Document:

Fourth Amendment to
               Agreement and Certificate of Limited Partnership of
                 Geodyne Energy Income Limited Partnership III-C

     This Fourth  Amendment to Agreement and Certificate 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  ("Production"),
as General  partner,  and  Depositary  executed  and entered  into that  certain
Agreement  and  Certificate  of  Limited  Partnership  of the  Partnership  (the
"Agreement"); and

     WHEREAS,  on February 25, 1993,  Production  executed and entered into that
First  Amendment  to the  Agreement  whereby  it  changed  (i)  the  name of the
Partnership from  "PaineWebber/Geodyne  Energy Income Limited 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,  Production  executed  and  entered  into that
Second Amendment to the Agreement  whereby it amended certain  provisions to (i)
expedite  the  method  of  accepting  transfers  of Unit  Holders'  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,  Production  executed  and entered into that
Third Amendment to the Agreement whereby it amended certain  provisions to allow
transfers  of Units  facilitated  through a matching  service to the extent that
such  transfers   otherwise   comply  with  Internal  Revenue  Service  transfer
regulations  applicable  to  non-permitted  transfers  for  non-publicly  traded
limited partnerships; and

     WHEREAS, Section 11.1 of the Agreement provides that the general partner of
the partnership (the "General  Partner") may, without prior notice or consent of
any Unit  Holder (as  defined in the  Agreement),  amend any  provision  of this
Agreement if, in its opinion,  such amendment  does not have a material  adverse
effect upon the Unit Holders; and

      WHEREAS,   Production  merged  with  and  into  Geodyne  Resources,   Inc.
("Resources"), its parent corporation, effective June 30, 1996; and

     WHEREAS, Section 6.2 of the Agreement provides that the General Partner may
assign its General  Partner  Interest to a Person which shall become a successor
General Partner without the Consent of the Depositary,  if such assignment is in
connection with a merger; and

                                      -1-
<PAGE>

     WHEREAS,  as a result of the merger of Production  with and into Resources,
ownership  of the General  Partner  Interest in the  Partnership  is assigned to
Resources by operation of law; and

     WHEREAS,  as a result of the merger of Production  with and into Resources,
Resources  has  now  succeeded  to  the  position  of  General  Partner  of  the
Partnership; and

     WHEREAS,  Resources, as General Partner,  desires to amend the Agreement in
order to reflect Resources as the new General Partner.

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

      All references in the Agreement to Geodyne  Production  Company as General
      Partner are hereby amended to reflect, instead, Geodyne Resources, Inc. as
      General Partner.

       IN WITNESS  WHEREOF,  the parties hereto have hereunto set their hands as
of the 1st day of July, 1996.

                                       Geodyne Production Company
                                       by Geodyne Resources, Inc.
                                       as successor by merger

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

                                       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

                                      -2-
<PAGE>

                                       Geodyne Resources, Inc.,
                                       as Attorney-in-Fact for all
                                       Substituted Limited Partners

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

                                      -3-Fifth Amendment to
                      Agreement of Limited Partnership of
                Geodyne Energy Income Limited Partnership III-A

      This Fifth Amendment to Agreement of Limited Partnership of Geodyne Energy
Income  Limited  Partnership  III-A (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 November 17, 1989, 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-A" to "Geodyne Energy Income Limited  Partnership  III-A",  (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
            November 22, 2001,  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 15th day of November, 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

                                      -2-
<PAGE>

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

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

                                      -3-

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