Pg. 29, 55-57, 63. North of Elm Fork a probable third dolomite member of Blaine formation, the Jester dolomite, was located at a number of places about midway between Haystack and Cedartop gypsums. This may eventually prove to be = Creta dolomite south of Elm Fork, or it may be older. It is a slightly platy medium- to fine-grained, gray to brownish-gray dolomite 9 to 24 inches thick. Age is Permian.
Type locality not stated. Exposed where road from Jester, Greer Co., southwestern OK, crosses the heavy gypsums at SE corner sec. 25, T. 7 N., R. 24 W. [Mapped.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1045).

Reduced in stratigraphic rank from member of Blaine Formation. Reassigned as a bed of the Elm Fork Member (first used) of Blaine Formation of El Reno Group. At the type locality (SE1/4 sec 26, T7N, R24W, Greer Co, OK, S. Oklahoma folded belt province), the bed is 0.8 ft thick, gray, fine crystalline to oolitic dolomite. Ranges between 0.2 to 0.8 ft thick in other measured sections. Overlies unnamed gray to red-brown shale interval. Underlies Cedartop Gypsum Bed. Cross sections. Occurs also in Jackson Co (Palo Duro basin) and in Beckham Co (Anadarko basin). Permian age.

Source: GNU records (USGS DDS-6; Denver GNULEX).