Exhibit 4.29

   

  KERR-MCGEE CORPORATION

   

  ANADARKO PETROLEUM CORPORATION

  

    to

   

  The Bank of New York Mellon Trust Company, N.A.,

   

  as Trustee

   

  Tenth Supplemental Indenture

   

  Dated as of                     , 2019

    Amending and Supplementing the Indenture

    Dated as of August 1, 1982

  
    
      
 

  

  
  TENTH SUPPLEMENTAL INDENTURE

   

  THIS TENTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of                       , 2019, by and among Kerr-McGee Corporation, a Delaware corporation
    (the “Company”), Anadarko Petroleum Corporation (the “Parent Guarantor”), a Delaware corporation and The Bank of New York Mellon Trust Company, N.A., a national banking association incorporated and existing under the laws of
    the United States of America (as successor in interest to Citibank, N.A.), as trustee under the indenture referred to below (the “Trustee”).

   

  WITNESSETH:

   

  WHEREAS, the Company and the Trustee are parties to that certain Indenture, dated as of August 1, 1982, as supplemented by that certain First Supplemental Indenture, dated as of May 7,
    1996, between the Company and the Trustee, that certain Second Supplemental Indenture, dated as of August 2, 1999, between the Company and the Trustee, that certain Third Supplemental Indenture, dated as of November 1, 1999, between the Company and the
    Trustee, that certain Fourth Supplemental Indenture, dated as of January 18, 2000, between the Company and the Trustee, that certain Fifth Supplemental Indenture, dated as of February 11, 2000, between the Company and the Trustee, that certain Sixth
    Supplemental Indenture, dated as of June 26, 2001, between the Company and the Trustee, that certain Seventh Supplemental Indenture, dated as of August 1, 2001, between the Company and the Trustee, that certain Eighth Supplemental Indenture, dated as
    of December 31, 2002, between the Company and the Trustee and that certain Ninth Supplemental Indenture, dated as of October 4, 2006, between the Company, the Parent Guarantor and the Trustee (as so supplemented, the “Indenture”),
    providing for the issuance from time to time of its unsecured debentures, notes or other evidences of indebtedness in one or more series (the “Securities”), up to such principal amounts as may be authorized in or pursuant to one or more
    Board Resolutions;

   

  WHEREAS, there are Outstanding on the date hereof Securities of one series consisting of $150,000,000 aggregate principal amount of the 7.125% Debentures due September 15, 2027 (the “Outstanding

        Securities”);

   

  WHEREAS, pursuant to Section 902 of the Indenture, with the consent of the Holders of not less than 662/3% in aggregate principal amount of the Outstanding Securities of all series affected by this Supplemental Indenture (voting as one class) (the “Requisite Consent”),
    the Company, when authorized by a Board Resolution, and the Trustee may enter into a supplemental indenture to add, change or eliminate any provisions of the Indenture or of any supplemental indenture or to modify, in the manner provided for in Section
    902 of the Indenture, the Indenture or modify the rights of the Holders of the Outstanding Securities of each such series;

   

  WHEREAS, upon the terms and subject to the conditions set forth in its offer to exchange and solicitation of consents, dated as of                            , 2019, in respect of the
    Notes (the “Consent Solicitation Statement”), Occidental Petroleum Corporation, on behalf of the Company, has been soliciting consents (the “Consent Solicitation”) of, among others, the Holders of the Outstanding Securities
    to certain proposed amendments to the Indenture, requiring the Requisite Consent of Holders and to the execution of this Supplemental Indenture, as described in more detail in the Consent Solicitation Statement, and the Company has now obtained such
    Requisite Consent of Holders, and, as such, this Supplemental Indenture, the amendments set forth herein and the Trustee’s entry into this Supplemental Indenture are authorized pursuant to Section 902 of the Indenture;

  
    2

    
      
 

  

  WHEREAS, pursuant to Sections 902, 903, 905, 102 and 103 of the Indenture, the Company has delivered to the Trustee a request for the Trustee to join with the Company in the execution
    of this Supplemental Indenture, along with (1) evidence of the Requisite Consent the Company has received from the Holders of the Outstanding Securities, as certified by Global Bondholder Services Corporation, (2) a copy of a Board Resolution
    authorizing the execution of this Supplemental Indenture, (3) an Officers’ Certificate and (4) an Opinion of Counsel; and

   

  WHEREAS, the execution and delivery of this Supplemental Indenture has been duly authorized by a Board Resolution and all acts, conditions and requirements necessary to make this
    Supplemental Indenture a valid and binding agreement in accordance with its terms and for the purposes set forth herein have been done and taken, and the execution and delivery of this Supplemental Indenture has been in all respects duly authorized.

