OCCIDENTAL PETROLEUM CORP /DE/
S-3/A, 1999-06-09
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1


      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 9, 1999



                                                      REGISTRATION NO. 333-79541

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------


                                 PRE-EFFECTIVE


                                AMENDMENT NO. 1


                                       TO


                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

<TABLE>
<S>                                                <C>                              <C>
        OCCIDENTAL PETROLEUM CORPORATION                      DELAWARE                     95-4035997
              OXY CAPITAL TRUST II                            DELAWARE                     95-7065347
              OXY CAPITAL TRUST III                           DELAWARE                     95-7065348
          (EXACT NAME OF REGISTRANT AS              (STATE OR OTHER JURISDICTION        (I.R.S. EMPLOYER
            SPECIFIED IN ITS CHARTER)                    OF INCORPORATION OR          IDENTIFICATION NO.)
                                                            ORGANIZATION)
</TABLE>

                            10889 WILSHIRE BOULEVARD
                         LOS ANGELES, CALIFORNIA 90024
                                 (310) 208-8800
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
     INCLUDING AREA CODE, OF EACH REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                            DONALD P. DE BRIER, ESQ.
       EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND CORPORATE SECRETARY
                        OCCIDENTAL PETROLEUM CORPORATION
                            10889 WILSHIRE BOULEVARD
                         LOS ANGELES, CALIFORNIA 90024
                                 (310) 208-8800
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to
time after this Registration Statement becomes effective.

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box.  [ ]

If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box.  [X]

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, please check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [X]

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


THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.


SUBJECT TO COMPLETION, DATED JUNE 9, 1999

PROSPECTUS

                                 $1,000,000,000
                                     (LOGO)
                        OCCIDENTAL PETROLEUM CORPORATION

                             Senior Debt Securities

                          Subordinated Debt Securities

                                Preferred Stock

                               Depositary Shares

                              OXY CAPITAL TRUST II
                             OXY CAPITAL TRUST III

       Preferred Securities Guaranteed To The Extent Set Forth Herein By
                        Occidental Petroleum Corporation
- --------------------------------------------------------------------------------

We will provide the specific terms of these securities in supplements to this
prospectus. You should read this prospectus and any supplement carefully before
you invest.
- --------------------------------------------------------------------------------

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS OR THE ACCOMPANYING PROSPECTUS SUPPLEMENT IS TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

   THIS PROSPECTUS MAY NOT BE USED TO SELL SECURITIES UNLESS ACCOMPANIED BY A
                             PROSPECTUS SUPPLEMENT.

             The date of this prospectus is                 , 1999.
<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Forward-Looking Statements..................................    2
About This Prospectus.......................................    3
Where You Can Find More Information.........................    4
Occidental..................................................    5
The Trusts..................................................    5
Use of Proceeds.............................................    6
Ratios of Earnings to Fixed Charges and Earnings to Combined
  Fixed Charges and
  Preferred Stock Dividends.................................    6
Description of Securities...................................    6
Description of Senior Debt Securities.......................    7
Description of Subordinated Debt Securities.................   16
Description of Preferred Stock..............................   24
Description of Depositary Shares............................   26
Description of Preferred Securities.........................   29
Description of Preferred Securities Guarantees..............   35
Relationship Among Preferred Securities, Preferred
  Securities Guarantees and Subordinated Debt Securities
  Held by Each Trust........................................   37
Plan of Distribution........................................   38
Legal Opinions..............................................   39
Experts.....................................................   39
</TABLE>


                           FORWARD-LOOKING STATEMENTS

This prospectus includes or incorporates by reference forward-looking
statements, including those identified by the words "estimates," "projects,"
"predicts," "believes," "expects" and similar expressions that convey the
uncertainty of future events or outcomes. These forward-looking statements are
subject to risks, uncertainties, and assumptions about Occidental that could
significantly affect expected results of operations, liquidity and cash flows,
including, among other things:

     - global commodity pricing fluctuations;

     - competitive pricing pressures;

     - higher than expected costs including feedstocks;

     - the supply and demand considerations for our products;

     - any general economic recession domestically or internationally; and

     - not successfully completing any development of new fields, expansion,
       capital expenditure, efficiency improvement, acquisition or divestiture.

We undertake no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information or otherwise. In light of
these risks, uncertainties and assumptions, the forward-looking events discussed
in this prospectus or in the incorporated documents might not occur.

                                        2
<PAGE>   4

You should rely only on the information contained or incorporated by reference
in this prospectus and any accompanying prospectus supplements. We have not
authorized any other person to provide you with different information. If anyone
provides you with different or inconsistent information, you should not rely on
it. We are not making an offer to sell these securities in any jurisdiction
where the offer or sale is not permitted. The information contained or
incorporated by reference in this prospectus is accurate only as of the date on
the front cover of this prospectus. Our business, financial condition, results
of operations and prospects may have changed since that date.

                             ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement Occidental and the trusts
filed with the Securities and Exchange Commission using a "shelf" registration
process. Under this shelf registration process, Occidental may sell any
combination of the senior debt securities, subordinated debt securities,
preferred stock and depositary shares and the trusts may sell preferred
securities as described in this prospectus in one or more offerings up to a
total dollar amount of $1,000,000,000 (or the equivalent thereof if any of the
securities are denominated in a currency, currency unit or composite currency
other than the U.S. dollar). This prospectus provides you with a general
description of the securities Occidental and the trusts may offer. Each time
Occidental or a trust sells securities, it will provide a prospectus supplement
and, for certain offerings, a pricing supplement, that will contain specific
information about the terms of that offering. The prospectus supplement may also
add, update or change information contained in this prospectus. You should read
this prospectus, any prospectus supplement and any pricing supplement together
with the additional information described under the heading "Where You Can Find
More Information."

                                        3
<PAGE>   5

WHERE YOU CAN FIND MORE INFORMATION

Occidental files annual, quarterly and special reports, proxy statements, and
other information with the SEC. You may read and copy any document we file at
the SEC's public reference rooms at 450 Fifth Street, N.W., Washington, D.C.
20549 and in New York, New York and Chicago, Illinois. Please call the SEC at
1-800-SEC-0330 for further information on the public reference rooms. The SEC
also maintains an internet site at http://www.sec.gov that contains reports,
proxy and information statements and other information regarding issuers that
file electronically with the SEC, including Occidental. Occidental's common
stock is listed and traded on the New York Stock Exchange ("NYSE"). These
reports, proxy statements and other information are also available for
inspection at the offices of the NYSE, 20 Broad Street, New York, New York
10005.

This prospectus is part of a registration statement filed with the SEC by
Occidental and the trusts. You may obtain the full registration statement from
the SEC as indicated above or from Occidental.

The SEC allows Occidental to "incorporate by reference" the information it files
with the SEC. This permits Occidental to disclose important information to you
by referencing these filed documents. Any information referenced this way is
considered part of this prospectus, and any information filed with the SEC
subsequent to this prospectus will automatically be deemed to update and
supersede this information. Occidental incorporates by reference the following
documents which have been filed with the SEC:

- - Annual Report on Form 10-K for the year ended December 31, 1998;

- - Quarterly Report on Form 10-Q for the quarter ended March 31, 1999;

- - Current Reports on Form 8-K, dated January 6, 1999, January 13, 1999, January
  20, 1999 (Form 8-K/A), January 26, 1999, February 5, 1999 and April 20, 1999;
  and

- - Description of Occidental's $3.00 Cumulative CXY-Indexed Convertible Preferred
  Stock included in Amendment No. 5 to Registration Statement on Form 8-B/A
  filed with the SEC on November 2, 1995.

Occidental also incorporates by reference any future filings made by Occidental
with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
of 1934 (the "Exchange Act") until our offering of securities has been
completed.

Occidental will provide without charge upon written or oral request, a copy of
any or all of the documents which are incorporated by reference to this
prospectus. Requests should be directed to Occidental Petroleum Corporation,
10889 Wilshire Boulevard, Los Angeles, California 90024, Attn: J. R. Havert,
Vice President and Treasurer; telephone: (310) 208-8800.

There are no separate financial statements of the trusts in this prospectus.
Occidental does not believe such financial statements would be helpful because:

- - The trusts are direct or indirect wholly-owned subsidiaries of Occidental,
  which files consolidated financial information under the Exchange Act.

- - The trusts do not have any independent operations other than issuing the
  preferred and common securities and purchasing the subordinated debt
  securities.

- - Occidental guarantees the preferred securities of the trusts as described in
  this prospectus.
                                        4
<PAGE>   6

OCCIDENTAL

Occidental explores for, develops, produces and markets crude oil and natural
gas and manufactures and markets a variety of basic chemicals, including
chlorine, caustic soda and ethylene dichloride (EDC), as well as specialty
chemicals. Occidental conducts its principal operations through two
subsidiaries, Occidental Oil and Gas Corporation and Occidental Chemical
Corporation. Occidental has an interest in the vinyls intermediates business,
including polyvinyl chloride (PVC) and vinyl chloride monomer (VCM), through its
76 percent interest in the Oxy Vinyls, LP partnership. Occidental also has an
interest in the petrochemicals business through its 29.5 percent interest in the
Equistar Chemicals, LP partnership. Occidental's executive offices are located
at 10889 Wilshire Boulevard, Los Angeles, California 90024; telephone (310)
208-8800.

THE TRUSTS

Occidental created two Delaware business trusts pursuant to two Declarations of
Trust. The trusts are named Oxy Capital Trust II and Oxy Capital Trust III. As
used in this prospectus, the words "trust" or "trusts" refer to Oxy Capital
Trust II and Oxy Capital Trust III. Occidental will file an Amended and Restated
Declaration of Trust (a "Declaration") for each trust, which will state the
terms and conditions for each trust to issue and sell its preferred securities
and common securities. A form of Declaration is incorporated by reference as an
exhibit to the registration statement of which this prospectus forms a part.

Each trust will exist solely to:

- - issue and sell its preferred and common securities;

- - use the proceeds from the sale of its preferred and common securities to
  purchase a series of Occidental's subordinated debt securities;

- - maintain its status as a grantor trust for United States federal income tax
  purposes; and

- - engage in other activities that are necessary or incidental to these purposes.

Occidental will purchase all of the common securities of each trust. The common
securities will represent an aggregate liquidation amount equal to at least 3
percent of each trust's total capitalization. The preferred securities will
represent the remaining 97 percent of each trust's total capitalization. The
common securities will have terms substantially identical to, and will rank
equal in priority of payment with, the preferred securities. However, if
Occidental defaults on the related subordinated debt securities, then cash
distributions and liquidation, redemption and other amounts payable on the
common securities will be subordinate to the preferred securities in priority of
payment.

Occidental will guarantee the preferred securities as described later in this
prospectus.

Occidental has appointed five trustees to conduct each trust's business and
affairs:

- - The Bank of New York ("Property Trustee");

- - The Bank of New York (Delaware) ("Delaware Trustee"); and

- - Three Occidental officers ("Regular Trustees").

Only Occidental, as owner of the common securities, can remove or replace the
trustees. In addition, Occidental can increase or decrease the number of
trustees. However, the majority of trustees will always be Regular Trustees.

Occidental will pay all fees and expenses related to each trust and each
offering of the related preferred securities and will pay all

                                        5
<PAGE>   7

ongoing costs and expenses of each trust, except that trust's obligations under
the related preferred and common securities.

The trusts will not have separate financial statements. The statements would not
be material to holders of the preferred securities because no trust will have
any independent operations. Each trust exists solely for the reasons summarized
above.

USE OF PROCEEDS

The net proceeds Occidental receives from the sale of securities offered under
this prospectus will be used for general corporate purposes, including the
retirement of outstanding debt. Each trust will use all proceeds from the sale
of the common and preferred securities to purchase subordinated debt securities
of Occidental. The prospectus supplement with respect to any offering of
securities may identify different or additional uses for the proceeds of such
offering.

RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO COMBINED FIXED CHARGES AND
PREFERRED STOCK DIVIDENDS

The following table sets forth Occidental's total enterprise ratios of earnings
to fixed charges and earnings to combined fixed charges and preferred stock
dividends based on the historical results of Occidental and its subsidiaries.
For the purpose of calculating these ratios, earnings consist of income from
continuing operations before income taxes (other than foreign oil and gas taxes)
and fixed charges. Fixed charges include interest and debt expense, including
the proportionate share of interest and debt expense of 50-percent-owned equity
investments and the portion of lease rentals representative of the interest
factor.

<TABLE>
<CAPTION>
                            THREE
                           MONTHS
                            ENDED
                          MARCH 31,        YEARS ENDED DECEMBER 31,
                         -----------   --------------------------------
                         1999   1998   1998   1997   1996   1995   1994
                         ----   ----   ----   ----   ----   ----   ----
<S>                      <C>    <C>    <C>    <C>    <C>    <C>    <C>
Ratio of Earnings to
  Fixed Charges........  (a)    2.45   1.93   1.55   2.08   1.75   (b)
Ratio of Earnings to
  Combined Fixed
  Charges and Preferred
  Stock Dividends......  (c)    2.34   1.85   1.28   1.53   1.45   (d)
</TABLE>

(a) Earnings were inadequate to cover fixed charges by $23 million for the three
    months ended March 31, 1999.

(b) Earnings were inadequate to cover fixed charges by $298 million in 1994.

(c) Earnings were inadequate to cover combined fixed charges and preferred stock
    dividends by $28 million for the three months ended March 31, 1999.

(d) Earnings were inadequate to cover combined fixed charges and preferred stock
    dividends by $395 million in 1994.

DESCRIPTION OF SECURITIES

This prospectus contains a summary of the senior debt securities, the
subordinated debt securities, the preferred stock, the depositary shares, the
preferred securities and the preferred securities guarantee. These summaries are
not meant to be a complete description of each security. However, this
prospectus, the accompanying prospectus supplement and the accompanying pricing
supplement, if applicable, contain the material terms and conditions for each
security. For more information please refer to (1) the indenture (the "Senior
Indenture") between Occidental and The Bank of New York, as trustee ("Senior
Indenture Trustee"), relating to issuance of each series of senior debt
securities, (2) the indenture (the "Subordinated Indenture") between Occidental
and The Bank of New York, as trustee (the "Subordinated Indenture Trustee")
relating to issuance of each series of subordinated debt securities, (3) the
certificate of designations relating to each series of preferred stock, (4) the
deposit agreement and the depositary receipts relating to offerings of
depositary shares, (5) the Declaration of each trust and (6) Occiden-

                                        6
<PAGE>   8

tal's guarantee of the preferred securities issued by each trust (the "Preferred
Securities Guarantees"). Forms of these documents are filed with or incorporated
by reference as exhibits to the registration statement (or in the case of an
offering of preferred stock, will be filed as exhibits to the registration
statement), which includes this prospectus. Capitalized terms used in this
prospectus that are not defined will have the meanings given them in these
documents.

DESCRIPTION OF SENIOR DEBT SECURITIES

GENERAL

Below is a description of certain general terms of the senior debt securities.
The description is not complete and is subject to and qualified in its entirety
by reference to the Senior Indenture. The particular terms of a series of senior
debt securities will be described in a prospectus supplement and, if applicable,
a pricing supplement.

The senior debt securities will rank equally with all of Occidental's senior and
unsubordinated debt. The Senior Indenture does not limit the amount of senior
debt securities which Occidental may issue, nor does it limit Occidental or its
subsidiaries from issuing any other unsecured debt.

Occidental will issue the senior debt securities under the Senior Indenture. The
Senior Indenture will be qualified under the Trust Indenture Act of 1939, as
amended (the "Trust Indenture Act"). The Senior Indenture is filed as an exhibit
to the registration statement which includes this prospectus.

Each prospectus supplement, together with a pricing supplement, if applicable,
will describe the following terms relating to a series of senior debt
securities, as follows:

- - the title;

- - any limit on the amount that may be issued;

- - whether or not that series of senior debt securities will be issued as
  registered securities, bearer securities or both;

- - the price at which that series of senior debt securities will be issued, which
  may be at a discount;

- - whether or not that series of senior debt securities will be issued in global
  form, the terms and who the depositary will be;

- - the maturity date(s);

- - the person to whom any interest will be payable on any registered security, if
  other than the person in whose name that security is registered at the close
  of business on the regular record date;

- - the annual interest rate(s), if any, (which may be fixed or variable) or the
  method for determining the rate(s) and the date(s) interest will begin to
  accrue, the date(s) interest will be payable and the regular record date(s)
  for interest payment date(s) or the method for determining such date(s);

- - the place(s) where payments shall be payable, registered securities may be
  surrendered for registration of transfer, securities may be surrendered for
  exchange, and notices and demands to or upon Occidental may be served;

- - the period(s) within which, and the price(s) at which, that series of senior
  debt securities may, pursuant to any optional or mandatory redemption
  provisions, be redeemed, in whole or in part, and other related terms and
  provisions;

- - any mandatory or optional sinking fund provisions or any provisions for
  remarketing that series of senior debt securities and other related terms and
  provisions;

- - the denominations in which that series of senior debt securities will be
  issued, if other than denominations of $1,000 in the case of registered
  securities and any integral multi-

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<PAGE>   9

  ple thereof, and in the case of bearer securities, if other than denominations
  of $5,000 and $100,000;

- - the currency or currencies, including composite currencies or currency units,
  in which that series of senior debt securities may be denominated or in which
  payment of the principal of and interest, if any, on that series of senior
  debt securities shall be payable, if other than the currency of the United
  States of America, and, if so, whether that series of senior debt securities
  may be satisfied and discharged other than as provided in Article Four of the
  Senior Indenture;

- - if the amounts of payments of principal of and interest, if any, on that
  series of senior debt securities are to be determined with reference to an
  index, formula or other method, or based on a coin or currency other than that
  in which that series of senior debt securities are stated to be payable, the
  manner in which such amounts shall be determined and the calculation agent, if
  any, with respect thereto;

- - if other than the principal amount thereof, the portion of the principal
  amount of that series of senior debt securities that will be payable upon
  declaration of acceleration of the maturity thereof pursuant to an event of
  default;

- - if other than as defined in the Senior Indenture, the meaning of "Business
  Day" when used with respect to that series of senior debt securities;

- - if that series of senior debt securities may be issued or delivered (whether
  upon original issuance or upon exchange of a temporary security of such series
  or otherwise), or any installment of principal or interest is payable, only
  upon receipt of certain certificates or other documents or satisfaction of
  other conditions in addition to those specified in the Senior Indenture, the
  forms and terms of those certificates, documents or conditions;

- - any addition to, or modification or deletion of, any event of default,
  covenant of Occidental or other term or provision specified in the Senior
  Indenture with respect to that series of senior debt securities; and

- - any other terms (which terms may be inconsistent with the Senior Indenture).

