Document:

<PAGE>
                                                                   EXHIBIT 4.3.2

================================================================================

                          CHESAPEAKE ENERGY CORPORATION

                                       and

                     the Subsidiary Guarantors named herein

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

                          8 1/8% SENIOR NOTES DUE 2011

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

                                   ----------

                          THIRD SUPPLEMENTAL INDENTURE

                           DATED AS OF October 1, 2001

                                   ----------

                              THE BANK OF NEW YORK

                             as successor Trustee to

                     United States Trust Company of New York

                                   ----------

================================================================================

<PAGE>

         THIS THIRD SUPPLEMENTAL INDENTURE, dated as of October 1, 2001, is
among Chesapeake Energy Corporation, an Oklahoma corporation (the "Company"),
each of the parties identified under the caption "Subsidiary Guarantors" on the
signature page hereto (the "Subsidiary Guarantors") and The Bank of New York, as
successor to United States Trust Company of New York, as Trustee.

                                    RECITALS

         WHEREAS, the Company, the Subsidiary Guarantors a party thereto and the
Trustee entered into an Indenture, dated as of April 6, 2001, as supplemented by
that certain Supplemental Indenture dated May 14, 2001, and that certain Second
Supplemental Indenture dated September 12, 2001 (the "Indenture"), pursuant to
which the Company has originally issued $800,000,000 in principal amount of
8 1/8% Senior Notes due 2011 (the "Notes"); and

         WHEREAS, Section 9.01(3) of the Indenture provides that the Company,
the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture
without notice to or consent of any Holder to reflect the release of any
Subsidiary Guarantor, as provided for in the Indenture; and

         WHEREAS, the Company has taken all actions required to effect the
release, pursuant to Section 10.04 of the Indenture, of Chesapeake Canada
Corporation, an Alberta, Canada corporation ("Chesapeake Canada"), as a
Subsidiary Guarantor; and

         WHEREAS, all acts and things prescribed by the Indenture, by law and by
the charter and the bylaws (or comparable constituent documents) of the Company,
of the Subsidiary Guarantors and of the Trustee necessary to make this Third
Supplemental Indenture a valid instrument legally binding on the Company, the
Subsidiary Guarantors and the Trustee, in accordance with its terms, have been
duly done and performed;

         NOW, THEREFORE, to comply with the provisions of the Indenture and in
consideration of the above premises, the Company, the Subsidiary Guarantors and
the Trustee covenant and agree for the equal and proportionate benefit of the
respective Holders of the Notes as follows:

                                    ARTICLE 1

         Section 1.01. This Third Supplemental Indenture is supplemental to the
Indenture and does and shall be deemed to form a part of, and shall be construed
in connection with and as part of, the Indenture for any and all purposes.

         Section 1.02. This Third Supplemental Indenture shall become effective
immediately upon its execution and delivery by each of the Company, the
Subsidiary Guarantors and the Trustee.

                                    ARTICLE 2

         Chesapeake Canada shall for all purposes be released as a Subsidiary
Guarantor from all of its Guarantee and related obligations in the Indenture,
pursuant to Section 10.04 of the Indenture.

<PAGE>

The notation on the Securities relating to the Guarantee shall be deemed to
exclude the name of Chesapeake Canada and the signature of an Officer of
Chesapeake Canada on its behalf.

                                    ARTICLE 3

         Section 3.01. Except as specifically modified herein, the Indenture and
the Notes are in all respects ratified and confirmed (mutatis mutandis) and
shall remain in full force and effect in accordance with their terms with all
capitalized terms used herein without definition having the same respective
meanings ascribed to them as in the Indenture.

         Section 3.02. Except as otherwise expressly provided herein, no duties,
responsibilities or liabilities are assumed, or shall be construed to be
assumed, by the Trustee by reason of this Third Supplemental Indenture. This
Third Supplemental Indenture is executed and accepted by the Trustee subject to
all the terms and conditions set forth in the Indenture with the same force and
effect as if those terms and conditions were repeated at length herein and made
applicable to the Trustee with respect hereto.

         Section 3.03. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED
TO CONSTRUE AND ENFORCE THIS THIRD SUPPLEMENTAL INDENTURE.

         Section 3.04. The parties may sign any number of copies of this Third
Supplemental Indenture. Each signed copy shall be an original, but all of such
executed copies together shall represent the same agreement.

                          [NEXT PAGE IS SIGNATURE PAGE]

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Third
Supplemental Indenture to be duly executed, all as of the date first written
above.

