PURCHASE
                          SHARES OF PREFERRED STOCK OF
                           CROSS TIMBERS OIL COMPANY

        On August 25, 1998, the Board of Directors of Cross Timbers Oil Company
(the "Company") declared a dividend of one preferred share purchase right (a
"Right") for each outstanding share of common stock, par value $.01 per share,
of the Company (the "Common Stock").  The dividend is payable on September 15,
1998 (the "Record Date") to the stockholders of record on that date.  Each Right
entitles the registered holder to purchase from the Company one one-thousandth
of a share of Series A Junior Participating Preferred Stock, par value $.01 per
share, of the Company (the "Preferred Stock") at a price of $80.00 per one one-
thousandth of a share of Preferred Stock (the "Purchase Price"), subject to
adjustment.  The description and terms of the Rights are set forth in a Rights
Agreement dated as of August 25, 1998, as the same may be amended from time to
time (the "Rights Agreement"), between the Company and ChaseMellon Shareholder
Services, LLC, as Rights Agent (the "Rights Agent").

        Until the earlier to occur of (i) 10 days following a public
announcement that a person or group of affiliated or associated persons (with
certain exceptions, an "Acquiring Person") has acquired beneficial ownership of
15% or more of the outstanding shares of Common Stock or (ii) 10 business days
(or such later date as may be determined by action of the Board of Directors
prior to such time as any person or group of affiliated persons becomes an
Acquiring Person) following the commencement of, or announcement of an intention
to make, a tender offer or exchange offer the consummation of which would result
in the beneficial ownership by a person or group of 15% or more of the
outstanding shares of Common Stock (the earlier of such dates being called the
"Distribution Date"), the Rights will be evidenced, with respect to any of the
Common Stock certificates outstanding as of the Record Date, by such Common
Stock certificate together with a copy of this Summary of Rights.

        The Rights Agreement provides that, until the Distribution Date (or
earlier expiration of the Rights), the Rights will be transferred with and only
with the Common Stock. Until the Distribution Date (or earlier expiration of the
Rights), new Common Stock certificates issued after the Record Date upon
transfer or new issuances of Common Stock will contain a

                                      C-1
<PAGE>
 
notation incorporating the Rights Agreement by reference.  Until the
Distribution Date (or earlier expiration of the Rights), the surrender for
transfer of any certificates for shares of Common Stock outstanding as of the
Record Date, even without such notation or a copy of this Summary of Rights,
will also constitute the transfer of the Rights associated with the shares of
Common Stock represented by such certificate.  As soon as practicable following
the Distribution Date, separate certificates evidencing the Rights ("Right
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date and such separate Right Certificates
alone will evidence the Rights.

        The Rights are not exercisable until the Distribution Date.  The Rights
will expire on August 25, 2008 (the "Final Expiration Date"), unless the Final
Expiration Date is advanced or extended or unless the Rights are earlier
redeemed or exchanged by the Company, in each case as described below.

        The Purchase Price payable, and the number of shares of Preferred Stock
or other securities or property issuable, upon exercise of the Rights is subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Stock, (ii) upon the grant to holders of the Preferred Stock of certain rights
or warrants to subscribe for or purchase Preferred Stock at a price, or
securities convertible into Preferred Stock with a conversion price, less than
the then-current market price of the Preferred Stock or (iii) upon the
distribution to holders of the Preferred Stock of evidences of indebtedness or
assets (excluding regular periodic cash dividends or dividends payable in
Preferred Stock) or of subscription rights or warrants (other than those
referred to above).

        The number of outstanding Rights is subject to adjustment in the event
of a stock dividend on the Common Stock payable in shares of Common Stock or
subdivisions, consolidations or combinations of the Common Stock occurring, in
any such case, prior to the Distribution Date.

        Shares of Preferred Stock purchasable upon exercise of the Rights will
not be redeemable.  Each share of Preferred Stock will be entitled, when, as and
if declared, to a minimum preferential quarterly dividend payment of $10.00 per
share but will be entitled to an aggregate dividend of 1000 times the dividend
declared per share of Common Stock.  In the event of liquidation, dissolution or
winding up of the Company, the holders of the Preferred Stock will be entitled
to a minimum preferential payment of $10.00 per share (plus any accrued but
unpaid dividends) but will be entitled to an aggregate payment of 1000 times the
payment made per share of Common Stock.  Each share of Preferred Stock will have
1000 votes, voting together with the Common Stock.  Finally, in the event of any
merger, consolidation or other transaction in which outstanding shares of Common
Stock are converted or exchanged, each share of Preferred Stock will be entitled
to receive 1000 times the amount received per share of Common Stock.  These
rights are protected by customary antidilution provisions.


