Document:

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                                                                     EXHIBIT 4.1

                         ANADARKO PETROLEUM CORPORATION

                              OFFICERS' CERTIFICATE

                  We, Albert L. Richey and Suzanne Suter, Vice President and
Treasurer, and Corporate Secretary, respectively, of Anadarko Petroleum
Corporation, a Delaware corporation (the "Company"), hereby certify, pursuant to
Sections 102, 201 and 301 of the Indenture, dated as of March 9, 2001 (the
"Indenture"), between the Company and The Bank of New York, as Trustee (the
"Trustee"), that the authorized officer has determined, pursuant to the
authority granted to him by the Executive Committee of the Board of Directors of
the Company at its meeting held on September 17, 2002, that the terms of a
series of Securities to be issued under the Indenture, and the form thereof, are
as follows:

Designation of Securities        5% Notes due 2012 (the "Notes").

Aggregate Principal Amount       $300,000,000, except for Notes
                                 authenticated and delivered upon registration
                                 of transfer of, or in exchange for, or in lieu
                                 of, other Notes pursuant to Sections 304, 305,
                                 306, 906 or 1107 of the Indenture and except
                                 for any Notes which pursuant to Section 303 are
                                 deemed to never to have been authenticated and
                                 delivered. The Company may reopen this series
                                 of Notes for additional issuances from time to
                                 time pursuant to the terms of the Indenture.

Denominations                    $1,000 and any integral multiple thereof.

Stated Maturity Date             October 1, 2012.

Interest Rate                    5% per annum from September 20, 2002.

Interest Payment Dates           Interest payable semiannually on April 1 and
                                 October 1, commencing April 1,2003.

Regular Record Dates             March 15 or September 15 next preceding an
                                 Interest Payment Date.

Optional Redemption              The Notes may be redeemed at any
                                 time prior to maturity at the option of the
                                 Company, in whole or in part, on the terms and
                                 at the redemption price specified in the form
                                 of Note attached hereto as Annex A, and in
                                 accordance with the terms of the Indenture.

Place of Payment                 The principal of (and premium, if any) and
                                 interest on the Notes shall be payable, Notes
                                 may be surrendered for registration of
                                 transfer, Notes may be surrendered for
                                 exchange, and notices and demands to or upon
                                 the Company in respect of the Notes and the
                                 Indenture may be served, at the places
                                 designated therefore in the Indenture.

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Other Terms                      The provisions of Article Twelve of the
                                 Indenture shall not apply to the Notes.

Global Securities                The Notes shall be issued as a Global Security.
                                 The Depository Trust Company shall be the
                                 Depositary.

Settlement                       Payments in respect of principal of (and
                                 premium if any) and interest on the Notes shall
                                 be made by the Company in immediately available
                                 funds.

Form of Notes                    Attached as Annex A, and incorporated herein by
                                 reference.

We further certify that:

      1. We have read Sections 102, 202, 203 and 301 of the Indenture and the
definitions in the Indenture relating thereto.

      2. The statements made herein are based either upon our personal knowledge
or on information, data and reports furnished to us by the officers, counsel or
employees of the Company who have knowledge of the relevant facts.

      3. In our opinion, we have made such examination or investigation as is
necessary to enable us to express an informed opinion as to whether or not all
conditions provided for in the Indenture with respect to the determination of
the terms of the Notes and the form thereof, and the authentication and delivery
of the Notes, have been complied with.

      4. In our opinion, all conditions precedent to the determination of the
terms and form of the Notes and to the authentication by the Trustee of
$300,000,000 principal amount thereof have been complied with and such Notes may
be delivered in accordance with the Indenture.

      Capitalized terms not otherwise defined herein have the meaning provided
in the Indenture.

                                       2

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         IN WITNESS WHEREOF, we have hereunto signed our names this 20th day of
September, 2002.

                                    /s/ALBERT L. RICHEY
                                    ------------------------------------
                                    Albert L. Richey
                                    Vice President and Treasurer

                                    /s/ SUZANNE SUTER
                                    ------------------------------------
                                    Suzanne Suter
                                    Corporate Secretary

                                       3<PAGE>
                                                                     EXHIBIT 4.2

         THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE TRANSFERRED TO, OR REGISTERED OR
EXCHANGED FOR SECURITIES REGISTERED IN THE NAME OF, ANY PERSON OTHER THAN THE
DEPOSITARY OR A NOMINEE THEREOF AND NO SUCH TRANSFER MAY BE REGISTERED, EXCEPT
IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE. EVERY SECURITY
AUTHENTICATED AND DELIVERED UPON REGISTRATION OF, TRANSFER OF, OR IN EXCHANGE
FOR OR IN LIEU OF, THIS SECURITY SHALL BE A GLOBAL SECURITY SUBJECT TO THE
FOREGOING, EXCEPT IN SUCH LIMITED CIRCUMSTANCES.

         UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION, TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED
IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT IS
MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL IN AS MUCH AS
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

                         ANADARKO PETROLEUM CORPORATION

                               5% NOTES DUE 2012

NO.                                                                        U.S.$
CUSIP No. 032511 AU 1

         ANADARKO PETROLEUM CORPORATION, a corporation duly incorporated and
existing under the laws of Delaware (herein called the "Company," which term
includes any successor Person under the Indenture hereinafter referred to), for
value received, hereby promises to pay to CEDE & CO., or registered assigns, the
principal sum of _____________________________ United States Dollars on October
1, 2012, and to pay interest thereon from September 20, 2002, or from the most
recent Interest Payment Date to which interest has been paid or duly provided
for, semi-annually on April 1 and October 1 in each year, commencing April 1,
2003, at the rate of 5% per annum, until the principal hereof is paid or made
available for payment. The interest so payable, and punctually paid or duly
provided for, on any Interest Payment Date will, as provided in such Indenture,
be paid to the Person in whose name this Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest, which shall be March 15 or September 15 (whether or not a
Business Day), as the case may be, next preceding such Interest Payment Date.
Any such interest not so punctually paid or duly provided for shall forthwith
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cease to be payable to the Holder on such Regular Record Date and shall either
be paid to the Person in whose name this Security (or one or more Predecessor
Securities) is registered at the close of business on a Special Record Date for
the payment of such Defaulted Interest to be fixed by the Trustee, notice of
which shall be given to Holders of Securities of this series not less than 10
days prior to such Special Record Date, or be paid at such time in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Securities of this series may be listed, and upon such notice as
may be required by such exchange, all as more fully provided in said Indenture.

         Payment of the principal of and premium, if any, and interest on this
Security will be made by transfer of immediately available funds to a bank
account in New York, New York designated by the Holder in such coin or currency
of the United States of America as at the time of payment is legal tender for
payment of public and private debts.

         Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.
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         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

Dated: September 20, 2002

                                         ANADARKO PETROLEUM CORPORATION

                                         By:
                                             -----------------------------------
                                             Name:
                                             Title:

         Attest:

         ------------------------------
         Name:
         Title:

                         CERTIFICATE OF AUTHENTICATION

         This is one of the Securities of the series designated therein referred
to in the within-mentioned Indenture.

                                         THE BANK OF NEW YORK, AS TRUSTEE

                                         By:
                                             -----------------------------------
                                             Authorized Signatory
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                         ANADARKO PETROLEUM CORPORATION
                               5% NOTES DUE 2012

         This Security is one of a duly authorized issue of Securities of the
Company (the "Securities"), issued and to be issued in one or more series under
an Indenture dated as of March 9, 2001 (the "Indenture"), between the Company
and The Bank of New York, as Trustee (the "Trustee," which term includes any
successor trustee under the Indenture), to which Indenture and all indentures
supplemental thereto reference is hereby made for a statement of the respective
rights, limitations of rights, obligations, duties and immunities thereunder of
the Company, the Trustee and the Holders of the Securities and of the terms upon
which the Securities are, and are to be, authenticated and delivered. This
Security is one of the series designated on the face hereof.

         The Securities of this series are subject to redemption, upon not less
than 15 nor more than 60 days' notice by mail, as a whole or in part, at the
option of the Company at any time at a Redemption Price equal to the principal
amount of the Securities to be redeemed, plus any accrued and unpaid interest
thereon to the applicable Redemption Date, but interest installments whose
Stated Maturity is on or prior to such Redemption Date will be payable to the
Holders of such Securities, or one or more Predecessor Securities, of record at
the close of business on the relevant Record Dates referred to on the face
hereof, all as provided in the Indenture, plus the "make-whole premium" as
defined below.

         The "make-whole premium" or "premium" with respect to any Security to
be redeemed shall be equal to the excess, if any, of: (a) the sum of the present
values, calculated as of the Redemption Date, of (i) each interest payment that,
but for such redemption, would have been payable on the Security or portion
thereof being redeemed on each Interest Payment Date occurring after the
Redemption Date (excluding any accrued interest for the period prior to the
Redemption Date); and (ii) the principal amount that, but for such redemption,
would have been payable at the final maturity of the Security being redeemed;
over (b) the principal amount of the Security being redeemed.

         The present values of interest and principal payments referred to in
clause (a) of the immediately preceding paragraph will be determined in
accordance with generally accepted principles of financial analysis. These
present values will be calculated by discounting the amount of each payment of
interest or principal from the date that each such payment would have been
payable, but for the redemption, to the Redemption Date at a discount rate equal
to the comparable treasury yield (as defined below) plus 20 basis points. The
make-whole premium will be calculated by an independent investment banking
institution of national standing appointed by the Company. If the Company fails
to appoint an independent investment banker not less than 15 days prior to the
Redemption Date, or if such independent investment banker is unwilling or unable
to make the calculation, the calculation will be made by Deutsche Bank
Securities, Inc. If Deutsche Bank Securities, Inc. is unwilling or unable to
make the calculation, the Trustee will appoint an independent investment banking
institution of national standing to make the calculation.