                                   COMPANY:

                                   CHESAPEAKE ENERGY CORPORATION

                                   By    /s/ Aubrey K. McClendon
                                     ------------------------------------------
                                   Name:    Aubrey K. McClendon
                                        ---------------------------------------
                                   Title:   Chief Executive Officer
                                         --------------------------------------

                                   SUBSIDIARY GUARANTORS:

                                   THE AMES COMPANY, INC.
                                   CHESAPEAKE ACQUISITION CORPORATION
                                   CHESAPEAKE ROYALTY COMPANY
                                   NOMAC DRILLING CORPORATION
                                   CHESAPEAKE ENERGY LOUISIANA
                                   CORPORATION
                                   CHESAPEAKE OPERATING, INC.
                                   CHESAPEAKE MOUNTAIN FRONT CORP.
                                   GOTHIC ENERGY CORPORATION
                                   GOTHIC PRODUCTION CORPORATION

                                   By    /s/ AUBREY K. MCCLENDON
                                     ------------------------------------------
                                   Name:    Aubrey K. McClendon
                                        ---------------------------------------
                                   Title:   Chief Executive Officer
                                         --------------------------------------

                                   CHESAPEAKE EXPLORATION LIMITED
                                   PARTNERSHIP
                                   CHESAPEAKE LOUISIANA, L.P.
                                   CHESAPEAKE PANHANDLE LIMITED
                                   PARTNERSHIP
                                   CHESAPEAKE-STAGHORN ACQUISITION L.P.

                                     By: Chesapeake Operating, Inc. as general
                                         partner of each representative entity

                                     By   /s/ AUBREY K. MCCLENDON
                                       ----------------------------------------
                                     Name:    Aubrey K. McClendon
                                          -------------------------------------
                                     Title:   Chief Executive Officer
                                           ------------------------------------

<PAGE>

                                   ARKOMA PITTSBURG HOLDING
                                   CORPORATION

                                   By   /s/ HENRY J. HOOD
                                     ------------------------------------------
                                   Name:    Henry J. Hood
                                        ---------------------------------------
                                   Title:   President
                                         --------------------------------------

                                   TRUSTEE:

                                   THE BANK OF NEW YORK, as successor to
                                   United States Trust Company of New York,
                                   as Trustee

                                   By   /s/ LOUIS P. YOUNG
                                     ------------------------------------------
                                   Name:    Louis P. Young
                                        ---------------------------------------
                                   Title:   Authorized Signer
                                         --------------------------------------<PAGE>
                                                                   EXHIBIT 4.6.1

                         UNION BANK OF CALIFORNIA, N.A.
                               4200 LINCOLN PLAZA
                                 500 NORTH AKARD
                               DALLAS, TEXAS 75201

                               September 10, 2001

Chesapeake Energy Corporation
Chesapeake Exploration Limited Partnership
6100 North Western Avenue
Oklahoma City, Oklahoma 73118

Re:       Second Amended and Restated Credit Agreement dated as of June 11, 2001
          (as amended, supplemented or restated, the "Credit Agreement"), by and
          among Chesapeake Exploration Limited Partnership, an Oklahoma limited
          partnership ("Borrower"), Chesapeake Energy Corporation, an Oklahoma
          corporation ("Company"), Bear Stearns Corporate Lending Inc., as
          syndication agent ("Syndication Agent"), Union Bank of California,
          N.A., as administrative agent and collateral agent ("Administrative
          Agent"), and the several banks and other financial institutions or
          entities from time to time parties thereto ("Lenders")

Ladies and Gentlemen:

         Reference is hereby made to the Credit Agreement. Terms which are
defined in the Credit Agreement and not otherwise defined herein are used herein
with the meanings given them in the Credit Agreement.

         Borrower and Company have requested that Administrative Agent and
Lenders consent to the purchase by Company of a portion of the outstanding
11 1/2% Senior Notes due 2008 issued by RAM Energy, Inc. from the holders
thereof for cash (the "Note Purchases"). In addition, Borrower and Company have
requested that Administrative Agent and Lenders consent to the sale by Company
of all of the outstanding capital stock of Chesapeake Canada Corporation to a
Person that is not an Affiliate of Company for a sales price of approximately
C $232,000,000 (the "Canadian Sale").

