BROWN TOM INC /DE
SC 13D, 1999-07-12
CRUDE PETROLEUM & NATURAL GAS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                            (Amendment No. ________)*



                                 Tom Brown, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, par value $0.10
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    11566020
                    ----------------------------------------
                                 (CUSIP Number)

                                Brigitte M. Dewez
                               Corporate Secretary
                         Union Oil Company of California
                        2141 Rosecrans Avenue, Suite 4000
                              El Segundo, CA 90245
                                 (310) 726-7600
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                  July 2, 1999
             ------------------------------------------------------
                  (Date of Event which Requires Filing of this
                                   Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box /_/.

Check the following box if a fee is being paid with the statement /_/. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

NOTE: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



<PAGE>



                                  SCHEDULE 13D

- -------------------------                           ----------------------------
CUSIP No.                                                     Page 2 of 12 pages
- -------------------------                           ----------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Union Oil Company of California, a California corporation  95-1315450
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)   /X/

                                                                    (b)   /_/
- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
          00 1
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                        /X/
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
          California
- --------------------------------------------------------------------------------
           NUMBER OF            7        SOLE VOTING POWER
            SHARES                        -0-
         BENEFICIALLY           ------------------------------------------------
           OWNED BY             8        SHARED VOTING POWER
             EACH                        5,800,000
           REPORTING            ------------------------------------------------
            PERSON              9        SOLE DISPOSITIVE POWER
             WITH                        -0-
                                ------------------------------------------------
                                10       SHARED DISPOSITIVE POWER
                                         5,800,000
- -------------------------------------------------------------------------------

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         5,800,000
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
         /_/
- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         16.5%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         CO
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
____________________________
              1The source of funds was the  contribution  of certain  properties
and assets to Tom Brown, Inc.



<PAGE>



SCHEDULE 13D


- -------------------------                           ----------------------------
CUSIP No.                                                     Page 3 of 12 pages
- -------------------------                           ----------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Unocal Corporation, a Delaware corporation              95-3825062
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a)  /x/

                                                                   (b)  /_/
- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
          00
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)              /X/
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware
- --------------------------------------------------------------------------------
           NUMBER OF            7        SOLE VOTING POWER
            SHARES                       -0-
         BENEFICIALLY           ------------------------------------------------
           OWNED BY             8        SHARED VOTING POWER
             EACH                        5,800,000
           REPORTING            ------------------------------------------------
            PERSON              9        SOLE DISPOSITIVE POWER
             WITH                        -0-
                                ------------------------------------------------
                                10       SHARED DISPOSITIVE POWER
                                         5,800,000
- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         5,800,000
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                   /_/
- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         16.5%
- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

          CO
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                             Page 4 of 12 pages

                         ORIGINAL REPORT ON SCHEDULE 13D


Item 1.      Security and Issuer
             -------------------

       This statement  relates to the shares (the "Shares") of common stock, par
value  $0.10 per share (the  "Common  Stock"),  of Tom Brown,  Inc.,  a Delaware
corporation  (the "Issuer"),  which has its principal  executive  offices at 508
West Wall, Suite 500, Midland, Texas 79702.

Item 2.      Identity and Background
             -----------------------
       a.    Name:                   Union Oil Company of California, a
                                     California corporation and a wholly
                                     owned subsidiary of Unocal Corporation
                                     ("Union")
       b.    Principal Business:     Oil and gas exploration and production
       c.    Principal Business
             Address:                2141 Rosecrans Avenue, Suite 4000
                                     El Segundo, CA  90245

       a.    Name:                   Unocal Corporation, a Delaware corporation
                                     ("Unocal")
       b.    Principal Business:     Oil and gas exploration and production
       c.    Principal Business
             Address:                2141 Rosecrans Avenue, Suite 4000
                                     El Segundo, CA  90245

       Attached as Appendix A is information  concerning the executive  officers
and directors of Union and Unocal required to be disclosed in response to Item 2
and General Instruction C to Schedule 13D. Such executive officers and directors
may be deemed,  but are not  conceded  to be,  controlling  persons of Union and
Unocal.  Collectively,  Union and  Unocal  are  hereinafter  referred  to as the
"Reporting Persons."

             (d)  During  the past five  years,  Union has been  convicted  of a
number of misdemeanor  criminal  violations.  These cases usually involved minor
violations  of  state  or  local  environmental  laws.  However,  two  of  these
misdemeanor  convictions were significant.  In 1994, Union plead no contest to a
number of  misdemeanor  violations of  California  statutes  which  prohibit the
discharge of  petroleum  into the  environment.  The case was filed in Municipal
Court for the County of San Luis Obispo,  California.  Fines and civil penalties
in excess of $1,000,000 were paid to resolve the  violations.  On July 19, 1995,
Union plead no contest to a number of misdemeanor violations of California state
laws which  prohibit the unlawful  discharge of airborne  contaminants  into the
environment.  The case was filed in  Municipal  Court  for the  County of Contra
Costa,  California.  A fine of $951,000 was paid to resolve the  violations.  In
addition,  civil  penalties in the amount of $2,050,000 were paid in a companion
civil case.

       During  the  past  five  years,  neither  Unocal  nor any of the  persons
referred to in Appendix A has been convicted in a criminal proceeding (excluding
traffic violations and similar misdemeanors).

             (e) To the best knowledge of each Reporting Person,  none of Union,
Unocal nor any of the persons  referred to in Appendix A has been the subject of
a civil  judgment,  decree or final order  enjoining  future  violations  of, or
prohibiting or mandating activities subject to, Federal or State securities laws
or finding any violation with respect to such laws, during the last five years.



<PAGE>


                                                             Page 5 of 12 pages

             (f)   All persons named in Appendix A are citizens of the United
States.

Item 3.      Source and Amount of Funds or Other Consideration
             -------------------------------------------------

       On July 2, 1999,  Union  closed a  transaction  pursuant to which it sold
certain  properties and assets valued at approximately $76 million to the Issuer
in exchange for 5,800,000 shares of Common Stock and $5 million in cash.

Item 4.      Purpose of Transaction
             ----------------------

       Union  purchased  the  shares of Common  Stock  reported  herein  for the
purpose  of  investment.  Under  the Stock  Ownership  and  Registration  Rights
Agreement,  dated as of June 29, 1999  between  Union and the Issuer,  a copy of
which is attached hereto as Exhibit B (the "Stock Ownership  Agreement"),  Union
retains the absolute right to vote its shares of Common Stock as it individually
determines  except  as  otherwise  described  in Item 6 hereof  or in the  Stock
Ownership Agreement. With respect to plans or proposals that Union may have that
relate to any change in the present  board of  directors  or  management  of the
Issuer,  including  Union's  right  to  designate  one  member  of the  board of
directors  of  the  Issuer,  please  see  Article  III of  the  Stock  Ownership
Agreement.  Subject to the Stock Ownership Agreement,  Union may make additional
purchases of Common Stock either in the open market or in private transactions.

Item 5.      Interest in Securities of the Issuer
             ------------------------------------

       (a) There were 35,144,489  shares of Common Stock  outstanding as of July
2,  1999.  The  Reporting  Persons  are  deemed to be the  beneficial  owners of
5,800,000 shares of Common Stock,  which constitute  approximately  16.5% of the
total issued and outstanding Common Stock as of July 2, 1999.

       (b)  Union  is a wholly  owned  subsidiary  of  Unocal  Corporation,  and
therefore,  Unocal may be deemed to control Union. Thus, the two entities may be
deemed to share voting power and investment power with respect to the Shares.

       (c)  Except  for  the  purchase  of the  5,800,000  shares,  to the  best
knowledge of each Reporting Person,  none of Union, Unocal nor any person listed
on Appendix A has effected  any  transactions  in the Shares  during the past 60
days.

       (d) To the best of the knowledge of the Reporting Persons, none of Union,
Unocal nor any person listed on Appendix A beneficially owns any Common Stock of
the  Issuer  except as set forth  above.  To the best of the  knowledge  of each
Reporting  Person,  no persons  other than Union has the right to receive or the
power to direct the receipt of dividends from, or the proceeds from the sale of,
the shares of Common Stock beneficially owned by the Reporting Persons.

       (e)   Not applicable.




<PAGE>


                                                              Page 6 of 12 pages

Item 6.      Contracts, Arrangements, Understandings or Relationships with
             respect to Securities of the Issuer
             -------------------------------------------------------------------

       The Shares acquired by Union were acquired in a private placement and are
restricted securities.  Pursuant to the Stock Ownership Agreement, Union retains
the  absolute  right to vote  its  shares  of  Common  Stock as it  individually
determines  except  that for so long as Union  owns  greater  than 10% of Common
Stock, it must vote its shares in favor of the director nominees  recommended by
the management of the Issuer. In addition,  certain transfer  restrictions,  and
registration  rights granted by the Issuer are set forth in the Stock  Ownership
Agreement, a copy of which is included as Exhibit B to this Schedule 13D.

Item 7.      Material to be filed as Exhibits
             --------------------------------

       Exhibit "A" - Agreement of Joint Filing.
       Exhibit "B" - Stock Ownership and Registration Rights Agreement.

                                                     SIGNATURE

       After reasonable inquiry and to the best of our knowledge and belief, the
undersigned  certify that the  information  set forth in this statement is true,
complete and correct.

Date: July 12, 1999




                                          Unocal Corporation
                                          Union Oil Company of California



                                           By:  /s/ Joe D. Cecil
                                              ----------------------------------
                                              Name:     Joe D. Cecil
                                              Title:    Vice President,
                                                          and Comptroller




<PAGE>
                                                              Page 7 of 12 pages



                                                                      APPENDIX A

                        DIRECTORS AND EXECUTIVE OFFICERS
                       OF UNION OIL COMPANY OF CALIFORNIA

The following table sets forth the name,  business address and present principal
occupation or employment of each director and executive officer of Union. Unless
otherwise indicated below, each such person is a citizen of the United States of
America.

