UNOCAL CORP
11-K, 1999-06-30
CRUDE PETROLEUM & NATURAL GAS
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                                   UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    FORM 11-K


                 Annual Report Pursuant to Section 15(d) of the
                         Securities Exchange Act of 1934



(Mark One)

[X]        Annual report pursuant to Section 15(d) of the Securities Exchange
           Act of 1934
           For the fiscal year ended December 31, 1998


                                       Or


[  ]       Transition report pursuant to Section 15(d) of the Securities
           Exchange Act of 1934
           For the transition period from              to
                                          ------------    --------------

           Commission file number   1-8483


A. Full title of the plan and the address of the plan, if different from that of
the issuer named below:


                  MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN


      B. Name of  issuer of the  securities  held  pursuant  to the Plan and the
      address of its principal executive office:

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






<PAGE>



                        INDEX TO FINANCIAL STATEMENTS OF
                  MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN


        The following  financial  statements reflect the status of the Molycorp,
Inc.  401(k)  Retirement  Savings Plan as of December 31, 1998 and 1997, and the
results of its transactions for each of the years then ended.


                                                                     Page Number



Report of Independent Accountants                                              2

Financial Statements:

     Statements of Net Assets Available for Benefits
     with Fund Information                                                   3-4

     Statements of Changes in Net Assets Available for Benefits
     with Fund Information                                                   5-6

     Notes to Financial Statements                                          7-10

Supplemental Schedules*:

     Item 27(a) - Schedule of Assets Held for Investment Purposes             12

     Item 27(d) - Schedule of Reportable Transactions                         13

Exhibit Index                                                                 14




* Supplemental  schedules  required by the Employee  Retirement  Income Security
Act of 1974 that are omitted are not applicable to the Molycorp, Inc. 401(k)
Retirement Savings Plan.





<PAGE>



                        REPORT OF INDEPENDENT ACCOUNTANTS








The Administrative Committee of the Molycorp, Inc.401(k)Retirement Savings Plan:



         In our opinion, the accompanying statements of net assets available for
benefits  and the  related  statements  of changes in net assets  available  for
benefits present fairly, in all material respects,  the net assets available for
benefits of the Molycorp,  Inc. 401(k)  Retirement  Savings Plan (the "Plan") at
December 31, 1998 and 1997, and the changes in net assets available for benefits
for the years ended  December  31, 1998 and 1997 in  conformity  with  generally
accepted   accounting   principles.   These   financial   statements   are   the
responsibility  of the Plan's  management;  our  responsibility is to express an
opinion on these  financial  statements  based on our audits.  We conducted  our
audits of these  statements  in  accordance  with  generally  accepted  auditing
standards which require that we plan and perform the audit to obtain  reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for the opinion expressed above.



        Our audits were  conducted  for the purpose of forming an opinion on the
basic  financial  statements  taken as a whole.  The  supplemental  schedules of
assets held for investment  purposes and reportable  transactions  are presented
for the purpose of additional  analysis and are not a required part of the basic
financial   statements  but  are  supplementary   information  required  by  the
Department of Labor's Rules and Regulations  for Reporting and Disclosure  under
the  Employee  Retirement  Income  Security  Act  of  1974.  These  supplemental
schedules are the responsibility of the Plan's management.  The Fund Information
in the  statement of net assets  available  for  benefits  and the  statement of
changes in net assets  available  for  benefits  is  presented  for  purposes of
additional  analysis  rather than to present the net assets  available  for plan
benefits and changes in net assets available for plan benefits of each fund. The
supplemental  schedules and Fund Information have been subjected to the auditing
procedures  applied in the audits of the basic financial  statements and, in our
opinion,  are fairly  stated in all  material  respects in relation to the basic
financial statements taken as a whole.