CONSOLIDATION, MERGER OR SALE

The Senior Indenture generally permits Occidental to merge or consolidate, or
sell, convey, transfer or otherwise dispose of its assets as an entirety or
substantially as an entirety, provided that no event of default would occur as a
result of that transaction. However, any successor or acquiror of such assets
must assume all of the obligations of Occidental under the Senior Indenture and
the senior debt securities and be organized and existing under U.S. laws.

LIMITATION ON LIENS

Occidental will not, nor will it permit any Consolidated Subsidiary (as defined
below), to incur, create, assume, guarantee or otherwise become liable with
respect to any Secured Debt (as defined below), unless the Securities are
secured equally and ratably with (or prior to) such Secured Debt. This covenant
will not apply to:

(1) Liens (as defined below) existing on the date of the Senior Indenture;

(2) Liens existing on property of, or on any shares of stock or Indebtedness of,
any corporation at the time such corporation becomes a Consolidated Subsidiary;

(3) Liens in favor of Occidental or a Consolidated Subsidiary;

(4) Liens in favor of governmental bodies to secure progress, advance or other
payments;

                                        8
<PAGE>   10

(5) Liens existing on property, shares of stock or Indebtedness at the time of
acquisition thereof (including acquisition through merger or consolidation) or
Liens to secure the payment of all or any part of the purchase price thereof or
the cost of construction, installation, renovation, improvement or development
thereon or thereof or to secure any Indebtedness incurred prior to, at the time
of, or within 360 days after the later of the acquisition, completion of such
construction, installation, renovation, improvement or development or the
commencement of full operation of such property or within 360 days after the
acquisition of such shares or Indebtedness for the purpose of financing all or
any part of the purchase price or cost thereof; and

(6) any extension, renewal or refunding of any Liens referred to in the
foregoing clauses (1) through (5).

Notwithstanding the foregoing, Occidental and one or more Consolidated
Subsidiaries may incur, create, assume, guarantee or otherwise become liable
with respect to Secured Debt that would otherwise be subject to the foregoing
restrictions if, after giving effect thereto, the aggregate amount of all
Secured Debt, together with the Discounted Rental Value (as defined below) in
respect of sale and leaseback transactions subject to the restrictions discussed
in the following paragraph (excluding sale and leaseback transactions exempted
from such restrictions pursuant to clause (1) or (2) of the last sentence of
such paragraph), would not exceed 10 percent of consolidated Net Tangible Assets
(as defined below) of Occidental and its Consolidated Subsidiaries.

LIMITATIONS ON SALE AND LEASEBACK TRANSACTIONS

Occidental will not nor will it permit any Consolidated Subsidiary to sell and
lease back any Principal Domestic Property (as defined below) unless:

(1) the sale has occurred within 360 days after the later of the acquisition,
completion of construction or commencement of full operations of the Principal
Domestic Property;

(2) Occidental or such Consolidated Subsidiary could subject such Principal
Domestic Property to a Lien pursuant to the provisions described above under
"Limitation on Liens" in an amount equal to the Discounted Rental Value with
respect to the sale and leaseback transaction without equally and ratably
securing the Securities; or

(3) Occidental or such Consolidated Subsidiary, within 120 days after such sale,
applies or causes to be applied to the retirement of its Funded Debt (as defined
below) an amount (subject to credits for certain voluntary retirements of Funded
Debt) not less than the greater of (a) the net proceeds of the sale of the
Principal Domestic Property leased pursuant to such arrangement or (b) the fair
value (as determined in any manner approved by the Board of Directors of
Occidental) of the Principal Domestic Property so leased.

This restriction will not apply to any sale and leaseback transaction (1)
between Occidental and a Consolidated Subsidiary or between Consolidated
Subsidiaries or (2) involving the taking back of a lease for a period, including
renewals, of not more than three years.

CERTAIN DEFINITIONS

"Consolidated Subsidiary" means any Subsidiary included in the financial
statements of Occidental and its Subsidiaries prepared on a consolidated basis
in accordance with generally accepted accounting principles.

"Discounted Rental Value" means, as to any particular lease under which any
Person is at

                                        9
<PAGE>   11

the time liable and at any date as of which the amount thereof is to be
determined, the total net amount of rent (after deducting the amount of rent to
be received by such Person under noncancelable subleases) required to be paid by
such Person under such lease during the remaining noncancelable term thereof
(including any such period for which such lease has been extended or may, at the
option of the lessor, be extended), discounted from the respective due dates
thereof to such date at a rate per annum of 11 3/4 percent. The net amount of
rent required to be paid under any such lease for any such period shall be the
aggregate amount of the rent payable by the lessee with respect to such period,
after excluding amounts required to be paid on account of maintenance and
repairs, insurance, taxes, water rates and similar charges. In the case of any
lease which is terminable by the lessee upon the payment of a penalty, such net
amount shall also include the amount of such penalty, but no rent shall be
considered as required to be paid under such lease subsequent to the first date
upon which it may be so terminated. If and to the extent the amount of any rent
during any future period is not definitely determinable under the lease in
question, the amount of such rent shall be estimated in such reasonable manner
as the Board of Directors of Occidental may in good faith determine.

"Funded Debt" means all Indebtedness maturing one year or more from the date of
the creation thereof, all Indebtedness directly or indirectly renewable or
extendible, at the option of the debtor, by its terms or by the terms of any
instrument or agreement relating thereto, to a date one year or more from the
date of the creation thereof, and all Indebtedness under a revolving credit or
similar agreement obligating the lender or lenders to extend credit over a
period of one year or more, even though such Indebtedness may also conform to
the definition of Short-Term Borrowing.

"Lien" means and includes any mortgage, pledge, lien, security interest,
conditional sale or other title retention agreement or other similar encumbrance
to secure Indebtedness for borrowed money but excluding any security interest
which a lessor may be deemed to have under a lease and any lien which may be
deemed to exist under a Production Payment or under any subordination
arrangement.

"Net Tangible Assets" of any specified Person means the total of all assets
properly appearing on a balance sheet of such Person prepared in accordance with
generally accepted accounting principles, after deducting from such total,
without duplication of deductions, (1) all Current Liabilities of such Person;
(2) that portion of the book amount of all such assets which would be treated as
intangibles under generally accepted accounting principles, including, without
limitation, all such items as goodwill, trademarks, trade names, brands,
copyrights, patents, licenses and rights with respect to the foregoing and
unamortized debt discount and expense; and (3) the amount, if any, at which any
stock of such Person appears on the asset side of such balance sheet.

"Principal Domestic Property" means any (1) developed oil or gas producing
property or (2) processing or manufacturing plant, in each case which as of the
date of the Indenture is or thereafter is owned or leased by Occidental or any
Consolidated Subsidiary and which is located in the continental United States
(provided, however, that any such property or plant declared by the Board of
Directors by Board Resolution not to be of material importance to the business
of Occidental and its Consolidated Subsidiaries taken as a whole will be
excluded from the foregoing definition).

                                       10
<PAGE>   12

"Production Payment" means any economic interest in oil, gas or mineral reserves
which (1) entitles the holder thereof to a specified share of future production
from such reserves, free of the costs and expenses of such production, and (2)
terminates when a specified quantity of such share of future production from
such reserves has been delivered or a specified sum has been realized from the
sale of such share of future production from such reserves.

"Secured Debt" means any Indebtedness of Occidental or any Consolidated
Subsidiary, secured by a Lien on any Principal Domestic Property or on any
shares of stock or on any Indebtedness of any Consolidated Subsidiary which owns
any Principal Domestic Property.

EVENTS OF DEFAULT UNDER THE SENIOR INDENTURE

The following are events of default under the Senior Indenture with respect to
any series of senior debt securities issued:

- - failure to pay interest when due and such failure continues for 30 days and
  the time for payment has not been extended or deferred;

- - failure to pay the principal (or premium, if any) when due;

- - failure to observe or perform any other covenant contained in the senior debt
  securities or the Senior Indenture (other than a covenant specifically
  benefitting only another series of senior debt securities), and such failure
  continues for 60 days after Occidental receives notice from the Senior
  Indenture Trustee or holders of at least 25 percent in aggregate principal
  amount of the outstanding senior debt securities of that series;

- - acceleration of more than $50,000,000 of debt of Occidental, after which the
  accelerated debt is not discharged or the acceleration is not cancelled within
  20 days after Occidental receives notice from the Senior Indenture Trustee or
  holders of at least 25 percent in aggregate principal amount of the
  outstanding senior debt securities of that series;

- - certain events of bankruptcy, insolvency or reorganization of Occidental; and

- - any other event of default specified in the prospectus supplement or pricing
  supplement, if any, relating to that series of senior debt securities.

If an event of default with respect to senior debt securities of any series
occurs and is continuing, the Senior Indenture Trustee or the holders of at
least 25 percent in principal amount of the outstanding senior debt securities
of that series, by notice in writing to Occidental (and to the Senior Indenture
Trustee if notice is given by such holders), may declare the principal of (or if
such senior debt securities are discount securities, the portion of the
principal amount as specified in the applicable prospectus supplement or pricing
supplement, if any), premium, if any, and accrued interest, if any, due and
payable immediately.

The holders of a majority in aggregate principal amount of the outstanding
senior debt securities of an affected series may waive any past default or event
of default with respect to that series and its consequences, except defaults or
events of default regarding:

- - payment of principal or interest; or

- - covenants that cannot be modified or amended without the consent of each
  holder of any outstanding senior debt securities affected (as described under
  "-- Modification of Senior Indenture; Waiver" below).

Any waiver shall cure the corresponding default or event of default.

                                       11
<PAGE>   13

Subject to the terms of the Senior Indenture, if an event of default under the
Senior Indenture shall occur and be continuing, the Senior Indenture Trustee
will be under no obligation to exercise any of its rights or powers under the
Senior Indenture at the request or direction of any of the holders of the
applicable series of senior debt securities, unless the holders have offered the
Senior Indenture Trustee reasonable security or indemnity. The holders of a
majority in principal amount of the outstanding senior debt securities of any
series will have the right to direct the time, method and place of conducting
any proceeding for any remedy available to the Senior Indenture Trustee, or
exercising any trust or power conferred on the Senior Indenture Trustee, with
respect to the senior debt securities of that series, provided that:

- - the direction given to the Senior Indenture Trustee is not in conflict with
  any law or the Senior Indenture;

- - the Senior Indenture Trustee may take any other action deemed proper by it
  which is not inconsistent with that direction; and

- - the Senior Indenture Trustee has not determined that the action would be
  unjustly prejudicial to the holders not involved in the proceeding.

A holder of the senior debt securities of any series will have the right to
institute a proceeding under the Senior Indenture or to appoint a receiver or
trustee, or to seek other remedies only if:

- - the holder has given written notice to the Senior Indenture Trustee of a
  continuing event of default with respect to that series;

- - the holders of at least 25 percent in aggregate principal amount of the
  outstanding senior debt securities of that series have made written request
  to, and have offered reasonable indemnity to, the Senior Indenture Trustee to
  institute the proceedings as trustee; and

- - the Senior Indenture Trustee does not institute the proceeding, and does not
  receive from the holders of a majority in aggregate principal amount of the
  outstanding senior debt securities of that series other conflicting
  directions, within 60 days after the notice, request and offer.

These limitations do not apply to a suit instituted by a holder of senior debt
securities if Occidental defaults in the payment of the principal, premium, if
any, or interest on, the senior debt securities.

Occidental will periodically file statements with the Senior Indenture Trustee
regarding its compliance with the conditions and covenants in the Senior
Indenture.

MODIFICATION OF SENIOR INDENTURE; WAIVER

Occidental and the Senior Indenture Trustee may change the Senior Indenture
without the consent of any holders with respect to certain matters, including:

- - evidencing the succession of another person to Occidental and the assumption
  by it of the covenants of Occidental in the Senior Indenture and the
  corresponding series of securities;

- - adding to the covenants, agreements and obligations of Occidental for the
  benefit of the holders of that series of senior debt securities, or to
  surrender any right or power the Senior Indenture confers upon Occidental;

- - evidencing and providing for the acceptance of appointment under the Senior
  Indenture of a successor Senior Indenture Trustee with respect to the
  securities of one or more series and to add to or change any provisions of the
  Senior Indenture as shall be necessary to provide for or facilitate the

                                       12
<PAGE>   14

  administration of the trusts by more than one Senior Indenture Trustee;

- - curing any ambiguity or correcting any inconsistency in the Senior Indenture
  or making other provisions with respect to matters or questions arising under
  the Senior Indenture;

- - adding, changing or eliminating any provisions of the Senior Indenture (which
  addition, change or elimination may apply to one or more series of senior debt
  securities), provided that the addition, change or elimination neither (a)
  applies to any security of any series created prior to the execution of the
  supplemental indenture that is entitled to the benefit of the provision nor
  (b) modifies the rights of holders of the securities with respect to the
  modified provisions;

- - securing the securities; or

- - changing anything else that does not adversely affect the interests of any
  holder of senior debt securities.

In addition, under the Senior Indenture, the rights of holders of a series of
senior debt securities may be changed by Occidental and the Senior Indenture
Trustee with the written consent of the holders of at least a majority in
aggregate principal amount of the outstanding senior debt securities of each
series that is affected. However, the following changes, among other things, may
be made only with the consent of each holder of any outstanding senior debt
securities affected:

- - changing the stated maturity of such senior debt securities;

- - reducing the principal amount of a discount security payable upon declaration
  of acceleration;

- - reducing the principal amount, reducing the rate of or extending the time of
  payment of interest, or reducing any premium payable upon the redemption of
  any of the senior debt securities;

- - changing the place or currency of payment of principal or interest, if any, on
  any of the senior debt securities;

- - impairing the right to institute suit for the enforcement of any payment on or
  with respect to any of the senior debt securities; and

- - modifying any of the foregoing requirements or reducing the percentage of
  senior debt securities, the holders of which are required to consent to any
  amendment or waiver of any covenant or past default.

FORM, EXCHANGE, AND TRANSFER

The senior debt securities of each series may be issued as registered
securities, as bearer securities (with or without coupons) or both. Unless
otherwise specified in the applicable prospectus supplement or the pricing
supplement, if any, registered securities will be issued in denominations of
$1,000 and any integral multiple thereof and bearer securities will be issued in
denominations of $5,000 and $100,000. Subject to the terms of the Senior
Indenture and the limitations applicable to global securities described in the
applicable prospectus supplement or the pricing supplement, if any, registered
securities will be exchangeable for other registered securities of the same
series, in any authorized denomination and of like tenor and aggregate principal
amount.

Subject to the terms of the Senior Indenture and the limitations applicable to
global securities set forth in the applicable prospectus supplement or pricing
supplement, if any, senior debt securities issued as registered securities may
be presented for exchange or for registration of transfer (duly endorsed or with
the form of transfer duly executed) at the office of the Security Registrar or
at the office of any transfer agent designated by

                                       13
<PAGE>   15

Occidental for that purpose. Bearer securities will not be issued in exchange
for registered securities. Unless otherwise provided in the senior debt
securities to be transferred or exchanged, no service charge will be made for
any registration of transfer or exchange, but Occidental may require payment of
any taxes or other governmental charges. Occidental has appointed the Senior
Indenture Trustee as Security Registrar. Any transfer agent (in addition to the
Security Registrar) initially designated by Occidental for any senior debt
securities will be named in the applicable prospectus supplement. Occidental may
at any time designate additional transfer agents or rescind the designation of
any transfer agent or approve a change in the office through which any transfer
agent acts, except that Occidental will be required to maintain a transfer agent
in each place of payment for the senior debt securities of each series.