<TABLE>
<CAPTION>

                                                             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
                      NAME                                                 BUSINESS ADDRESS
<S>                                               <C>

Roger C. Beach                                    Director, Chairman & Chief Executive Officer

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

John F. Imle, Jr.                                 Director, Vice Chairman

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Timothy H. Ling                                   Director, Executive Vice President, North American
                                                  Energy Operations, and Chief Financial Officer

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Charles R. Williamson                             Director, Executive Vice President, International Energy
                                                  Operations

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245
</TABLE>

<PAGE>

                                                              Page 8 of 12 pages

<TABLE>
<CAPTION>

                                                             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
                      NAME                                                 BUSINESS ADDRESS
<S>                                               <C>
L.E. (Ed) Scott                                   Group Vice President, Diversified Business Group

                                                  Union Oil Company of California
                                                  376 South Valencia Ave.
                                                  Brea, CA  92823

Dennis P.R. Codon                                 Vice President, Chief Legal Officer and General Counsel

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Joe D. Cecil                                      Vice President and Comptroller

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Joseph A. Householder                             Vice President, Corporate Development, and Assistant
                                                  Chief Financial Officer

                                                  Union Oil Company of California
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

William T. Wilson                                 Vice President, Transportation, Commodity Trading and
                                                  Risk Management

                                                  Union Oil Company of California
                                                  14141 Southwest Freeway
                                                  Sugar Land, TX 77478
</TABLE>


<PAGE>

                                                              Page 9 of 12 pages


                        DIRECTORS AND EXECUTIVE OFFICERS
                              OF UNOCAL CORPORATION

The following table sets forth the name,  business address and present principal
occupation  or  employment  of each  director and  executive  officer of Unocal.
Unless otherwise  indicated  below,  each such person is a citizen of the United
States of America.
<TABLE>
<CAPTION>


                                                             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
                      NAME                                                 BUSINESS ADDRESS
<S>                                               <C>

Roger C. Beach                                    Director, Chairman & Chief Executive Officer

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

John F. Imle, Jr.                                 Director, Vice Chairman

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Timothy H. Ling                                   Executive Vice President, North American
                                                  Energy Operations, and Chief Financial Officer

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Charles R. Williamson                             Executive Vice President, International Energy
                                                  Operations

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

L.E. (Ed) Scott                                   Group Vice President, Diversified Business Group

                                                  Unocal Corporation
                                                  376 South Valencia Ave.
                                                  Brea, CA  92823

</TABLE>


<PAGE>
                                                             Page 10 of 12 pages
<TABLE>
<CAPTION>


                                                             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
                      NAME                                                 BUSINESS ADDRESS
<S>                                              <C>

Dennis P.R. Codon                                 Vice President, Chief Legal Officer and General Counsel

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Joe D. Cecil                                      Vice President and Comptroller

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

Joseph A. Householder                             Vice President, Corporate Development, and Assistant
                                                  Chief Financial Officer

                                                  Unocal Corporation
                                                  2141 Rosecrans Avenue
                                                  Suite 4000
                                                  El Segundo, CA 90245

William T. Wilson                                 Vice President, Transportation, Commodity Trading and
                                                  Risk Management

                                                  Unocal Corporation
                                                  14141 Southwest Freeway
                                                  Sugar Land, TX 77478

John W. Amerman                                   Former Chairman of the Board and Chief Executive
Director                                          Officer of Mattel, Inc.

                                                  2101 Rosecrans Avenue
                                                  Suite 6280
                                                  El Segundo, CA 90245


</TABLE>


<PAGE>

                                                             Page 11 of 12 pages
<TABLE>
<CAPTION>


                                                             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
                      NAME                                                 BUSINESS ADDRESS
<S>                                               <C>

John W. Creighton, Jr.                            Former President and Chief Executive Officer of
Director                                          Weyerhaeuser Company

                                                  Madrona Investment Group
                                                  1000 Second Avenue
                                                  Suite 3700
                                                  Seattle, WA 98104
James W. Crownover                                Former Director of McKinsey & Company, Inc.
Director
                                                  c/o McKinsey & Company, Inc.
                                                  909 Fannin
                                                  Suite 3675
                                                  Houston, Texas 77010

Frank C. Herringer                                Chairman and Chief Executive Officer of Transamerica
Director                                          Corporation

                                                  Transamerica Corporation
                                                  600 Montgomery Street
                                                  San Francisco, CA  94111

Donald B. Rice                                    President and Chief Executive Officer of UroGenesys,
Director                                          Inc.

                                                  UroGenesys, Inc.
                                                  1701 Colorado Avenue
                                                  Santa Monica, CA  90404

Kevin W. Sharer                                   President and Chief Operating Officer of Amgen, Inc.
Director
                                                  Amgen Inc.
                                                  One Amgen Center
                                                  Thousand Oaks, CA  91320-1789

Marina v. N. Whitman                              Professor of Business Administration and Public Policy,
Director                                          University of Michigan

                                                  Institute of Public Policy Studies
                                                  University of Michigan
                                                  411 Lorch Hall
                                                  Ann Arbor, MI  48109-1220

</TABLE>



<PAGE>



                                                            Page 12 of 12 pages

                                INDEX TO EXHIBITS



      Item                                         Description
      ----                                         -----------
Exhibit A        Agreement of Joint Filing
Exhibit B        Stock Ownership and Registration Rights Agreement






<PAGE>


                                                                   EXHIBIT A


                    Agreement re Joint Filing of Schedule 13D
                    -----------------------------------------

         The undersigned  hereby agree that they are filing jointly  pursuant to
Rule 13d-1 of the Securities  Exchange Act of 1934 the statement  dated July 12,
1999,  containing  the  information  required by Schedule 13D, for the 5,800,000
Shares of the  Common  Stock of Tom  Brown,  Inc.  held by Union Oil  Company of
California.

Date:  July 12, 1999


                                             Unocal Corporation
                                             Union Oil Company of California



                                              By:/s/ Joe D. Cecil
                                                 ------------------------------
                                                 Name:  Joe D. Cecil
                                                 Title: Vice President,
                                                          and Comptroller



                                       A-1

<PAGE>



                                                                 EXHIBIT B
                                                                  --------


                                 STOCK OWNERSHIP

                                       AND

                          REGISTRATION RIGHTS AGREEMENT

                                     between

                         UNION OIL COMPANY OF CALIFORNIA

                                       and

                                 TOM BROWN, INC.






                                  June 29, 1999










<PAGE>

<TABLE>
<CAPTION>


                                      INDEX

                               STOCK OWNERSHIP AND
                          REGISTRATION RIGHTS AGREEMENT
<S>     <C>                                                                                                     <C>
ARTICLE I

Transfer Restrictions with Respect to TBI Common Stock...........................................................1
         Section 1.1      Restrictions on Resale or other Distribution...........................................1
         Section 1.2      Acceleration Event.....................................................................3
         Section 1.3      Undertaking to File Reports and Cooperate in Rule 144 Transactions.....................3
         Section 1.4      Applicability of Article I.............................................................3
ARTICLE II

Voting, Stock Legends............................................................................................4
         Section 2.1      Right to Vote Shares...................................................................4
         Section 2.2      Legends................................................................................4
ARTICLE III

Board Representation.............................................................................................4
         Section 3.1      Board Seat; Nomination.................................................................4
         Section 3.2      Unocal Representative..................................................................5
ARTICLE IV

Acquisition Rights; Percentage Retention.........................................................................5
         Section 4.1      Acquisition Rights.....................................................................5
         Section 4.2      Percentage Retention...................................................................6
ARTICLE V

Standstill.......................................................................................................6
ARTICLE VI

Registration Rights..............................................................................................7
         Section 6.1      Demand Registrations...................................................................7
         Section 6.2      Piggyback Registrations...............................................................10
         Section 6.3      Holdback Agreements...................................................................11
         Section 6.4      Information to be Furnished by Unocal.................................................14
         Section 6.5      Suspension of Offering Pending Prospectus Supplement or Amendment
          ......................................................................................................15
         Section 6.6      Registration Expenses.................................................................15
         Section 6.7      Underwritten Offerings................................................................15
         Section 6.8      Indemnification.......................................................................16
         Section 6.9      Third Party Registration Rights.......................................................19

</TABLE>

                                       -i-

<PAGE>


<TABLE>
<S>      <C>               <C>                                                                                  <C>

ARTICLE VII

Miscellaneous....................................................................................................19
         Section 7.1       Injunctive Relief.....................................................................19
         Section 7.2       Severability..........................................................................19
         Section 7.3       Amendments............................................................................19
         Section 7.4       Descriptive Headings..................................................................19
         Section 7.5       Counterparts..........................................................................19
         Section 7.6       Notices...............................................................................19
         Section 7.7       Law Applicable........................................................................20
         Section 7.8       Successors and Assigns................................................................20


</TABLE>

                                      -ii-

<PAGE>



                               STOCK OWNERSHIP AND
                          REGISTRATION RIGHTS AGREEMENT
                                     BETWEEN
                         UNION OIL COMPANY OF CALIFORNIA
                                       AND
                                 TOM BROWN, INC.

         THIS  STOCK   OWNERSHIP  AND   REGISTRATION   RIGHTS   AGREEMENT   (the
"Agreement"),  dated as of June 29, 1999 (the "Closing Date"),  is between UNION
OIL COMPANY OF CALIFORNIA,  a California corporation ("Unocal"),  and TOM BROWN,
INC., a Delaware corporation ("TBI").

