UNOCAL CORP
SC 13D, 2000-06-05
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

                      PURE RESOURCES, INC.
  ------------------------------------------------------------
                        (Name of Issuer)

                          Common Stock
  ------------------------------------------------------------
                 (Title of Class of Securities)

                           74622E 10 2
                 ------------------------------
                         (CUSIP Number)

                     Dennis P.R. Codon, Esq.
     Vice President, Chief Legal Officer and General Counsel
                       UNOCAL CORPORATION
                2141 Rosecrans Avenue, Suite 4000
                  El Segundo, California 90245
                          (310)726-7600
  ------------------------------------------------------------
   (Name, Address and Telephone Number of Person Authorized to
               Receive Notices and Communications)

                          May 25, 2000
                   --------------------------
          (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 / /.

                 (Continued on following pages)


<PAGE>
------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

   Unocal Corporation., I.R.S.No.: 95-3825062
------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
      (a) / /
      (b) /X/
     N/A
------------------------------------------------------------
3   SEC USE ONLY
------------------------------------------------------------
4   SOURCE OF FUNDS

    AF
------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEMS 2(D) OR 2(E)              / /
------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware
------------------------------------------------------------

 NUMBER OF          7   SOLE VOTING POWER           -0-
  SHARES             ------------------------------------------
BENEFICIALLY        8   SHARED VOTING POWER       34,659,402*
 OWNED BY           ------------------------------------------
   EACH             9   SOLE DISPOSITIVE POWER    32,709,067
REPORTING           ------------------------------------------
  PERS0N            10  SHARED DISPOSITIVE POWER    -0-
   WITH
------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
    PERSON
    34,659,402*
------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES  / /
     N/A
------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    69.3%
------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    CO
------------------------------------------------------------
 *   Includes 32,709,067 shares directly owned by Union Oil
Company of California, and 1,950,335 shares owned or subject to
vested options held by Jack D. Hightower, with respect to which
the reporting persons may be deemed to share voting control by
virtue of the Voting Agreement described herein.  Does not
include 1,800,000 shares subject to employee stock options owned
by Mr. Hightower that are not exercisable within 60 days.
                             i

<PAGE>
------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

   Union Oil Company of California, I.R.S. No.: 95-1315450
------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
      (a) / /
      (b) /X/
     N/A
------------------------------------------------------------
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

    California
------------------------------------------------------------

 NUMBER OF          7   SOLE VOTING POWER           -0-
  SHARES             ------------------------------------------
BENEFICIALLY        8   SHARED VOTING POWER       34,659,402*
 OWNED BY           ------------------------------------------
   EACH             9   SOLE DISPOSITIVE POWER    32,709,067
REPORTING           ------------------------------------------
  PERS0N            10  SHARED DISPOSITIVE POWER    -0-
   WITH
------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
    PERSON
    34,659,402*
------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES  / /
     N/A
------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    69.3%
------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    CO
------------------------------------------------------------
 *   Includes 32,709,067 shares directly owned by Union Oil
Company of California, and 1,950,335 shares owned or subject to
vested options held by Jack D. Hightower, with respect to which
the reporting persons may be deemed to share voting control by
virtue of the Voting Agreement described herein.  Does not
include 1,800,000 shares subject to employee stock options owned
by Mr. Hightower that are not exercisable within 60 days.
                             ii

<PAGE>

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

     The  class  of equity securities to which this statement  on
Schedule 13D (this "Statement") relates is the common stock,  par
value  $0.01 per share ("Pure Common Stock"), of Pure  Resources,
Inc., a Delaware corporation ("Pure Resources").  Pure Resources'
principal executive offices are located at 500 West Texas,  Suite
200, Midland, Texas 79701.