PricewaterhouseCoopers LLP
Los Angeles, California
June 18, 1999

                                       2

<PAGE>
<TABLE>
<CAPTION>
                                                Molycorp, Inc. 401(k) Retirement Savings Plan
                                    Statement of Net Assets Available for Benefits with Fund Information
                                                              December 31, 1998


                                                                       Partcipant Directed
                                             ------------------------------------------------------------------------
                                                Unocal                                         Low
                                                Common        S&P 500      George Putnam    Volatility       Money
                                                 Stock       Index Fund   Fund of Boston      Fund        Market Fund
                                             ------------   ------------   ------------   ------------   ------------
Assets
  Investments at fair value (Note 2)
<S>                                          <C>            <C>            <C>            <C>            <C>
       Unocal Common Stock ...............   $      3,965   $       --     $       --     $       --     $       --
       Shares of registered
        investment companies:
       S&P 500 Index Fund ................           --            2,603           --             --             --
       George Putnam Fund of Boston ......           --             --             --             --             --
       Low Volatility Fund ...............           --             --             --          31,751            --
       Money Market Fund .................           --             --             --             --          30,506
       New Opportunities Fund ............           --             --             --             --             --
       Voyager Fund ......................           --             --             --             --             --
                                             ------------   ------------   ------------   ------------   ------------
            Total investments.............          3,965          2,603           --          31,751         30,506


Net assets available for benefits.........   $      3,965   $      2,603   $       --     $    31,751    $    30,506
                                             ============   ============   ============   ============   ============
</TABLE>

<TABLE>
<CAPTION>
                                               Participant Directed
                                             ---------------------------
                                                 New
                                             Opportunities     Voyager
                                                 Fund           Fund          Total
                                             ------------   ------------   ------------
Assets
  Investments at fair value (Note 2)
<S> .......................................   <C>            <C>           <C>
       Unocal Common Stock ................   $       --     $       --    $      3,695
      Shares of registered
        investment companies:
       S&P 500 Index Fund .................           --             --           2,603
       George Putnam Fund of Boston .......           --             --             --
       Low Volatility Fund ................           --             --          31,751
       Money Market Fund ..................           --             --          30,506
       New Opportunities Fund .............         6,234            --           6,234
       Voyager Fund .......................           --             --             --
                                             ------------   ------------   ------------
            Total investments .............         6,234            --          75,059


Net assets available for benefits .........  $      6,234   $        --    $     75,059
                                             ============   ============   ============
<FN>
   The accompanying notes are an integral part of these financial statements.
</FN>
</TABLE>
                                       3
<PAGE>
<TABLE>
<CAPTION>
                                                MOLYCORP, INC. 401(K) RETIREMENT SAVINGS PLAN
                                    STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION
                                                              DECEMBER 31, 1997


                                                                                              Participant Directed
                                                                     ---------------------------------------------------------------
                                                                                         Unocal
                                                                       Fidelity          Common             GIC
                                                                          Fund           Stock              Fund             Total
                                                                     -----------       ---------          --------         ---------
ASSETS
   Investments at fair value (Note 2)
      Shares of registered investment companies
<S>                                                                 <C>                <C>                <C>               <C>
         Fidelity Puritan Mutual Fund ....................          $  3,362           $     --           $     --          $  3,362
      Unocal Common Stock ................................                --             47,003                 --            47,003
                                                                    --------           --------           --------          --------
                                                                       3,362             47,003                 --            50,365

   Investments at contract value (Note 3)
      Bank of California Employee Benefit
        Investment Contract Fund .........................                --                 --              6,622             6,622
                                                                    --------           --------           --------          --------
            Total investments ............................             3,362             47,003              6,622            56,987

Cash .....................................................                --                  1                  1                 2
                                                                    --------           --------           --------          --------
Net assets available for benefits ........................          $  3,362           $ 47,004            $ 6,623          $ 56,989
                                                                    ========           ========           ========          ========
<FN>
   The accompanying notes are an integral part of these financial statements.
</FN>
</TABLE>
                                       4

<PAGE>
<TABLE>
<CAPTION>


                                  MOLYCORP, INC. 401(K) RETIREMENT SAVINGS PLAN
                 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION
                                  For The Year Ended December 31, 1998