                              W I T N E S S E T H:

         WHEREAS, Unocal and TBI have entered into a Purchase and Sale Agreement
(the "Purchase and Sale Agreement")  pursuant to which, subject to the terms and
conditions  set  forth in the  Purchase  and Sale  Agreement,  Unocal  will sell
certain   assets  (the   "Assets")  and  TBI  will  purchase  such  Assets  (the
"Acquisition"); and

         WHEREAS,  as part of the consideration  for the Assets,  TBI will issue
and sell to Unocal 5,800,000 shares as adjusted to reflect any stock dividend or
other adjustment (the "TBI Shares") of fully-paid,  non-assessable common stock,
par value $.10 per share of TBI ("TBI Common Stock"), in the manner specified in
the Purchase and Sale Agreement; and

         WHEREAS, as a condition to the transactions under the Purchase and Sale
Agreement,  Unocal  and TBI have  agreed,  upon the  terms  and  subject  to the
conditions  set forth herein,  to enter into this  Agreement with respect to the
TBI Common Stock and the  respective  obligations of TBI and Unocal while Unocal
owns the TBI Common Stock;

         NOW,  THEREFORE,   in  consideration  of  the  mutual  representations,
warranties  and  covenants  contained  herein  and  in  the  Purchase  and  Sale
Agreement,  and for other  good and  valuable  consideration,  the  receipt  and
sufficiency of which are hereby acknowledged,  the parties hereto,  intending to
be legally bound, agree as follows:

                                    ARTICLE I

             Transfer Restrictions with Respect to TBI Common Stock

                  Section 1.1 Restrictions on Resale or other Distribution. As a
stockholder of TBI, and with respect to the TBI Common Stock it owns,  Unocal is
free to sell,  transfer  or  dispose of its  shares as it  desires,  in its sole
discretion, subject only to the following restrictions:



                                       -1-

<PAGE>



         (a) Unocal  covenants and agrees  (except as provided in Section 1.1(c)
below) that for a period of  twenty-four  (24) months after the Closing Date, it
will not sell or transfer any  beneficial  interest in, or otherwise  dispose of
any TBI Common Stock,  except  pursuant to the exercise of  registration  rights
afforded Unocal herein or otherwise approved by a majority of the non-interested
members of the TBI Board of Directors (the "TBI Board").

         (b) After  twenty-four (24) months  following the Closing Date,  Unocal
may sell,  transfer or  otherwise  convey any TBI Common Stock held by it (i) in
accordance  with the  registration  rights  provided  herein,  (ii) in any other
manner, to any other party who Unocal reasonably  believes,  after diligent good
faith inquiry and consultation  with the corporate  secretary of TBI who, by the
end  of  the  business  day  following  such  consultation,   does  not  provide
information  to the  contrary,  does not prior to or as a result  of such  sale,
transfer or  conveyance,  own an interest  equal to or greater  than ten percent
(10%) of the  outstanding  TBI  Common  Stock or  (iii) in a  transaction  which
receives the prior approval of a majority of the  non-interested  members of the
TBI Board.

         (c)      The restrictions in Sections 1.1(a) and 1.1(b) shall not be
 applicable to:

                  (i) any sale at any time pursuant to a tender offer, merger or
business  combination by a person unaffiliated with Unocal,  which offer, merger
or business combination has been recommended or approved by the TBI Board; or

                  (ii)     if the proposed sale, transfer or disposition occurs
         pursuant to:

                           (a)      any transfer of all or part of such TBI
         Common Stock pursuant to the rights afforded to Unocal under Article VI
         below;

                           (b)      a pro rata rights offering or pro rata
         distribution to all holders of Unocal common stock;

                           (c)     Rule 144 of the  General  Rules  and  Regula-
         tions promulgated   by  the   Securities   and   Exchange   Commission
         (the "Commission")  under  the  Securities  Act of  1933,  as  amended
         (the "Securities Act") or any successor rule or regulation thereto;

                           (d)      a pledge of or the granting of a security
         interest in such shares to a lender to secure a bona fide loan,
         guarantee or financial support to the pledgor;

                           (e)  legislation,  a  final  decree  of  a  court  of
         competent  jurisdiction  or a governmental  order or demand,  requiring
         divestiture  of the TBI Common  Stock,  subject to the  limitation  set
         forth in Section 1.1(b)(ii) above;

                           (f) a transfer of TBI Common  Stock  among  Unocal or
         any Unocal  subsidiary  in which  Unocal  beneficially  owns 80% of the
         voting power of the subsidiary's capital stock (a "Unocal Subsidiary"),
         so long as (i) such Unocal Subsidiary shall have been


                                       -2-

<PAGE>



         required,  prior to the transfer  thereto,  to execute a counterpart of
         this Agreement agreeing to the obligations and restrictions  applicable
         to Unocal, (ii) at least 10-day's notice of the transfer shall be given
         to TBI and (iii) Unocal has executed a covenant to retain not less than
         80%  of  the  voting  power  of  such  Subsidiary's  capital  stock  (a
         "Permitted Unocal Subsidiary")

                           (g)      a sale, transfer, or disposition following
         an Acceleration Event (as defined in Section 1.2 below); or

                           (h) a sale,  transfer  or  disposition  which is made
         after  three (3) years  following  the date Unocal  relinquishes  or no
         longer has a seat on the TBI Board.

                  Section  1.2  Acceleration  Event.  For the  purposes  of this
Agreement,  "Acceleration Event" shall mean (i) the acquisition by any person or
group (within the contemplation of Rule 13d-1 of the Securities  Exchange Act of
1934, as amended (the "Exchange Act")) of beneficial  ownership or voting rights
with  respect  to more  than  50% of the  voting  securities  of TBI;  (ii)  the
consummation  of any  transaction  that  triggers the  provisions  of the Rights
Agreement by and between Tom Brown,  Inc. and  American  Stock  Transfer & Trust
Company of New York,  dated  March 5, 1991 (the "TBI  Rights  Plan");  (iii) the
removal and the replacement (at any annual or special meeting of stockholders or
otherwise) of a majority of the then current  directors of TBI; (iv) the sale or
transfer of all or  substantially  all of the assets of TBI or (v) the execution
by TBI of an agreement  which would,  directly or indirectly,  result in, or the
approval  of the TBI  Board or  stockholders  of, a  transaction  referenced  in
subsections (i), (ii), (iii) or (iv) above.

                  Section 1.3  Undertaking to File Reports and Cooperate in Rule
144 Transactions.  For as long as Unocal or any Unocal Subsidiary shall continue
to hold any TBI Common Stock,  TBI shall file,  on a timely  basis,  all annual,
quarterly  and other  reports  required to be filed by it under  Sections 13 and
15(d) of the Exchange Act, and the General Rules and Regulations  promulgated by
the Commission thereunder,  as amended from time to time during the term of this
Agreement.  In the event of any proposed sale or transfer of TBI Common Stock by
Unocal or a Unocal  Subsidiary,  TBI shall  cooperate with Unocal or such Unocal
Subsidiary so as to enable such sales to be made in accordance  with  applicable
laws, rules and regulations,  the requirements of TBI's transfer agents, and the
reasonable requirements of the broker through which the sales are proposed to be
executed,  and shall,  upon  request  and  subject to  applicable  law,  furnish
unlegended  certificates  representing  TBI  Common  Stock in such  numbers  and
denominations as Unocal or such Unocal  Subsidiary shall reasonably  require for
delivery pursuant to such sales.

                  Section  1.4  Applicability  of Article I. The  provisions  in
Article I shall  cease to be  applicable  at such time as Unocal has sold all of
the TBI Shares and TBI Common  Stock  acquired  pursuant to Sections  4.1 or 4.2
hereof in accordance with or in a manner  permitted under the provisions of this
Agreement.


                                       -3-

<PAGE>




                                   ARTICLE II

                              VOTING, STOCK LEGENDS

                  Section 2.1 Right to Vote  Shares.  As a  stockholder  of TBI,
Unocal will be free,  notwithstanding any other provision in this Agreement,  to
vote TBI Common Stock held by it in connection with any vote of the stockholders
of TBI provided that for so long as Unocal continues to own shares of TBI Common
Stock  representing in excess of 10% of the issued and outstanding shares of TBI
Common  Stock,  Unocal shall vote its shares in favor of the  director  nominees
recommended  by TBI  management.  This  provision is not intended,  however,  to
absolve Unocal of any obligations it may have to the other  stockholders of TBI;
provided  that  there  should be no  inference  made from  this  provision  that
obligations,  of any  kind  or  nature,  are  owing  from  Unocal  to any  other
stockholder of TBI.

                  Section  2.2  Legends.  (a)  To  assist  in  effectuating  the
provisions of this  Agreement,  Unocal  hereby  consents to the placement of the
following legend on all certificates  representing ownership of TBI Common Stock
until such shares have been sold,  transferred or disposed of in accordance with
the requirements of Article I hereof:

                           THE  SHARES   REPRESENTED  BY  THIS  CERTIFICATE  ARE
         SUBJECT TO THE PROVISIONS OF A STOCK OWNERSHIP AND REGISTRATION  RIGHTS
         AGREEMENT  DATED JUNE 29,  1999  BETWEEN  TBI AND UNOCAL AND MAY NOT BE
         SOLD,  TRANSFERRED  OR  OTHERWISE  DISPOSED  OF  EXCEPT  IN  ACCORDANCE
         THEREWITH.  A COPY OF SAID  AGREEMENT  IS ON FILE AT THE  OFFICE OF THE
         SECRETARY OF TBI.

         (b) TBI hereby agrees to remove the foregoing  legend promptly upon the
request  of Unocal in order to permit a sale or  transfer  permitted  under this
Agreement.

                                   ARTICLE III

                              BOARD REPRESENTATION

                  Section 3.1 Board Seat; Nomination. (a) TBI agrees that, as of
the Closing Date,  TBI will increase the size of the TBI Board by one and Unocal
shall have the right to designate one person to fill the vacancy created by such
increase as soon as practicable  after the Closing Date but no more than 30 days
after the Closing  Date. If the person  designated  to fill such vacancy  should
die,  become  disabled,  resign or be removed  from  serving as a director,  TBI
agrees,  subject to applicable law, to permit Unocal to designate a successor as
a nominee to fill the vacancy created by such death, disability,  resignation or
removal.

         (b)  Unocal  shall  have a  continuing  right to  designate  a director
nominee for the TBI Board at each election of directors.  The right of Unocal to
designate a member to the TBI Board


                                       -4-

<PAGE>



shall cease at such time after the Closing Date as Unocal or a Permitted  Unocal
Subsidiary as defined in Section  1.1(c)(ii)(f)  is no longer a beneficial owner
(as defined in Rule 13d-3 of the General Rules and  Regulations  promulgated  by
the  Commission  under the Exchange Act) of at least ten percent  (10.0%) of the
TBI Common  Stock  outstanding  at the time the  determination  is made.  Unocal
hereby  undertakes  and agrees that not later than  twenty  (20) days  following
written  notice  from TBI  requesting  such  information  to  furnish to TBI for
inclusion in the proxy  statement  the name of the designee to serve as a member
of the TBI Board and such other  information with respect to such designee as is
required to comply with the applicable  requirements of Items 401 and 404(a) and
(c) of Regulation S-K with respect to such  designee.  If Unocal fails to timely
provide such  information,  Unocal will be deemed to have forfeited its right to
designate a director under this Article III, until the next succeeding  election
of directors to the TBI Board pursuant to this Agreement.  For so long as Unocal
or a Permitted  Unocal  Subsidiary  continues to retain such 10% ownership,  TBI
agrees to and shall include Unocal's designated director nominee in the slate of
directors  recommended to the  stockholders  by the TBI Board in accordance with
this  Article  III  and  shall  endorse  and  recommend   such  nominee  to  the
stockholders of TBI.