   

  NOW, THEREFORE, intending to be legally bound hereby, each of the Company, the Parent Guarantor and the Trustee has executed and delivered this Supplemental Indenture.

   

  ARTICLE One

   

  INDENTURE

   

  SECTION 101.   Effectiveness of Indenture.

   

  (a)       Except as specifically provided in this Supplemental Indenture, the Indenture, as heretofore supplemented and amended, shall remain in full force and effect.
    This Supplemental Indenture shall constitute an indenture supplemental to the Indenture and shall be construed in connection with and form a part of the Indenture for all purposes, and every Holder of Securities heretofore or hereafter authenticated
    and delivered shall be bound hereby.

   

  (b)       The Company represents and warrants that each of the conditions of the Consent Solicitation as set forth in the Consent Solicitation Statement have been
    satisfied, or where permitted, waived, in all respects.

   

  (c)       This Supplemental Indenture shall be effective only upon execution and delivery of this instrument by the parties hereto. Notwithstanding the foregoing
    sentence, this Supplemental Indenture shall become operative only upon the completion and settlement of the Consent Solicitation and the related exchange offers, with the result that the amendments to the Indenture effected by this Supplemental
    Indenture shall be not become effective if such Consent Solicitations and related exchange offers are terminated or withdrawn prior to completion or settlement. The Company shall promptly notify the Trustee if the Company shall determine that such
    closing will not occur.

  
    3

    
      
 

  

  ARTICLE Two

      

      AMENDMENTS TO THE INDENTURE

   

  SECTION 201.   Amendments to the Indenture. Pursuant to Section 902 of the Indenture, the Company, the Parent Guarantor and the Trustee (in the case of the
    Trustee, acting in reliance upon the instructions and directions of the Holders of the Requisite Consent obtained pursuant to the Consent Solicitation Statement) hereby agree to amend or supplement certain provisions of the Indenture as follows:

   

  (a)       Section 101 of the Indenture (Definitions) is hereby modified so that the defined term of “Officers’ Certificate” is amended and restated in its entirety by
    the following (and all references to the term “Officers’ Certificate” in the Indenture are replaced with “Officer’s Certificate”):

   

  ““Officer’s Certificate” means a certificate signed by the Chairman of the Board, the President, a Vice President, the Treasurer or an Assistant
    Treasurer of the Company or the Secretary or an Assistant Secretary of the Company, and delivered to the Trustee.”

   

  (b)       The fifth paragraph of Section 307 of the Indenture (Temporary Securities) is hereby amended and restated in its entirety by the following:

   

  “The Company may at any time and in its sole discretion determine that the Securities of any series issued in the form of one or more Global Securities shall, in whole or in part, no
    longer be represented by such Global Security or Securities. In such event, the Company will execute, and the Trustee, upon receipt of a Company Order for the authentication and delivery of definitive Securities of such series, will authenticate and
    deliver, Securities of such series in definitive form and in an aggregate principal. amount equal to the principal amount of the Global Security or Securities representing such series in exchange for such Global Security or Securities (or portion
    thereof).”

   

  (c)       The seventh paragraph of Section 307 of the Indenture (Temporary Securities) is hereby amended and restated in its entirety by the following:

   

  “If specified by the Company pursuant to Section 301 or pursuant to a Company Order as described in the second preceding paragraph of this Section 307 with respect to Securities of a
    series, the U.S. Depositary for such series of Securities may surrender a Global Security for such series of Securities in exchange in whole or in part for Securities of such series in definitive form on such terms as are acceptable to the Company and
    such depositary. Thereupon, the Company shall execute and the Trustee shall authenticate and deliver, without charge:”

  
    4

    
      
 

  

  (d)       Section 704 of the Indenture (Reports by Company) is hereby amended and restated in its entirety by the following:

   

  “SECTION 704. Reports by Company

   

  The Company shall comply with the provisions of Section 314(a) of the Trust Indenture Act to the extent applicable.”