Item 2.   Identity and Background:
------    -----------------------

     This statement is being filed jointly by Unocal Corporation,
a  Delaware  corporation ("Unocal"), and  Union  Oil  Company  of
California  ("Union Oil"), a California corporation  and  wholly-
owned subsidiary of Unocal.  Unocal conducts substantially all of
its  operations through Union Oil and subsidiaries of Union  Oil.
Unocal  is  one of the world's largest independent  oil  and  gas
exploration  and  production companies, with major  oil  and  gas
exploration  and  production activities in Asia  and  the  United
States  Gulf  of  Mexico.  Unocal is also a leading  producer  of
geothermal  energy;  a  provider  of  electrical  power;  and   a
manufacturer   and   marketer   of  nitrogen-based   fertilizers,
petroleum   coke,   graphites  and  specialty   minerals.   Other
activities  include project development, ownership in proprietary
and  common  carrier pipelines and the marketing and  trading  of
hydrocarbon commodities.

      Unocal's  and Union Oil's principal executive  offices  are
located  at  2141  Rosecrans  Avenue,  Suite  4000,  El  Segundo,
California  90245 and their telephone number at that  address  is
(310)  726-7600.  Schedule I attached hereto sets  forth  certain
additional  information with respect to each  director  and  each
executive  officer of Unocal and Union Oil.  The filing  of  this
statement  on Schedule 13D shall not be construed as an admission
that  Unocal, Union Oil or any person listed on Schedule I hereto
is,  for the purposes of Section 13(d) or 13(g) of the Securities
Exchange  Act  of  1934, the beneficial owner of  any  securities
covered by this statement.

     During the past five years, Union Oil has been convicted  of
a number of misdemeanor criminal violations.  These cases usually
involved  minor violations of state or local environmental  laws.
However,  one  of these misdemeanor convictions was  significant.
On  July  19,  1995, Union Oil 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.

     Except  as  provided  above, during  the  past  five  years,
neither Unocal nor Union Oil nor, to the best of the knowledge of
each  of Unocal and Union Oil, any of the persons referred to  in
Schedule I has been convicted in a criminal proceeding (excluding
traffic violations and similar misdemeanors).

      Neither Unocal nor Union Oil nor, to the best knowledge  of
each  of Unocal and Union Oil, any of the persons referred to  in
Schedule  I 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.

     All persons named in Schedule I are citizens of the United
States.

Item 3.      Source and Amount of Funds or Other Consideration:
------       -------------------------------------------------
                              1
<PAGE>

     This   Statement   is   being  filed  in   connection   with
transactions  contemplated by the Agreement and  Plan  of  Merger
dated  December 13, 1999, as amended ("Merger Agreement"),  among
Union   Oil,  Pure  Resources  (formerly  named  Titan  Resources
Holdings,  Inc.), TRH, Inc., a Delaware corporation  and  wholly-
owned  subsidiary  of Pure Resources ("Merger  Sub"),  and  Titan
Exploration, Inc., a Delaware corporation ("Titan").

     The  closing of the transactions contemplated by the  Merger
Agreement  occurred on May 25, 2000, at which time, in accordance
with  the  Merger  Agreement,  (i) Union  Oil  contributed  to  a
subsidiary of Pure Resources substantially all of its oil and gas
exploration  and production assets in the Permian Basin  and  San
Juan  Basin  areas of Texas, New Mexico and Colorado in  exchange
for  32,708,067 shares of Pure Common Stock, and (ii) Merger  Sub
merged  with and into Titan and became a wholly-owned  subsidiary
of   Pure   Resources  (the  "Merger").   In  the  Merger,   each
outstanding  share  of common stock of Titan, other  than  shares
owned  by  Titan  or any wholly owned subsidiary  of  Titan,  was
converted  into  the right to receive .4302314 of  a  share  Pure
Common  Stock.   As  a result, the former stockholders  of  Titan
became  entitled  to receive upon conversion of  their  shares  a
total  of  17,290,932 shares of Pure Common  Stock.   The  Merger
Agreement contains certain indemnification provisions under which
Pure  Resources and Union Oil have agreed to indemnify each other
for  certain  liabilities that may arise out of their  respective
businesses.   In  addition, Pure Resources  has  agreed  to  make
certain  tax  benefit payments to Union Oil if  the  transactions
contemplated by the Merger Agreement do not qualify  as  tax-free
under  relevant federal income tax provisions, which  obligations
may be paid in cash or in shares of Pure Common Stock.