         Subject to the terms and provisions hereof, Administrative Agent and
Lenders hereby:

                  (a) (i) consent to the Note Purchases, (ii) waive any
         violations of the Credit Agreement resulting therefrom, and (iii) agree
         that such Note Purchases shall be permitted

<PAGE>

         in addition to the Investments otherwise permitted pursuant to Section
         7.7 of the Credit Agreement; provided that (1) at the time of each Note
         Purchase, no Default or Event of Default (excluding any occurring
         pursuant to a Note Purchase) has occurred which is continuing, (2) the
         Note Purchases shall be approved by the Board of Directors of Company,
         (3) the aggregate cash purchase price for all Note Purchases paid to
         the holders thereof pursuant to this Letter Agreement shall not exceed
         $50,000,000, (4) the Canadian Sale shall have consummated prior to the
         commencement of such Note Purchases, and (5) nothing in this Letter
         Agreement shall allow any Person to make any other new Investments not
         allowed pursuant to Section 7.7 of the Credit Agreement; and

                  (b) (i) consent to the Canadian Sale, (ii) waive any
         violations of the Credit Agreement resulting therefrom, and (iii) agree
         that the Canadian Sale shall be in addition to the asset dispositions
         otherwise permitted pursuant to Section 7.5 of the Credit Agreement;
         provided that (1) at the time of the Canadian Sale, no Default or Event
         of Default (excluding any occurring pursuant to the Canadian Sale) has
         occurred which is continuing, (2) the Canadian Sale shall be approved
         by the Board of Directors of Company, (3) the net cash proceeds from
         the Canadian Sale shall be paid to the Administrative Agent, for the
         benefit of the Lenders, for application to the Revolving Loans pursuant
         to the provisions of the Credit Agreement (and such payment shall not
         be deemed to constitute a reduction in the Borrowing Base or otherwise
         affect Borrower's ability to request Revolving Loans pursuant to the
         terms of the Credit Agreement), (4) the Canadian Sale shall be
         consummated on or before December 31, 2001, and (5) nothing in this
         Letter Agreement shall allow any Person to make any other asset
         dispositions not allowed pursuant to Section 7.5 of the Credit
         Agreement.

The limitations set forth in clause (a) above shall not be deemed to restrict
Investments otherwise allowed under clause (n) of Section 7.7 of the Credit
Agreement, including without limitation, additional Note Purchases under such
clause.

         The Credit Agreement is hereby ratified and confirmed in all respects.
Except as expressly set forth above, the execution, delivery and effectiveness
of this Letter Agreement shall not operate as a waiver of any right, power or
remedy of Administrative Agent or Lenders under the Credit Agreement, the Notes,
or any other Loan Document, nor constitute a waiver of any provision of the
Credit Agreement, the Notes, or any other Loan Document.

         By its execution below, each Guarantor hereby (i) consents to the
provisions of this Letter Agreement and the transactions contemplated herein,
(ii) ratifies and confirms the Guarantee Agreement dated as of June 11, 2001
made by it for the benefit of Administrative Agent and Lenders and the other
Loan Documents executed pursuant to the Credit Agreement, (iii) agrees that all
of its respective obligations and covenants thereunder shall remain unimpaired
by the execution and delivery of this Letter Agreement and the other documents
and instruments executed in connection herewith, and (iv) agrees that the
Guarantee Agreement and such other Loan Documents shall remain in full force and
effect.

<PAGE>

         This Letter Agreement is a "Loan Document" as defined and described in
the Credit Agreement and all of the terms and provisions of the Credit Agreement
relating to Loan Documents shall apply hereto. This Letter Agreement may be
executed in multiple counterparts, all of which shall constitute one Letter
Agreement. This Letter Agreement may be validly executed by facsimile or other
electronic transmission.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK.]

<PAGE>

         Please execute a copy of this Letter Agreement in the space provided
below to evidence your agreement to and acknowledgment of the foregoing.

                               Very truly yours,

                               UNION BANK OF CALIFORNIA, N.A.
                               Administrative Agent, Collateral Agent
                               and Lender

                               By:  /s/ RANDALL OSTERBERG
                                  ------------------------------------------
                               Name:    Randall Osterberg
                                    ----------------------------------------
                               Title:   Senior Vice President
                                     ---------------------------------------

                               By:  /s/ SEAN MURPHY
                                  ------------------------------------------
                               Name:    Sean Murphy
                                    ----------------------------------------
                               Title:   Assistant Vice President
                                     ---------------------------------------

ACKNOWLEDGED AND AGREED
to as of the date first written above:

By:  Chesapeake Operating, Inc., its general partner

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

GUARANTORS:

CHESAPEAKE ENERGY CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:

<PAGE>

         Title:

THE AMES COMPANY, INC.

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

ARKOMA PITTSBURG HOLDING CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE ACQUISITION CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE ENERGY LOUISIANA CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE OPERATING, INC.