                                                                              Participant Directed
                                                                    ----------------------------------------------------------------
                                                                     Fidelity    Common        GIC        S&P 500     George Putnam
                                                                       Fund      Stock         Fund      Index Fund   Fund of Boston
                                                                    ---------   ---------   ----------   ----------   --------------
Additions to net assets attributed to:
   Investment income
       Net appreciation(depreciation)
<S>                                                                 <C>         <C>         <C>          <C>          <C>
          in fair value of investments......................        $    348    $ (6,526)    $    --      $    414     $        --
        Interest ...........................................              --         116         277            --              --
        Dividends ..........................................              70         794           5            --              --
                                                                    ---------   ---------   ----------   ----------   --------------
          Total investment income/(loss)....................             418      (5,616)        282           414

   Contributions
     Participant ...........................................           1,324       6,837       3,678            --              --
                                                                    ---------   ---------   ----------   ----------   --------------
      Total contributions ..................................           1,324       6,837       3,678            --              --


         Total additions ...................................           1,742       1,221       3,960           414              --


Net Increase/(decrease) prior to interfund transfers........           1,742       1,221       3,960           414              --

Interfund Transfers ........................................          (5,104)    (44,260)    (10,583)        2,189              --
                                                                    ---------   ---------    ---------   ----------   --------------
         Net Increase/(decrease)............................          (3,362)    (43,039)    ( 6,623)        2,603              --

Net assets available for benefits:
   Beginning of year .......................................           3,362      47,004       6,623            --
                                                                    ---------   ---------   ----------   ----------   --------------
   End of year .............................................        $     --    $  3,965    $     --     $   2,603     $        --
                                                                    =========   =========   ==========   ==========   ==============
</TABLE>

<TABLE>
<CAPTION>
                                                                                Participant Directed
                                                                    -----------------------------------------------
                                                                       Low       Money         New
                                                                    Volatility   Market   Opportunities    Voyager
                                                                       Fund       Fund         Fund          Fund          Total
                                                                    ---------   ---------   ----------   ----------   --------------
Additions to net assets attributed to:
   Investment income
       Net appreciation(depreciation)
<S>                                                                 <C>         <C>         <C>          <C>          <C>
          in fair value of investments......................        $    410    $     --     $ 1,175      $     --     $     (4,179)
        Interest ...........................................              --          --          --            --              393
        Dividends ..........................................              --         957         193            --            2,019
                                                                    ---------   ---------   ----------   ----------   --------------
          Total investment income/(loss)....................             410         957       1,368            --           (1,767)

   Contributions
     Participant ...........................................           2,022       5,976          --            --           19,837
                                                                    ---------   ---------   ----------   ----------   --------------
      Total contributions ..................................           2,022       5,976          --            --           19,837


         Total additions ...................................           2,432       6,933        1,368           --           18,070


Net Increase/(decrease) prior to interfund transfers........           2,432       6,933        1,368           --           18,070

Interfund Transfers ........................................          29,319      23,573        4,866           --             --
                                                                    ---------   ---------    ---------   ----------   --------------
         Net Increase/(decrease)............................          31,751      30,506        6,234           --           18,070

Net assets available for benefits:
   Beginning of year .......................................              --          --           --           --           56,989
                                                                    ---------   ---------   ----------   ----------   --------------
   End of year .............................................        $ 31,751    $ 30,506    $   6,234    $   2,603     $     75,059
                                                                    =========   =========   ==========   ==========   ==============
<FN>
   The accompanying notes are an integral part of these financial statements.
</FN>

</TABLE>
                                       5
<PAGE>
<TABLE>
<CAPTION>

                                  MOLYCORP, INC. 401(K) RETIREMENT SAVINGS PLAN
                 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION
                                  For The Year Ended December 31, 1997

                                                                              Participant Directed
                                                                    -----------------------------------------------
                                                                     Fidelity    Common        GIC
                                                                       Fund      Stock         Fund         Total
                                                                    ---------   ---------   ----------   ----------
Additions to net assets attributed to:
   Investment income
       Net appreciation(depreciation)
<S>                                                                 <C>         <C>         <C>          <C>
          in fair value of investments......................        $  1,114    $ (2,341)    $    --      $ (1,227)
        Interest ...........................................             359          17         201           577
        Dividends ..........................................              --         870          --           870
                                                                    ---------   ---------   ----------   ----------
          Total investment income/(loss)....................           1,473      (1,454)        201           220