                  Section  3.2  Unocal   Representative.   Notwithstanding   any
provision herein to the contrary,  Unocal's representative on the TBI Board will
be free to take such  actions  as are  consistent  with  discharging  his or her
duties to TBI and its stockholders, in his or her capacity as a director of TBI.

                                   ARTICLE IV

                    ACQUISITION RIGHTS; PERCENTAGE RETENTION

                  Section 4.1 Acquisition  Rights.  Unocal shall not, during the
term of this Agreement,  acquire any additional shares of TBI Common Stock other
than the TBI Shares,  except:  (i) for purchases approved by the majority of the
non-interested  members  of  the  TBI  Board,  (ii)  purchases  covered  by  the
percentage  retention  exceptions  described  in Section 4.2 below,  (iii) for a
period of six months  following the Closing Date,  purchases on the open market,
from third parties or  otherwise,  so long as Unocal does not at the end of such
period or  thereafter  own,  of record or  beneficially,  more than the  Maximum
Percentage  Ownership (as defined below) of the issued and outstanding shares of
TBI Common  Stock and (iv) after the  expiration  of six  months  following  the
Closing  Date,  purchases  of  additional  shares of TBI Common  Stock up to the
Maximum Percentage Ownership, if Unocal is advised in writing by its independent
public  accountants that additional  shares of TBI Common Stock are required for
Unocal to receive equity accounting treatment. To the extent practicable, Unocal
shall provide  written notice to TBI prior to any  acquisition  pursuant to this
paragraph,  and, in any event,  Unocal shall provide such notice within ten (10)
days  following  such  acquisition.  For purposes  hereof,  "Maximum  Percentage
Ownership"  shall mean 19.5% less the  percentage  interest  represented  by TBI
Common Stock,  if any, sold by Unocal.  The provisions of this Section 4.1 shall
continue  until the  earlier of (i) such time as Unocal has sold or  disposed of
all of the TBI Shares and TBI Common Stock acquired  pursuant to Sections 4.1 or
4.2 hereof or (ii) termination of the Standstill set forth in Section 5.1(b).


                                       -5-

<PAGE>



                  Section 4.2  Percentage Retention.

                  (a) In the event that TBI shall, after the Closing Date, issue
or sell or transfer  additional  shares of TBI Common Stock (including  treasury
shares), Unocal would have the right to maintain its percentage ownership of TBI
Common  Stock at the  level it was  immediately  prior to the time of each  such
issuance, sale or transfer through (i) acquiring shares of TBI Common Stock from
TBI at the price and on the same terms as the third party  purchaser  (or if the
issuance  price is other than cash or the terms are such as cannot be  satisfied
by Unocal  then for cash at an agreed  value  which will not exceed the  average
trading  price for TBI Common Stock over the twenty (20) trading days  preceding
the  earlier of the  execution  of  agreements  to  consummate  such third party
transaction and public notice by TBI of such third party transaction),  Unocal's
election  to  purchase  such  shares of TBI Common  Stock from TBI to be made by
Unocal at any time  following  public  notice of the  execution  of a definitive
agreement  respecting the transaction but in any event, within ten (10) business
days  following  receipt  of  written  notice  from  TBI of its  execution  of a
definitive  agreement  regarding  the  transaction  or (ii) the  purchase of TBI
Common Stock in the open market,  provided such  acquisition  is made within six
(6) months of such  issuance or sale.  TBI shall  provide  Unocal  with  written
notice of the execution of such a definitive agreement within 48 hours following
the execution thereof.

                  (b)  Notwithstanding   subsection  (a)  above,  following  any
acquisition  by a third  party of shares of TBI  Common  Stock  representing  in
excess of 50% of the issued  and  outstanding  shares of TBI  Common  Stock in a
transaction in which TBI survives as an ongoing  entity,  the right of Unocal to
acquire  shares of TBI Common Stock  directly  from TBI  pursuant to  subsection
(a)(i) above shall lapse provided such transaction  shall not restrict or impact
Unocal's  right to acquire  shares of TBI Common Stock from third  parties or on
the open market as reflected in subsection (a)(ii) above.

                                    ARTICLE V

                                   STANDSTILL

                  Section  5.1  Standstill.  (a) Except as  provided  in Section
5.1(d), Unocal will not, and will cause each of its Affiliates not to, singly or
as part of a "partnership,  limited  partnership,  syndicate or other group" (as
those terms are used within the meaning of Section 13(d)(3) of the Exchange Act,
which  meanings  shall apply for all  purposes of this  Agreement),  directly or
indirectly, through one or more intermediaries or otherwise:

                  (i)  except as  provided  in  Article  IV,  acquire,  offer or
propose  to  acquire,  or  agree to  acquire,  by  purchase  or  otherwise,  any
securities  entitled  to, or that may be  entitled  to,  vote  generally  in the
election  of  the  TBI  Board  or  any   affiliate  of  TBI  ("TBI   Affiliate")
(collectively,  "Voting Securities") or any direct or indirect rights or options
to acquire  (through  purchase,  exchange,  conversion or otherwise)  any Voting
Securities;



                                       -6-

<PAGE>



                  (ii) make, or in any way participate in, any "solicitation" or
"proxies" (as such terms are defined or used in  Regulation  14A of the Exchange
Act) with respect to the Voting Securities (including by the execution of action
by written consent),  become a "participant" in any "election  contest" (as such
terms are defined or used in Rule 14a-11 of the  Exchange  Act) with  respect to
TBI or any TBI Affiliate,  seek to advise,  encourage or influence any person or
entity with respect to the voting of any Voting  Securities  or demand a copy of
the stock ledger, list of stockholders, or other books and records of TBI or any
TBI Affiliate;

                  (iii)  participate  in or encourage the formation of any group
which owns or seeks or offers to acquire  beneficial  ownership of securities or
assets of TBI or any TBI  Affiliates  or rights to acquire  such  securities  or
assets or which seeks or offers to affect control of TBI or any TBI Affiliate or
for the purpose of circumventing any provision of this Agreement; or

                  (iv) except as may be provided in Section 2.1 with  respect to
voting on matters submitted to TBI stockholders for a vote, otherwise act, alone
or in concert with others (including by providing  financing for another party),
to seek or offer to control or influence, in any manner, the management, the TBI
Board or policies of TBI or any TBI Affiliate.

         (b) The standstill  provisions in Section 5.1(a) shall remain in effect
until the earlier of (i) three (3) years after Unocal  relinquishes or no longer
has its director's seat on the TBI Board or (ii) a Change of Control of TBI. For
the purposes  hereof,  "Change of Control" shall mean either (i) the acquisition
by any person or group (within the  contemplation  of Rule 13d-1 of the Exchange
Act) of beneficial  ownership of more than 50% of the voting  securities of TBI;
(ii) the consummation of any transaction that triggers the provisions of the TBI
Rights Plan in effect at the time of the consummation of such transaction; (iii)
the removal and the replacement at any annual or special meeting of stockholders
of a majority of the current  directors  of TBI; or (iv) the sale or transfer of
all or substantially all of the assets of TBI.

         (c) The standstill  provisions in Section 5.1 above shall supersede and
replace the  standstill  provisions  contained in that  certain  Confidentiality
Agreement  dated June 16, 1998 between  Unocal and TBI pertaining to the receipt
by Unocal of certain information relating to TBI.

         (d)  Notwithstanding  any  other  provisions  in this  Article  V, as a
stockholder of TBI, and with respect to the TBI Shares or such additional shares
of TBI Common Stock that it may acquire in  accordance  with Article IV,  Unocal
may freely sell,  transfer or dispose of such shares as it desires,  in its sole
discretion (subject only to the restrictions in Article I).

                                   ARTICLE VI

                               REGISTRATION RIGHTS

                  Section  6.1 Demand  Registrations.  (a) At any time after
 twenty-four (24) months  following  the  Closing  Date,  Unocal by written
 notice to TBI (a "Demand Notice") may require TBI


                                       -7-

<PAGE>



to effect a registration (a "Demand Registration") of Registrable Securities (as
defined below) under the Securities Act for sale; provided,  that (i) Unocal may
not require TBI to effect more than two (2) Demand  Registrations,  and (ii) the
aggregate number of shares of Registrable  Securities  required to be registered
in each Demand  Registration shall be at least 2 million shares. Upon receipt of
any Demand  Notice,  TBI will give  prompt  written  notice of the  request  for
registration to each holder of Registrable  Securities,  and TBI will include in
the Demand  Registration  all  Registrable  Securities with respect to which TBI
receives  written  requests for  inclusion  therein  during the thirty (30) days
after notice is given.  "Registrable  Securities" means (i) the TBI Shares, (ii)
any other shares of TBI Common Stock which  Unocal  acquires as permitted  under
this Agreement and (iii) any  securities  issued or issuable with respect to any
such common stock by way of stock dividend or stock split or in connection  with
a  combination  of  shares,  recapitalization,  merger,  consolidation  or other
reorganization   or   otherwise.   The  terms   "register,"   "registered"   and
"registration" as used in this Agreement shall refer to a registration  effected
by  preparing  and  filing  a  registration  statement  in  compliance  with the
Securities  Act  and  applicable  rules  and  regulations  thereunder,  and  the
declaration or ordering of the effectiveness of such registration statement.

