EXHIBIT 20.1


                                September 6, 2001


TO:       Geodyne III-G Partnership Limited Partners

RE:       Extension of term of Partnership



Dear Limited Partner:

      As previously  described to you, the limited  partnership  agreement  (the
"Agreement")  for the Geodyne  Energy  Income  III-G  Limited  Partnership  (the
"Partnership")  provides that the Partnership will  automatically  terminate and
dissolve on  September  20, 2001.  The  Agreement  gives the General  Partner an
option to extend the term of the  Partnership for up to five additional two year
terms.

      The General Partner is hereby  notifying you that it has decided to extend
the term of the Partnership for an additional two year period. Accordingly,  the
new termination date for the Partnership will be September 20, 2003.

      If you have any questions  concerning the  Partnership's  extension please
contact Geodyne Investor Services at 918-583-1791 or 888-436-3963.

                                   Very truly yours,

                                   GEODYNE RESOURCES, INC.
                                   General Partner

                                    //s// Dennis R. Neill

                                   ------------------------------------
                                   Dennis R. Neill
                                   President