         For purposes of determining the make-whole premium, comparable treasury
yield means a rate of interest per annum equal to the weekly average yield to
maturity of United States Treasury Notes that have a constant maturity that
corresponds to the remaining term to maturity
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of the Securities, calculated to the nearest 1/12th of a year. The comparable
treasury yield will be determined as of the third business day immediately
preceding the applicable Redemption Date.

         The weekly average yields of United States Treasury Notes will be
determined by reference to the most recent statistical release published by the
Federal Reserve Bank of New York and designated "H.15(519) Selected Interest
Rates" or any successor release. If the H.15 statistical release sets forth a
weekly average yield for United States Treasury Notes having a constant maturity
that is the same as the remaining term calculated as set forth above, then the
comparable treasury yield will be equal to such weekly average yield. In all
other cases, the comparable treasury yield will be calculated by interpolation
on a straight-line basis, between the weekly average yields on the United States
Treasury Notes that have a constant maturity closest to and greater than the
remaining term and the United States Treasury Notes that have a constant
maturity closest to and less than the remaining term (in each case as set forth
in the H.15 statistical release or any successor release). Any weekly average
yields calculated by interpolation will be rounded to the nearest 1/100th of 1%,
with any figure of 1/200th of 1% or above being rounded upward. If weekly
average yields for United States Treasury Notes are not available in the H.15
statistical release or otherwise, then the comparable treasury yield will be
calculated by interpolation of comparable rates selected by an independent
investment banking institution of national standing selected in the manner
described in the second preceding paragraph.

         In the event of redemption of this Security in part only, a new
Security or Securities of this series and of like tenor for the unredeemed
portion hereof will be issued in the name of the Holder hereof upon the
cancellation hereof.

         If an Event of Default with respect to the Securities of this series
shall occur and be continuing, the principal of the Securities of this series
may be declared due and payable in the manner and with the effect provided in
the Indenture.

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of a majority in aggregate principal amount of the
Outstanding Securities of each series to be affected. The Indenture also
contains provisions permitting the Holders of specified percentages in principal
amount of the Securities of each series at the time Outstanding, on behalf of
the Holders of all Securities of such series, to waive compliance by the Company
with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of
this Security shall be conclusive and binding upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration
of transfer hereof or in exchange herefor or in lieu hereof, whether or not
notation of such consent or waiver is made upon this Security.

         No reference herein to the Indenture and no provision of this Security
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal of, premium, if any, and
interest on this Security at the times, place(s) and rate, and in the coin or
currency, herein prescribed.
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         This Global Security or portion hereof may not be exchanged for
Definitive Securities except in the limited circumstances provided in the
Indenture.

         The holders of beneficial interests in this Global Security will not be
entitled to receive physical delivery of Definitive Securities except as
described in the Indenture and will not be considered the Holders hereof for any
purpose under the Indenture.

         The Securities of this series are issuable only in registered form,
without coupons, in denominations of U.S. $1,000 and any integral multiple
thereof. As provided in the Indenture and subject to certain limitations therein
set forth, the Securities of this series are exchangeable for a like aggregate
principal amount of Securities of this series of a different authorized
denomination, as requested by the Holder surrendering the same.

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any transfer tax or other similar governmental charge payable in connection
therewith.

         Prior to due presentment of this Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name this Security is registered as the owner hereof for all
purposes, whether or not this Security be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         No recourse under or upon any obligation, covenant or agreement of or
contained in the Indenture or of or contained in any Security, or for any claim
based thereon or otherwise in respect thereof, or in any Security, or because of
the creation of any indebtedness represented thereby, shall be had against any
incorporator, stockholder, officer or director, as such, past, present or
future, of the Company or of any successor Person, either directly or through
the Company or any successor Person, whether by virtue of any constitution,
statute or rule of law, or by the enforcement of any assessment, penalty or
otherwise; it being expressly understood that all such liability is hereby
expressly waived and released by the acceptance hereof and as a condition of,
and as part of the consideration for, the Securities and the execution of the
Indenture.

         The Indenture provides that the Company (a) will be discharged from any
and all obligations in respect of the Securities (except for certain obligations
described in the Indenture), or (b) need not comply with certain restrictive
covenants of the Indenture, in each case if the Company deposits, in trust, with
the Trustee money or U.S. Government Obligations (or a combination thereof)
which through the payment of interest thereon and principal thereof in
accordance with their terms will provide money, in an amount sufficient to pay
all the principal of and interest on the Securities, but such money need not be
segregated from other funds except to the extent required by law.

         All terms used in this Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

         THIS SECURITY SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK.

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