Document:

Fifth Amendment to
                      Agreement of Limited Partnership of
                Geodyne Energy Income Limited Partnership III-B

      This Fifth Amendment to Agreement of Limited Partnership of Geodyne Energy
Income  Limited  Partnership  III-B (the  "Partnership")  is entered into by and
between  Geodyne  Resources,  Inc.  ("Resources"),  a Delaware  corporation,  as
successor General Partner, Geodyne Depositary Company ("Depositary"), a Delaware
corporation,  as the  Limited  Partner,  and all  Substituted  Limited  Partners
admitted to the Partnership.

      WHEREAS, on January 24, 1990, Geodyne Production Company  ("Geodyne"),  as
General Partner and Depositary  executed and entered into that certain Agreement
of Limited Partnership of the Partnership (the "Agreement"); and

      WHEREAS,  on February  25,  1993,  Geodyne  executed and entered into that
certain  First  Amendment  to the  Agreement of Limited  Partnership  whereby it
changed (i) the name of the Partnership from "PaineWebber/Geodyne  Energy Income
Partnership III-B" to "Geodyne Energy Income Limited  Partnership  III-B",  (ii)
the address of the  Partnership's  principal  place of  business,  and (iii) the
address for the Partnership's agent for service of process; and

      WHEREAS, on August 4, 1993, Geodyne executed and entered into that certain
Second  Amendment  to the  Agreement  of  Limited  Partnership  in  order to (i)
expedite the method of accepting  transfers of Unit  Holders' (as defined in the
Agreement)  Units in the  Partnership  and (ii) provide for an optional right of
repurchase/redemption which may be exercised by the Unit Holders; and

      WHEREAS,  on August 31,  1995,  Geodyne  executed  and  entered  into that
certain Third Amendment to the Agreement of Limited  Partnership whereby Section
8.1.A(ii)  of the  Agreement  was deleted in order to allow  transfers  of Units
facilitated  through a matching service to the extent that they otherwise comply
with Internal Revenue Service transfer  regulations  applicable to non-permitted
transfers for non-publicly traded limited partnerships; and

      WHEREAS,  on June 30, 1996,  Geodyne merged into Geodyne  Resources,  Inc.
("Resources"); and

      WHEREAS,  on  July  1,  1996,  Resources,   as  successor  via  merger  to
Properties,  executed and entered into, as General Partner,  that certain Fourth
Amendment  to the  Agreement  of Limited  Partnership  whereby  it  amended  the
Agreement to provide that Resources,  as successor via merger to Geodyne, is the
General Partner of the Partnership; and

                                      -1-
<PAGE>

      WHEREAS,  Section 2.3 of the Agreement provides that the Partnership shall
continue  in full  force and effect for a period of ten (10) years from the date
of its  Activation  (as  defined in the  Agreement),  provided  that the General
Partner  may extend the term of the  Partnership  for up to five  periods of two
years each if it believes  each such  extension is in the best  interests of the
Unit Holders or until  dissolution  prior thereto  pursuant to the provisions of
the Agreement, and

      WHEREAS,  Resources  as General  Partner has elected to extend the life of
the Partnership an additional two years.

      NOW,  THEREFORE,  in  consideration  of  the  covenants,   conditions  and
agreements herein contained, the parties hereto hereby agree as follows:

      Section 2.3. is hereby amended and restated as follows:

                  The  Partnership  shall  continue  in force and  effect  until
            January 25, 2002,  provided that the General  Partner may extend the
            term of the  Partnership for up to four periods of two years each if
            it believes  such  extension  is in the best  interests  of the Unit
            Holders,   or  until  dissolution  prior  thereto  pursuant  to  the
            provisions hereof.

      IN WITNESS WHEREOF, the parties hereto have hereunto set their hands as of
this 30th day of December, 1999.

                                    GEODYNE RESOURCES, INC.,
                                    as General Partner

                                    By:   // Dennis R. Neill //
                                          ---------------------
                                          Dennis R. Neill
                                          President

                                    GEODYNE DEPOSITARY COMPANY,
                                    as the Limited Partner

                                    By:   // Dennis R. Neill //
                                          ---------------------
                                          Dennis R. Neill
                                          President

                                    GEODYNE RESOURCES, INC.
                                    as Attorney-in-Fact for all
                                    Substituted Limited Partners

                                    By:   // Dennis R. Neill //
                                          ---------------------
                                          Dennis R. Neill
                                          President

                                      -2-Fifth Amendment to
                      Agreement of Limited Partnership of
                Geodyne Energy Income Limited Partnership III-C

      This Fifth Amendment to Agreement of Limited Partnership of Geodyne Energy
Income  Limited  Partnership  III-C (the  "Partnership")  is entered into by and
between  Geodyne  Resources,  Inc.  ("Resources"),  a Delaware  corporation,  as
successor General Partner, Geodyne Depositary Company ("Depositary"), a Delaware
corporation,  as the  Limited  Partner,  and all  Substituted  Limited  Partners
admitted to the Partnership.

