Exhibit 4.30

                              Fourth Amendment to
                              Amended and Restated
                      Certificate of Limited Partnership of
                Geodyne Energy Income Limited Partnership II-C


     The undersigned,  desiring to amend its amended and restated  certificate
of limited  partnership  pursuant  to the  Oklahoma  Revised  Uniform  Limited
Partnership Act, as amended,  Okla.  Stat. tit. 54 (1993),  Section 301 et seq
(the "Act"), do hereby state:

1.  The  name of the  limited  partnership  is  Geodyne  Energy  Income  Limited
Partnership II-C.

2. The  dates of  filing  of the  Certificate  of  Limited  Partnership  and all
amendments thereto are as follows:

      Name                                                    Date
      Agreement and Certificate of Limited
            Partnership                                       1/14/88
      Amended and Restated Certificate of
            Limited Partnership                               3/10/89
      First Amendment to Amended and Restated
            Certificate of Limited Partnership                2/25/93
      Second Amendment to Amended and Restated
            Certificate of Limited Partnership                7/19/96
      Third Amendment to Amended and Restated
            Certificate of Limited Partnership                11/21/01

3.  The  Third  Amendment  to  Amended  and  Restated   Certificate  of  Limited
Partnership  dated November 14, 2001,  and filed with the Oklahoma  Secretary of
State on November 21,  2001,  stated that the latest date upon which the limited
partnership  is to dissolve is December  31,  2003.  Pursuant to its terms,  the
Agreement and  Certificate  of Limited  Partnership  dated January 13, 1988 (the
"Partnership  Agreement")  was amended on November 18,  2003,  to state that the
latest date upon which the  Partnership  is to dissolve  is December  31,  2005,
provided that the General  Partner may extend the term of the Partnership for up
to three additional  periods of two years each pursuant to the provisions of the
Partnership Agreement.

      Therefore,  the Amended and Restated Certificate of Limited Partnership is
hereby  revised  to state that the latest  date on which the  Partnership  is to
dissolve  is  December  31,  2005,  subject  to  extension  as set  forth in the
Partnership's Partnership Agreement.

      Dated:  November 21, 2003.

                                          GEODYNE RESOURCES, INC.
                                          General Partner


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