An informal name applied to a 100-ft sand zone at the base of the Cotton Valley formation (first? used) in subsurface of the Schuler pool, Union Co, AR in the Arkla basin. Unconformably above the Reynolds oolite, an informally named unit at the top of the Smackover limestone (first used). Underlies unnamed gray shale of the Cotton Valley. Consists of a basal part that is dense, calcareous shaly sand with scattered pebbles in lower few ft and an upper porous sand. Columnar section. Mesozoic age.

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

Identified in well cuttings in the Bossier formation (new), lower formation of the Cotton Valley group (rank raised), from the Lion Oil Refining Co. and Phillips Petroleum Co. Edna Morgan No. 1, C NE SW sec 18, T18S, R17W, Union Co, AR in the Arkla basin. Name applied to two sandstones--1) a 15 ft thick light-gray fine-grained oil-stained sandstone at the base of the Bossier, and 2) a 75 ft thick white and gray, fine-grained sandstone that is separated from the lower sandstone by 10 ft of dark-gray shale. The lower sandstone is underlain by the Smackover formation. The upper sandstone is overlain by dark-gray pyritic shale and interbedded very fine grained white sandstone of the upper part of the Bossier. Late Jurassic age.

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