     In  connection  with  the transactions contemplated  by  the
Merger Agreement, on December 13, 1999, Pure Resources, Union Oil
and   Jack  D.  Hightower  entered  into  a  stockholders  voting
agreement,  which  was subsequently amended and  restated  as  of
April  10,  2000  (as so amended, the "Voting Agreement"),  which
became  effective  upon  the closing of the  Merger.   Under  the
Voting Agreement, Union Oil and Mr. Hightower have agreed to vote
their shares of Pure Resources capital stock to cause two persons
designated by Mr. Hightower, and up to six persons designated  by
Union  Oil,  to be elected to Pure Resources' board of directors.
Mr. Hightower was President, Chief Executive Officer and Chairman
of  the  Board  of  Titan, and is now President, Chief  Executive
Officer  and Chairman of the Board of Pure Resources.  Under  the
Voting Agreement, Mr. Hightower has agreed to vote his shares  to
elect  to  the Pure Resources board (a) five designees  of  Union
Oil, if Union Oil owns greater than 50% of Pure Common Stock; (b)
four  designees of Union Oil, if Union Oil owns greater than  35%
but  not more than 50% of Pure Common Stock; or (c) two designees
of  Union  Oil, if Union Oil owns greater than 10% but  not  more
than  35%.  In addition, Union Oil and Mr. Hightower have  agreed
that, if necessary to satisfy an independent director requirement
of  the  New York Stock Exchange or other exchange on  which  the
Pure  Common  Stock is traded, Union Oil and Mr.  Hightower  will
cooperate  to  select an additional director who  satisfies  such
requirements,  failing which Union Oil will  have  the  right  to
designate  such  director  subject to Mr.  Hightower's  approval,
which may not be unreasonably withheld.

     Union  Oil  has the right to approve the nomination  of  the
directors  designated by Mr. Hightower, other than Mr.  Hightower
himself,  which  approval may not be unreasonably  withheld.   No
more  than  two of the persons designated by Union Oil under  the
agreement  may  be affiliates of Union Oil.  In  the  event  that
Union  Oil  is entitled to designate three or more persons  under
the agreement, one of the Union Oil affiliates designated must be
approved  by  Mr.  Hightower,  and any  non-Union  Oil  affiliate
designated must be approved by Mr. Hightower.  In each case,  Mr.
Hightower's approval may not be unreasonably withheld.

                              2
<PAGE>

     The  Voting  Agreement will terminate if Union Oil  and  its
affiliates beneficially own less than 10% of the outstanding Pure
Common  Stock  or Mr. Hightower ceases to be the Chief  Executive
Officer of Pure Resources.

     The  foregoing  summaries of the Merger  Agreement  and  the
Voting Agreement are qualified in their entirety by reference  to
copies   of   the  Merger  Agreement  and  the  Voting  Agreement
incorporated  as  Exhibits  A  and  B  ,  respectively,  to  this
Statement, which are incorporated herein in by reference.

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

     As a result of consummation of the transactions contemplated
by  the Merger Agreement and the Voting Agreement, Union Oil owns
directly approximately 65.4% of the outstanding Pure Common Stock
and  has  the  ability to designate a majority of  the  Board  of
Directors.   As  such,  the assets, liabilities  and  results  of
operations  are included in the consolidated financial statements
of  Unocal  and  its subsidiaries.  Of the eight members  of  the
Board of Directors of Pure Resources, Timothy H. Ling and Darrell
D.  Chessum are executive officers of Unocal and Union  Oil,  and
Graydon Laughbaum and H. D. Maxwell are former employees of Union
Oil  or  other Unocal affiliates.  In addition, Graydon Laughbaum
provides consulting services to Unocal and its subsidiaries.   In
addition,  Unocal has agreed with Mr. Hightower under the  Voting
Agreement to elect Keith Covington and Herbert C. Williamson, III
as  directors,  as well as Mr. Hightower and his other  designee,
George Staley.

      Union Oil entered into the Merger Agreement to combine  its
Permian  and  San  Juan basin oil and gas assets  with  those  of
Titan.   Unocal and Union Oil intend to review and analyze  on  a
continuing basis their investment in Pure Resources in  order  to
determine  whether stockholder value for Unocal  stockholders  is
better  served  by  holding  that  investment,  increasing   that
investment  by acquisitions of additional shares of  Pure  Common
Stock in the market or otherwise, disposing of or monetizing that
investment  or  recapitalizing  or otherwise  restructuring  that
investment.   These reviews and analyses will  be  based  upon  a
variety of factors, including, without limitation, the price  of,
and  other market conditions relating to, the Pure Common  Stock,
subsequent  developments affecting Pure Resources,  the  business
and  prospects of Pure Resources, other investment  and  business
opportunities  available to Unocal and Union Oil,  general  stock
market  and economic conditions and other factors deemed relevant
from time to time.

      Except  as set forth in Items 3, 4 and 6 of this Statement,
Unocal  and  Union  Oil have no present plans or  proposals  that
relate to or that would result in any of the actions as specified
in  clauses  (a)  through (j) of Item 4 of Schedule  13D  of  the
Exchange Act of 1934, as amended.

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

(a)  Reference  is made to the applicable cover pages for  Unocal
     and  Union Oil for information concerning (i) the number  of
     shares of Pure Common Stock beneficially owned by Unocal and
     Union  Oil,  and  (ii)  the percentage of  outstanding  Pure
     Common Stock beneficially owned by Unocal and Union Oil,  in
     each case as of the date of this filing.

(b)  Union  Oil  and, by virtue of its ownership  of  Union  Oil,
     Unocal have sole voting and investment power with respect to
     32,709,067 shares of Pure Common Stock, which as of the date
     hereof  represent  approximately 65.4%  of  the  outstanding
     shares  of Pure Common Stock.  In addition,
                                3
<PAGE>

     pursuant to  the
     Voting Agreement described in Item 3 above, Unocal and Union
     Oil  may be deemed to share voting power with respect to the
     1,950,335 shares of Pure Common Stock that may be deemed  to
     be  beneficially  owned by Jack D. Hightower,  which  number
     includes  33,141  shares subject to stock options  that  are
     currently  exercisable.  These shares represent an aggregate
     of approximately 3.9% of the currently outstanding shares of
     Pure  Common Stock.  In addition to the foregoing,  Jack  D.
     Hightower  currently has employee stock options to  purchase
     an  additional 1,800,000 shares of Pure Common Stock,  which
     vest  and become exercisable in one-third increments on  May
     25,  2001, May 25, 2002 and May 25, 2003.  These shares,  if
     the  options  are exercised, would also be  subject  to  the
     Voting  Agreement, and thus Unocal and Union  Oil  would  be
     deemed  to share voting power with respect to those  shares.
     Union  Oil  and Unocal disclaim any beneficial ownership  of
     any shares or options owned by Jack D. Hightower.

(c)  During the past sixty days, neither of Unocal nor Union  Oil
     has  acquired  or disposed of beneficial ownership  of  Pure
     Common Stock except as described herein.

(d)  Not applicable.

(e)  Not applicable.

Item 6.  Contracts, Arrangements, Understandings or
-------  ------------------------------------------
         Relationships With Respect to Securities of the
         ------------------------------------------------
         Issuer:
         -------

       In  addition  to  the  Merger  Agreement  and  the  Voting
Agreement,  the  following  agreements  were  entered   into   in
connection with the Merger Agreement.

           Business  Opportunity Agreement.  Simultaneously  with
the  execution of the Merger Agreement, Union Oil, Pure Resources
and   Titan  entered  into  a  Business  Opportunities  Agreement
pursuant  to  which Pure Resources has agreed,  except  with  the
consent  of  Union  Oil,  which  it  may  withhold  in  its  sole
discretion,  that  Pure Resources and its subsidiaries  will  not
engage  in  any  business other than the E&P Business  (described
below) and will not pursue any business opportunity that involves
any  direct  or  indirect ownership interest  in  any  properties
located outside of a designated area that includes all of Kansas,
New  Mexico  and Oklahoma, portions of southern and  southeastern
Colorado and western Arkansas and onshore Texas, except for areas
of  East  Texas.   For purposes of the agreement, "E&P  Business"
means  generally  the  oil  and  gas  exploration,  exploitation,
development and production business, and it does not include  the
oilfield   service  business.   In  the  Business   Opportunities
Agreement, Pure Resources agreed that it will have no interest or
expectancy  in  any business opportunity that  does  not  consist
exclusively of the E&P Business within the designated areas.  The
provisions described in this paragraph will terminate when  Union
Oil  no longer owns at least 35% of the ordinary voting power for
the election of Pure Resources directors.

     Pure  Resources  also  agreed in the Business  Opportunities
Agreement  that  Union Oil, its affiliates, its  board  designees
under  the  Voting  Agreement described  above  in  Item  3,  and
companies  in which Union Oil has an interest, which  participate
with  Union  Oil  or  of which a board designee  is  a  director,
officer  or  employee shall not be restricted by the relationship
between  Union Oil and Pure Resources or otherwise from  engaging
in  any  business  even  though it is  in  competition  with  the
business or activities of Pure Resources or its subsidiaries,  so
long as their actions do not conflict with specified standards of
conduct,  which are summarized below.  The Business Opportunities
Agreement  does  not
                            4

<PAGE>

affirmatively restrict Union Oil's  business activities,
including within the designated areas.

     The  parties  also have agreed in the Business Opportunities
Agreement  that,  as long as the activities  of  Union  Oil,  its
affiliates  or  board  designees or other related  companies  are
conducted  in accordance with the specified standards, which  are
summarized in the next paragraph:

     -     Union Oil, its affiliates or board designees or  other
           related companies will not have to offer Pure
           Resources or any of its subsidiaries any business
           opportunity;

     -     Pure Resources will have no interest or expectancy in
           any business opportunity pursued by Union Oil, its
           affiliates and board designees and related companies;
           and

     -     Pure  Resources has waived any claim that any business
           opportunity pursued by Union Oil, its affiliates or
           board designees or any related company constitutes a
           corporate opportunity of Pure Resources or any of its
           subsidiaries  that should have been presented to Pure
           Resources.

     The   standards  specified  in  the  Business  Opportunities
Agreement  generally provide that Union Oil, its  affiliates  and
board   designees  and  related  companies  must  conduct   their
businesses through the use of their own personnel and assets  and
not  with  the use of any personnel or assets of Pure  Resources.
The  Business  Opportunities Agreement will  not  allow  a  board
designee of Union Oil to usurp a corporate opportunity solely for
his  or  her  personal benefit, as opposed to pursuing,  for  the
benefit  of  Union Oil, an affiliate or Union Oil or any  related
company,   an  opportunity  in  accordance  with  the   specified
standards.

     Non-Dilution Agreement. Simultaneously with the execution of
the Merger Agreement, Pure Resources and Union Oil entered into a
Non-Dilution  Agreement under which Union Oil has certain  rights
to  maintain  its percentage ownership of Pure Resources  in  the
event  of future issuances of equity by Pure Resources.  If  Pure
Resources  issues capital stock, other than common  stock  issued
under  board-approved incentive plans, for cash or credit,  Union
Oil  will have the right to purchase or subscribe for the  number
or amount of such capital stock equal to its ownership percentage
of  Pure  Resources, up to 65.4%, at the same price at which  the
capital stock is being issued.  Pure Resources must provide Union
Oil  with notice of an issuance subject to this preemptive  right
at  least 10 days prior to the issuance and, if Union Oil  elects
to  exercise  the right, it must do so in such a way  as  not  to
delay  pricing and closing of the issuance.  The preemptive right
given  by  Pure  Resources  with respect  to  any  issuance  will
terminate  if  unexercised within 10 days after  receipt  of  the
notice of the issuance of the capital stock.

     If  Pure Resources issues any capital stock in exchange  for
property other than cash or credit, Union Oil will have the right
to  purchase from Pure Resources the additional number of  shares
of  capital  stock necessary to enable Union Oil to maintain  its
ownership  percentage  in  Pure Resources,  up  to  65.4%.   Pure
Resources must give Union Oil written notice of the issuance  not
later  than  20 days prior to such issuance, and Union  Oil  will
have  30  days from the date of the issuance to elect to exercise
its  rights by giving written notice to Pure Resources.  The cash
price per share to be paid by Union Oil for the additional shares
of  capital stock will be the market trading price per  share  of
Pure  Common Stock at the time of the issuance or in the case  of
other  capital  stock, as determined in good faith  by  the  Pure
Resources board of directors.

     Shares  of  Pure Common Stock issued to Union Oil under  the
Non-Dilution  Agreement will be
                                5
<PAGE>

entitled to the benefits of the Registration  Rights Agreement
described below.  Pure Resources also has agreed that if shares
are issued because of the Non-Dilution Agreement, Pure Resources
will cause those shares to  be listed  for  trading or quotation
on any securities exchanges or quotation systems on which the
securities of that class are then listed for trading or quotation.

     Registration Rights Agreement.  Pure Resources entered  into
a  Registration  Rights Agreement with Union  Oil  simultaneously
with  execution of the Merger Agreement.  The Registration Rights
Agreement  provides that at any time and from time to time  after
120  days following the closing date of the Merger, but  no  more
than  one time in a twelve month period, Union Oil will have  the
right  to  require  Pure  Resources to effect  a  Securities  Act
registration of all or a portion of the Pure Common  Stock  owned
by Union Oil.  If Union Oil demands registration of less than all
of  the  Pure Resources shares it owns, the portion  must  be  at
least  (a) 4,300,000 shares, as adjusted for any stock dividends,
splits  or otherwise, or (b) shares having an estimated aggregate
offering  price to the public of at least $50 million,  whichever
is  lower.  The Registration Rights Agreement also provides Union
Oil  with piggyback registration rights, which give Union Oil the
right  to  include  shares of Pure Common Stock  held  by  it  in
registrations initiated by Pure Resources or by any other  holder
of Pure Common Stock.

     The  Registration  Rights Agreement provides  for  customary
indemnities  by  Pure  Resources in favor  of  persons  including
shares  in  a  registration covered by  the  Registration  Rights
Agreement,  and by such persons in favor of Pure Resources,  with
respect   to   information  to  be  included  in   the   relevant
registration statement.  Pure Resources will bear the  reasonable
costs  of registering and offering for sale any Pure Common Stock
offered  in  a  registration covered by the  Registration  Rights
Agreement,  including costs and expenses of Union  Oil's  counsel
not  to  exceed $50,000 per registration. Union Oil will pay  all
applicable underwriting discounts and commissions.

      The  foregoing  summaries  of  the  Business  Opportunities
Agreement,   Non-Dilution  Agreement,  and  Registration   Rights
Agreement are qualified in their entirety by reference to  copies
of   such  agreements  incorporated  as  Exhibits  C,  D  and  E,
respectively,  to  this Statement, which incorporated  herein  by
reference.

Item 7.   Material to be Filed as Exhibits:
-----------------------------------------------

Exhibit A:      Agreement  and  Plan of Merger among  Union  Oil,
          Titan,  Pure Resources (formerly named Titan  Resources
          Holdings, Inc.), and Merger Sub dated December 13, 1999
          (incorporated herein by reference to Exhibit 2.3 to the
          Schedule 13D filed by Unocal and Union Oil with respect
          to Titan on December 23, 1999); Amendment No. 1 thereto
          dated  April 14, 2000 (incorporated herein by reference
          to Exhibit 2.2 to the Registration Statement on Form S-
          4 filed by Pure Resources (File No. 333-34970)).