If the senior debt securities of any series are to be redeemed, Occidental will
not be required to:

- - issue, register the transfer of, or exchange any senior debt securities of,
  that series during a period beginning at the opening of business 15 days
  before any selection of senior debt securities for redemption and ending, in
  the case of registered securities, at the close of business on the day of
  mailing of the relevant notice of redemption and, in the case of bearer
  securities, the first publication date of the notice, or if the senior debt
  securities of that series are also issuable as registered securities and there
  is no publication, at the close of business on the day of mailing of the
  notice;

- - in the case of registered securities, register the transfer of or exchange any
  senior debt securities so selected for redemption, in whole or in part, except
  the unredeemed portion of any registered security being redeemed in part; or

- - in the case of bearer securities, exchange any senior debt securities so
  selected for redemption, except to exchange a bearer security for a registered
  security that is immediately surrendered for redemption.

GLOBAL SECURITIES

The senior debt securities of each series may be issued in whole or in part in
global form. A senior debt security in global form will be deposited with, or on
behalf of, a depositary, which will be named in an applicable prospectus
supplement or pricing supplement, if any. A global security may be issued in
either registered or bearer form and in either temporary or definitive form. A
global senior debt security may not be transferred, except as a whole, among the
depositary for that senior debt security and/or its nominees and/or successors.
If any senior debt securities of a series are issuable as global securities, the
applicable prospectus supplement or pricing supplement, if any, will describe
any circumstances when beneficial owners of interest in that global security may
exchange their interests for definitive senior debt securities of like series
and tenor and principal amount in any authorized form and denomination, the
manner of payment of principal of and interest, if any, on that global senior
debt security and the specific terms of the depositary arrangement with respect
to that global senior debt security.

DISCHARGE

Unless otherwise indicated in an applicable prospectus supplement or pricing
supplement, if any, Occidental may terminate at any time its obligations under
the Senior Indenture with respect to any series of senior debt securities by
(1)(a) delivering all of the outstanding securities of that series to the Senior
Indenture Trustee to be cancelled or

                                       14
<PAGE>   16

(b) depositing with the Senior Indenture Trustee funds or non-callable United
States government obligations sufficient to pay all remaining principal and
interest on the series of senior debt securities and (2) complying with selected
other provisions of the Senior Indenture.

If Occidental elects to satisfy its obligations by depositing United States
obligations as described above ("discharge"), that election under present law is
likely to be treated as a redemption of the senior debt securities of that
series prior to maturity in exchange for the property deposited in trust. If so,
each holder would generally recognize, at the time of discharge, gain or loss
for United States federal income tax purposes measured by the difference between
(1) the sum of (a) the amount of any cash and (b) the fair market value of any
property deposited in trust deemed received by the holder (unless attributable
to accrued interest) and (2) the holder's tax basis in the senior debt
securities deemed surrendered. After the discharge, each holder would be treated
as if it held an undivided interest in the cash (or investments made therewith)
and the property held in trust. Each holder would generally be subject to tax
liability in respect of interest income and original issue discount, if
applicable, thereon and would recognize any gain or loss upon any disposition,
including redemption, of the assets held in trust. Although tax might be owed,
the holder of a discharged senior debt security would not receive cash (except
for current payments of interest on that senior debt security) until the
maturity or earlier redemption of that senior debt security. United States
federal income tax treatment of this nature could affect the purchase price that
a holder would receive upon the sale of the senior debt securities.

INFORMATION CONCERNING THE SENIOR INDENTURE TRUSTEE

The Senior Indenture Trustee, other than during the occurrence and continuance
of an event of default under the Senior Indenture, undertakes to perform only
those duties as are specifically set forth in the Senior Indenture and, upon an
event of default under the Senior Indenture, must use the same degree of care as
a prudent person would exercise or use in the conduct of his or her own affairs.
Subject to this provision, the Senior Indenture Trustee is under no obligation
to exercise any of the powers given it by the Senior Indenture at the request of
any holder of senior debt securities unless it is offered reasonable security
and indemnity by that holder against the costs, expenses and liabilities that it
might incur. The Senior Indenture Trustee is not required to spend or risk its
own money or otherwise become financially liable while performing its duties
unless it reasonably believes that it will be repaid or receive adequate
indemnity.

The Bank of New York is a participating lender under one of Occidental's
revolving credit agreements, provides commercial banking services to Occidental
and its affiliates and acts as the property trustee, preferred securities
guarantee trustee and (through an affiliate) Delaware trustee with respect to an
issue of trust preferred securities issued by an affiliate of Occidental. The
Bank of New York is the Senior Indenture Trustee and will also act as the
Subordinated Indenture Trustee, the Property Trustee and the Preferred
Securities Guarantee Trustee. In addition, an affiliate of The Bank of New York
will act as the Delaware Trustee under each trust. However, if The Bank of New
York acquires any conflicting interest when an event of default is pending, it
must (with certain exceptions) eliminate the conflict or resign.

                                       15
<PAGE>   17

PAYMENT AND PAYMENT AGENTS

Unless otherwise indicated in the applicable prospectus supplement or pricing
supplement, if any, payment of the interest on any senior debt securities (other
than bearer securities) on any interest payment date will be made to the person
in whose name those debt securities (or one or more predecessor securities) are
registered at the close of business on the regular record date for the interest.

Principal of and any premium and interest on the senior debt securities (other
than bearer securities) of a particular series will be payable at the office of
the paying agents that Occidental designates, except that, unless otherwise
indicated in the applicable prospectus supplement or pricing supplement, if any,
interest payments may be made by wire transfer or by check mailed to the holder.
Unless otherwise indicated in the applicable prospectus supplement or pricing
supplement, if any, the corporate trust office of the Senior Indenture Trustee
in The City of New York will be designated as sole paying agent for payments
with respect to senior debt securities of each series. Any other paying agents
initially designated by Occidental for the senior debt securities of a
particular series will be named in the applicable prospectus supplement or
pricing supplement, if any. Occidental will be required to maintain a paying
agent in each place of payment for the senior debt securities of a particular
series.

Unless otherwise indicated in an applicable prospectus supplement or pricing
supplement, if any, interest shall be computed on the basis of a 360-day year
comprised of twelve 30-day months.

Unless otherwise indicated in an applicable prospectus supplement or pricing
supplement, if any, payment of principal of and interest, if any, on bearer
securities will be made, subject to any applicable laws and regulations, at the
offices of a paying agent outside the United States as Occidental may designate,
or by check mailed to any address or by transfer to an account maintained by the
payee outside the United States. Unless otherwise indicated in an applicable
prospectus supplement or pricing supplement, if any, any payment of an
installment of interest on any bearer security will be made only if the coupon
relating to the interest installment is surrendered.

All moneys that Occidental pays to a paying agent or the Senior Indenture
Trustee for the payment of the principal of or any premium or interest on any
senior debt security which remain unclaimed at the end of two years after that
principal, premium or interest has become due and payable will be repaid to
Occidental, and the holder of the security thereafter may look only to
Occidental for payment thereof.

GOVERNING LAW

The Senior Indenture and senior debt securities will be governed by and
construed in accordance with the laws of the State of New York, except to the
extent that the Trust Indenture Act shall be applicable.

DESCRIPTION OF SUBORDINATED DEBT SECURITIES

GENERAL

Occidental may sell one or more series of subordinated debt securities pursuant
to this prospectus, including one series to each trust.

Below is a description of certain general terms of the subordinated debt
securities. The description is not complete and is subject to and qualified in
its entirety by reference to the Subordinated Indenture. The particular terms of
a series of subordinated debt securities will be described in a prospectus
supplement and, if applicable, a pricing supplement.

Each series of subordinated debt securities will be unsecured and will be
subordinate and junior in priority of payment to certain of
                                       16
<PAGE>   18

Occidental's other indebtedness to the extent described in a prospectus
supplement. The Subordinated Indenture does not limit the amount of subordinated
debt securities which Occidental may issue, nor does it limit Occidental or its
subsidiaries from issuing any other secured or unsecured debt.

Occidental will issue the subordinated debt securities under the Subordinated
Indenture. The Subordinated Indenture will be qualified under the Trust
Indenture Act. The form of Subordinated Indenture is filed as an exhibit to the
registration statement which includes this prospectus.

Each prospectus supplement, together with a pricing supplement, if applicable,
will describe the following terms relating to a series of subordinated debt
securities, as follows:

- - the title;

- - any limit on the amount that may be issued;

- - whether or not that series of subordinated debt securities will be issued as
  registered securities, bearer securities or both;

- - the price at which that series of subordinated debt securities will be issued,
  which may be at a discount;

- - whether or not that series of subordinated debt securities will be issued in
  global form, the terms and who the depositary will be;

- - the maturity date(s);

- - the person to whom any interest will be payable on any registered security, if
  other than the person in whose name that security is registered at the close
  of business on the regular record date;

- - the annual interest rate(s), if any, (which may be fixed or variable) or the
  method for determining the rate(s) and the date(s) interest will begin to
  accrue, the date(s) interest will be payable and the regular record date(s)
  for interest payment date(s) or the method for determining such date(s);

- - the place(s) where payments shall be payable, registered securities may be
  surrendered for registration of transfer, securities may be surrendered for
  exchange, and notices and demands to or upon Occidental may be served;

- - the period(s) within which, and the price(s) at which, that series of
  subordinated debt securities may, pursuant to any optional or mandatory
  redemption provisions, be redeemed, in whole or in part, and other related
  terms and provisions;

- - any mandatory or optional sinking fund provisions or any provisions for
  remarketing that series of subordinated debt securities and other related
  terms and provisions;

- - the denominations in which that series of subordinated debt securities will be
  issued, if other than denominations of $1,000 in the case of registered
  securities and any integral multiple thereof, and in the case of bearer
  securities, if other than denominations of $5,000 and $100,000;

- - the currency or currencies, including composite currencies or currency units,
  in which that series of subordinated debt securities may be denominated or in
  which payment of the principal of and interest, if any, on that series of
  subordinated debt securities shall be payable, if other than the currency of
  the United States of America, and, if so, whether that series of subordinated
  debt securities may be satisfied and discharged other than as provided in
  Article Four of the Subordinated Indenture;

- - if the amounts of payments of principal of and interest, if any, on that
  series of subordinated debt securities are to be determined with reference to
  an index, formula or other method, or based on a

                                       17
<PAGE>   19

  coin or currency other than that in which that series of subordinated debt
  securities are stated to be payable, the manner in which such amounts shall be
  determined and the calculation agent, if any, with respect thereto;

- - if other than the principal amount thereof, the portion of the principal
  amount of that series of subordinated debt securities that will be payable
  upon declaration of acceleration of the maturity thereof pursuant to an event
  of default;

- - if other than as defined in the Subordinated Indenture, the meaning of
  "Business Day" when used with respect to that series of subordinated debt
  securities;

- - if that series of subordinated debt securities may be issued or delivered
  (whether upon original issuance or upon exchange of a temporary security of
  such series or otherwise), or any installment of principal or interest is
  payable, only upon receipt of certain certificates or other documents or
  satisfaction of other conditions in addition to those specified in the
  Subordinated Indenture, the forms and terms of those certificates, documents
  or conditions;

- - the right, if any, to extend the interest payment periods and the duration of
  the extensions;

- - the terms, if any, pursuant to which any series of subordinated debt
  securities will be subordinate to any of Occidental's debt;

- - any addition to, or modification or deletion of, any event of default,
  covenant of Occidental or other term or provision specified in the
  Subordinated Indenture with respect to that series of subordinated debt
  securities; and

- - any other terms (which terms may be inconsistent with the Subordinated
  Indenture).

CONSOLIDATION, MERGER OR SALE

The Subordinated Indenture generally permits Occidental to merge or consolidate,
or sell, convey, transfer or otherwise dispose of its assets as an entirety or
substantially as an entirety, provided that no event of default would occur as a
result of that transaction. However, any successor or acquiror of such assets
must assume all of the obligations of Occidental under the Subordinated
Indenture and the subordinated debt securities and be organized and existing
under U.S. laws.

EVENTS OF DEFAULT UNDER THE SUBORDINATED INDENTURE

The following are events of default under the Subordinated Indenture with
respect to any series of subordinated debt securities issued:

- - failure to pay interest when due and such failure continues for 30 days and
  the time for payment has not been extended or deferred;

- - failure to pay the principal (or premium, if any) when due;

- - failure to observe or perform any other covenant contained in the subordinated
  debt securities or the Subordinated Indenture (other than a covenant
  specifically benefitting only another series of subordinated debt securities),
  and such failure continues for 90 days after Occidental receives notice from
  the Subordinated Indenture Trustee or holders of at least 25 percent in
  aggregate principal amount of the outstanding subordinated debt securities of
  that series;

- - certain events of bankruptcy, insolvency or reorganization of Occidental;

- - if that series of subordinated debt securities are held by a trust, the
  voluntary or involuntary dissolution, winding up or termination of the trust
  that owns the series

                                       18
<PAGE>   20

  of subordinated debt securities, except in connection with:

  (1) the distribution of that series of subordinated debt securities to holders
  of preferred and common securities of the trust;

  (2) the redemption of all of the preferred and common securities of the trust;
  or

  (3) mergers, consolidations or amalgamations permitted by the Declaration of
  the trust; and

- - any other event of default specified in the prospectus supplement or pricing
  supplement, if any, relating to that series of subordinated debt securities.

If an event of default with respect to subordinated debt securities of any
series occurs and is continuing, the Subordinated Indenture Trustee or the
holders of at least 25 percent in aggregate principal amount of the outstanding
subordinated debt securities of that series, by notice in writing to Occidental
(and to the Subordinated Indenture Trustee if notice is given by such holders),
may declare the principal of (or if such subordinated debt securities are
discount securities, the portion of the principal amount as specified in the
applicable prospectus supplement or pricing supplement, if any), premium, if
any, and accrued interest, if any, due and payable immediately.

The holders of a majority in aggregate principal amount of the outstanding
subordinated debt securities of an affected series (or if that series of
subordinated debt securities are held by a trust, the holders of at least a
majority in aggregate liquidation amount of the trust's preferred securities)
may waive any past default or event of default with respect to that series and
its consequences, except defaults or events of default regarding:

- - payment of principal or interest; or

- - covenants that cannot be modified or amended without the consent of each
  holder of any outstanding subordinated debt securities affected (as described
  under "-- Modification of Subordinated Indenture; Waiver" below).

Any waiver shall cure the corresponding default or event of default.

If the subordinated debt securities of any series are held by a trust, and a
Declaration Event of Default (as defined under "Description of Preferred
Securities -- Declaration Events of Default" below) has occurred and is
attributable to Occidental's failure to pay principal, premium, if any, or
interest on, those subordinated debt securities, then each holder of the
preferred securities of the trust may sue Occidental, or seek other remedies to
force payment to the holder of the principal of, premium, if any, or interest
on, those subordinated debt securities having a principal amount equal to the
aggregate liquidation amount of the preferred securities held by the holder.

Subject to the terms of the Subordinated Indenture, if an event of default under
the Subordinated Indenture shall occur and be continuing, the Subordinated
Indenture Trustee will be under no obligation to exercise any of its rights or
powers under the Subordinated Indenture at the request or direction of any of
the holders of the applicable series of subordinated debt securities, unless the
holders have offered the Subordinated Indenture Trustee reasonable security or
indemnity. The holders of a majority in principal amount of the outstanding
subordinated debt securities of any series will have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Subordinated Indenture Trustee, or exercising any trust or power conferred
on the Subordinated Indenture Trustee, with respect to the

                                       19
<PAGE>   21

subordinated debt securities of that series, provided that:

- - the direction given to the Subordinated Indenture Trustee is not in conflict
  with any law or the Subordinated Indenture;

- - the Subordinated Indenture Trustee may take any other action deemed proper by
  it which is not inconsistent with that direction; and

- - the Subordinated Indenture Trustee has not determined that the action would be
  unjustly prejudicial to the holders not involved in the proceeding.

A holder of the subordinated debt securities of any series will have the right
to institute a proceeding under the Subordinated Indenture or to appoint a
receiver or trustee, or to seek other remedies only if:

- - the holder has given written notice to the Subordinated Indenture Trustee of a
  continuing event of default with respect to that series;

- - the holders of at least 25 percent in aggregate principal amount of the
  outstanding subordinated debt securities of that series have made written
  request to, and have offered reasonable indemnity to, the Subordinated
  Indenture Trustee to institute the proceedings as trustee; and

- - the Subordinated Indenture Trustee does not institute the proceeding, and does
  not receive from the holders of a majority in aggregate principal amount of
  the outstanding subordinated debt securities of that series other conflicting
  directions, within 60 days after the notice, request and offer.

These limitations do not apply to a suit instituted by a holder of subordinated
debt securities if Occidental defaults in the payment of the principal, premium,
if any, or interest on, the subordinated debt securities.

Occidental will periodically file statements with the Subordinated Indenture
Trustee regarding its compliance with the conditions and covenants in the
Subordinated Indenture.