      WHEREAS, on February 26, 1990, Geodyne Production Company ("Geodyne"),  as
General Partner, and Depositary executed and entered into that certain Agreement
of Limited Partnership of the Partnership (the "Agreement"); and

      WHEREAS,  on February  25,  1993,  Geodyne  executed and entered into that
certain  First  Amendment  to the  Agreement of Limited  Partnership  whereby it
changed (i) the name of the Partnership from "PaineWebber/Geodyne  Energy Income
Partnership III-C" to "Geodyne Energy Income Limited  Partnership  III-C",  (ii)
the address of the  Partnership's  principal  place of  business,  and (iii) the
address for the Partnership's agent for service of process; and

      WHEREAS, on August 4, 1993, Geodyne executed and entered into that certain
Second  Amendment  to the  Agreement  of  Limited  Partnership  in  order to (i)
expedite the method of accepting  transfers of Unit  Holders' (as defined in the
Agreement)  Units in the  Partnership  and (ii) provide for an optional right of
repurchase/redemption which may be exercised by the Unit Holders; and

      WHEREAS,  on August 31,  1995,  Geodyne  executed  and  entered  into that
certain Third Amendment to the Agreement of Limited  Partnership whereby Section
8.1.A(ii)  of the  Agreement  was deleted in order to allow  transfers  of Units
facilitated  through a matching service to the extent that they otherwise comply
with Internal Revenue Service transfer  regulations  applicable to non-permitted
transfers for non-publicly traded limited partnerships; and

      WHEREAS,  on June 30, 1996,  Geodyne merged into Geodyne  Resources,  Inc.
("Resources"); and

      WHEREAS,  on  July  1,  1996,  Resources,   as  successor  via  merger  to
Properties,  executed and entered into, as General Partner,  that certain Fourth
Amendment  to the  Agreement  of Limited  Partnership  whereby  it  amended  the
Agreement to provide that Resources,  as successor via merger to Geodyne, is the
General Partner of the Partnership; and

                                      -1-
<PAGE>

      WHEREAS,  Section 2.3 of the Agreement provides that the Partnership shall
continue  in full  force and effect for a period of ten (10) years from the date
of its  Activation  (as  defined in the  Agreement),  provided  that the General
Partner  may extend the term of the  Partnership  for up to five  periods of two
years each if it believes  each such  extension is in the best  interests of the
Unit Holders or until  dissolution  prior thereto  pursuant to the provisions of
the Agreement, and

      WHEREAS,  Resources  as General  Partner has elected to extend the life of
the Partnership an additional two years.

      NOW,  THEREFORE,  in  consideration  of  the  covenants,   conditions  and
agreements herein contained, the parties hereto hereby agree as follows:

      Section 2.3. is hereby amended and restated as follows:

                  The  Partnership  shall  continue  in force and  effect  until
            February 27, 2002,  provided that the General Partner may extend the
            term of the  Partnership for up to four periods of two years each if
            it believes  such  extension  is in the best  interests  of the Unit
            Holders,   or  until  dissolution  prior  thereto  pursuant  to  the
            provisions hereof.

      IN WITNESS WHEREOF, the parties hereto have hereunto set their hands as of
this 30th day of December, 1999.

                                    GEODYNE RESOURCES, INC.,
                                    as General Partner

                                    By:   // Dennis R. Neill //
                                          --------------------
                                          Dennis R. Neill
                                          President

                                    GEODYNE DEPOSITARY COMPANY,
                                    as the Limited Partner

                                    By:   // Dennis R. Neill //
                                          ---------------------
                                          Dennis R. Neill
                                          President

                                    GEODYNE RESOURCES, INC.
                                    as Attorney-in-Fact for all
                                    Substituted Limited Partners

                                    By:   // Dennis R. Neill //
                                          ---------------------
                                          Dennis R. Neill
                                          President

                                      -2-

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