                                      C-2
<PAGE>
 
          Because of the nature of the Preferred Stock's dividend, liquidation
and voting rights, the value of the one one-thousandth interest in a share of
Preferred Stock purchasable upon exercise of each Right should approximate the
value of one share of Common Stock.

          In the event that any person or group of affiliated or associated
persons becomes an Acquiring Person, each holder of a Right, other than Rights
beneficially owned by the Acquiring Person (which will thereupon become void),
will thereafter have the right to receive upon exercise of a Right that number
of shares of Common Stock having a market value of two times the exercise price
of the Right.

          In the event that, after a person or group has become an Acquiring
Person, the Company is acquired in a merger or other business combination
transaction or 50% or more of its consolidated assets or earning power are sold,
proper provisions will be made so that each holder of a Right (other than Rights
beneficially owned by an Acquiring Person which will have become void) will
thereafter have the right to receive upon the exercise of a Right that number of
shares of common stock of the person with whom the Company has engaged in the
foregoing transaction (or its parent) that at the time of such transaction have
a market value of two times the exercise price of the Right.

          At any time after any person or group becomes an Acquiring Person and
prior to the earlier of one of the events described in the previous paragraph or
the acquisition by such Acquiring Person of 50% or more of the outstanding
shares of Common Stock, the Board of Directors of the Company may exchange the
Rights (other than Rights owned by such Acquiring Person which will have become
void), in whole or in part, for shares of Common Stock or Preferred Stock (or a
series of the Company's preferred stock having equivalent rights, preferences
and privileges), at an exchange ratio of one share of Common Stock, or a
fractional share of Preferred Stock (or other preferred stock) equivalent in
value thereto, per Right.

          With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.  No fractional shares of Preferred Stock or Common Stock
will be issued (other than fractions of Preferred Stock which are integral
multiples of one one-thousandth of a share of Preferred Stock, which may, at the
election of the Company, be evidenced by depositary receipts), and in lieu
thereof an adjustment in cash will be made based on the current market price of
the Preferred Stock or the Common Stock.

          At any time prior to the time an Acquiring Person becomes such, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $.01 per Right (the "Redemption Price") payable, at the
option of the Company, in cash, shares of Common Stock or such other form of
consideration as the Board of Directors of the Company shall determine.  The
redemption of the Rights may be made effective at such time, on such basis and
with such conditions as the Board of Directors in its sole discretion may
establish.

                                      C-3
<PAGE>
 
Immediately upon any redemption of the Rights, the right to exercise the Rights
will terminate and the only right of the holders of Rights will be to receive
the Redemption Price.

          For so long as the Rights are then redeemable, the Company may, except
with respect to the Redemption Price, amend the Rights Agreement in any manner.
After the Rights are no longer redeemable, the Company may, except with respect
to the Redemption Price, amend the Rights Agreement in any manner that does not
adversely affect the interests of holders of the Rights.

          Until a Right is exercised or exchanged, the holder thereof, as such,
will have no rights as a stockholder of the Company, including, without
limitation, the right to vote or to receive dividends.

          A copy of the Rights Agreement has been filed with the Securities and
Exchange Commission as an Exhibit to a Registration Statement on Form 8-A to be
filed by the Company.  A copy of the Rights Agreement is available free of
charge from the Company. This summary description of the Rights does not purport
to be complete and is qualified in its entirety by reference to the Rights
Agreement, as the same may be amended from time to time, which is hereby
incorporated herein by reference.

                                      C-4

<PAGE>
 
                                                                    EXHIBIT 99.1
[CROSS TIMBERS OIL COMPANY NEWS RELEASE LETTERHEAD]
NUMBER:  98-19

             CROSS TIMBERS OIL PLANS TO DISTRIBUTE ROYALTY TRUSTS;
                        ADOPTS STOCKHOLDER RIGHTS PLAN

     FORT WORTH, TX (AUGUST 26, 1998) - Cross Timbers Oil Company (NYSE-XTO)
today announced that it plans to begin the systematic distribution of royalty
trusts to its stockholders beginning no later than early in the year 2000.  The
Company also adopted a stockholder rights plan.