   

  (e)       Section 801 of the Indenture (Consolidations and Mergers of the Company and Conveyances Permitted Subject to Certain Conditions) is hereby amended and
    restated in its entirety by the following:

   

  “SECTION 801. Consolidations and Mergers of Company and Conveyances Permitted Subject to Certain Conditions.

   

  The Company may consolidate with or merge with or into any other Person, provided that in any such case, either the Company shall be
    the continuing Person, or the successor Person shall expressly assume the due and punctual payment of the principal of and interest on all the Securities, according to their tenor, and the due and punctual performance and observance of all of the
    covenants and conditions of this Indenture to be performed by the Company by supplemental indenture satisfactory to the Trustee, executed and delivered to the Trustee by such Person.”

   

  (f)       Section 802 of the Indenture (Rights and Duties of Successor Corporation) is hereby amended and restated in its entirety by the following:

   

  “SECTION 802. Rights and Duties of Successor Corporation.

   

  In case of any such consolidation or merger and upon any such assumption by the successor Person, such successor Person shall succeed to and be
    substituted for the Company, with the same effect as if it has been named herein as the Company, and the predecessor Person shall be relieved of any obligation under this Indenture and the Securities. Such successor Person thereupon may cause to be
    signed, and may issue either in its own name or in the name of the Company, any or all of the Securities issuable hereunder which theretofore shall not have been signed by the Company and delivered to the Trustee; and, upon the order of such successor
    Person, instead of the Company, and subject to all the terms, conditions and limitations in this Indenture prescribed, the Trustee shall authenticate and shall deliver any Securities which previously shall have been signed and delivered by the officers
    of the Company to the Trustee for authentication, and any Securities which such successor Person thereafter shall cause to be signed and delivered to the Trustee for that purpose. All the Securities so issued shall in all respects have the same legal
    rank and benefit under this Indenture as the Securities theretofore and thereafter issued in accordance with the terms of this Indenture as though all of such Securities had been issued at the date of the execution hereof.

  
    5

    
      
 

  

  In case of any such consolidation or merger such changes in phraseology and form (but not in substance) may be made in the Securities thereafter issued as may be appropriate.”

   

  (g)       Section 1506 of the Indenture (When Parent Guarantor May Consolidate or Merge) is hereby amended and restated in its entirety by the following:

   

  “SECTION 1506. When Parent Guarantor May Consolidate or Merge. Parent Guarantor will not consolidate with or merge with or into any Person unless:

   

  (A)          the resulting, surviving or transferee Person (if not Parent Guarantor or the Company) shall be a Person organized and existing under the laws of the jurisdiction
    under which Parent Guarantor was organized or under the laws of the United States of America, or any State thereof or the District of Columbia, and such Person shall expressly assume all the obligations of Parent Guarantor under its Parent Guarantee
    hereunder; and

   

  (B)          the Company delivers to the Trustee an Officer’s Certificate and an Opinion of Counsel, each stating that such consolidation or merger, and, if applicable, the
    assumption by the resulting or surviving Person of Parent Guarantor’s obligations under its Parent Guarantee hereunder, complies with the Indenture.

   

  If the conditions set forth in (A) and (B) above are otherwise satisfied, the consolidation or merger of Parent Guarantor with or into any Person shall not be or be deemed to
    be a violation, default or breach by Parent Guarantor of any of the provisions of Article Fifteen hereof.”

   

  (h)       The Indenture is hereby amended by deleting the following Sections and Articles of the Indenture and all references and definitions to the extent solely
    relating thereto in their entirety and replacing each such Section or Article with “[Intentionally Omitted]”:

   

  (i)        Section 803 (Securities to be Secured in Certain Events);

   

  (ii)       Section 805 (Limitation on Lease of Properties as an Entirety);

   

  (iii)      Section 1004 (Payment of Taxes and Other Claims);

   

  (iv)      Section 1005 (Maintenance of Principal Properties);

   

  (v)       Section 1007 (Corporate Existence);

   

  
    6

    
      
 

  

  (vi)       Section 1008 (Limitation on Secured Debt); and

   

  (vii)       Section 1009 (Limitation on Sales and Leasebacks).

   

  SECTION 202.   Amendments to the Outstanding Securities.