   Contributions
     Participant ...........................................              --       6,538       5,084        11,622
                                                                    ---------   ---------   ----------   ----------
      Total contributions ..................................              --       6,538       5,084        11,622


         Total additions ...................................           1,473       5,084       5,285        11,842

Deductions from net assets attributed to:
     Participant withdrawals & distributions                          25,527       1,738          --        27,265
                                                                    ---------   ---------    ---------   ----------
       Total deductions                                               25,527       1,738          --        27,265

         Net Increase/(decrease)............................         (24,054)      3,346       5,285       (15,423)

Net assets available for benefits:
   Beginning of year .......................................          27,416      43,658       1,338        72,412
                                                                    ---------   ---------   ----------   ----------
   End of year .............................................        $  3,362    $ 47,004    $  6,623     $  56,989
                                                                    =========   =========   ==========   ==========
<FN>
   The accompanying notes are an integral part of these financial statements.
</FN>

</TABLE>
                                       6
<PAGE>

                MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN
                          NOTES TO FINANCIAL STATEMENTS

NOTE 1 - DESCRIPTION OF THE PLAN

General
- -------

      The  Molycorp,  Inc.  401(k)  Retirement  Savings  Plan (the  "Plan") is
sponsored by Molycorp, Inc. (the "company"), an indirect wholly owned subsidiary
of  Unocal  Corporation.  The  Plan  provides  for  voluntary  contributions  by
participants.  Prior to  August 1,  1998,  all funds  were  with  Union  Bank of
California  for the exclusive  benefit of Plan  participants  until  distributed
after  termination of employment.  Each  individual  participant  was allowed to
choose how their funds are invested from among three investment options.

        Effective August 1, 1998, the Molycorp,  Inc. 401(k) Retirement  Savings
Plan changed its trustee and  administrator  from Union Bank of  California  and
William  Mercer,  respectively.  The new  trustee  and  administrator  is Putnam
Fiduciary Trust Company (the "Trustee").  Each individual participant is allowed
to choose how their funds are invested from a range of  investment  fund options
and Unocal  Corporation  common stock. The Plan is subject to certain provisions
of the Employee  Retirement  Income  Security Act of 1974 ("ERISA") as a defined
contribution plan.

        The Molycorp  401(k)  Retirement  Savings Plan booklet dated December 1,
1996  replaces  the April 1, 1991 booklet and  constitutes  part of a prospectus
covering  securities that have been registered under the Securities Act of 1933.
The December 1, 1996 booklet can be referenced for other  information  about the
Plan.

Participation
- -------------

        Collective  bargaining  unit employees at the Questa or York  facilities
are  eligible to  participate  in the Plan as of January 1, 1991 if at least six
months  of  service  was  completed   prior  to  January  1,  1991.   Otherwise,
participants  are eligible to participate in the Plan beginning the first of the
calendar quarter that next follows the date the participant completed six months
of service.

Contributions
- -------------

        Voluntary  participant  contributions  to the Plan are made on a pre-tax
basis and cannot  exceed 15 percent of a  participant's  base pay.  The  pre-tax
contributions  are also  known as  401(k)  contributions.  Contributions  cannot
exceed the amount  prescribed  by law and cannot be  calculated on a base pay in
excess of the  amount  allowed  by law.  The Plan  does not  allow for  employer
contributions.

Participant Accounts
- --------------------

        Each   participant's   account  is  credited   with  the   participant's
contributions and the respective  investment earnings of the individual funds as
governed by the participant's investment selection.

Vesting
- -------

        Participants are always 100 percent vested in participant  contributions
and the investment earnings on those contributions.

Payment of Benefits
- -------------------

        On  termination of employment or at such time that  participants  become
eligible to receive  benefits,  participants  may elect to receive their account
balance or defer their  distribution  until a later  date,  but no later than 60
days after the end of the plan year in which the latest of the following occurs:
the participant attains age 65, or two years after the participant's  employment
terminates. If a participant continues to work after age 70-1/2, distribution of
a portion of the  participant's  account  balance is  required by April 1 of the
calendar year following the calendar year in which the  participant  attains age
70-1/2.