     "We plan to attain our goals for 1999 of $4.00 cash flow per share and 36
Mcfe per share," stated Bob R. Simpson, Cross Timbers' Chairman and CEO.  "After
achieving those goals, our size will make growing at our historic rate
increasingly more difficult.  In order to continue our outstanding growth after
1999 and to unlock the intrinsic value of our premium oil and gas assets, we
plan to systematically distribute selected assets affecting 30 to 40% of the
Company's total assets in the form of royalty trusts beginning no later than
early in the year 2000.  Capital structure decisions and operating strategies
over the coming months will be consistent with this plan.

     "We believe that long-lived oil and gas reserves with significant upside
potential and name recognition achieve optimum capitalization rates when held in
the form of publicly traded royalty trusts," Simpson added.  "Management has
previously formed three royalty trusts: the San Juan Basin Royalty Trust, the
Permian Basin Royalty Trust and Cross Timbers Royalty Trust.  All of these
trusts are listed on the NYSE and continue to trade at premiums to exploration
and production companies.

     "Our Board believes that the Company's premium quality oil and gas assets
are significantly undervalued and that this plan will achieve values in excess
of double our current stock price," Simpson concluded.

     The Company's  Board of Directors also approved the declaration of a
dividend distribution of one Preferred Share Purchase Right on each outstanding
share of its Common Stock.  Each Right will entitle shareholders to buy one one-
thousandth of a share of newly created Series A Junior Participating Preferred
Stock of the Company at an exercise price of $80.  The Rights will be
exercisable if a person or group hereafter acquires 15% or more of the Common
Stock of the Company or announces a tender offer for 15% or more of the Common
Stock.  The Board of Directors will be entitled to redeem the Rights at one cent
per Right at any time before any such person hereafter acquires 15% or more of
the outstanding Common Stock.


                                    (more)
<PAGE>
 
PAGE 2 
CROSS TIMBERS OIL PLANS TO DISTRIBUTE ROYALTY TRUSTS; ADOPTS STOCKHOLDER RIGHTS 
PLAN

     The Rights are not being distributed in response to any specific effort to
acquire the Company.  The Rights are designed to assure that all shareholders of
the Company receive fair and equal treatment in the event of any proposed
takeover of the Company and to guard against partial tender offers, open market
accumulations and other tactics designed to gain control of the Company without
paying all shareholders a fair price.

     If a person hereafter acquires 15% or more of the outstanding Common Stock
of the Company, each Right will entitle its holder to purchase, at the Right's
exercise price, a number of shares of Common Stock having a market value at that
time of twice the Right's exercise price. Rights held by the 15% holder will
become void and will not be exercisable to purchase shares at the bargain
purchase price.  If the Company is acquired in a merger or other business
combination transaction after a person acquires 15% or more of the Company's
Common Stock, each Right will entitle its holder to purchase, at the Right's
then-current exercise price, a number of the acquiring company's common shares
having a market value at that time of twice the Right's exercise price.

     The dividend distribution will be payable to shareholders of record on
September 15, 1998. The Rights will expire in ten years.  The Rights
distribution is not taxable to shareholders.

     Cross Timbers Oil Company is engaged in the acquisition, exploitation and
development of quality, long-lived producing oil and gas properties.  The
Company, whose predecessors were established in 1986, completed its initial
public offering in May 1993.  Its properties are concentrated in Texas,
Oklahoma, Kansas, New Mexico and Wyoming.


CONTACT:   LOUIS G. BALDWIN
           SENIOR VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
           CROSS TIMBERS OIL COMPANY
           (817)  870-2800

This release can be found at the Company Web site at WWW.CROSSTIMBERS.COM

     Statements concerning future production, development expenditures, market
values and cash flow are forward-looking statements.  These statements are based
on assumptions concerning commodity prices, drilling results and production
costs that management believes are reasonable based on currently available
information; however, management's assumptions and the Company's future
performance are both subject to a wide range of business risks, and there is no
assurance that these goals and projections can or will be met. Further
information is available in the Company's filings with the Securities and
Exchange 


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CROSS TIMBERS OIL PLANS TO DISTRIBUTE ROYALTY TRUSTS; ADOPTS STOCKHOLDER RIGHTS 
PLAN

Commission, which are incorporated by this reference as though fully
set forth herein.


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