Edwards Limestone
Quaternary deposit, undivided
Bouquillas Formation
Santa Elena Limestone
Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.
Austin Chalk
Buda Limestone; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.
Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Alluvium
Older alluvial deposits
Uvalde Gravel
Quaternary-Tertiary deposits, undivided
Alluvial fan deposits
Permian rocks, undivided
Playa deposits
Maxon Sandstone and Glen Rose Limestone, undivided