Exhibit B:     Amended and Restated Stockholders Voting Agreement
          dated April 10, 2000, by and among Pure Resources,
          Union Oil and Jack D. Hightower (incorporated by
          reference to Exhibit 10.20 to Titan Exploration, Inc.'s
          Annual Report on Form 10-K, as amended, as filed on
          April 12, 2000 (File No. 000-21843)).

Exhibit C:      Business Opportunities Agreement among Union Oil,
          Titan,  Merger  Sub and Pure Resources  (fomerly  named
          Titan Resources Holdings, Inc.) dated December 13, 1999
          (incorporated herein by reference to Exhibit 2.4 to the
          Schedule 13D filed by Unocal and Union Oil with respect
          to Titan on December 23, 1999 (File No. 005-47939)).

                                  6

<PAGE>

Exhibit D:      Non-Dilution  Agreement dated December  13,  1999
          between  Pure Resources (formerly named Titan Resources
          Holdings,  Inc.) and Union Oil (incorporated herein  by
          reference to Exhibit 10.21 to Titan Exploration, Inc.'s
          Annual  Report on Form 10-K, as amended,  as  filed  on
          April 12, 2000 (File No. 000-21843)).

Exhibit E:      Registration Rights Agreement among Union Oil and
          Pure   Resources   (formerly  named   Titan   Resources
          Holdings,  Inc.) dated December 13, 1999  (incorporated
          herein by reference to Exhibit 10.1 to the Registration
          Statement on Form S-4 filed by Pure Resources (File No.
          333-34970)).

Exhibit F:     Joint Filing Agreement.

                                7

<PAGE>

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

Date:  June 5, 2000      UNOCAL CORPORATION


                         By: /s/ Douglas M. Miller
                          Name:   Douglas M. Miller
                          Title:  Vice President, Corporate
                                  Development

                         UNION   OIL   COMPANY    OF
                         CALIFORNIA


                         By: /s/ Douglas M. Miller
                           Name:  Douglas M. Miller
                           Title: Vice President, Corporate
                                  Development

                               8

<PAGE>

                                                       Schedule I

                DIRECTORS AND EXECUTIVE OFFICERS
                       UNOCAL CORPORATION

Name and Business      Citizenship  Position and Occupation
Address*

Roger C. Beach         U.S.A.       Director, Chairman of the
                                    Board of Directors and Chief
                                    Executive Officer, Unocal
                                    Corporation

John W. Amerman        U.S.A.       Director, Unocal Corporation,
2101 Rosecrans Ave.,                Former Chairman of the Board
Suite 6280                          and Chief Executive Officer,
El Segundo, CA  90245               Mattel, Inc.

John W. Creighton, Jr. U.S.A.       Director, Unocal Corporation,
Madrona Investment                  Former President and Chief
Group                               Executive Officer,
1000 Second Avenue,                 Weyerhaeuser Company
Suite 3700
Seattle, WA  98104

James W. Crownover     U.S.A.       Director, Unocal Corporation,
c/o McKinsey &                      Former Director, McKinsey &
Company, Inc.                       Company, Inc.
909 Fannin, Suite 3675
Houston, Texas  77010

Frank C. Herringer     U.S.A.       Director, Unocal Corporation,
Transamerica                        Chairman and Chief Executive
Corporation                         Officer, Transamerica
600 Montgomery Street               Corporation
San Francisco, CA
94111

Timothy H. Ling        U.S.A.       Director, Executive Vice
                                    President, North American
                                    Energy Operations, and Chief
                                    Financial Officer, Unocal
                                    Corporation