                                       7
<PAGE>



                  MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN
                    NOTES TO FINANCIAL STATEMENTS (continued)

Investment Program
- ------------------

    All  contributions  are  held  in  trust  and  invested  by the  Trustee  in
accordance   with  the  option  or  options  elected  by  the   participant.   A
participant's account may be invested in one or any combination of the following
funds administered by the Trustee:

Unocal  Corporation  Common  Stock  Fund  ("Unocal  Common  Stock")  - Funds are
invested in common stock of Unocal Corporation, the company's ultimate parent.

Putnam S&P 500 - This fund invests in a large variety of publicly  traded common
stock.  The fund is designed to mirror the  performance  and  composition of the
Standard & Poor's 500 index.

The George  Putnam  Fund of Boston - The monies in this fund are  invested  in a
diversified group of stocks and bonds.

Putnam Low Volatility Trust Fund - Monies are invested mainly in U.S. government
debt securities.

Putnam Money Market Fund - Investments  are made in a  diversified  portfolio of
high-quality  money market  instruments with an average maturity of less than 90
days.

Putnam New  Opportunities  Fund - Investments  are primarily in common stocks of
companies  within  certain  emerging  industry  groups that offer above  average
potential for growth and a risk for greater price fluctuations.

Putnam  Voyager Fund -  Investments  are in a  combination  of stocks of smaller
companies  expected  to grow  over  time,  as well as  stocks  of  larger,  more
established companies.

Prior to August 1, 1998,  participants' accounts could be invested in one or any
combination of the following  funds  administered  by William Mercer and held by
Union Bank of California:

Fidelity  Puritan  Mutual  Fund - Funds are  invested in shares of a mutual fund
maintained  by a  registered  investment  company  that  invests  in common  and
preferred stocks, as well as bonds, of various U.S. corporations.

Unocal  Corporation  Common  Stock  Fund  ("Unocal  Common  Stock")  - Funds are
invested in common stock of Unocal Corporation, the company's ultimate parent.

Employee  Benefit  Guaranteed  Investment  Contract  Fund  ("GIC")  - Funds  are
invested  in a bank  commingled  trust fund which  holds  fixed-rate  investment
contracts with various insurance companies.

Federal Income Tax Status
- -------------------------

        The company  obtained a ruling dated  December  26,  1996,  from the Los
Angeles  District  Director of the Internal  Revenue Service that the Plan meets
the  requirements  of Section  401(a) of the Internal  Revenue Code of 1986,  as
amended,  and that the Trustee  established  thereunder is entitled to exemption
under the  provisions of such Code;  therefore,  the Plan is not required to pay
any  federal  income  taxes.  Earnings on Plan  accounts  will not be taxable to
participants prior to withdrawal from the Plan.

Withdrawals  from the Plan are generally  subject to federal  income tax.  Also,
in-service withdrawals and withdrawals following termination of employment prior
to retirement may be subject to a 10 percent federal income tax penalty.

                                       8
<PAGE>



                  MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN
                    NOTES TO FINANCIAL STATEMENTS (continued)

Plan Termination
- ----------------

     The  company  expects to  continue  the Plan  indefinitely,  but, as future
conditions cannot be foreseen,  the company may at any time or from time to time
amend or terminate the Plan in whole or in part,  subject to the requirements of
ERISA and other  applicable  laws. An amendment may affect  present,  as well as
future  participants,  but may  not  diminish  the  account  of any  participant
existing on the  effective  date of such  amendment.  The company has no present
intent to terminate the Plan.


NOTE 2 - Summary of Significant Accounting Policies

Basis of Accounting
- -------------------

        The accompanying  financial statements are prepared on the accrual basis
of accounting in conformity with generally accepted  accounting  principles.  In
addition, the following accounting policies are applied:

       a. Purchases and sales of securities are recorded on a trade-date basis.

       b. Dividends are recorded on an ex-dividend basis.

       c. Interest income is recorded on the accrual basis.

       d. Benefits are recorded when paid.

        The Plan  presents in the  statement of changes in net assets  available
for benefits with fund  information the net appreciation  (depreciation)  in the
fair value of its investments which consists of the realized gains or losses and
the unrealized appreciation (depreciation) on those investments.