         (b) Registration  Statement Form. Demand Registrations shall be on such
appropriate  registration form of the Commission (i) as shall be selected by TBI
and shall be  acceptable to Unocal and (ii) as shall permit the  disposition  of
such Registrable Securities in accordance with the intended method or methods of
disposition specified in Unocal's request for such registration.

         (c) TBI may utilize form S-2 or S-3 (or any similar "short form") under
the Securities Act to effect any Demand  Registration so long as the use of such
form is  permitted  under the  Securities  Act and the  regulations  promulgated
thereunder  and the use of such a form will not (in the  reasonable  judgment of
the  participating  holders  of  Registrable  Securities)  adversely  affect the
marketing or sale price of the shares proposed to be sold in the offering.

         (d) Effective Registration Statement. A registration requested pursuant
to  Section  6.1(a)  shall not be deemed to have been  effected  and will not be
considered one of the Demand  Registrations  which may be requested  pursuant to
this  Agreement if (i) a registration  statement  with respect  thereto does not
become  effective or if the request for the Demand  Registration is withdrawn at
the  request of TBI or at the  request of Unocal  provided  if Unocal  makes the
withdrawal request,  Unocal pays the reasonable  out-of-pocket expenses incurred
by TBI with respect to such  withdrawn  offering  prior to  effectiveness,  (ii)
after it has become  effective,  it does not remain effective for a period of at
least 180 days (unless Registrable  Securities  registered  thereunder have been
sold or  disposed of prior to the  expiration  of such  180-day  period) or such
registration is interfered with by any stop order,  injunction or other order or
requirement  of the  Commission  or other  governmental  agency or court for any
reason and has not thereafter become effective,  (iii) the conditions to closing
specified in any  underwriting  agreement  entered into in connection  with such
registration  are not satisfied or waived other than by reason of the failure or
refusal  of Unocal to satisfy or  perform a  condition  to such  closing or (iv)
Unocal is not able to  register at least 2 million  shares.  Except as set forth
above,  TBI shall pay all  Registration  Expenses  (as  defined in  Section  6.7
herein) in connection with any such registration initiated but not so effected.


                                       -8-

<PAGE>



         (e) Other Securities;  Priority on Demand  Registrations.  Whenever TBI
shall effect a Demand Registration pursuant to Section 6.1(a) in connection with
an  underwritten  offering  by Unocal,  no  securities  other  than  Registrable
Securities shall be included among the securities  covered by such  registration
unless the  managing  underwriter  of such  offering  shall have advised TBI and
Unocal in writing that the inclusion of such other  securities  would not have a
material  adverse  effect  on such  offering.  In the  event  that the  managing
underwriters of a requested  Demand  Registration  advise TBI in writing that in
their  opinion  the number of  securities  proposed  to be  included in any such
registration exceeds the number of securities which can be sold in such offering
without having a material  adverse impact on the offering,  TBI shall include in
such registration only the number of Registrable Securities which in the opinion
of such underwriters can be sold without having a material adverse effect on the
offering. If the number of securities which can be sold in a Demand Registration
exceeds  the  number of shares of  securities  requested  to be sold,  TBI shall
include in such Demand  Registration  (i) first,  all of Registrable  Securities
requested to be included  therein by Unocal,  and (ii) second,  securities to be
included by TBI, and (iii) third,  other securities  requested to be included in
such registration.

         (f) Restrictions on Demand Registrations. TBI shall not be obligated to
effect any Demand  Registration  within four (4) months after the effective date
of a previous public offering of TBI Common Stock. In addition, TBI may postpone
(such  postponement is referred to herein as a "Permitted  Interruption")  for a
reasonable  period of time (not to exceed 90 days,  which may not  thereafter be
extended) the filing of a registration  statement for a Demand  Registration if,
at the time it receives a request for such registration (i) TBI is conducting an
offering of TBI Common Stock and is advised by its  investment  banker that such
offering  would be affected  adversely by the  registration  so demanded and TBI
furnishes  an officer's  certificate  to that effect or (ii) the TBI Board shall
determine  in good faith that such  offering  will  interfere  with a pending or
contemplated financing, merger, acquisition, sale of assets, recapitalization or
other similar corporate action of TBI and TBI furnishes an officer's certificate
to that  effect.  After  such  Permitted  Interruption,  TBI shall  effect  such
registration  as promptly as  practicable  without  further  request from Unocal
unless  such  request  has  been  withdrawn.  TBI  shall  not  invoke  Permitted
Interruptions  more than  twice per twelve  (12)  month  period but in any event
shall not exceed  150 days in the  aggregate.  In the event  that TBI  invokes a
Permitted  Interruption  hereunder and in the  reasonable  discretion of the TBI
Board of  Directors  the need for TBI to  continue  the  Permitted  Interruption
ceases for any reason, including, without limitation,  abandonment or completion
of the  transaction  giving  rise  to such  Permitted  Interruption,  TBI  shall
promptly provide written notice to Unocal that such Permitted Interruption is no
longer  applicable and provide  Unocal the  opportunity to then request a Demand
Registration.

         (g)  Selection of  Underwriters.  Unocal shall have the right to select
such  investment  banker(s) and manager(s) as shall be reasonably  acceptable to
TBI to  administer  the offering of  Registrable  Securities  for which a Demand
Registration  is  requested.  Unocal  and TBI shall  negotiate  the terms of the
underwriters'  fees and expenses,  the underwriting  discount and commission and
the transfer taxes, provided, however, that TBI shall not be required to pay any
fees, expenses, or other costs attributable to the Demand Registration except as
stated herein or that are otherwise not usual and customary.

                                       -9-

<PAGE>



         (h)  Acceleration  Event.  In the event of an occurrence or transaction
constituting  an  Acceleration  Event,  TBI  shall,  upon  request of Unocal and
subject to compliance with applicable law and SEC rules and regulations, proceed
(without regard to or application of any Permitted  Interruption) to immediately
register all of Unocal's  remaining  unregistered  Registrable  Securities at or
before such occurrence or the consummation of any such transaction.

                  Section 6.2 Piggyback Registrations. (a) General. Whenever TBI
proposes to register  any shares of TBI Common  Stock under the  Securities  Act
(other than registrations  solely for shares to be issued in connection with any
employee  benefit plan on Form S-8 (or any successor  form thereto) or a merger,
consolidation  or  other  business  combination  registered  on Form S-4 (or any
successor  form thereto)) and the  registration  form to be used may be used for
the registration of Registrable Securities (a "Piggyback Registration"),  at any
time after the Closing Date,  TBI shall give prompt written notice (in any event
within 10  business  days after its  receipt of notice of any  exercise of other
registration  rights) to Unocal of its  intention to effect such a  registration
and shall use commercially  reasonable  efforts to include in such  registration
all of Registrable  Securities  with respect to which TBI receives from Unocal a
written request for inclusion  therein within 20 days after Unocal's  receipt of
TBI's  notice,  which  request  shall  specify  the  number  of  the  shares  of
Registrable  Securities  to be  disposed of by Unocal.  If TBI elects,  prior to
effectiveness,  not to proceed with a primary  registration of TBI Common Stock,
it shall not be obligated to register any  Registrable  Securities,  unless such
primary  registration  was  initiated  as provided in Section  6.1(a)  after TBI
received a request for a Demand Registration.

         (b) Priority on Primary  Registrations.  If a Piggyback Registration is
an  underwritten  primary  registration  on  behalf  of  TBI  and  the  managing
underwriter(s)  of such offering advise TBI in writing that in their opinion the
number of securities  requested to be included in such registration  exceeds the
number which can  reasonably be sold in such offering  without having a material
adverse impact on the offering,  then TBI shall include in such registration (i)
first,  subject to Section  6.2(c) below,  the  securities  that TBI proposes to
sell, (ii) second,  Registrable  Securities  requested to be included therein by
Unocal and parties  which as of the Closing  Date had  registration  rights on a
pari passu basis with Unocal and (iii) third,  other securities  requested to be
included in such registration.

         (c) Mandatory  Inclusion of Registrable  Securities.  In the event that
the number of Registrable  Securities  requested to be included by Unocal in any
registration  pursuant to the piggyback  registration  rights afforded herein is
reduced,  then TBI will, to the extent requested by Unocal, reduce the number of
shares  which TBI desires to offer so that  Unocal can include in such  offering
shares representing up to 20% of the entire offering.

         (d) Priority on Secondary Registrations. If a Piggyback Registration is
an underwritten  secondary registration on behalf of holders of TBI's securities
other than Unocal and the managing underwriter(s) of such offering advise TBI in
writing that in their opinion the number of securities  requested to be included
in such  registration  exceeds the number which can  reasonably  be sold in such
offering,  then TBI  shall  include  in such  registration  (i)  first,  if such
registration  is being made on behalf of other  stockholders  of TBI  exercising
demand registration rights, then the securities so


                                      -10-

<PAGE>



requested to be included  therein in  accordance  with such demand  registration
rights,  (ii) second,  Registrable  Securities  requested to be included in such
registration by Unocal and parties which as of the Closing Date had registration
rights on a pari passu  basis  with  Unocal and (iii)  third,  other  securities
requested to be included in such  registration.  If the managing  underwriter of
such offering  subsequently advises TBI in writing that the number of securities
which can be sold exceeds the number of securities included in the offering, TBI
shall include in the  registration  such  additional  securities that (i) first,
Unocal had originally requested be included in the registration and (ii) second,
others had originally proposed to include in the registration.

         (e) Other Registrations. If (i) TBI has previously filed a registration
statement  with  respect to any of  Registrable  Securities  pursuant to Section
6.1(a) or 6.2(b) and (ii) such previous  registration  has not been withdrawn or
abandoned, TBI shall not file or cause to be effective any other registration of
any of its equity  securities or securities  convertible or exchangeable into or
exercisable for its equity  securities  under the Securities Act (except on Form
S-8 or S-4 or any successor  form),  whether on its own behalf or at the request
of any holder or holders of such  securities,  until a period of at least ninety
(90) days has elapsed from the effective date of such previous registration.

         (f) Piggyback Not A Demand Registration.  Should Unocal's participation
in a registration be pursuant to a Piggyback Registration in connection with (i)
an  underwritten  primary  registration on behalf of TBI as described in Section
6.2(a), or (ii) an underwritten  secondary  registration on behalf of holders of
TBI's  securities  other than Unocal as described in Section  6.2(d),  then such
participation by Unocal shall not constitute a Demand  Registration for purposes
of determining the number of Demand Registrations Unocal is entitled to pursuant
to Section 6.1(a).

