Named as a formation in the southern area of the Sapulpa group; named for the town of Skiatook, Tulsa Co, OK on the Chautauqua platform. No type locality designated. Occupies a wide zone in northwest part of Tulsa Co; extends southwest across southeast part of Osage Nation to the Arkansas River. This zone is 5 mi wide on the north but widens rapidly southwestward. Consists of shale in the greater part of the formation--about 150 ft thick immediately above the Lenapah limestone (new). In upper part of Skiatook are seen heavy beds of sandstone which thicken enormously from north to south. A limestone lens is best exposed at Lost City on the south side of the Arkansas River 6 mi above Tulsa--reaches 40 ft thick at the quarry. In northwestern part of the Claremore quad, Skiatook is 250-300 ft thick; along Arkansas River, is not less than 500 ft thick. Overlies a bed of dense, massive, bluish limestone, the southern extension of the Lenapah limestone of Sapulpa group; underlies Ramona formation (new) of Sapulpa group. Stratigraphic chart. Of Pennsylvanian age.

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