Valuation of Investments
- ------------------------

       The Plan's investments are stated at fair value except for its investment
contract fund which was valued at contract  value (Note 3). Shares of registered
investment  companies are valued at quoted market prices from national exchanges
which represent the net asset value of shares held by the Plan at year-end.  The
Unocal  common stock is valued at the closing price as reported for the New York
Stock  Exchange   Composite   Transactions   at  December  31,  1998  and  1997,
respectively.  Investments in common trust funds are valued based on information
provided by the Plan's investment  custodions.  The financial  statements of the
common trust funds are audited annually by independent accountants.

Use of Estimates in Preparation of the Financial Statements
- -----------------------------------------------------------

        The  preparation  of financial  statements in conformity  with generally
accepted accounting  principles requires the Plan's management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of contingent  assets and  liabilities  at the dates of the financial
statements  and the reported  amounts of additions  to and  deductions  from net
assets  during the  reporting  periods.  Actual  results could differ from those
estimates.


                                       9

<PAGE>
                  MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN
                    NOTES TO FINANCIAL STATEMENTS (continued)


NOTE 3 - Investments at Contract Value

    Prior to August 1, 1998,  funds that were  invested  in the GIC fund,  which
held fixed-rate  investment  contracts with various  insurance  companies,  were
valued at contract value. The Plan's ownership  interest in this bank commingled
trust  fund  was  based  upon  units  of  equal  value  referred  to as units of
participation.  Each unit of participation represented a proportionate undivided
beneficial  interest in the total value of all investment  contracts  which were
held by the bank  commingled  trust fund.  The number of units of  participation
allocated to the Plan were  determined  by the Trustee on a monthly  basis.  The
crediting interest rate for all outstanding  fixed-rate investment contracts was
 .4881  percent as of December  31,  1997,  and the  average  yield rate for such
contracts was 6.08 percent for the year then ended.


NOTE 4 - Concentration of Risk

       The GIC fund  consisted of a series of  fixed-rate  investment  contracts
with various  insurance  companies.  Although this fund  contained a diversified
portfolio of investment contracts,  the ultimate performance of the contract was
dependent upon the ability of the underlying companies to honor them.


NOTE 5 - Parties-in-interest

        Certain of the Plan's  investments are shares of mutual funds managed by
Putnam  Fidicuary  Trust  Company,  Trustee of the Plan,  as defined by the Plan
Agreement.   Therefore,   these   transactions   qualify  as   party-in-interest
transactions for which a statutory exemption exists.

    The   company,   who  also   qualifies  as  a   party-in-interest,   absorbs
substantially all of the administrative  expenses of the Plan. Such transactions
with the company qualify for a statutory exemption.

                                       10
<PAGE>



                                    SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Committee  appointed by the Board of Directors of the company to administer  the
Plan has duly  caused  this  annual  report to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                   MOLYCORP, INC. 401(k) RETIREMENT SAVINGS PLAN






Date:  June 29, 1999                          By:   /s/ Joe D. Cecil
                                                  ---------------------
                                                  Joe D. Cecil
                                                  Vice President and Comptroller

                                       11
<PAGE>
<TABLE>
<CAPTION>
                                              MOLYCORP, INC. 401(K) RETIREMENT SAVINGS PLAN
                                        ITEM 27(A) - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
                                                              DECEMBER 31, 1998





                                                                           (c)
                                                    Description of Investment
 (a)                               (b)              Including Maturity Date,                              (d)             (e)
          Identity of Issue, Borrower,              Rate of Interest, Collateral,                                     Current
               Lessor or Similar Party              Par or Maturity Value                                Cost           Value
- -----------------------------------------------------------------------------------------------------------------------------------

<S>                                                                                                   <C>             <C>
 **        Unocal Corporation                       Unocal Corporation Common Stock                  $ 4,894         $ 3,965
                                                    (135.845  shares)

  *        Putnam Investments                       S&P 500 Index Fund                                 2,189           2,603
                                                    (89.961   shares)

  *        Putnam Investments                       Putnam Low Volatility Fund                        31,341          31,751
                                                    (2,470.916 shares)

  *        Putnam Investments                       Putnam Money Market Fund                          30,506          30,506
                                                    (35,505.75 shares)

  *        Putnam Investments                       Putnam New Opportunities Fund                      5,060           6,234
                                                    (173.499   shares)
                                                                                                      -------         -------
                                                                                                      $73,990         $75,059
                                                                                                      =======         =======
<FN>
*  Trustee for the Plan and, therefore, a party-in-interest for which a
   statutory exemption exists.