         (g)  Universal  Shelf.  TBI  reserves  the right to file and secure the
effectiveness  under the Securities Act of a registration  statement on Form S-3
covering  undifferentiated  debt and equity securities (the "Shelf  Registration
Statement").  The  undifferentiated  securities  may be converted  into specific
types of debt or equity securities by describing the security in a supplement to
the  prospectus  set forth in the Shelf  Registration  Statement (a  "Prospectus
Supplement").  In the event that TBI specifically  considers  proposing to offer
and sell TBI Common Stock pursuant to a Prospectus Supplement  ("Offering"),  it
shall give Unocal  notice of such  consideration.  Such notice shall not, in any
circumstance, be delivered less than five (5) business days prior to delivery of
the Acceleration Notice (as defined below). TBI shall notify Unocal, in writing,
of its intention to file the Prospectus  Supplement and shall specify the number
of shares of TBI Common  Stock that it  proposes  to sell in the  Offering  (the
"Accelerated Notice"). Unocal may elect to include Registrable Securities in the
Offering by providing  written  notice to TBI within twenty four hours after its
receipt  of the  Accelerated  Notice  that it  desires  to  include  Registrable
Securities in the Offering,  with such notice to specify the number of shares of
Registrable  Securities  to  be  included  on  behalf  of  Unocal.   Registrable
Securities  shall  not be  deemed  to be  registered  under  Securities  Act for
purposes of this Agreement until a Prospectus  Supplement expressly referring to
the  offering  and sale of TBI Common  Stock for the  account of Unocal is filed
with the  Commission.  In order to assure that  sufficient  securities have been
registered under the Shelf Registration Statement to


                                      -11-

<PAGE>



accommodate  the sale by  Unocal  of  Registrable  Securities  from time to time
pursuant to one or more Prospectus  Supplements,  TBI shall reflect in the Shelf
Registration  Statement that 20% of the securities  registered  thereunder  have
been  reserved  for sale by  Unocal  if and only if (i) TBI  elects  to sell TBI
Common Stock  pursuant to a Prospectus  Supplement and (ii) Unocal timely elects
to include  Registrable  Securities for sale therein as required by this Section
6.2(g).  To the  extent  that the  express  terms  of this  Section  6.2(g)  are
inconsistent with the other provisions of Section 6.2, the terms of this Section
6.2(g) shall prevail.

                  Section 6.3 Holdback  Agreements.  (a) General.  Unocal agrees
not to effect any public sale or  distribution  of equity  securities of TBI, or
any  securities  convertible  into  or  exchangeable  or  exercisable  for  such
securities,  including,  without limitation,  sales pursuant to Rule 144 (or any
similar  rule  then in  effect),  during  the 10 days  prior  to and the 90 days
beginning on the effective date of any underwritten  Demand  Registration or any
underwritten  Piggyback  Registration in which shares of Registrable  Securities
are  included  (except  as part of such  underwritten  registration)  unless the
underwriters managing the registered public offering otherwise agree.

         (b)  Agreement  by TBI.  TBI agrees  not to effect  any public  sale or
distribution of its equity  securities,  or any securities  convertible  into or
exchangeable or exercisable for such securities, during the 10 days prior to and
during the 90 days  beginning on the effective date of any  underwritten  Demand
Registration  or any  underwritten  Piggyback  Registration  in which  shares of
Registrable  Securities  are  included  unless  the  underwriters  managing  the
registered public offering and Unocal otherwise agree.

         (c)  Registration  Procedures.  Whenever Unocal  requests  registration
pursuant to this Agreement,  TBI shall use  commercially  reasonable  efforts to
effect the  registration  and the sale of such shares of Registrable  Securities
for which  registration  is requested in accordance  with the intended method of
disposition  thereof,  and  pursuant  thereto  TBI  shall  as  expeditiously  as
possible:

                  (i)  prepare  and file  with  the  Commission  a  registration
statement  with  respect  to such  securities  and use  commercially  reasonable
efforts to cause such registration  statement to become effective (provided that
before  filing a  registration  statement or  prospectus  or any  amendments  or
supplements  thereto,  TBI will  furnish to Unocal and the  counsel  selected by
Unocal copies of all documents  proposed to be filed,  which  documents  will be
subject to the review of such counsel);

                  (ii) prepare and file with the Commission  such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration  statement effective for
a period of not less than 180 days after such registration statement is declared
effective, provided that TBI shall have no obligation pursuant to this Agreement
to maintain the effectiveness of such  registration  statement after the sale of
the securities  registered  thereunder,  and shall comply with the provisions of
the  Securities Act with respect to the  disposition of all securities  owned by
Unocal that are  covered by such  registration  statement  during such period in
accordance with the intended methods of disposition by Unocal;


                                      -12-

<PAGE>



                  (iii)  furnish  to  Unocal  such  number  of  copies  of  such
registration  statement,  each amendment and supplement thereto,  the prospectus
included in such registration statement (including each preliminary  prospectus)
and such other  documents  as Unocal  may  request  in order to  facilitate  the
disposition of the shares owned by Unocal;

                  (iv)  use  commercially  reasonable  efforts  to  register  or
qualify such shares of  Registrable  Securities  under such other  securities or
Blue Sky Laws of such  jurisdictions as Unocal requests and do any and all other
commercially  reasonable  acts and things which may be necessary or advisable to
enable Unocal to consummate the disposition in such jurisdictions of Registrable
Securities  (provided that TBI will not be required to (A) qualify  generally to
do  business in any  jurisdiction  where it would not  otherwise  be required to
qualify but for this subclause  (iv), (B) subject itself to taxation in any such
jurisdiction or (C) consent to general service of process in such jurisdiction);

                  (v) cause all such Registrable Securities to be listed on each
securities exchange on which securities issued by TBI that are of the same class
as Registrable Securities are then listed;

                  (vi)     provide a transfer agent and registrar for all such
Registrable Securities no later than the effective date of such registration
statement;

                  (vii) obtain a "cold  comfort"  letter from TBI's  independent
public accountants in customary form,  covering such matters of the type usually
and customarily covered by "cold comfort" letters delivered to underwriters, and
covering  such other  matters as Unocal may  reasonably  request;  and obtain an
opinion of counsel for TBI in customary form,  covering such matters of the type
usually  and  customarily  covered in  opinions of legal  counsel  delivered  to
underwriters, and covering such other matters as Unocal may reasonably request;

                  (viii) if  underwriters  are  engaged in  connection  with any
registration  referred  to in  this  Agreement,  TBI  shall  provide  usual  and
customary  indemnification,  representations,  covenants,  opinions,  and  other
assurances to the underwriters in form and substance reasonably  satisfactory to
such underwriter as consistent with current practice in the marketplace;

                  (ix)  notify  Unocal and the  managing  underwriters,  if any,
promptly,  and (if requested by any such person) confirm such advice in writing,
(A) when a prospectus or any prospectus  supplement or post-effective  amendment
has  been  filed,  and,  with  respect  to  a  registration   statement  or  any
post-effective amendment, when the same has become effective, (B) of any request
by the Commission  for amendments or supplements to a registration  statement or
related  prospectus or for  additional  information,  (C) of the issuance by the
Commission of any stop order  suspending  the  effectiveness  of a  registration
statement or the  initiation of any  proceedings  for that  purpose,  (D) of the
receipt  by  TBI of any  notification  with  respect  to the  suspension  of the
qualification of any of the Registrable  Securities for sale in any jurisdiction
or the initiation or threatening of any proceeding for such purpose,  (E) of the
happening  of  any  event  which  requires  the  making  of  any  changes  in  a
registration  statement or related  prospectus so that such  documents  will not
contain any


                                      -13-

<PAGE>



untrue  statement of a material fact or omit to state any material fact required
to be stated therein or necessary to make the statements therein not misleading,
in light of the  circumstances  under which such statements are made, and (F) of
TBI's reasonable determination that a post-effective amendment to a registration
statement would be required;

                  (x)  notify  Unocal  at any time  when a  prospectus  relating
thereto is required to be delivered  under the Securities Act, of the occurrence
of any event as a result of which the prospectus  included in such  registration
statement  contains  an untrue  statement  of a material  fact or omits any fact
necessary to make the statements therein not misleading,  and, at the request of
Unocal,  TBI shall prepare a supplement or amendment to such prospectus so that,
as  thereafter  delivered  to the  purchasers  of such  shares  such  amended or
supplemented prospectus shall not contain an untrue statement of a material fact
or omit to state any fact necessary to make the statements  therein, in light of
the circumstances under which they were made, not misleading;

                  (xi) use commercially  reasonable efforts to obtain as soon as
reasonably  practicable the withdrawal of any order suspending the effectiveness
of  a  registration   statement,  or  the  lifting  of  any  suspension  of  the
qualification of any of Registrable Securities for sale in any jurisdiction;

                  (xii) if  requested by the  managing  underwriters  or Unocal,
incorporate  in  a  prospectus  supplement  or  post-effective   amendment  such
information as the managing  underwriter(s)  and Unocal agree should be included
therein  relating  to the  sale  and  distribution  of  Registrable  Securities,
including,  without  limitation,  information  with  respect  to the  number  of
Registrable Securities being sold to such underwriters, the purchase price being
paid  therefor by such  underwriters  and with respect to any other terms of the
underwritten (or best efforts underwritten)  offering of Registrable  Securities
to be sold in such  offering;  make  all  required  filings  of such  prospectus
supplement or post-effective  amendment as soon as notified of the matters to be
incorporated  in such prospectus  supplement or  post-effective  amendment;  and
supplement  or make  amendments  to any  registration  statement if requested by
Unocal or any underwriter of such shares;

                  (xiii)  furnish  to  Unocal  and  each  managing  underwriter,
without charge,  such signed copies of the registration  statement or statements
and any post-effective  amendment thereto,  including  financial  statements and
schedules,  all  documents  incorporated  therein by reference  and all exhibits
(including  those  incorporated by reference) as Unocal or managing  underwriter
may reasonably request;

                  (xiv)  cooperate with Unocal and the managing  underwriter(s),
if any, to  facilitate  the timely  preparation  and  delivery  of  certificates
representing  shares to be sold and not bearing any  restrictive  legends unless
required by applicable  law; and enable such shares to be in such  denominations
and registered in such names as the managing underwriter(s) may request at least
two business days prior to any sale of shares to the underwriters;



                                      -14-

<PAGE>



                  (xv) in the case of an underwritten offering,  enter into such
usual and customary agreements (including  underwriting  agreements in usual and
customary form) and take all such other actions as Unocal or the underwriter(s),
if any,  request  and which TBI can  reasonably  perform in order to expedite or
facilitate the disposition of such Registrable Securities; and

                  (xvi) make available for inspection by Unocal, any underwriter
participating in any disposition  pursuant to such registration  statement,  and
any  attorney,  accountant  or  other  agent  retained  by any  such  seller  or
underwriter,  all financial and other records, pertinent corporate documents and
properties  of  TBI,  and  cause  TBI's  officers,   directors,   employees  and
independent  accountants to supply all information  reasonably  requested by any
such seller, underwriter,  attorney, accountant or agent in connection with such
registration statement.