Donald B. Rice         U.S.A.       Director, Unocal Corporation,
UroGenesys, Inc.                    President and Chief Executive
1701 Colorado Avenue                Officer, UroGenesys, Inc.
Santa Monica, CA
90404

Kevin W. Sharer        U.S.A.       Director, Unocal Corporation,
Amgen Inc.                          President and Chief Operating
One Amgen Center                    Officer, Amgen Inc.
Thousand Oaks, CA
91320-1789
                                9
<PAGE>


Marina V.N. Whitman    U.S.A.       Director, Unocal Corporation,
Institute of Public                 Professor of Business
Policy Studies                      Administration and Public
University of Michigan              Policy, University of
411 Lorch Hall                      Michigan
Ann Arbor, MI  48109-
1220

Charles R. Williamson  U.S.A.      Director, Executive Vice
                                   President, International
                                   Energy Operations, Unocal
                                   Corporation

Joe D. Cecil           U.S.A.      Vice President and
                                   Comptroller, Unocal
                                   Corporation

Dennis P.R. Codon      U.S.A.      Vice President, Chief Legal
                                   Officer and General Counsel,
                                   Unocal Corporation

Douglas M. Miller      U.S.A.      Vice President, Corporate
                                   Development













*Unless otherwise indicated, the business address of these
individuals is c/o Unocal Corporation at the address shown on the
cover of this Schedule 13D.

                               10
<PAGE>

                DIRECTORS AND EXECUTIVE OFFICERS
                 UNION OIL COMPANY OF CALIFORNIA

Name and Business      Citizenship  Position and Occupation
Address*

Roger C. Beach         U.S.A.       Director, Chairman of the Board
                                    of Directors and Chief
                                    Executive Officer, Union Oil
                                    Company of California

Timothy H. Ling        U.S.A.       Director, Executive Vice
                                    President, North American
                                    Energy Operations, and Chief
                                    Financial Officer, Union Oil
                                    Company of California

Charles R. Williamson  U.S.A.       Director, Executive Vice
                                    President, International Energy
                                    Operations, Union Oil Company
                                    of California

Joe D. Cecil           U.S.A.       Vice President and Comptroller,
                                    Union Oil Company of California

Dennis P.R. Codon      U.S.A.       Vice President, Chief Legal
                                    Officer and General Counsel,
                                    Union Oil Company of California

Douglas M. Miller      U.S.A.       Vice President, Corporate
                                    Development, Union Oil Company
                                    of California




*Unless otherwise indicated, the business address of these
individuals is c/o Unocal Corporation at the address shown on the
cover of this Schedule 13D.
                               11

<PAGE>

                                         Exhibit F

              JOINT FILING AGREEMENT

      The undersigned each agree as follows:   (i)
that certain statement on Schedule 13D relating to
the  Common Stock, par value $0.01 per  share,  of
Pure  Resources, Inc., a Delaware corporation,  is
filed  on  behalf  of  each  of  them,  (ii)  such
Statement  on Schedule 13D is adopted by  each  of
them,   (iii)  all  future  amendments   to   such
Statement  on  Schedule 13D will,  unless  written
notice  to  the contrary is delivered as described
below, be jointly filed on behalf of each of them,
and  (iv) the provisions of Rule 13d-1(f)(1) under
the  Securities Exchange Act of 1934, as  amended,
apply  to  each  of them.  This Agreement  may  be
terminated with respect to the obligation to  file
jointly  future  amendments to such  Statement  on
Schedule  13D  as  to any of the undersigned  upon
such  person giving written notice thereof to each
of  the  other  persons signatory hereto,  at  the
principal office thereof.

     EXECUTED as of June 5, 2000.

                         UNOCAL CORPORATION

                         By: /s/ Douglas M. Miller
                          Name:   Douglas M. Miller
                          Title:  Vice President, Corporate
                                  Development

                         UNION   OIL   COMPANY    OF
                         CALIFORNIA

                         By: /s/ Douglas M. Miller
                           Name:  Douglas M. Miller
                           Title: Vice President, Corporate
                                  Development



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