** Sponser  and  employer,  and  therefore,  a  party-in-interest for which a
   statutory exemption exists.
</FN>
</TABLE>
                                       12


<PAGE>
<TABLE>
<CAPTION>

                                                       MOLY CORP, INC. 401(K) RETIREMENT SAVINGS PLAN
                                                     ITEM 27(d) - SCHEDULE OF REPORTABLE TRANSACTIONS (1)
                                                             FOR THE YEAR ENDED DECEMBER 31, 1998





                      (b)Description                                             (f)Expense                 (h)Current
                     of Assets                                                   Incurred                   Value of       (i)Net
                     (Including Interest   (c)Purchase  (d)Selling    (e)Lease   With          (g) Cost     Asset on        Gain
(a)Identity of       Rate and Maturity        Price        Price       Rental    Transaction   of Asset     Transaction     Or
Party Involved       in Case of a loan)                                                                     Date           (loss)
- ------------------------------------------------------------------------------------------------------------------------------------



<S>                                        <C>            <C>                                <C>         <C>             <C>
Union Bank of       Employee Benefit
California           Investment Contrat Fund
(3)                  Purchased 72,185 shares
                     (  35 Transactions)       72,185                                        72,185       72,185

Unocal Corporation  Unocal Corporation
(2)                  Common Stock
                     Purchased 280 shares
                     (7 Transactions)          10,247                                        10,247       10,247

Putnam Investments  Putnam New
(3)                  Opportunity Fund
                     Purchased 107 shares
                     (  2 Transactions)         5,060                                         5,060        5,060

Putnam Investments  Putnam Low
(3)                  Volatility Fund
                     Purchased 2,471 shares
                     (12 Transactions)         31,341                                        31,341       31,341

Putnam Investments  Putnam Money
(3)                  Market Fund
                     Purchased 6,534 shares
                     (   15 Transactions)       6,933                                         6,933        6,933

Union Bank of       Employee Benefit
California           Investment Contrat Fund
(3)                  Sold 81,338 shares
                     (  17 Transactions)                  81,338                             81,338       81,338

Unocal Corporation  Unocal Corporation
(2)                  Common Stock
                     Sold 1,355 shares
                     (1 Transaction)                      46,759                             41,923       46,759         4,836

Fidelity InvestmentsPuritan Fund
(3)                  Sold 215 shares
                    (     1 Transaction)                   4,586                              3,787        4,586           799

Putnam Investments  Putnam Money
(3)                  Market Fund
                     Sold 41,241 shares
                     (   1 Transaction)                   41,241                             41,241       41,241

<FN>

(1)  Under  ERISA,  a  reportable  transaction  is a  transaction  or  series of
     transactions  during the Plan year that involves more than 5 percent of the
     fair  value of the Plan's net assets at the  beginning  of the Plan  year,
     with certain exceptions.

(2)  Sponsor  and  employer  and,  therefore  a  party-in-interest  for  which a
     statutory exemption exists.

(3)  Trustree  for the Plan  and,  therefore  a  party-in-interest  for  which a
     statutory exemption exists.
</FN>
</TABLE>
                                       13

<PAGE>




                               UNOCAL CORPORATION

                                  EXHIBIT INDEX





Exhibit 23         Consent of PricewaterhouseCoopers LLP






                                       14






                                                                      EXHIBIT 23






                                              CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the  incorporation by reference in the  Registration  Statement of
Unocal  Corporation  on Form S-8 (No.  33-65461)  of our report,  dated June 18,
1999, on our audits of the financial  statements and  supplemental  schedules of
the Molycorp,  Inc. 401(k)  Retirement  Savings Plan as of December 31, 1998 and
1997 and for the years then ended which report is included in this annual report
on Form 11-K.










PricewaterhouseCoopers LLP
Los Angeles, California
June 29, 1999





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