                  Section  6.4  Information  to  be  Furnished  by  Unocal.   In
connection with any registration of Registrable  Securities  hereunder,  TBI may
require  Unocal to furnish TBI with such  information  regarding  Unocal and the
distribution of such shares as TBI may from time to time  reasonably  request in
writing in order to comply with the Securities  Act. Unocal agrees to notify TBI
as promptly as practicable of any inaccuracy or change in information previously
furnished to TBI or of the occurrence of any event in either case as a result of
which any prospectus relating to such registration contains untrue statements of
a material fact regarding  Unocal or the distribution of such shares required to
be stated  therein or necessary to make the statement  therein not misleading in
light of the  circumstances  under  which  such  statements  were  made,  and to
promptly  furnish to TBI any  additional  information  required  to correct  and
update  any  previously  furnished   information  or  required  such  that  such
prospectus shall not contain, with respect to Unocal or the distribution of such
shares,  an untrue statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading in light of the circumstances under which such statements are made.

                  Section  6.5   Suspension  of  Offering   Pending   Prospectus
Supplement or Amendment. Unocal agrees that, upon receipt of any notice from TBI
of the occurrence of any event of the kind  described in Section  6.3(c)(ix)(B),
(C), (D), (E) or (F) hereof,  Unocal will forthwith  discontinue  disposition of
Registrable  Securities  covered by such  registration  statement or  prospectus
until  such  holder's  receipt  of the  copies of the  supplemented  or  amended
prospectus relating to such registration statement or prospectus, or until it is
advised  in  writing  by TBI that the use of the  applicable  prospectus  may be
resumed, and has received copies of any additional or supplemental filings which
are  incorporated by reference in such  prospectus,  and, if so directed by TBI,
Unocal will deliver to TBI (at TBI's  expense) all copies,  other than permanent
file copies then in Unocal's possession,  of the prospectus covering Registrable
Securities current at the time of receipt of such notice.

                  Section 6.6 Registration  Expenses.  (a) General. All expenses
incident to TBI's performance and execution of Demand Registrations or Piggyback
Registrations,  and TBI's  performance  of, or compliance  with, this Agreement,
including  without  limitation,  all  registration  and  filing  fees,  fees and
expenses of compliance with securities or Blue Sky Laws, expenses and fees


                                      -15-

<PAGE>



for listing the  securities on the  appropriate  securities  exchanges,  cost of
liability insurance,  all internal expenses,  the expense of any annual audit or
quarterly review,  printing expenses,  messenger and delivery expenses, fees and
disbursements   of  counsel  for  TBI  and  all  independent   certified  public
accountants  (including  the  expenses of any special  audit and "cold  comfort"
letters  required by or incident to such  performance),  and usual and customary
fees  and  costs  of  underwriters  (excluding  gross  spreads,   discounts  and
commissions  and fees of  underwriters,  selling  brokers,  dealer  managers  or
similar  securities  industry  professionals  relating  to the  distribution  of
Registrable  Securities)  and other  persons  retained by TBI (all such expenses
being herein called "Registration Expenses"), shall be borne by TBI.

         (b)  Reimbursement  for Counsel Fees.  In  connection  with each Demand
Registration,  TBI shall also reimburse  Unocal for its reasonable legal fees of
outside counsel up to $20,000.

         (c) Payment of Expenses by Unocal.  Unocal shall pay the  underwriters'
fees and expenses, the underwriters' gross spreads, discount and commissions and
the commissions and fees, if any, payable in respect of selling brokers,  dealer
managers  or similar  securities  industry  professionals,  and  transfer  taxes
allocable to the  registration of Unocal's  securities so included in any Demand
or Piggyback Registration pursuant to this Agreement.

                  Section   6.7   Underwritten   Offerings.   (a)   Underwriting
Agreement.  In any offering by Unocal pursuant to a registration requested under
Sections 6.1(a) or 6.2(a),  TBI shall enter into a standard form of underwriting
agreement  which shall be reasonably  satisfactory  in form and substance to TBI
and  Unocal  and the  underwriters  and  which  shall  contain  representations,
warranties and agreements  (including  indemnification  agreements to the effect
and  consistent  with that  provided  in Section  6.8 hereof) as are usually and
customarily  included by an issuer in  underwriting  agreements  with respect to
primary  distributions.  Unocal shall be a party to such underwriting  agreement
and may,  at its  option,  require  that any or all of the  representations  and
warranties  by,  and the  other  agreements  on the part of,  TBI to and for the
benefit of such underwriters shall also be made to and for the benefit of Unocal
and that  any or all of the  conditions  precedent  to the  obligations  of such
underwriters  under such underwriting  agreement be conditions  precedent to the
obligations of Unocal.

         (b) Condition to Participation and  Qualifications to Obligations Under
Registration  Covenants.  The obligations of TBI to use commercially  reasonable
efforts to cause  Registrable  Securities to be registered  under the Securities
Act are subject to each of the conditions that Unocal may not participate in any
underwritten  offering  hereunder  unless Unocal (a) agrees to sell  Registrable
Securities on the basis provided in any  underwriting  arrangements  approved by
the persons  entitled  hereunder to approve such  arrangements and (b) completes
and executes all questionnaires, powers of attorney, underwriting agreements and
other  documents  reasonably  required  under  the  terms  of such  underwriting
arrangements.

                  Section 6.8   Indemnification.  (a) By TBI.  In the event of
any registration of any shares of Registrable Securities under the Securities
Act, TBI will, and hereby does, indemnify and


                                      -16-

<PAGE>



hold harmless, to the fullest extent permitted by law, Unocal, its directors and
officers,  each other person who  participates as an underwriter in the offering
or sale of such securities and each other person,  if any, who controls any such
underwriter  within  the  meaning of the  Securities  Act,  against  any and all
losses, claims, damages, liabilities and expenses, joint or several, (or actions
or proceedings,  whether  commenced or threatened,  in respect thereof) to which
they or any of them may become  subject  under the  Securities  Act or any other
statute  or  common  law,  including  any  amount  paid  in  settlement  of  any
litigation,  commenced or  threatened,  and to  reimburse  them for any legal or
other expenses incurred by them in connection with  investigating any claims and
defending any actions, insofar as any such losses, claims, damages, liabilities,
expenses or actions  arise out of or are based upon (i) any untrue  statement or
alleged  untrue  statement  of a material  fact  contained  in the  registration
statement  relating  to the  sale  of  such  securities  or  any  post-effective
amendment  thereto or in any filing made in connection with the qualification of
the offering under Blue Sky or other  securities laws or  jurisdictions in which
Registrable  Securities  are offered  ("Blue Sky  Filing"),  or the  omission or
alleged  omission to state therein or necessary in order to make the  statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading  or (ii) any  untrue  statement  or  alleged  untrue  statement  of a
material  fact  contained in any  preliminary  prospectus,  if used prior to the
effective  date  of  such  registration  statement  (unless  such  statement  is
corrected  in the  final  prospectus  and TBI has  previously  furnished  copies
thereof to Unocal and the  underwriters),  or contained in the final  prospectus
(as amended or  supplemented  if TBI shall have filed with the  Commission,  and
furnished to Unocal and the underwriters of such offering copies thereof,  prior
to the written confirmation of any sale to the person asserting  liability,  any
amendment thereof or supplement  thereto) if used within the period during which
TBI is  required to keep the  registration  statement  to which such  prospectus
relates  current,  or the omission or alleged  omission to state  therein (if so
used) a material  fact  necessary in order to make the  statements  therein,  in
light of the circumstances under which they were made, not misleading; provided,
however, that the indemnification agreement contained herein shall not (i) apply
to such losses, claims,  damages,  liabilities,  expenses or actions arising out
of, or based upon, any such untrue statement or alleged untrue statement, or any
such  omission or alleged  omission,  if such  statement or omission was made in
reliance upon and in  conformity  with written  information  furnished to TBI by
Unocal or such  underwriter  specifically for use in connection with preparation
of the registration  statement,  any preliminary  prospectus or final prospectus
contained  in the  registration  statement,  any such  amendment  or  supplement
thereto or any Blue Sky Filing or (ii) inure to the  benefit of any  underwriter
or any person  controlling such  underwriter,  to the extent that any such loss,
claim, damage, liability (or action or proceeding in respect thereof) or expense
arises  out of such  person's  failure  to  send  or  give a copy  of the  final
prospectus,  as the same may be then  supplemented  or  amended,  to the  person
asserting an untrue statement or alleged untrue statement or omission or alleged
omission  at or prior to the  written  confirmation  of the sale of  Registrable
Securities  to such person if such  statement or omission was  corrected in such
final  prospectus.  Such  indemnity  shall  remain  in  full  force  and  effect
regardless of any investigation  made by or on behalf of such seller or any such
director,  officer or controlling  person and shall survive the transfer of such
securities by such seller.



