Is a sandy unit in the upper part of the Steele Shale called Cow Creek sandstone member in reports. Has been informally called Cow Creek sandstone (unranked) for development in Sohio Oil Co. Cow Creek Unit Well No. 1 in sec 12, T16N, R92W, Carbon Co, WY, Greater Green River basin. Occurs between 3,890 ft and 4,240 ft in Cow Creek well and between 3,180 ft and 3,460 ft in Deep Creek Unit well. Present on outcrop. Can be traced east from Hatfield Dome. Includes glauconitic sandstone, silty shale, and calcareous [Lithologic description and sequence vaguely stated]. Abundant ammonite fauna found in calcareous concretions. Member assigned an early Claggett, Late Cretaceous or Campanian age.

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