First published use as a bed in the Dog Creek Shale of the El Reno Group. Was named earlier (1967) by author in an unpublished thesis for exposures in SE1/4 sec 3, T2N, R24W at town of McQueen, Harmon Co, OK in the Palo Duro basin. Type section is in NW1/4 SW1/4 SE1/4 southeast to SE1/4 SW1/4 SE1/4 of sec 3. Two measured sections described. Is 4.5 ft thick at type where it is composed of a lower banded (white, red-brown, gray) gypsum separated from an upper gray very finely crystalline gypsum by a red-brown shale. Overlies some unnamed gray-green and red-brown shale at type where it is the uppermost unit measured. Ranges between 2 and 4 ft thick. Limited to the Hollis basin and areas south and west in TX. Thickens towards Childress and Cottle Cos, TX in the Palo Duro basin. Permian age.

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