MODIFICATION OF SUBORDINATED INDENTURE; WAIVER

Occidental and the Subordinated Indenture Trustee may change the Subordinated
Indenture without the consent of any holders with respect to certain matters,
including:

- - evidencing the succession of another person to Occidental and the assumption
  by it of the covenants of Occidental in the Subordinated Indenture and the
  corresponding series of securities;

- - adding to the covenants, agreements and obligations of Occidental for the
  benefit of the holders of that series of subordinated debt securities, or to
  surrender any right or power the Subordinated Indenture confers upon
  Occidental;

- - evidencing and providing for the acceptance of appointment under the
  Subordinated Indenture of a successor Subordinated Indenture Trustee with
  respect to the securities of one or more series and to add to or change any
  provision of the Subordinated Indenture as shall be necessary to provide for
  or facilitate the administration of the trusts by more than one Subordinated
  Indenture Trustee;

- - curing any ambiguity or correcting any inconsistency in the Subordinated
  Indenture or making other provisions with respect to matters or questions
  arising under the Subordinated Indenture;

- - adding, changing or eliminating any provisions of the Subordinated Indenture
  (which addition, change or elimination may apply to one or more series of
  subordinated debt securities), provided that the addition, change or
  elimination neither (a) applies to

                                       20
<PAGE>   22

  any security of any series created prior to the execution of the supplemental
  indenture that is entitled to the benefit of the provision nor (b) modifies
  the rights of holders of the securities with respect to the modified
  provisions;

- - securing the securities; or

- - changing anything else that does not adversely affect the interests of any
  holder of subordinated debt securities.

In addition, under the Subordinated Indenture, the rights of holders of a series
of subordinated debt securities may be changed by Occidental and the
Subordinated Indenture Trustee with the written consent of the holders of at
least a majority in aggregate principal amount of the outstanding subordinated
debt securities of each series that is affected. However, the following changes,
among other things, may only be made with the consent of each holder of any
outstanding subordinated debt securities affected:

- - changing the stated maturity of such subordinated debt securities;

- - reducing the principal amount of a discount security payable upon declaration
  of acceleration;

- - reducing the principal amount, reducing the rate of or extending the time of
  payment of interest, or reducing any premium payable upon the redemption of
  any of the subordinated debt securities;

- - changing the place or currency of payment of principal or interest, if any, on
  any of the subordinated debt securities;

- - impairing the right to institute suit for the enforcement of any payment on or
  with respect to any of the subordinated debt securities; and

- - modifying any of the foregoing requirements or reducing the percentage of
  subordinated debt securities, the holders of which are required to consent to
  any amendment or waiver of any covenant or past default.

If the consent of the Property Trustee of a trust, as the sole holder of
subordinated debt securities held by the trust, is required to consent to any
amendment, modification or termination of the Subordinated Indenture, the
Property Trustee will request directions from the holders of the preferred
securities of the applicable trust.

FORM, EXCHANGE, AND TRANSFER

The subordinated debt securities of each series may be issued as registered
securities, as bearer securities (with or without coupons) or both. Unless
otherwise specified in the applicable prospectus supplement or the pricing
supplement, if any, registered securities will be issued in denominations of
$1,000 and any integral multiple thereof and bearer securities will be issued in
denominations of $5,000 and $100,000. Subject to the terms of the Subordinated
Indenture and the limitations applicable to global securities described in the
applicable prospectus supplement or the pricing supplement, if any, registered
securities will be exchangeable for other registered securities of the same
series, in any authorized denomination and of like tenor and aggregate principal
amount.

Subject to the terms of the Subordinated Indenture and the limitations
applicable to global securities set forth in the applicable prospectus
supplement or pricing supplement, if any, subordinated debt securities issued as
registered securities may be presented for exchange or for registration of
transfer (duly endorsed or with the form of transfer duly executed) at the
office of the Security Registrar or at the office of any transfer agent
designated by Occidental for that purpose. Bearer securities will not be issued
in exchange for registered securities. Unless other-

                                       21
<PAGE>   23

wise provided in the subordinated debt securities to be transferred or
exchanged, no service charge will be made for any registration of transfer or
exchange, but Occidental may require payment of any taxes or other governmental
charges. Occidental has appointed the Subordinated Indenture Trustee as Security
Registrar. Any transfer agent (in addition to the Security Registrar) initially
designated by Occidental for any subordinated debt securities will be named in
the applicable prospectus supplement. Occidental may at any time designate
additional transfer agents or rescind the designation of any transfer agent or
approve a change in the office through which any transfer agent acts, except
that Occidental will be required to maintain a transfer agent in each place of
payment for the subordinated debt securities of each series.

If the subordinated debt securities of any series are to be redeemed, Occidental
will not be required to:

- - issue, register the transfer of, or exchange any subordinated debt securities
  of, that series during a period beginning at the opening of business 15 days
  before any selection of subordinated debt securities for redemption and
  ending, in the case of registered securities, at the close of business on the
  day of mailing of the relevant notice of redemption and, in the case of bearer
  securities, the first publication date of the notice, or if the subordinated
  debt securities of that series are also issuable as registered securities and
  there is no publication, at the close of business on the day of mailing of the
  notice;

- - in the case of registered securities, register the transfer of or exchange any
  subordinated debt securities so selected for redemption, in whole or in part,
  except the unredeemed portion of any registered security being redeemed in
  part; or

- - in the case of bearer securities, exchange any subordinated debt securities so
  selected for redemption, except to exchange a bearer security for a registered
  security that is immediately surrendered for redemption.

GLOBAL SECURITIES

The subordinated debt securities of each series may be issued in whole or in
part in global form. A subordinated debt security in global form will be
deposited with, or on behalf of, a depositary, which will be named in an
applicable prospectus supplement or pricing supplement, if any. A global
security may be issued in either registered or bearer form and in either
temporary or definitive form. A global subordinated debt security may not be
transferred, except as a whole among the depositary for those subordinated debt
securities and/or its nominees and/or successors. If any subordinated debt
securities of a series are issuable as global securities, the applicable
prospectus supplement or pricing supplement, if any, will describe any
circumstances when beneficial owners of interests in that global security may
exchange their interests for definitive subordinated debt securities of like
series and tenor and principal amount in any authorized form and denomination,
the manner of payment of principal of and interest, if any, on that global
subordinated debt security and the specific terms of the depositary arrangement
with respect to that global subordinated debt security.

DISCHARGE

Unless otherwise indicated in an applicable prospectus supplement or pricing
supplement, if any, Occidental may terminate at any time its obligations under
the Subordinated Indenture with respect to any series of subordinated debt
securities by (1)(a) delivering all of the outstanding securities of that series
to the Subordinated Indenture Trustee to be cancelled

                                       22
<PAGE>   24

or (b) depositing with the Subordinated Indenture Trustee funds or non-callable
United States government obligations sufficient to pay all remaining principal
and interest on the series of subordinated debt securities and (2) complying
with selected other provisions of the Subordinated Indenture.

If Occidental elects to satisfy its obligations by depositing United States
obligations as described above ("discharge"), that election under present law is
likely to be treated as a redemption of the subordinated debt securities of that
series prior to maturity in exchange for the property deposited in trust. If so,
each holder would generally recognize, at the time of discharge, gain or loss
for United States federal income tax purposes measured by the difference between
(1) the sum of (a) the amount of any cash and (b) the fair market value of any
property deposited in trust deemed received by the holder (unless attributable
to accrued interest) and (2) the holder's tax basis in the subordinated debt
securities deemed surrendered. After the discharge, each holder would be treated
as if it held an undivided interest in the cash (or investments made therewith)
and the property held in trust. Each holder would generally be subject to tax
liability in respect of interest income and original issue discount, if
applicable, thereon and would recognize any gain or loss upon any disposition,
including redemption, of the assets held in trust. Although tax might be owed,
the holder of a discharged subordinated debt security would not receive cash
(except for current payments of interest on that subordinated debt security)
until the maturity or earlier redemption of that subordinated debt security.
United States federal income tax treatment of this nature could affect the
purchase price that a holder would receive upon the sale of the subordinated
debt securities.

INFORMATION CONCERNING THE SUBORDINATED INDENTURE TRUSTEE

The Subordinated Indenture Trustee, other than during the occurrence and
continuance of an event of default under the Subordinated Indenture, undertakes
to perform only those duties as are specifically set forth in the Subordinated
Indenture and, upon an event of default under the Subordinated Indenture, must
use the same degree of care as a prudent person would exercise or use in the
conduct of his or her own affairs. Subject to this provision, the Subordinated
Indenture Trustee is under no obligation to exercise any of the powers given it
by the Subordinated Indenture at the request of any holder of subordinated debt
securities unless it is offered reasonable security and indemnity by that holder
against the costs, expenses and liabilities that it might incur. The
Subordinated Indenture Trustee is not required to spend or risk its own money or
otherwise become financially liable while performing its duties unless it
reasonably believes that it will be repaid or receive adequate indemnity.

The Bank of New York is a participating lender under one of Occidental's
revolving credit agreements, provides commercial banking services to Occidental
and its affiliates and acts as the property trustee, preferred securities
guarantee trustee and (through an affiliate) the Delaware trustee with respect
to an issue of trust preferred securities issued by an affiliate of Occidental.
The Bank of New York is the Senior Indenture Trustee and will also act as the
Subordinated Indenture Trustee, the Property Trustee and the Preferred
Securities Guarantee Trustee. In addition, an affiliate of The Bank of New York
will act as the Delaware Trustee under each trust. However, if The Bank of New
York acquires any conflicting interest when an event of default is pending, it
must (with certain exceptions) eliminate the conflict or resign.

                                       23
<PAGE>   25

PAYMENT AND PAYMENT AGENTS

Unless otherwise indicated in the applicable prospectus supplement or pricing
supplement, if any, payment of the interest on any subordinated debt securities
(other than bearer securities) on any interest payment date will be made to the
person in whose name those subordinated debt securities (or one or more
predecessor securities) are registered at the close of business on the regular
record date for the interest.

Principal of and any premium and interest on the subordinated debt securities
(other than bearer securities) of a particular series will be payable at the
office of the paying agents that Occidental designates, except that, unless
otherwise indicated in the applicable prospectus supplement or pricing
supplement, if any, interest payments may be made by wire transfer or by check
mailed to the holder. Unless otherwise indicated in the applicable prospectus
supplement or pricing supplement, if any, the corporate trust office of the
Subordinated Indenture Trustee in The City of New York will be designated as
sole paying agent for payments with respect to subordinated debt securities of
each series. Any other paying agents initially designated by Occidental for the
subordinated debt securities of a particular series will be named in the
applicable prospectus supplement or pricing supplement, if any. Occidental will
be required to maintain a paying agent in each place of payment for the
subordinated debt securities of a particular series.

Unless otherwise indicated in the applicable prospectus supplement or pricing
supplement, if any, interest will be computed on the basis of a 360-day year
comprised of twelve 30-day months.

Unless otherwise indicated in an applicable prospectus supplement or pricing
supplement, if any, payment of principal of and interest, if any, on bearer
securities will be made, subject to any applicable laws and regulations, at the
offices of a paying agent outside the United States as Occidental may designate,
or by check mailed to any address or by transfer to an account maintained by the
payee outside the United States. Unless otherwise indicated in an applicable
prospectus supplement or pricing supplement, if any, any payment of an
installment of interest on any bearer security will be made only if the coupon
relating to the interest installment is surrendered.

All moneys that Occidental pays to a paying agent or the Subordinated Indenture
Trustee for the payment of the principal of or any premium or interest on any
subordinated debt securities which remain unclaimed at the end of two years
after that principal, premium or interest has become due and payable will be
repaid to Occidental, and the holder of the security thereafter may look only to
Occidental for payment thereof.

GOVERNING LAW

The Subordinated Indenture and subordinated debt securities will be governed by
and construed in accordance with the laws of the State of New York except to the
extent that the Trust Indenture Act shall be applicable.

DESCRIPTION OF PREFERRED STOCK

GENERAL

Occidental's Restated Certificate of Incorporation, as amended, authorizes
Occidental's Board of Directors, without further stockholder action, to provide
for the issuance of up to 50,000,000 shares of preferred stock, par value $1.00
per share, in one or more series, and to fix the designations, terms, and
relative rights and preferences, including the dividend rate, voting rights,
conversion rights, redemption and sinking fund provisions and liquidation values
of each of these series. Occidental may amend from time to time its restated
certificate to increase the number of authorized shares of preferred stock. Any
                                       24
<PAGE>   26

such amendment would require the approval of the holders of a majority of
Occidental's stock entitled to vote. As of the date of this prospectus,
Occidental has 4,762,294 shares of $3.00 Cumulative CXY-Indexed Convertible
Preferred Stock outstanding.

The particular terms of any series of preferred stock that Occidental offers
under this prospectus will be described in the applicable prospectus supplement
relating to that series of preferred stock. Those terms may include:

- - the title and liquidation preference per share of the preferred stock and the
  number of shares offered;

- - the purchase price of the preferred stock;

- - the dividend rate (or method of calculation), the dates on which dividends
  will be paid, whether dividends shall be cumulative and, if so, the date from
  which dividends will begin to accumulate;

- - any redemption or sinking fund provisions of the preferred stock;

- - any conversion provisions of the preferred stock (which will not include
  conversion into common stock);

- - the voting rights, if any, of the preferred stock; and

- - any additional dividend, liquidation, redemption, sinking fund and other
  rights, preferences, privileges, limitations and restrictions of the preferred
  stock.

If the terms of any series of preferred stock being offered differ from the
terms set forth in this prospectus, those terms will also be disclosed in the
applicable prospectus supplement relating to that series of preferred stock. The
summary in this prospectus is not complete. You should refer to the certificate
of designations establishing a particular series of preferred stock which will
be filed with the Secretary of State of the State of Delaware and the SEC in
connection with the offering of the preferred stock.

The preferred stock will, when issued, be fully paid and nonassessable.

DIVIDEND RIGHTS

The preferred stock will be preferred over the common stock as to payment of
dividends. Before any dividends or distributions (other than dividends or
distributions payable in common stock or other stock ranking junior to that
series of preferred stock as to dividends and upon liquidation) on the common
stock or other stock ranking junior to that series of preferred stock as to
dividends and upon liquidation shall be declared and set apart for payment or
paid, the holders of shares of each series of preferred stock (unless otherwise
set forth in the applicable prospectus supplement) will be entitled to receive
dividends when, as and if declared by Occidental's Board of Directors or, if
dividends are cumulative, full cumulative dividends for the current and all
prior dividend periods. Occidental will pay those dividends either in cash,
shares of preferred stock or otherwise, at the rate and on the date or dates set
forth in the applicable prospectus supplement. With respect to each series of
preferred stock that has cumulative dividends, the dividends on each share of
the series will be cumulative from the date of issue of the share unless some
other date is set forth in the prospectus supplement relating to the series.
Accruals of dividends will not bear interest. The applicable prospectus
supplement will indicate the relative ranking of the particular series of the
preferred stock as to the payment of dividends, as compared with then existing
and future series of preferred stock.

RIGHTS UPON LIQUIDATION

The preferred stock of each series will be preferred over the common stock and
other

                                       25
<PAGE>   27

stock ranking junior to that series of preferred stock as to assets so that the
holders of that series of preferred stock (unless otherwise set forth in the
applicable prospectus supplement) will be entitled to be paid, upon Occidental's
voluntary or involuntary liquidation, dissolution or winding up and before any
distribution is made to the holders of common stock and other stock ranking
junior to that series of preferred stock, the amount set forth in the applicable
prospectus supplement. However, in this case the holders of preferred stock of
that series will not be entitled to any other or further payment. If upon any
liquidation, dissolution or winding up Occidental's net assets are insufficient
to permit the payment in full of the respective amounts to which the holders of
all outstanding preferred stock are entitled, Occidental's entire remaining net
assets will be distributed among the holders of each series of preferred stock
in amounts proportional to the full amounts to which the holders of each series
are entitled, subject to any provisions of any series of preferred stock that
rank it junior or senior to other series of preferred stock upon liquidation.
The applicable prospectus supplement will indicate the relative ranking of the
particular series of the preferred stock upon liquidation, as compared with then
existing and future series of preferred stock.

REDEMPTION

The shares of any series of preferred stock will be redeemable to the extent set
forth in the prospectus supplement relating to the series.

VOTING RIGHTS

Except as indicated in the applicable prospectus supplement or as otherwise from
time to time required by law, the holders of preferred stock will have no voting
rights.

CERTAIN PROVISIONS OF THE RESTATED CERTIFICATE OF INCORPORATION AND BY-LAWS

The Restated Certificate of Incorporation, as amended, and By-laws of Occidental
contain certain provisions which may have the effect of delaying, deferring or
preventing a change of control of Occidental. The By-laws limit the ability of
stockholders to change the number of directors. Only the Board of Directors or
the Chairman of the Board of Directors may call a special meeting of our
stockholders, and any action required or permitted to be taken by the
stockholders of Occidental must be effected at an annual or special meeting of
stockholders of Occidental and may not be effected by any consent in writing of
such stockholders. The By-laws of Occidental contain certain requirements
concerning advance notice of (i) nominations by stockholders of persons for
election to the Board of Directors and (ii) other matters introduced by
stockholders at annual meetings. In addition, the Board of Directors generally
has the authority, without further action by stockholders, to fix the relative
powers, preferences and rights of the unissued shares of preferred stock of
Occidental. Provisions which could discourage an unsolicited tender offer or
takeover proposal, such as extraordinary voting, dividend, redemption or
conversion rights, could be included in a series of preferred stock.

DESCRIPTION OF DEPOSITARY SHARES

GENERAL

Occidental may elect to offer fractional shares of preferred stock of a series,
rather than full shares of preferred stock. Occidental will issue to the public
receipts for depositary shares, and each of these depositary shares will
represent a fraction of a share of a particular series of preferred stock. The
fraction of a share of preferred stock represented

                                       26
<PAGE>   28

by each depositary share will be set forth in the applicable prospectus
supplement.