   

  The Outstanding Securities are hereby amended to delete or modify all provisions inconsistent with the amendment to the Indenture effected by this Supplemental
    Indenture, and each Global Security shall be deemed supplemented, modified and amended in such manner as necessary to make the terms of such Global Security consistent with the terms of the Indenture, as amended by this Supplemental Indenture. To the
    extent of any conflict between the terms of the Global Security and the terms of the Indenture, as amended by this Supplemental Indenture, the terms of the Indenture, as amended by this Supplemental Indenture, shall govern and be controlling.

   

  ARTICLE Three

   

  MISCELLANEOUS PROVISIONS

   

  SECTION 301.   Trustee. 

   

  The Trustee accepts the amendments of the Indenture effected by this Supplemental Indenture and agrees to execute the trust created by the Indenture as hereby
    amended, but only upon the terms and conditions set forth in the Indenture, including the terms and provisions defining and limiting its liabilities and responsibilities in the performance of the trust created by the Indenture as hereby amended.
    Without limiting the generality of the foregoing, the Trustee shall not be responsible in any manner whatsoever for or with respect to any of the recitals or statements contained herein, all of which recitals or statements are made solely by the
    Company, and the Trustee makes no representation with respect to any such matters. Additionally, the Trustee makes no representation or warranty as to the validity or sufficiency of this Supplemental Indenture. For the avoidance of doubt, the Trustee,
    by executing this Supplemental Indenture in accordance with the terms of the Indenture, does not agree to undertake additional actions nor does it consent to any transaction beyond what is expressly set forth in this Supplemental Indenture, and the
    Trustee reserves all rights and remedies under the Indenture, as amended by this Supplemental Indenture.

   

  SECTION 302.   Capitalized Terms. 

   

  Capitalized terms used herein and not otherwise defined herein are used with the respective meanings ascribed to such terms in the Indenture. The words “herein,”
    “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and not to any particular section hereof.

  
    7

    
      
 

  

  SECTION 303.   Provisions Binding on Successors. 

   

  All of the covenants, stipulations, promises and agreements made in this Supplemental Indenture by each of the parties hereto shall bind its successors and assigns
    whether so expressed or not.

   

  SECTION 304.   Effect of Headings. 

   

  The Article and Section headings herein are for convenience only and shall not affect the construction hereof.

   

  SECTION 305.   Governing Law. 

   

  This Supplemental Indenture shall be deemed to be a contract made under the law of the State of New York and for all purposes shall be construed in accordance with
    the law of said State.

   

  SECTION 306.   Counterparts. 

   

  This Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts
    shall together constitute but one and the same instrument. This Supplemental Indenture shall become effective and constitute a binding agreement between the parties hereto when counterparts hereof shall have been executed and delivered by each of the
    parties hereto.

   

  SECTION 307.   Separability Clause. 

   

  In case any provision in this Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining
    provisions shall not in any way be affected or impaired thereby.

   

  SECTION 308.   Conflicts. 

   

  To the extent of any inconsistency between the terms of the Indenture and this Supplemental Indenture, the terms of this Supplemental Indenture will control. If any
    provision hereof limits, qualifies or conflicts with another provision hereof or of the Indenture which is required to be included in the Indenture by any of the provisions of the Trust Indenture Act, such required provisions shall control.

   

  SECTION 309.   Entire Agreement.

   

  This Supplemental Indenture, together with the Indenture, constitutes the entire agreement of the parties hereto with respect to the amendments to the Indenture set
    forth herein.

   

  [SIGNATURE PAGE FOLLOWS]

  
    8

    
      
 

  

  IN WITNESS WHEREOF, the parties hereto have executed this Tenth Supplemental Indenture as of the date first above written. 

  	 	 	 	 
	 	 	KERR-MCGEE CORPORATION
	 	 	 
	 	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	 
	Attest:	 	 
	 	 	 
	Name:	 	 
	Title:	 	 
	 	 	 
	 	 	ANADARKO PETROLEUM CORPORATION, as Parent Guarantor
	 	 	 
	 	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	 
	Attest:	 	 
	 	 	 
	Name:	 	 
	Title:	 	 
	 	 	 
	 	 	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee
	 	 	 
	 	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	 
	Attest:	 	 
	 	 	 
	Name:	 	 
	Title: