Blackwater Draw Formation
Sand deposits, undivided
Sand sheet deposits
Double Lakes Formation
Sand dune deposits
Dune sand sheet deposits
Duck Creek Limestone
Duck Creek Limestone and Kiamichi Formation, undivided; Eastern part of Trans-Pecos and High Plains.
Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.
Includes scattered lacustrine, playa, and alluvial deposits of the Tahoka, Double Tanks, Tule, Blanco, Blackwater Draw, and Gatuna Formations, the latter of which may be Pliocene at base; outcrops, however, are basically of Quaternary deposits.
Includes associated alluvial and eolian deposits of major lake basins.