The shares of any series of preferred stock underlying the depositary shares
will be deposited under a deposit agreement between Occidental and a bank or
trust company selected by Occidental. The depositary will have its principal
office in the United States and a combined capital and surplus of at least
$50,000,000. Subject to the terms of the deposit agreement, each holder of a
depositary share will be entitled, in proportion to the applicable fraction of a
share of preferred stock underlying that depositary share, to all the rights and
preferences of the preferred stock underlying that depositary share. Those
rights include dividend, voting, redemption and liquidation rights.

The depositary shares will be evidenced by depositary receipts issued pursuant
to the deposit agreement. Occidental will distribute depositary receipts to
those persons purchasing the fractional shares of preferred stock of a series
underlying the depositary shares, in accordance with the terms of the offering.
Occidental will file copies of the forms of deposit agreement and depositary
receipt as exhibits to the registration statement. The following summary of the
deposit agreement, the depositary shares and the depositary receipts is not
complete and is subject to and qualified in its entirety by reference to the
forms of the deposit agreement and depositary receipts that Occidental will file
with the SEC in connection with the offering of the specific depositary shares.

Pending the preparation of definitive engraved depositary receipts, the
depositary may, upon Occidental's written order, issue temporary depositary
receipts substantially identical to the definitive depositary receipts but not
in definitive form. These temporary depositary receipts entitle their holders to
all the rights of definitive depositary receipts which Occidental will prepare
without unreasonable delay. Temporary depositary receipts will then be
exchangeable for definitive depositary receipts at Occidental's expense.

DIVIDENDS AND OTHER DISTRIBUTIONS

The depositary will distribute all cash dividends or other cash distributions
received with respect to the applicable series of preferred stock to the record
holders of depositary shares relating to the preferred stock of that series in
proportion to the number of depositary shares owned by those holders.

If there is a distribution other than in cash, the depositary will distribute
property received by it to the record holders of depositary shares that are
entitled to receive the distribution, unless the depositary determines that the
distribution cannot be made proportionately or it is not feasible to make the
distribution. If this occurs, the depositary may, with Occidental's approval,
sell the property and distribute the net proceeds from the sale to the
applicable holders or adopt another method of distribution as it deems
equitable.

CONVERSION OR EXCHANGE

If a series of preferred stock represented by depositary shares is subject to
provisions relating to conversion or exchange as set forth in the applicable
prospectus supplement, each holder of the related depositary shares will have
the right or obligation to convert or exchange depositary shares in accordance
with its terms.

REDEMPTION OF DEPOSITARY SHARES

If a series of preferred stock represented by depositary shares is subject to
redemption, the depositary shares will be redeemed from the proceeds received by
the depositary resulting from the redemption, in whole or in part, of that
series of preferred stock held by the depositary. The redemption price per
deposi-

                                       27
<PAGE>   29

tary share will be equal to the applicable fraction of the redemption price per
share payable with respect to that series of the preferred stock. Whenever
Occidental redeems shares of preferred stock that are held by the depositary,
the depositary will redeem, as of the same redemption date, the number of
depositary shares representing the shares of preferred stock so redeemed. If
fewer than all the depositary shares are to be redeemed, the depositary shares
to be redeemed will be selected by lot or pro rata as may be determined by
Occidental. The rights of holders of depositary shares after the date fixed for
redemption will be described in the applicable prospectus supplement.

VOTING THE PREFERRED STOCK

Upon receipt of notice of any meeting at which the holders of the preferred
stock are entitled to vote, the depositary will mail the information contained
in the notice to the record holders of the depositary shares underlying the
preferred stock. Each record holder of the depositary shares on the record date
(which will be the same date as the record date for the preferred stock) will be
entitled to instruct the depositary as to the exercise of the voting rights
pertaining to the amount of the preferred stock represented by that holder's
depositary shares. The depositary will then try, as far as practicable, to vote
the number of shares of preferred stock underlying those depositary shares in
accordance with the instructions. Occidental will agree to take all reasonable
actions which may be deemed necessary by the depositary to enable the depositary
to do so. The depositary will not vote the shares of preferred stock to the
extent it does not receive specific instructions from the holders of depositary
shares underlying the preferred stock.

AMENDMENT AND TERMINATION OF THE DEPOSIT AGREEMENT

The form of depositary receipt evidencing the depositary shares and any
provision of the deposit agreement may at any time be amended by agreement
between Occidental and the depositary. However, any amendment which materially
and adversely alters the rights of the holders of depositary shares will not be
effective unless the amendment has been approved by the holders of at least a
majority of the depositary shares then outstanding.

Whenever so directed by Occidental, the depositary will terminate the deposit
agreement by mailing notice of termination to the record holders of all
depositary receipts then outstanding at least 30 days prior to the date fixed in
the notice for termination. The depositary may likewise terminate the deposit
agreement if at any time 60 days shall have expired after the depositary shall
have delivered to Occidental a written notice of its election to resign and a
successor depositary shall not have been appointed and accepted its appointment.
If any depositary receipts remain outstanding after the date of termination, the
depositary thereafter will discontinue the transfer of depositary receipts, will
suspend the distribution of dividends to the holders thereof, and will not give
any further notices (other than notice of termination) or perform any further
acts under the deposit agreement except that the depositary will continue (1) to
collect dividends on the preferred stock and any other distributions with
respect thereto and (2) to deliver the preferred stock together with those
dividends and distributions and the net proceeds of any sales of rights,
preferences, privileges and other property, without liability for interest
thereon, in exchange for depositary receipts surrendered.

                                       28
<PAGE>   30

CHARGES OF DEPOSITARY

Occidental will pay charges of the depositary in connection with the initial
deposit of the preferred stock, any redemption of the preferred stock and other
administrative matters. Holders of depositary receipts will pay transfer and
other taxes and governmental charges and those other charges, including a fee
for the withdrawal of shares of preferred stock upon surrender of depositary
receipts, as are expressly provided in the deposit agreement to be for their
accounts.

MISCELLANEOUS

The depositary will forward to holders of depositary receipts all reports and
communications from Occidental delivered to the depositary required to be
furnished to the holders of the preferred stock.

Neither Occidental nor the depositary will be liable if it is prevented or
delayed by law or any circumstance beyond its control in performing its
respective obligations under the deposit agreement. Occidental's obligations and
those of the depositary will be limited to performance in good faith of its
respective duties under the deposit agreement. Neither Occidental nor the
depositary will be obligated to prosecute or defend any legal proceeding in
respect of any depositary shares or preferred stock unless satisfactory
indemnity is furnished. Occidental and the depositary may rely upon written
advice of counsel or accountants, or upon information provided by persons
presenting preferred stock for deposit, holders of depositary receipts or other
persons believed to be competent and on documents believed to be genuine.

RESIGNATION AND REMOVAL OF DEPOSITARY

The depositary may resign at any time by delivering notice to Occidental of its
election to resign. Occidental may remove the depositary at any time. Any
resignation or removal will take effect upon the appointment of a successor
depositary and its acceptance of the appointment. The successor depositary must
be appointed within 60 days after delivery of the notice of resignation or
removal and must be a bank or trust company having its principal office in the
United States and having a combined capital and surplus of at least $50,000,000.

DESCRIPTION OF PREFERRED SECURITIES

GENERAL

Each Declaration authorizes the Regular Trustees to issue on behalf of each
trust one series of preferred securities which will have the terms described in
a prospectus supplement. The proceeds from the sale of a trust's preferred and
common securities will be used by that trust to purchase a series of
subordinated debt securities issued by Occidental. The subordinated debt
securities will be held in trust by the Property Trustee for the benefit of the
holders of the trust's preferred and common securities.

Under each Preferred Securities Guarantee, Occidental will agree to make
payments of distributions and payments on redemption or liquidation with respect
to a trust's preferred securities, but only to the extent the trust has funds
available to make those payments and has not made such payments. See
"Description of the Preferred Securities Guarantees."

The assets of a trust available for distribution to the holders of its preferred
securities will be limited to payments from Occidental under the series of
subordinated debt securities held by the trust. If Occidental fails to make a
payment on those subordinated debt securities, the trust will not have
sufficient funds to make related payments, including distributions, on its
preferred securities.

Each Preferred Securities Guarantee, when taken together with Occidental's
obligations under the related series of subordinated debt

                                       29
<PAGE>   31

securities, the Subordinated Indenture and the related Declaration, will provide
a full and unconditional guarantee of amounts due on the preferred securities
issued by a trust.

Each Declaration will be qualified as an indenture under the Trust Indenture
Act. Each Property Trustee will act as indenture trustee for the preferred
securities to be issued by the applicable trust, in order to comply with the
provisions of the Trust Indenture Act.

Each series of preferred securities will have the terms, including
distributions, redemption, voting, liquidation rights and other preferred,
deferred or special rights or restrictions as described in the relevant
Declaration or made part of such Declaration by the Trust Indenture Act or the
Delaware Business Trust Act. The terms of any preferred securities will mirror
the terms of the subordinated debt securities held by the trust that issues the
preferred securities.

The prospectus supplement relating to the preferred securities of a trust will
describe the specific terms of the preferred securities, including:

- - the name of the preferred securities;

- - the dollar amount and number of securities issued;

- - any provision relating to deferral of distribution payments;

- - the annual distribution rate(s) (or method of determining that rate(s)), the
  payment date(s) and the record dates used to determine the holders who are to
  receive distributions;

- - the date from which distributions shall be cumulative;

- - the optional redemption provisions, if any, including the prices, time periods
  and other terms and conditions for which the preferred securities shall be
  purchased or redeemed, in whole or in part;

- - the terms and conditions, if any, upon which the applicable series of
  subordinated debt securities may be distributed to holders of the preferred
  securities;

- - the voting rights, if any, of holders of the preferred securities;

- - any securities exchange on which the preferred securities will be listed;

- - whether the preferred securities are to be issued in book-entry form and
  represented by one or more global certificates and, if so, the depository for
  the global certificates and the specific terms of the depositary arrangements;
  and

- - any other relevant rights, preferences, privileges, limitations or
  restrictions of the preferred securities.

Each prospectus supplement will describe certain United States federal income
tax considerations applicable to the purchase, holding and disposition of the
series of preferred securities covered by that prospectus supplement.

LIQUIDATION DISTRIBUTION UPON DISSOLUTION

Unless otherwise specified in an applicable prospectus supplement, each
Declaration states that the related trust shall be dissolved:

- - on the expiration of the term of the trust;

- - upon the bankruptcy of Occidental;

- - upon the filing of a certificate of dissolution or its equivalent with respect
  to Occidental;

- - upon the filing of a certificate of cancellation with respect to the trust
  after obtaining the consent of at least a majority in liquidation amount of
  the preferred and common securities of the trust, voting together as a single
  class;

                                       30
<PAGE>   32

- - 90 days after the revocation of the charter of Occidental (but only if the
  charter is not reinstated during that 90-day period);

- - upon the distribution of the related subordinated debt securities directly to
  the holders of the preferred and common securities of the trust;

- - upon the redemption of all of the common and preferred securities of the
  trust; or

- - upon entry of a court order for the dissolution of Occidental, or the trust.

Unless otherwise specified in an applicable prospectus supplement, in the event
of a dissolution, after the trust pays all amounts owed to creditors, the
holders of the preferred and common securities will be entitled to receive:

- - cash equal to the aggregate liquidation amount of each preferred and common
  security specified in an accompanying prospectus supplement, plus accumulated
  and unpaid distributions to the date of payment; unless

- - subordinated debt securities in an aggregate principal amount equal to the
  aggregate liquidation amount of the preferred and common securities are
  distributed to the holders of the preferred and common securities.

If the trust cannot pay the full amount due on its preferred and common
securities because insufficient assets are available for payment, then the
amounts payable by the trust on its preferred and common securities shall be
paid pro rata. However, if an event of default under the related Declaration has
occurred, the total amounts due on the preferred securities will be paid before
any distribution on such common securities.

DECLARATION EVENTS OF DEFAULT

An event of default under the Subordinated Indenture relating to a series of
subordinated debt securities is an event of default under the Declaration of the
trust that owns these subordinated debt securities (a "Declaration Event of
Default"). See "Description of the subordinated debt securities -- Events of
Default Under the Subordinated Indenture."

Occidental and the Regular Trustees of a trust must file annually with the
Property Trustee a certificate stating whether or not they are in compliance
with all the applicable conditions and covenants under the related Declaration.

Upon the occurrence of a Declaration Event of Default, the Property Trustee of
the applicable trust, as the sole holder of the subordinated debt securities
held by that trust, will have the right under the Subordinated Indenture to
declare the principal of, premium, if any, and interest on the subordinated debt
securities to be immediately due and payable.

If a Property Trustee fails to enforce its rights under the related Declaration
or the Subordinated Indenture to the fullest extent permitted by law and subject
to the terms of the Declaration and the Subordinated Indenture, any holder of
the preferred securities issued by the related trust may sue Occidental, or seek
other remedies, to enforce the Property Trustee's rights under the Declaration
or the Subordinated Indenture without first instituting a legal proceeding
against such Property Trustee or any other person.

If Occidental fails to pay principal, premium, if any, or interest on a series
of subordinated debt securities when payable, then a holder of the related
preferred securities issued by a trust which owns those notes may directly sue
Occidental or seek other remedies, to collect its pro rata share of payments
owed.

REMOVAL AND REPLACEMENT OF TRUSTEES

Only the holder of a trust's common securities has the right to remove or
replace the

                                       31
<PAGE>   33

trustees of that trust. The resignation or removal of any trustee and the
appointment of a successor trustee shall be effective only on the acceptance of
appointment by the successor trustee in accordance with the provisions of the
Declaration for that trust.

MERGERS, CONSOLIDATIONS OR AMALGAMATIONS OF THE TRUSTS

A trust may not consolidate, amalgamate, merge with or into, or be replaced by
or convey, transfer or lease its properties and assets substantially as an
entirety to any other corporation or other body ("Merger Event"), except as
described below. A trust may, with the consent of a majority of its Regular
Trustees and without the consent of the holders of its preferred and common
securities, consolidate, amalgamate, merge with or into, or be replaced by
another trust, if:

- - the successor entity either

  (1) assumes all of the obligations of the trust relating to its preferred and
      common securities; or

  (2) substitutes for the trust's preferred and common securities other
      securities substantially similar to those preferred and common securities
      ("successor securities"), so long as the successor securities rank the
      same as the trust's preferred and common securities for distributions and
      payments upon liquidation, redemption and otherwise;

- - Occidental acknowledges a trustee of the successor entity who has the same
  powers and duties as the Property Trustee of the trust as the holder of the
  particular series of subordinated debt securities;

- - the preferred securities are listed, or any successor securities will be
  listed, upon notice of issuance, on the same national securities exchange or
  other organization that the trust's preferred securities are then listed;

- - the Merger Event does not cause the trust's preferred securities or successor
  securities to be downgraded by any national rating agency;

- - the Merger Event does not adversely affect the rights, preferences and
  privileges of the holders of the trust's preferred and common securities or
  successor securities in any material way (other than with respect to any
  dilution of the holders' interest in the new entity);

- - the successor entity has a purpose identical to that of the trust;

- - prior to the Merger Event, Occidental has received an opinion of counsel from
  a law firm stating that

  (1) the Merger Event does not adversely affect the rights of the holders of
      the trust's preferred securities or any successor securities in any
      material way (other than with respect to any dilution of the holders'
      interest in the new entity); and

  (2) following the Merger Event, neither the trust nor the successor entity
      will be required to register as an investment company under the Investment
      Company Act of 1940, as amended (the "Investment Company Act"); and

- - Occidental guarantees the obligations of the successor entity under the
  successor securities in the same manner as in the applicable Preferred
  Securities Guarantee and the guarantee of the common securities for the trust.

In addition, unless all of the holders of the preferred and common securities
approve otherwise, a trust shall not consolidate, amalgamate, merge with or
into, or be replaced by

                                       32
<PAGE>   34

any other entity or permit any other entity to consolidate, amalgamate, merge
with or into, or replace it, if that transaction would cause the trust or the
successor entity to be classified other than as a grantor trust for United
States federal income tax purposes.

VOTING RIGHTS; AMENDMENT OF DECLARATIONS

The holders of a trust's preferred securities have no voting rights except as
discussed under "-- Mergers, Consolidations or Amalgamations of the Trust" and
"Description of the Preferred Securities Guarantees -- Amendments and
Assignment," and as otherwise required by law and the Declaration for that
trust.

A Declaration may be amended if approved by a majority of the Regular Trustees
of the applicable trust. However, if any proposed amendment provides for, or the
Regular Trustees otherwise propose to effect:

  (1) any action that would adversely affect the powers, preferences or special
      rights of the trust's preferred and common securities, whether by way of
      amendment to the trust's Declaration or otherwise; or

  (2) the dissolution, winding-up or termination of the trust other than
      pursuant to the terms of its Declaration,

then the holders of the trust's preferred and common securities as a single
class will be entitled to vote on the amendment or proposal. In that case, the
amendment or proposal will be effective only if approved by at least a majority
in liquidation amount of the preferred and common securities affected by the
amendment or proposal.

If any amendment or proposal referred to in clause (1) above would adversely
affect only the preferred securities or the common securities of a trust, then
only the affected class will be entitled to vote on the amendment or proposal
and the amendment or proposal will only be effective with the approval of at
least a majority in liquidation amount of the affected class.

No amendment may be made to a Declaration if that amendment would:

- - cause the related trust to be characterized as other than a grantor trust for
  United States federal income tax purposes;

- - reduce or otherwise adversely affect the powers of the Property Trustee; or

- - cause the related trust to be deemed to be an "investment company" which is
  required to be registered under the Investment Company Act.

The holders of a majority in aggregate liquidation amount of the preferred
securities of each trust have the right to:

- - direct the time, method and place of conducting any proceeding for any remedy
  available to the Property Trustee of the trust; or

- - direct the exercise of any trust or power conferred upon such Property Trustee
  under that trust's Declaration, including the right to direct the Property
  Trustee, as the holder of a series of subordinated debt securities, to

  (1) exercise the remedies available under the Subordinated Indenture with
      respect to any subordinated debt securities;

  (2) waive any event of default under the Subordinated Indenture that is
      waivable; or

  (3) cancel an acceleration of the principal of the subordinated debt
      securities.

However, if the Subordinated Indenture requires the consent of the holders of
more than a majority in aggregate principal amount of a series of subordinated
debt securities (a "super-majority"), then the Property Trustee

                                       33
<PAGE>   35

for the series must get approval of the holders of a super-majority in
liquidation amount of the series of preferred securities.

In addition, before taking any of the foregoing actions, the Property Trustee
must obtain an opinion of counsel stating that, as a result of the action will
not result in the failure of the trust to continue to be classified as a grantor
trust for United States federal income tax purposes.

The Property Trustee of a trust will notify all preferred securities holders of
that trust of any notice received from the Subordinated Indenture Trustee with
respect to the subordinated debt securities held by that trust.

As described in each Declaration, the Property Trustee may hold a meeting to
have preferred securities holders vote on a change or have them approve the
change by written consent.

If a vote of preferred securities holders is taken or a consent is obtained, any
preferred securities owned by Occidental or any of its affiliates will, for
purposes of the vote or consent, be treated as if they were not outstanding.
This means:

- - Occidental and any of its affiliates will not be able to vote on or consent to
  matters requiring the vote or consent of holders of preferred securities; and

- - any preferred securities owned by Occidental or any of its affiliates will not
  be counted in determining whether the required percentage of votes or consents
  has been obtained.

INFORMATION CONCERNING THE PROPERTY TRUSTEES

For matters relating to compliance with the Trust Indenture Act, the Property
Trustee of each trust will have all of the duties and responsibilities of an
indenture trustee under the Trust Indenture Act. Each Property Trustee, other
than during the occurrence and continuance of a Declaration Event of Default
under the applicable trust, undertakes to perform only those duties as are
specifically set forth in the applicable Declaration and, upon a Declaration
Event of Default, must use the same degree of care and skill as a prudent person
would exercise or use in the conduct of his or her own affairs. Subject to this
provision, a Property Trustee is under no obligation to exercise any of the
powers given it by the applicable Declaration at the request of any holder of
preferred securities unless it is offered reasonable security or indemnity
against the costs, expenses and liabilities that it might incur. However, the
holders of the preferred securities will not be required to offer an indemnity
where the holders, by exercising their voting rights, direct the Property
Trustee to take any action following a Declaration Event of Default.

The Bank of New York is a participating lender under one of Occidental's
revolving credit agreements, provides commercial banking services to Occidental
and its affiliates and acts as property trustee, preferred securities guarantee
trustee and, through an affiliate, the Delaware trustee with respect to an issue
of preferred securities issued by an affiliate of Occidental. The Bank of New
York is the Senior Indenture Trustee and will act as the Subordinated Indenture
Trustee, the Property Trustee and the Preferred Securities Guarantee Trustee. In
addition, an affiliate of The Bank of New York will act as the Delaware Trustee
of each of the trusts. However, if The Bank of New York acquires any conflicting
interest when an event of default is pending, it must (with certain exceptions)
eliminate the conflict or resign.

                                       34
<PAGE>   36

MISCELLANEOUS

The Regular Trustees of each trust are authorized and directed to conduct the
affairs of and to operate each trust so that:

- - it will not be deemed to be an "investment company" required to be registered
  under the Investment Company Act;

- - it will be classified as a grantor trust for United States federal income tax
  purposes; and

- - the subordinated debt securities held by it will be treated as Occidental's
  indebtedness for United States federal income tax purposes.

Occidental and the Regular Trustees of a trust are authorized to take any action
(so long as it is consistent with applicable law or the applicable certificate
of trust or Declaration) that Occidental and the Regular Trustees of that trust
determine to be necessary or desirable for such purposes.

Holders of preferred securities have no preemptive or similar rights.

A trust may not borrow money, issue debt, execute mortgages or pledge any of its
assets.

GOVERNING LAW

Each Declaration and the related preferred securities will be governed by and
construed in accordance with the laws of the State of Delaware.

DESCRIPTION OF PREFERRED SECURITIES GUARANTEES

GENERAL

Occidental will execute a Preferred Securities Guarantee, which benefits the
holders of preferred securities, at the time that a trust issues those preferred
securities. Each Preferred Securities Guarantee will be qualified as an
indenture under the Trust Indenture Act. The Bank of New York will act as
indenture trustee ("Preferred Guarantee Trustee") under each Preferred
Securities Guarantee for the purposes of compliance with the Trust Indenture
Act. The Preferred Guarantee Trustee will hold each Preferred Securities
Guarantee for the benefit of the preferred securities holders of the applicable
trust.

Occidental will irrevocably agree, as described in each Preferred Securities
Guarantee, to pay in full, to the holders of the preferred securities issued by
the applicable trust, the Preferred Securities Guarantee Payments (as defined
below) (except to the extent previously paid), when and as due, regardless of
any defense, right of set-off or counterclaim which the trust may have or
assert. The following payments, to the extent not paid by a trust ("Preferred
Securities Guarantee Payments"), will be covered by the applicable Preferred
Securities Guarantee:

- - any accrued and unpaid distributions required to be paid on the applicable
  preferred securities, to the extent that the trust has funds available to make
  the payment;

- - the redemption price, to the extent that the trust has funds available to make
  the payment; and

- - upon a voluntary or involuntary dissolution and liquidation of the trust
  (other than in connection with a distribution of subordinated debt securities
  to holders of the preferred securities or the redemption of all such preferred
  securities), the lesser of:

  (1) the aggregate of the liquidation amount specified in the prospectus
      supplement for each preferred security plus all accrued and unpaid
      distributions on the preferred security to the date of payment, to the
      extent the trust has funds available to make the payment; and

  (2) the amount of assets of the trust remaining available for distribution to

                                       35
<PAGE>   37

      holders of its preferred securities upon a dissolution and liquidation of
      the trust ("Liquidation Payment").

Occidental's obligation to make a Preferred Securities Guarantee Payment may be
satisfied by directly paying the required amounts to the holders of the
preferred securities or by causing the trust to pay the amounts to the holders.

No single document relating to the issuance of preferred securities will provide
for Occidental's full, irrevocable and unconditional guarantee of the preferred
securities. Only the combined operation of Occidental's obligations under the
applicable Preferred Securities Guarantee, Declaration, Subordinated Indenture
and the subordinated debt securities has the effect of providing a full,
irrevocable and unconditional guarantee of a trust's obligations under its
preferred securities.

STATUS OF THE PREFERRED SECURITIES GUARANTEES

Each Preferred Securities Guarantee will be an unsecured obligation of
Occidental and will rank:

- - subordinate and junior in right of payment to all of Occidental's other
  liabilities (except for those liabilities made equal or junior by their terms
  to any of Occidental's liabilities under the applicable Preferred Securities
  Guarantee);

- - equal with any guarantee that Occidental has issued, or will issue, in respect
  of the most senior preferred or preference stock that Occidental issues now or
  hereafter and with any guarantee that Occidental issues now or hereafter in
  respect of any preferred or preference stock of any of its affiliates
  including Occidental's guarantee of the preferred securities of Oxy Capital
  Trust I, issued and sold on January 20, 1999; and

- - senior to Occidental's common stock.

Each Declaration will require that the holder of preferred securities accept the
subordination provisions and other terms of the Preferred Securities Guarantee.
Each Preferred Securities Guarantee will constitute a guarantee of payment and
not of collection (in other words the holder of the guaranteed security may sue
Occidental, or seek other remedies, to enforce its rights under the Preferred
Securities Guarantee without first suing any other person or entity). A
Preferred Securities Guarantee will not be discharged except by payment of the
Preferred Securities Guarantee Payments in full to the extent not previously
paid or upon distribution to the applicable preferred securities holders of the
corresponding series of subordinated debt securities pursuant to the appropriate
Declaration.

AMENDMENTS AND ASSIGNMENT

Except with respect to any changes which do not adversely affect the rights of
holders of a series of preferred securities in any material respect (in which
case no consent of any holders will be required), a Preferred Securities
Guarantee may be amended only with the prior approval of the holders of at least
a majority in aggregate liquidation amount of the applicable preferred
securities (excluding any preferred securities that Occidental or its affiliates
hold). A description of the way to obtain any approval is described under
"Description of the Preferred Securities -- Voting Rights; Amendment of
Declarations." All guarantees and agreements contained in a Preferred Securities
Guarantee will be binding on Occidental's successors, assigns, receivers,
trustees and representatives and are for the benefit of the holders of the
applicable preferred securities.

                                       36
<PAGE>   38

PREFERRED SECURITIES GUARANTEE EVENTS OF DEFAULT

An event of default under a Preferred Securities Guarantee occurs if Occidental
fails to make any of its required payments or perform its obligations under that
Preferred Securities Guarantee.

The holders of at least a majority in aggregate liquidation amount of the
preferred securities relating to each Preferred Securities Guarantee (excluding
any preferred securities that Occidental or any of its affiliates hold) will
have the right to direct the time, method and place of conducting any proceeding
for any remedy available to the Preferred Guarantee Trustee relating to the
applicable Preferred Securities Guarantee or to direct the exercise of any trust
or power given to the Preferred Guarantee Trustee under that Preferred
Securities Guarantee.

INFORMATION CONCERNING THE PREFERRED GUARANTEE TRUSTEES

The Preferred Guarantee Trustee under a Preferred Securities Guarantee, other
than during the occurrence and continuance of a default under that Preferred
Securities Guarantee, will perform only the duties that are specifically
described in that Preferred Securities Guarantee. After such a default, the
Preferred Guarantee Trustee will exercise the same degree of care and skill as a
prudent person would exercise or use in the conduct of his or her own affairs.
Subject to this provision, a Preferred Guarantee Trustee is under no obligation
to exercise any of its powers as described in the applicable Preferred
Securities Guarantee at the request of any holder of covered preferred
securities unless it is offered reasonable indemnity against the costs, expenses
and liabilities that it might incur.

TERMINATION OF THE PREFERRED SECURITIES GUARANTEES

Each Preferred Securities Guarantee will terminate once the applicable preferred
securities are paid in full or upon distribution of the corresponding series of
subordinated debt securities to the holders of those preferred securities. Each
Preferred Securities Guarantee will continue to be effective or will be
reinstated if at any time any holder of preferred securities issued by the
applicable trust must restore payment of any sums paid under those preferred
securities or such Preferred Securities Guarantee.

GOVERNING LAW

The Preferred Securities Guarantees will be governed by and construed in
accordance with the laws of the State of New York.

RELATIONSHIP AMONG PREFERRED SECURITIES, PREFERRED SECURITIES GUARANTEES AND
SUBORDINATED DEBT SECURITIES HELD BY EACH TRUST

Occidental will guarantee payments of distributions and redemption and
liquidation payments due on each series of preferred securities (to the extent
the applicable trust has funds available for the payments) to the extent
described under "Description of the Preferred Securities Guarantees." No single
document that Occidental executes in connection with the issuance of any series
of preferred securities will provide for its full, irrevocable and unconditional
guarantee of such preferred securities. Only the combined operation of
Occidental's obligations under the applicable Preferred Securities Guarantee,
Declaration, Subordinated Indenture and subordinated debt securities has the
effect of providing a full, irrevocable and unconditional guarantee of a trust's
obligations under its preferred securities.

                                       37
<PAGE>   39

As long as Occidental makes payments of interest and other payments when due on
the subordinated debt securities held by a trust, those payments will be
sufficient to cover the payment of distributions and redemption and liquidation
payments due on the preferred securities issued by that trust, primarily
because:

- - the aggregate principal amount of the subordinated debt securities will be
  equal to the sum of the aggregate liquidation amount of the preferred and
  common securities;

- - the interest rate and interest and other payment dates on the subordinated
  debt securities will match the distribution rate and distribution and other
  payment dates for the preferred securities;

- - Occidental shall pay for any and all costs, expenses and liabilities of each
  trust except the trust's obligations under its preferred securities (and
  Occidental has agreed to guarantee such payment); and

- - each Declaration provides that the related trust will not engage in any
  activity that is not consistent with the limited purposes of the trust.

If and to the extent that Occidental does not make payments on those
subordinated debt securities, the trust will not have funds available to make
payments of distributions or other amounts due on its preferred securities. In
those circumstances, you will not be able to rely upon the Preferred Securities
Guarantee for payment of these amounts. Instead, you may directly sue Occidental
or seek other remedies to collect your pro rata share of payments owed. If you
sue Occidental to collect payment, then Occidental will assume your rights as a
holder of preferred securities under such trust's Declaration to the extent
Occidental makes a payment to you in any legal action.

A holder of any preferred security may sue Occidental, or seek other remedies,
to enforce its rights under the applicable Preferred Securities Guarantee
without first suing the applicable Preferred Guarantee Trustee, the trust which
issued the preferred security or any other person or entity.

PLAN OF DISTRIBUTION

Occidental may sell the senior debt securities, subordinated debt securities,
shares of preferred stock or depositary shares and a trust may sell its
preferred securities being offered hereby in one or more of the following ways
from time to time:

- - to underwriters for resale to the public or to institutional investors;

- - directly to institutional investors;

- - directly to agents;

- - through agents to the public or to institutional investors; or

- - if indicated in the prospectus supplement, pursuant to delayed delivery
  contracts or by remarketing firms.

The prospectus supplements and pricing supplements, if any, will set forth the
terms of the offering of each series of securities, including the name or names
of any underwriters or agents, the purchase price of the securities and the
proceeds to Occidental or the applicable trust, as the case may be, from such
sale, any underwriting discounts or agency fees and other items constituting
underwriters' or agents' compensation, any initial public offering price, any
discounts or concessions allowed or reallowed or paid to dealers and any
securities exchanges on which the securities may be listed.

If underwriters are used in the sale, the securities will be acquired by the
underwriters for their own account and may be resold from time to time in one or
more transactions, including negotiated transactions, at a fixed

                                       38
<PAGE>   40

public offering price or prices, which may be changed, or at market or varying
prices determined at the time of sale.

Unless otherwise set forth in a prospectus supplement or a pricing supplement,
if any, the obligations of the underwriters to purchase any series of securities
will be subject to certain conditions precedent and the underwriters will be
obligated to purchase all of the series of securities, if any are purchased.

If a dealer is utilized in the sale of securities, Occidental will sell the
securities to the dealer, as principal. The dealer may then resell the
securities to the public at varying prices to be determined by the dealer at the
time of resale.

Securities may also be offered and sold, if so indicated in the prospectus
supplement or a pricing supplement, if any, in connection with a remarketing
upon their purchase, in accordance with a redemption or repayment pursuant to
their terms, or otherwise, by one or more firms ("remarketing firms") acting as
principals for their own accounts or as agents for Occidental. Any remarketing
firm will be identified and the terms of its agreement, if any, with Occidental
and its compensation will be described in the prospectus supplement or a pricing
supplement, if any.

Underwriters, agents, dealers and remarketing firms may be entitled under
agreements entered into with Occidental and/or a trust to indemnification by
Occidental and/or such trust against certain civil liabilities, including
liabilities under the Securities Act of 1933, or to contribution with respect to
payments which the underwriters or agents may be required to make in respect
thereof. Underwriters, agents, dealers and remarketing firms may be customers
of, engage in transactions with, or perform services for Occidental and its
affiliates in the ordinary course of business.

Each series of securities will be a new issue of securities and will have no
established trading market. Any underwriters to whom Occidental or any trust
sells securities for public offering and sale may make a market in the
securities, but such underwriters will not be obligated to do so and may
discontinue any market making at any time without notice. The securities may or
may not be listed on a national securities exchange or a foreign securities
exchange.

LEGAL OPINIONS

The validity of the senior debt securities, the subordinated debt securities,
the preferred stock, the depositary shares, the preferred securities, the
preferred securities guarantees and certain matters relating thereto will be
passed on for Occidental by Robert E. Sawyer, Esq., Associate General Counsel of
Occidental, and by Skadden, Arps, Slate, Meagher & Flom LLP, Los Angeles,
California, and for any underwriters by Brown & Wood LLP, Los Angeles,
California. Mr. Sawyer beneficially owns, and has rights to acquire under
employee stock options, an aggregate of less than 1 percent of the outstanding
common stock of Occidental.

EXPERTS

The consolidated financial statements and financial statement schedule of
Occidental and its subsidiaries, for the fiscal year ended December 31, 1998,
included in Occidental's Annual Report on Form 10-K for the fiscal year ended
December 31, 1998, which are incorporated by reference in this prospectus, have
been audited by Arthur Andersen LLP, independent public accountants, as
indicated in their reports with respect thereto, and are incorporated by
reference herein in reliance upon the authority of said firm as experts in
accounting and auditing in giving said reports.

                                       39
<PAGE>   41

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

The following table sets forth estimates (other than the SEC filing fee) of the
expenses to be borne by Occidental in connection with the offerings described in
this Registration Statement.

<TABLE>
<S>                                                           <C>
SEC filing fee..............................................  $  278,000
Printing fees and expenses..................................      25,000
Accounting fees and expenses................................      10,000
Rating agency fees..........................................     898,000
Legal fees and expenses.....................................      50,000
Trustee fees and expenses...................................      47,000
Blue sky fees and expenses..................................      10,000
Miscellaneous...............................................      32,000
                                                              ----------
          Total.............................................  $1,350,000
                                                              ==========
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

Section 145 of the Delaware General Corporation Law (DGCL) permits the Board of
Directors of Occidental to indemnify any person against expenses (including
attorneys' fees), judgments, fines and amount paid in settlement actually and
reasonably incurred by him or her in connection with any threatened, pending or
completed action, suit or proceeding in which such person is made a party by
reason of his or her being or having been a director, officer, employee or agent
of Occidental, as the case may be, in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended (the Securities Act). The statute provides that indemnification
pursuant to its provisions is not exclusive of other rights of indemnification
to which a person may be entitled under any bylaw, agreement, vote of
stockholders or disinterested directors, or otherwise.

Occidental's Restated Certificate of Incorporation, as amended, provides for the
indemnification of its directors and officers to the fullest extent permitted by
the DGCL. Occidental has also entered into indemnification agreements with each
director and certain officers providing for additional indemnification.
Additionally, Article VIII of Occidental's By-laws provides that Occidental
shall indemnify directors and officers under certain circumstances for
liabilities and expenses incurred by reason of their activities in such
capacities. In addition, Occidental has insurance policies that provide
liability coverage to directors and officers while acting in such capacities.

The Declaration of Trust of each trust provides that no Regular Trustee,
affiliate of any Regular Trustee, or any officers, directors, shareholders,
members, partners, employees, representatives or agents of any Regular Trustee,
or any employee or agent of such trust or its affiliates (each, an Indemnified
Person) shall be liable, responsible or accountable in damages or otherwise to
such trust or any employee or agent of the trust or its affiliates for any loss,
damage or claim incurred by reason of any act or omission performed or omitted
by such Indemnified Person in good faith on behalf of such trust and in a manner
such Indemnified Person reasonably believed to be within the scope of the
authority conferred on such Indemnified Person by such Declaration or by law,
except that an Indemnified Person shall be liable for any such loss, damage or
claim
                                      II-1
<PAGE>   42

incurred by reason of such Indemnified Person's gross negligence or willful
misconduct with respect to such acts or omissions.

The Declaration of Trust of each trust also provides that to the fullest extent
permitted by applicable law, Occidental shall indemnify and hold harmless each
Indemnified Person from and against any loss, damage or claim incurred by such
Indemnified Person by reason of any act or omission performed or omitted by such
Indemnified Person in good faith on behalf of such trust and in a manner such
Indemnified Person reasonably believed to be within the scope of authority
conferred on such Indemnified Person by such Declaration, except that no
Indemnified Person shall be entitled to be indemnified in respect of any loss,
damage or claim incurred by such Indemnified Person by reason of gross
negligence or willful misconduct with respect to such act or omissions. The
Declaration of each trust further provides that, to the fullest extent permitted
by applicable law, expenses (including legal fees) incurred by an Indemnified
Person in defending any claim, demand, action, suit or proceeding shall, from
time to time, be advanced by Occidental prior to the final disposition of such
claim, demand, action, suit or proceeding upon receipt by of an undertaking by
or on behalf of the Indemnified Person to repay such amount if it shall be
determined that the Indemnified Person is not entitled to be indemnified for the
underlying cause of action as authorized by such Declaration.

The directors and officers of Occidental and the Regular Trustees of each trust
are covered by insurance policies indemnifying against certain liabilities,
including certain liabilities arising under the Securities Act, which might be
incurred by them in such capacities.

ITEM 16.  EXHIBITS.

<TABLE>
<C>   <S>
 1.1  Form of Underwriting Agreement (Preferred Securities).**
 1.2  Form of Underwriting Agreement (Debt Securities)
      (incorporated by reference from Exhibit 1.1 to Occidental's
      Registration Statement on Form S-3 (File No. 333-52053)
      filed with the Commission on May 7, 1998).
 1.3  Form of Distribution Agreement (Debt Securities).**
 3.1  Certificate of Trust of Oxy Capital Trust II (incorporated
      by reference from Exhibit 3.2 to Occidental's Registration
      Statement on Form S-3 (File No. 333-69303), filed with the
      Commission on December 21, 1998).
 3.2  Certificate of Trust of Oxy Capital Trust III (incorporated
      by reference from Exhibit 3.3 to Occidental's Registration
      Statement on Form S-3 (File No. 333-69303), filed with the
      Commission on December 21, 1998).
 4.1  Certificate of Amendment of Restated Certificate of
      Incorporation of Occidental dated April 30, 1999
      (incorporated by reference from Exhibit 3.(i)(c) to the
      Registration Statement on Form S-8 of Occidental, File No.
      333-78031, filed with the Commission on May 7, 1999).
 4.2  By-laws of Occidental, as amended through April 30, 1999
      (incorporated by reference from Exhibit 3.(ii) to the
      Registration Statement on Form S-8 of Occidental, File No.
      333-78031, filed with the Commission on May 7, 1999).
 4.3  Declaration of Trust of Oxy Capital Trust II (incorporated
      by reference from Exhibit 4.2 to Occidental's Amendment No.
      1 to Registration Statement on Form S-3 (File No.
      333-69303), filed with the Commission on January 6, 1999).
 4.4  Declaration of Trust of Oxy Capital Trust III (incorporated
      by reference from Exhibit 4.3 to Occidental's Amendment No.
      1 to Registration Statement on Form S-3 (File No.
      333-69303), filed with the Commission on January 6, 1999).
</TABLE>

                                      II-2
<PAGE>   43

<TABLE>
<C>   <S>
 4.5  Form of Amended and Restated Declaration of Trust for each
      of Oxy Capital Trust II and Oxy Capital Trust III
      (incorporated by reference from Exhibit 4.4 to Occidental's
      Amendment No. 1 to Registration Statement on Form S-3 (File
      No. 333-69303), filed with the Commission on January 6,
      1999).
 4.6  Indenture (Senior Debt Securities), dated as of April 1,
      1998, between Occidental and The Bank of New York, as
      Trustee (incorporated by reference from Exhibit 4 to
      Occidental's Registration Statement on Form S-3 (File No.
      333-52053), filed with the Commission on May 7, 1998).
 4.7  Indenture (Subordinated Debt Securities) (incorporated by
      reference from Exhibit 4.2 to Occidental's Current Report on
      Form 8-K, filed with the Commission on January 20, 1999).
 4.8  Form of Preferred Security (included in Exhibit 4.5).
 4.9  Form of Preferred Securities Guarantee (incorporated by
      reference from Exhibit 4.8 to Occidental's Amendment No. 1
      to Registration Statement on Form S-3 (File No. 333-69303),
      filed with the Commission on January 6, 1999).
4.10  Form of Deposit Agreement.**
 5.1  Opinion of Robert E. Sawyer, Esq.
 5.2  Opinion of Skadden, Arps, Slate, Meagher & Flom LLP.
12.1  Statement regarding the computation of total enterprise
      ratios of earnings to fixed charges and earnings to combined
      fixed charges and preferred stock dividends.*
23.1  Consent of Robert E. Sawyer, Esq. (included in Exhibit 5.1).
23.2  Consent of Skadden, Arps, Slate, Meagher & Flom LLP
      (included in Exhibit 5.2).
23.3  Consent of Independent Public Accountants (Arthur Andersen
      LLP).*
24.1  Powers of Attorney (included on pages II-5 through II-8 ).*
25.1  Statement of Eligibility on Form T-I under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Trustee under the Indenture (Senior Debt Securities).*
25.2  Statement of Eligibility on Form T-I under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Trustee under the Indenture (Subordinated Debt
      Securities).*
25.3  Statement of Eligibility on Form T-1 under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Property Trustee -- Oxy Capital Trust II.*
25.4  Statement of Eligibility on Form T-I under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Property Trustee-Oxy Capital Trust III.*
25.5  Statement of Eligibility on Form T-1 under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Trustee under the Preferred Securities Guarantee -- Oxy
      Capital Trust II.*
25.6  Statement of Eligibility on Form T-1 under the Trust
      Indenture Act of 1939, as amended, of The Bank of New York,
      as Trustee under the Preferred Securities Guarantee -- Oxy
      Capital Trust III.*
</TABLE>


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

 * Previously filed.


** To be filed by amendment or as an exhibit to a document to be incorporated or
   deemed to be incorporated by reference in the Registration Statement.

ITEM 17.  UNDERTAKINGS.

(a) The undersigned registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement to include
     any material information with respect to the plan of distribution not
     previously disclosed in the registration statement or any material change
     to such information in the registration statement.

          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement

                                      II-3
<PAGE>   44

     relating to the securities offered therein, and the offering of such
     securities at that time shall be deemed to be the initial bona fide
     offering thereof.

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

(b) The undersigned registrant hereby undertakes that, for the purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

(c) Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

(d) Oxy Capital Trust II and Oxy Capital Trust III each hereby undertakes to
provide to the underwriter at the closing specified in the underwriting
agreements, certificates in such denominations and registered in such names as
required by the underwriter to permit prompt delivery to each purchaser.

                                      II-4
<PAGE>   45


                                   SIGNATURES



Pursuant to the requirements of the Securities Act of 1933, Occidental Petroleum
Corporation certifies that it has reasonable grounds to believe that it meets
all the requirements for filing on Form S-3 and has duly caused this Amendment
No. 1 to Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Los Angeles, State of California, on
June 9, 1999.


                                          OCCIDENTAL PETROLEUM CORPORATION


                                          By:    /s/ DONALD P. DE BRIER

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

                                                     Donald P. de Brier


                                                 Executive Vice President,


                                               General Counsel and Corporate
                                                          Secretary



Pursuant to the requirements of the Securities Act, this Amendment No. 1 to
Registration Statement has been signed by the following persons in the
capacities indicated on June 9, 1999.



<TABLE>
<CAPTION>
                     SIGNATURE                                              TITLE
                     ---------                                              -----
<C>                                                    <S>

                         *                             Chairman of the Board of Directors and Chief
- ---------------------------------------------------    Executive Officer
                   Ray R. Irani

                         *                             Chief Financial Officer and Executive Vice
- ---------------------------------------------------    President
                 Stephen I. Chazen

                         *                             Vice President and Controller (Chief Accounting
- ---------------------------------------------------    Officer)
              Samuel P. Dominick, Jr.

                                                                          Director
- ---------------------------------------------------
                 Ronald W. Burkle

                         *                                                Director
- ---------------------------------------------------
                  John S. Chalsty

                         *                                                Director
- ---------------------------------------------------
                Edward P. Djerejian

                         *                                                Director
- ---------------------------------------------------
                   John E. Feick

                         *                                                Director
- ---------------------------------------------------
                   J. Roger Hirl

                                                                          Director
- ---------------------------------------------------
                   John W. Kluge

                         *                                                Director
- ---------------------------------------------------
                 Dale R. Laurance

                         *                                                Director
- ---------------------------------------------------
                 Irvin W. Maloney
</TABLE>


                                      II-5
<PAGE>   46


<TABLE>
<CAPTION>
                     SIGNATURE                                              TITLE
                     ---------                                              -----
<C>                                                    <S>
                         *                                                Director
- ---------------------------------------------------
                  Rudolfo Segovia

                         *                                                Director
- ---------------------------------------------------
                  Aziz D. Syriani

                         *                                                Director
- ---------------------------------------------------
                  Rosemary Tomich
</TABLE>



*By:   /s/ DONALD P. DE BRIER

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

           Donald P. de Brier


            Attorney-in-Fact


                                      II-6
<PAGE>   47


                                   SIGNATURES



Pursuant to the requirements of the Securities Act of 1933, Oxy Capital Trust II
certifies that it has reasonable grounds to believe that it meets all the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Los Angeles, State of California, on June 9,
1999.


                                          OXY CAPITAL TRUST II

                                          By:       /s/ J. R. HAVERT
                                            ------------------------------------
                                              J. R. Havert, Regular Trustee

                                          By:
                                            ------------------------------------
                                              A. R. Leach, Regular Trustee

                                          By:      /s/ JOHN R. ZAYLOR
                                            ------------------------------------

                                              John R. Zaylor, Regular Trustee




                                      II-7
<PAGE>   48


                                   SIGNATURES



Pursuant to the requirements of the Securities Act of 1933, Oxy Capital Trust
III certifies that it has reasonable grounds to believe that it meets all the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Los Angeles, State of California, on June 9,
1999.


                                          OXY CAPITAL TRUST III

                                          By:       /s/ J. R. HAVERT
                                            ------------------------------------
                                              J. R. Havert, Regular Trustee

                                          By:
                                            ------------------------------------
                                              A. R. Leach, Regular Trustee

                                          By:      /s/ JOHN R. ZAYLOR
                                            ------------------------------------

                                              John R. Zaylor, Regular Trustee




                                      II-8

<PAGE>   1
                                                                     EXHIBIT 5.1



                                  June 9, 1999


Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, California  90024

               Re:    Registration Statement on Form S-3 of
                      Occidental Petroleum Corporation, Oxy
                      Capital Trust II and Oxy Capital Trust III
                      ------------------------------------------


Ladies and Gentlemen:

        I am an Associate General Counsel of Occidental Petroleum Corporation, a
Delaware corporation ("Occidental"), and am rendering this opinion in connection
with the preparation of the above-referenced Registration Statement on Form S-3
(No. 333- 79541) (the "Registration Statement"), which was filed by Occidental
and Oxy Capital Trust II and Oxy Capital Trust III, each a statutory business
trust created under the Business Trust Act of the State of Delaware (each a
"Trust," and collectively, the "Trusts"), on May 28, 1999, with the Securities
and Exchange Commission (the "Commission"). The Registration Statement relates
to the registration under the Securities Act of 1933, as amended (the
"Securities Act"), of $1,000,000,000 aggregate public offering price of (i)
Occidental's (a) senior unsecured debt securities (the "Senior Debt
Securities"), which may be issued pursuant to an indenture, dated as of April 1,
1998, between Occidental and The Bank of New York, a New York banking corpora-
tion, as trustee (as amended or supplemented, the "Senior Indenture"); (b)
subordinated debt securities (the "Subordinated Debt Securities" and, together
with the Senior Debt Securities, the "Debt Securities"), which may be issued
pursuant to an indenture, dated as of January 20, 1999, between Occidental and
The Bank of New York, a New York banking corporation, as trustee (as amended or
supplemented, the "Subordinated Indenture"); (c) shares of preferred stock, par
value $1.00 per share, of Occidental


<PAGE>   2
Occidental Petroleum Corporation
June 9, 1999
Page 2



(the "Preferred Stock"), which may be represented by depositary shares (the
"Depositary Shares") evidenced by depositary receipts (the "Receipts"), which
may be issued under deposit agreements (the "Deposit Agreements") to be entered
into by the Company in respect of the Depositary Shares; and (d) guarantees by
Occidental of the preferred securities (the "Guarantees") described below
pursuant to one or more guarantee agreements (each a "Guarantee Agreement") to
be entered into by Occidental; and (ii) preferred securities (the "Preferred
Securities" and, together with the Debt Securities, the Preferred Stock, the
Guarantees and the Depositary Shares, the "Offered Securities") which may be
issued by each Trust pursuant to their respective Amended and Restated
Declarations of Trust (each an "Amended Declaration"). The Offered Securities
are being registered for offering and sale from time to time pursuant to Rule
415 under the Securities Act.

        This opinion is delivered in accordance  with the  requirements  of Item
601(b)(5) of Regulation S-K under the Securities Act.

        In connection with this opinion, I have examined and am familiar with
originals or copies, certified or otherwise identified to my satisfaction, of
such documents as I have deemed necessary or appropriate as a basis for the
opinions set forth herein, including (i) the Registration Statement (together
with the form of preliminary prospectus forming a part thereof); (ii) the
Restated Certificate of Incorporation and ByLaws of Occidental, in each case, as
amended to date (the "Certificate" and "By-Laws", respectively; (iii) the Senior
Indenture; (iv) the Subordinated Indenture; (v) the form of Preferred Securities
Guarantee Agreement; (vi) the Certificate of Trust of each of the Trusts filed
with the Secretary of State of the State of Delaware on December 16, 1998 (each,
a "Certificate of Trust"); (vii) the Declaration of Trust of each of the Trusts
dated as of December 16, 1998 (each, a "Declaration of Trust"); and (viii)
copies of certain resolutions adopted by the Board of Directors of Occidental
relating to the execution of the Senior Indenture and the Subordinated
Indenture, the issuance of the Offered Securities, the filing of the
Registration Statement and any amendments or supplements thereto and related
matters (the "Board Resolutions").

        I am familiar with the proceedings taken and proposed to be taken by
Occidental in connection with the authorization and issuance of the Offered
Securities and, for the purposes of this opinion, have assumed such proceedings
will be timely completed in the manner presently proposed and that the terms of
each issuance will otherwise be in compliance with law. In my examination, I
have


<PAGE>   3
Occidental Petroleum Corporation
June 9, 1999
Page 3



assumed the legal capacity of all natural persons, that the signatures
(other than signatures executing documents on behalf of Occidental) on all
documents examined or caused to be examined by me are genuine, that all
documents submitted to me as originals are authentic, and that all documents
submitted to me as copies conform with the originals, which assumptions I have
not independently verified. As to any facts material to the opinions expressed
herein which I have not independently established or verified, I have relied
upon statements and representations of officers and other representatives of
Occidental and others.

        I am a member of the California and New York Bars and for purposes of
this opinion do not hold myself out as an expert on, nor do I express any
opinion as to, the laws of any jurisdiction other than the laws of the State of
New York, the Federal laws of the United States and the General Corporation Law
of the State of Delaware (the "DGCL"). The Offered Securities may be issued from
time to time on a delayed or continuous basis and this opinion is limited to the
laws, including the rules and regulations, as in effect on the date hereof.

        Based upon and subject to the foregoing, I am of the opinion that:

               1. With respect to any series of Debt Securities, when (i) the
Registration Statement becomes effective under the Securities Act; (ii) the
appropriate officers of Occidental have taken all necessary action pursuant to
the provisions of the Senior Indenture or the Subordinated Indenture, as the
case may be, to fix and approve the terms of the Debt Securities, including the
establishment of the form or forms of certificates representing the Debt
Securities pursuant to the provisions of the Senior Indenture or the
Subordinated Indenture, as the case may be; (iii) the Senior Indenture or the
Subordinated Indenture, as the case may be, shall have been qualified under the
Trust Indenture Act of 1939, as amended; and (iv) the Debt Securities are duly
executed and authenticated in accordance with the provisions of the Senior
Indenture or the Subordinated Indenture, as the case may be, and duly delivered
to the purchasers thereof upon payment of the agreed upon consideration
therefor, the Debt Securities will be validly issued and binding obligations of
Occidental, enforceable against Occidental in accordance with their terms,
except as may be subject to or limited by (a) bankruptcy, insolvency,
reorganization, moratorium or other similar laws now or hereafter in effect
affecting creditors' rights generally, (b) the effect of general principles of
equity, including, without limitation, concepts of materiality, reasonableness,
good faith and fair dealing and the possible unavailability of specific
performance or injunctive relief,


<PAGE>   4
Occidental Petroleum Corporation
June 9, 1999
Page 4



regardless of whether considered in a proceeding in equity or at law, (c)
requirements that a claim with respect to any Debt Securities authenticated and
delivered under the applicable Indenture denominated other than in United States
dollars (or a judgment denominated other than in United States dollars in
respect of such claim) be converted into United States dollars at a rate of
exchange prevailing on a date determined pursuant to applicable law, and (d)
governmental authority to limit, delay or prohibit the making of payments
outside the United States or in a foreign currency, composite currency or
currency unit. In addition, I express no opinion with respect to any Debt
Securities that are indexed or linked to any foreign currency, composite
currency, currency unit, commodity, equity index or similar index.

               2. With respect to any series of Preferred Stock, when (i) the
Registration Statement becomes effective under the Securities Act; (ii) the
appropriate officers of Occidental have taken all necessary corporate action to
fix and approve the terms of the Preferred Stock in accordance with the Board
Resolutions, including the adoption of a Certificate of Designation for the
Preferred Stock in the form required by applicable law; (iii) such Certificate
of Designation has been duly filed with the Secretary of State of the State of
Delaware; (iv) certificates representing the shares of the Preferred Stock have
been manually signed by an authorized officer of the transfer agent and
registrar for the Preferred Stock and registered by such transfer agent and
registrar, and delivered to the purchasers thereof; and (v) Occidental receives
consideration per share for the Preferred Stock in such amount as may be
determined by the Board of Directors of Occidental, or an authorized committee
thereof, in a form legally valid under the DGCL, the issuance and sale of the
shares of Preferred Stock will have been duly authorized, and such shares will
be validly issued, fully paid and nonassessable.

               3. With respect to Depositary Shares representing fractional
interests in any series of Preferred Stock, when (i) the Registration Statement
becomes effective under the Securities Act; (ii) the Board of Directors of
Occidental or an authorized committee thereof has taken all necessary corporate
action to fix and determine the specific terms of the particular issuance of the
Depositary Shares and the related series of Preferred Stock in accordance with
the Board Resolutions, including the adoption of a Certificate of Designation
for such related series of Preferred Stock in the form required by applicable
law; (iii) such Certificate of Designation has been duly filed with the
Secretary of State of the State of Delaware; (iv) the terms of the Depositary
Shares and of their issuance and sale have been duly established in conformity
with the Deposit Agreement and applicable law; (v) the


<PAGE>   5

Occidental Petroleum Corporation
June 9, 1999
Page 5



applicable Deposit Agreement has been duly executed and delivered and is in
conformity with the Board Resolutions; (vi) the related shares of Preferred
Stock have been duly authorized and validly issued in accordance with the laws
of the State of Delaware and delivered to the depositary for deposit in
accordance with the Deposit Agreement; and (vii) the Receipts, in the form
contemplated and authorized by the Deposit Agreement, evidencing the Depositary
Shares, have been duly issued against deposit of the related shares of Preferred
Stock with the depositary in accordance with the Deposit Agreement, and paid for
by the purchasers thereof in the manner contemplated by the Registration
Statement and/or the applicable prospectus supplement, the issuance and sale of
the Depositary Shares will have been duly authorized, and such shares will be
validly issued and the Receipts will entitle the holders thereof to the rights
specified therein and in the Deposit Agreement.

               4. With respect to the Guarantees, when (i) the trustees of the
applicable Trust have taken all necessary action to adopt the Amended
Declaration and to fix and determine the terms of the applicable Preferred
Securities in accordance with the terms of the applicable Amended Declaration;
(ii) the appropriate officers of Occidental have taken all necessary action to
fix and determine the terms of the applicable Guarantees in accordance with the
Board Resolutions; (iii) the terms of the applicable Preferred Securities and
the related Guarantee and the issuance and sale thereof have been duly
established in conformity with the applicable Amended Declaration and applicable
Guarantee Agreement, respectively, so as not to violate any applicable law, the
applicable Certificate of Trust, Declaration of Trust and Amended Declaration,
and the Restated Certificate of Incorporation and By-Laws of Occidental, or
result in a default (with the passage of time or otherwise) under or a breach of
any contract, indenture, mortgage, loan agreement, note, lease or other
instrument binding upon the Trust or Occidental, and so as to comply with any
requirement or restriction imposed by any court or governmental agency or
authority having jurisdiction over the applicable Trust or Occidental; (iv) the
applicable Guarantee Agreement has been duly executed and delivered; (v) the
applicable Preferred Securities have been duly issued and delivered by the
applicable Trust as contemplated by the Registration Statement and the
prospectus supplement relating thereto; (vi) certificates representing the
applicable Preferred Securities have been manually authenticated by an
authorized officer of the Property Trustee (as defined in the applicable Amended
Declaration) for the applicable Preferred Securities and registered by such
Property Trustee and delivered to the purchasers thereof; (vii) the applicable
Trust receives the agreed-upon consideration therefor; and (viii) the applicable
Guarantee Agreement shall have


<PAGE>   6

Occidental Petroleum Corporation
June 9, 1999
Page 6



been qualified under the Trust Indenture Act of 1939, as amended, the applicable
Guarantee will be a valid and binding obligation of Occidental enforceable in
accordance with its terms except as may be subject to or limited by (a)
bankruptcy, insolvency, reorganization, moratorium or other similar laws now or
hereafter in effect affecting creditors' rights generally, (b) the effect of
general principles of equity, including, without limitation, concepts of
materiality, reasonableness, good faith and fair dealing and the possible
unavailability of specific performance or injunctive relief, regardless of
whether considered in a proceeding in equity or at law, (c) requirements that a
claim with respect to any Guarantee denominated other than in United States
dollars (or a judgment denominated other than in United States dollars in
respect of such claim) be converted into United States dollars at a rate of
exchange prevailing on a date determined pursuant to applicable law, (d)
governmental authority to limit, delay or prohibit the making of payments
outside the United States or in a foreign currency, composite currency or
currency unit, and (e) the effect of general rules of contract law that limit
the enforceability of provisions requiring indemnification of a party for
liability for its own action or inaction to the extent the action or inaction
involves gross negligence, recklessness, willful misconduct or unlawful conduct.

        The  opinions  above  with  respect to the Debt  Securities,  Depositary
Shares and Guarantees are limited to the internal laws of the State of New York.
The opinion above with respect to the Guarantees is subject to the qualification
that certain of the  guarantee  and surety  waivers  contained in the  Guarantee
Agreements may be  unenforceable  in whole or in part, but the inclusion of such
provisions  does not affect the  validity or  enforceability  of any  Guarantee,
taken as a whole.

        I call to your attention that federal courts located in New York could
decline to hear a case on grounds of forum non-conveniens or any doctrine
limiting the availability of the federal courts in New York as a forum for the
resolution of disputes not having a sufficient nexus to New York and I express
no opinion as to any waiver of rights to assert the applicability of the forum
non-conveniens doctrine or any such other doctrine.

        My opinion above with respect to the enforceability of the choice of New
York law and choice of New York forum provisions of the Indentures, Debt
Securities, Deposit Agreement and Guarantees is rendered in reliance upon the
Act of July 19, 1984, ch. 421, 1984 McKinney's Sess. Law of N.Y. 1406 (codified
at N.Y. Gen. Oblig. Law Sections 5-1401, 5-1402 (McKinney 1989) and N.Y. CPLR
327(b) (McKinney (1990)) (the "Act") and is subject to the qualifications that
such


<PAGE>   7
Occidental Petroleum Corporation
June 9, 1999
Page 7



enforceability (i) may be limited by public policy considerations of any
jurisdiction, other than the courts of the State of New York, in which
enforcement of such provisions, or of a judgment upon an agreement containing
such provisions, is sought, and (ii) as specified in the Act, does not apply to
the extent provided to the contrary in subsection two of Section 1-105 of the
New York Uniform Commercial Code.

<PAGE>   8
Occidental Petroleum Corporation
June 9, 1999
Page 8

        I hereby  consent to the filing of this opinion with the  Commission  as
Exhibit 5.1 to the Registration  Statement and to the incorporation by reference
of this opinion into any registration  statement of Occidental filed pursuant to
Rule 462(b) of the  Securities  Act. I also consent to the reference to me under
the heading  "Legal  Opinions"  in the  Registration  Statement.  In giving this
consent,  I do not  thereby  admit that I am in the  category  of persons  whose
consent  is  required  under  Section 7 of the  Securities  Act or the rules and
regulations of the Commission.

                                Very truly yours,

                                /s/ ROBERT E. SAWYER

<PAGE>   1
                                                                     EXHIBIT 5.2


                           [SKADDEN ARPS LETTERHEAD]


                                  June 9, 1999


Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, CA  90024

Ladies and Gentlemen:

               We have acted as special counsel to Occidental Petroleum
Corporation, a Delaware corporation (the "Company"), and Oxy Capital Trust II
and Oxy Capital Trust III, each a statutory business trust created under the
Business Trust Act of the State of Delaware (each a "Trust," and together, the
"Trusts"), in connection with the preparation of the Registration Statement on
Form S-3 (No. 333-79541) (the "Registration Statement") filed by the Company
and the Trusts with the Securities and Exchange Commission (the "Commission") on
May 28, 1999 with respect to the registration under the Securities Act of 1933,
as amended (the "Act"), of $1,000,000,000 aggregate public offering price of (i)
the Company's (a) unsecured senior debt securities (the "Senior Debt
Securities"), which may be issued pursuant to an indenture, dated as of April 1,
1998, between the Company and The Bank of New York, a New York banking
corporation, as Trustee (as amended or supplemented, the "Senior Indenture");
(b) subordinated debt securities (the "Subordinated Debt Securities" and,
together with the Senior Debt Securities, the "Debt Securities"), which may be
issued pursuant to an indenture, dated as of January 20, 1999, between the
Company and The Bank of New York, a New York banking corporation, as trustee (as
amended or supplemented, the "Subordinated Indenture"); and (c)


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guarantees by the Company of the Preferred Securities described below (the
"Guarantees" and, together with the Debt Securities, the "Company Securities")
which may be issued under one or more guarantee agreements which may be entered
into by the Company; (ii) preferred securities (the "Preferred Securities") of
the Trusts which may be issued by one or both of the Trusts pursuant to its
Amended and Restated Declaration of Trust (each an "Amended Declaration"); and
(iii) certain other securities of the Company.

               This opinion is being furnished in accordance with the
requirements of Item 601(b)(5) of Regulation S-K under the Act.

               In connection with this opinion, we have examined originals or
copies, certified or otherwise identified to our satisfaction, of (i) the
Registration Statement; (ii) the Certificate of Trust of each of the Trusts
filed with the Secretary of State of the State of Delaware on December 16, 1998;
(iii) the form of Amended Declaration of each Trust filed as an exhibit to the
Registration Statement; and (iv) the form of the Preferred Security filed as an
exhibit to the Registration Statement. We have also examined originals or
copies, certified or otherwise identified to our satisfaction, of such other
documents, certificates and records as we have deemed necessary or appropriate
as a basis for the opinions set forth herein.

               In our examination, we have assumed the legal capacity of all
natural persons, the genuineness of all signatures, the authenticity of all
documents submitted to us as originals, the conformity to original documents of
all documents submitted to us as certified, conformed or photostatic copies and
the authenticity of the originals of such copies. In making our examination of
executed documents or documents to be executed by parties other than the Trusts,
we have assumed that such parties had the power, corporate or other, to enter
into and perform all obligations thereunder and have also assumed the due
authorization by all requisite action, corporate or other, and execution and
delivery by such parties of such documents and the validity and binding effect
thereof on such parties.

               In expressing the opinions contained herein, we have assumed with
your permission that the execution and delivery by the Trusts, as applicable, of
the Preferred Securities, the consummation of the transactions contemplated by
the Registration Statement and the performance by each of the Trusts of their
respective obligations under the Preferred Securities, as applicable, do not and
will not violate,


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Occidental Petroleum Corporation
June 9, 1999
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conflict with or constitute a breach of or a default (with the passage of time
or otherwise) under (i) any contract, indenture, mortgage, loan agreement, note,
lease or other instrument to which either Trust may be bound or to which any of
its properties may be subject, (ii) any provision of any statute, law, rule, or
regulation to which either Trust may be subject, (iii) any order or decree of
any court, governmental agency or authority entered in any proceeding to which
either Trust was or is now a party or by which it is bound or (iv) any consent,
approval, license, authorization or validation of, or filing, recording or
registration with, any governmental authority. As to any facts material to the
opinions expressed herein which we have not independently established or
verified, we have relied upon oral or written statements and representations of
officers and other representatives of the Company, each of the Trusts and
others.

               Members of our firm are admitted to the bar in the State of
Delaware and we do not express any opinion as to the laws of any other
jurisdiction.

               Based upon and subject to the foregoing we are of the opinion
that:

               1. With respect to the Preferred Securities (the "Offered
Preferred Securities"), when (i) the trustees of the applicable Trust have taken
all necessary action to adopt the Amended Declaration and to fix and determine
the terms of the Offered Preferred Securities in accordance with the Amended
Declaration; (ii) the terms of the Offered Preferred Securities and of their
issuance and sale have been duly established in conformity with the Amended
Declaration so as not to violate any applicable law; and (iii) the Offered
Preferred Securities have been duly issued and delivered by the applicable Trust
and paid for by the purchaser thereof as contemplated by the Registration
Statement and the prospectus supplement relating thereto, the issuance and sale
of the Offered Preferred Securities will have been duly authorized for issuance
and, subject to the limitations set forth in paragraph 2 below, will represent
fully-paid, nonassessable and undivided beneficial interests in the assets of
the applicable Trust.

               2. The holders of the Offered Preferred Securities will be
entitled to the same limitation of personal liability extended to stockholders
of private corporations for profit organized under the Delaware General
Corporation Law. We bring to your attention, however, that the holders of the
Offered Preferred Securities of each Trust may be obligated, pursuant to the
Amended Declaration of such Trust,


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Occidental Petroleum Corporation
June 9, 1999
Page 4



to (i) provide indemnity and/or security in connection with, and pay taxes or
governmental charges arising from, transfers of Offered Preferred Securities and
the issuance of replacement Offered Preferred Securities and (ii) provide
security and indemnity in connection with requests of, or directions to, the
Property Trustee (as defined in the applicable Amended Declaration) to exercise
its rights and powers under the applicable Amended Declaration.

               We hereby consent to the filing of this opinion with the
Commission as an exhibit to the Registration Statement. We also consent to the
reference to our firm under the caption "Legal Opinions" in the Registration
Statement. In giving this consent, we do not thereby admit that we are included
in the category of persons whose consent is required under Section 7 of the Act
or the rules and regulations of the Commission. This opinion is expressed as of
the date hereof, and we disclaim any undertaking to advise you of any subsequent
changes in the facts stated or assumed herein or of any subsequent changes in
applicable law.

                                Very truly yours,




                                Skadden, Arps, Slate, Meagher & Flom


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