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

<PAGE>

CHESAPEAKE OPERATING, INC., as General Partner of
Chesapeake Panhandle Limited Partnership

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE ROYALTY COMPANY

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE OPERATING, INC., as General Partner of
Chesapeake-Staghorn Acquisition L.P.

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE OPERATING, INC., as General Partner of
Chesapeake Louisiana, L.P.

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

CHESAPEAKE OPERATING, INC., as General Partner of
Chesapeake Exploration Limited Partnership

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

<PAGE>
GOTHIC ENERGY CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

GOTHIC PRODUCTION CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

NOMAC DRILLING CORPORATION

By:  /s/ MARTHA A. BURGER
     --------------------------------------
     Name:
     Title:

                               LENDERS:

                               BANK OF OKLAHOMA. N.A.

                               By:   /s/ JOHN N. HUFF
                                  ------------------------------------------
                                  Name:  John N. Huff
                                  Title: Vice President

                               BANK OF SCOTLAND

                               By:   /s/ JOSEPH FRATUS
                                  ------------------------------------------
                                  Name:  Joseph Fratus
                                  Title: Vice President

                               BEAR STEARNS CORPORATE LENDING INC.

                               By:  /s/ VICTOR F. BULZACCHELLI
                                  ------------------------------------------
                                  Name: Victor F. Bulzacchelli
                                        Managing Director
<PAGE>
                                     Title:

                                  BNP PARIBAS

                                  By: /s/ A. DAVID DODD   /s/ LARRY ROBINSON
                                     ------------------------------------------
                                  Name:   A. David Dodd       Larry Robinson
                                  Title:  Vice President      Vice President

                                  COMERICA BANK - TEXAS

                                  By: /s/ PETER L. SEFZIK
                                     ------------------------------------------
                                  Name:     Peter L. Sefzik
                                  Title:    Corporate Banking Officer

                                  COMPASS BANK

                                  By: /s/ KATHLEEN J. BOWEN
                                     ------------------------------------------
                                  Name:     Kathleen J. Bowen
                                  Title:    Vice President

                                  CREDIT AGRICOLE INDOSUEZ

/s/ PATRICK COCQUEREL             By: /s/ BRIAN D. KNEZEAL
---------------------------          ------------------------------------------
    Patrick Cocquerel             Name:     Brian D. Knezeal
    FVP, Managing Director        Title:    First Vice President

                                  NATEXIS BANQUES POPULAIRES

/s/ LOUIS P. LAVILLE, III        By:  /s/ DONOVAN C. BROUSSARD
---------------------------          ------------------------------------------
    Louis P. Laville, III        Name:     Donovan C. Broussard
    Vice President and           Title:    Vice President
      Group Manager

                                  NATIONAL BANK OF CANADA, NEW YORK
                                  BRANCH

                                  By: /s/ RANDALL K. WILHOIT
                                     ------------------------------------------
                                  Name:      Randall K. Wilhoit
                                  Title:     Vice President

<PAGE>
                                  By: /s/ DOUG CLARK
                                     ------------------------------------------
                                  Name:   Doug Clark
                                  Title:  Vice President

                                  RZB FINANCE LLC

                                  By: /s/ DIETER BEINTREXLER
                                     ------------------------------------------
                                  Name:     Dieter Beintrexler
                                  Title:    President

                                  By: /s/ FRANK J. YAUTZ
                                     ------------------------------------------
                                  Name:     Frank J. Yautz
                                  Title:    First Vice President

                                  SUMITOMO MITSUI BANKING CORPORATION

                                  By: /s/ DAVID A. BUCK
                                     ------------------------------------------
                                  Name:      David A. Buck
                                  Title:     Senior Vice President

                                  TORONTO DOMINION (TEXAS), INC.

                                  By: /s/ JIM BRIDWELL
                                     ------------------------------------------
                                  Name:       Jim Bridwell
                                  Title:      Vice President

                                  UNION BANK OF CALIFORNIA, N.A.

                                  By: /s/ SEAN MURPHY
                                     ------------------------------------------
                                  Name: Sean Murphy
                                  Title: Assistant Vice President

                                  U.S. BANK NATIONAL ASSOCIATION

                                  By: /s/ M. WARD POLZIN
                                     ------------------------------------------
                                  Name:     M. Ward Polzin
                                  Title:    Vice President

<PAGE>

                                  WASHINGTON MUTUAL BANK, FA

                                  By:    /s/ MARK M. ISENSEE
                                     ------------------------------------------
                                  Name:      Mark M. Isensee
                                  Title:     Manager

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