                                      -17-

<PAGE>



         (b) By Unocal.  TBI may require,  as a condition  to including  any TBI
Common Stock in any registration statement filed pursuant to Section 6.1 or 6.2,
that TBI shall have received an undertaking  satisfactory to it from Unocal,  to
indemnify  and hold  harmless  (in the same manner and to the same extent as set
forth in Section 6.8(a)) TBI, each director of TBI, each officer of TBI and each
other person, if any, who controls TBI within the meaning of the Securities Act,
each other person who  participates as an underwriter in the offering or sale of
such securities and each other person, if any, who controls any such underwriter
within the meaning of the Securities Act with respect to any untrue statement or
alleged  untrue  statement  in, or  omission  or  alleged  omission  from,  such
registration statement, any preliminary prospectus or final prospectus contained
therein,  or any amendment or supplement  thereto, if such statement or omission
was made in reliance upon and in conformity with written  information  furnished
to TBI by Unocal relating to Unocal  specifically  for use in the preparation of
such registration statement, preliminary prospectus, final prospectus, amendment
or supplement.  Such indemnity shall remain in full force and effect, regardless
of any investigation  made by or on behalf of TBI or any such director,  officer
or controlling  person and shall survive the transfer of such securities by such
seller.  In no event shall any indemnity  paid by Unocal to TBI pursuant to this
Section  6.8(b),  or otherwise,  exceed the proceeds  received by Unocal in such
offering.

         (c) Notices of Claims,  etc.  Promptly  after receipt by an indemnified
party of notice of the  commencement  of any action or  proceeding  involving  a
claim referred to in Sections 6.8(a) or 6.8(b),  such indemnified party will, if
a claim in respect  thereof is to be made against an  indemnifying  party,  give
written notice to the latter of the  commencement of such action,  provided that
the failure of any indemnified party to give notice as provided herein shall not
relieve  the  indemnifying  party of its  obligations  under  Section  6.8(a) or
6.8(b), as the case may be, except to the extent that the indemnifying  party is
actually  prejudiced by such failure to give notice.  In case any such action is
brought against an indemnified  party, the indemnifying  party shall be entitled
to participate in and, unless in such indemnified  party's reasonable judgment a
conflict of interest between such indemnified and indemnifying parties may exist
in respect of such claim, to assume the defense thereof,  jointly with any other
indemnifying  party  similarly  notified  to the extent  that it may wish,  with
counsel reasonably satisfactory to such indemnified party, and after notice from
the indemnifying  party to such  indemnified  party of its election so to assume
the  defense  thereof,  the  indemnifying  party  shall  not be  liable  to such
indemnified party for any legal or other expenses  subsequently  incurred by the
latter in connection  with the defense  thereof other than  reasonable  costs of
investigation.  In the event that the indemnifying  party advises an indemnified
party  that it will  contest a claim for  indemnification  hereunder,  or fails,
within 30 days of receipt of any  indemnification  notice to notify, in writing,
such person of its election to defend,  settle or  compromise,  at its sole cost
and expense, any action, proceeding or claim (or discontinues its defense at any
time after it commences such defense),  then the  indemnified  party may, at its
option,  defend,  settle or otherwise compromise or pay such action or claim. In
any event,  unless and until the indemnifying  party elects in writing to assume
and does so assume the  defense of any such  claim,  proceeding  or action,  the
indemnified party's costs and expenses arising out of the defense, settlement or
compromise of any such action,  claim or proceeding  shall be losses  subject to
indemnification  hereunder. The indemnified party shall cooperate fully with the
indemnifying party


                                      -18-

<PAGE>



in connection with any negotiation or defense of any such action or claim by the
indemnifying  party and shall furnish to the indemnifying  party all information
reasonably  available to the  indemnified  party which relates to such action or
claim. The indemnifying party shall keep the indemnified party fully apprised at
all times as to the status of the defense or any  settlement  negotiations  with
respect thereto.  If the indemnifying  party elects to defend any such action or
claim,  then the  indemnified  party shall be entitled  to  participate  in such
defense  with  counsel  of its  choice  at its  sole  cost and  expense.  If the
indemnifying  party does not assume such defense,  the  indemnified  party shall
keep the  indemnifying  party  apprised  at all  times as to the  status  of the
defense;  provided,  however, that the failure to keep the indemnifying party so
informed shall not affect the obligations of the  indemnifying  party hereunder.
No indemnifying party shall be liable for any settlement of any action, claim or
proceeding  effected without its written consent;  provided,  however,  that the
indemnifying  party shall not  unreasonably  withhold,  delay or  condition  its
consent.  No  indemnifying  party shall,  without the consent of the indemnified
party,  consent to entry of any judgment or enter into any settlement which does
not  include as an  unconditional  term  thereof  the giving by the  claimant or
plaintiff to such  indemnified  party of a release from all liability in respect
to such claim or litigation.

         (d) Contribution. If the indemnification provided for in or pursuant to
Section  6.8(a) or 6.8(b) is due in accordance  with the terms  thereof,  but is
held by a court to be  unavailable  or  unenforceable  in respect of any losses,
claims,  damages,  liabilities  or  expenses  referred  to  therein,  then  each
applicable  indemnifying  party, in lieu of indemnifying such indemnified party,
shall contribute to the amount paid or payable by such  indemnified  person as a
result  of  such  losses,  claims,  damages,  liabilities  or  expenses  in such
proportion as is appropriate  to reflect the relative fault of the  indemnifying
party on the one hand and of the  indemnified  party on the other in  connection
with the statements or omissions which resulted in such losses, claims, damages,
liabilities or expenses as well as any other relevant equitable  considerations.
The  relative  fault  of the  indemnifying  party  on the  one  hand  and of the
indemnified person on the other shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged  omission to state a material  fact  relates to  information
supplied by the indemnifying  party or by the indemnified party, by such party's
relative intent, knowledge,  access to information and opportunity to correct or
prevent such statement,  or omission.  In no event shall the liability of Unocal
be greater in amount  than the amount of  proceeds  received by Unocal upon such
sale.

                  Section  6.9 Third  Party  Registration  Rights.  TBI will not
hereafter grant any  registration  rights to third parties which are prior to or
pari passu with the  registration  rights  afforded  Unocal  hereunder,  without
Unocal's prior written consent.



                                      -19-

<PAGE>



                                   ARTICLE VII

                                  MISCELLANEOUS

                  Section 7.1 Injunctive  Relief.  Each party  acknowledges  and
agrees that the other party could be irreparably damaged in the event any of the
provisions of this Agreement were not performed by the party required to perform
the same in accordance  with their specific  terms or were  otherwise  breached.
Each party  accordingly  agrees  that the other  party  shall be  entitled to an
injunction  or  injunctions  to  prevent  breaches  of the  provisions  of  this
Agreement  in any  court  of the  United  States  or any  state  thereof  having
jurisdiction,  in addition to any remedy to which a party may be entitled at law
or equity.

                  Section 7.2 Severability.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid,  void,  or  unenforceable,  the  remainder  of the  terms,  provisions,
covenants and restrictions shall remain in full force and effect and shall in no
way be affected,  impaired or invalidated.  It is hereby stipulated and declared
to be the  intention of the parties that they would have  executed the remaining
terms,  provisions,  covenants and  restrictions  without  including any of such
which may be hereafter declared invalid, void or enforceable.

                  Section 7.3  Amendments.  This  Agreement  contains the entire
understanding  of the  parties  with  respect  to TBI Common  Stock,  and may be
amended only by an agreement in writing signed by the parties hereto.

                  Section 7.4  Descriptive Headings.  Descriptive headings are
for convenience only and shall not control or affect the meaning or construction
of any provision of this Agreement.

                  Section 7.5 Counterparts.  For the convenience of the parties,
any number of  counterparts  of this  Agreement  may be  executed by one or more
parties hereto and each such executed  counterpart shall be, and shall be deemed
to be, an original instrument.

                  Section  7.6  Notices.   All  notices,   consents,   requests,
instructions,  approvals  and other  communications  provided for herein and all
legal process in regard  hereto shall be validly  given,  made or served,  if in
writing and delivered  personally,  by facsimile  transmission (except for legal
process) or sent by registered mail, postage prepaid, if to:

                  To Unocal:

                  Union Oil Company of California
                  14141 Southwest Freeway
                  Sugar Land, Texas 77478
                  Fax No. (281) 287-5170
                  Attention: Director, Business Development

                                      -20-

<PAGE>



                  with a copy to:

                  Union Oil Company of California
                  d.b.a. Spirit Energy 76
                  14141 Southwest Freeway
                  Sugar Land, Texas 77478
                  Fax No. (281) 287-7376
                  Attention: Vice President and General Counsel

                  To TBI:

                  Tom Brown, Inc.
                  555 17th St., Suite 1850
                  Denver, Colorado 80202
                  Fax No.: 303-260-5001
                  Attention: General Counsel

or to such other address and facsimile numbers as any part hereto may, from time
to time,  designate in a written notice given in a like manner.  Notice given by
facsimile  transmission shall be deemed delivered on the day the sender receives
facsimile  transmission  confirmation  that  such  notice  was  received  at the
facsimile  number of the addressee.  Notice given by mail as set out above shall
be deemed delivered three days after the date the same is postmarked.

                  Section 7.7 Law  Applicable.  This Agreement shall be governed
by and construed and enforced in accordance  with the laws of the State of Texas
(without regard to the principles of conflicts of law thereof).

                  Section 7.8  Successors and Assigns.  This Agreement  shall be
binding  upon and inure to the benefit of and be  enforceable  by Unocal and TBI
and their respective successors and assigns.

                  IN WITNESS WHEREOF,  the parties have caused this Agreement to
be duly executed by their respective officers,  each of whom is duly and validly
authorized and empowered, all as of the day and year first above written.

                                             TOM BROWN, INC.



                                             By:     /s/ Peter R. Scherer
                                                   ___________________________
                                             Name:    Peter R. Scherer
                                             Title:   Executive Vice President




                                      -21-

<PAGE>


                                             UNION OIL COMPANY OF CALIFORNIA



                                             By:      /s/ Robert C. Gnagy
                                                   ___________________________
                                             Name:    Robert C. Gnagy
                                             Title:   Attorney-In-Fact




                                      -22-



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