Alluvium
Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation
Bofecillos volcano volcanic rocks, including units 1-8 of Rawls Formation and lava flows in upper part of Fresno Formation
Chinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt
Quaternary-Tertiary bolson deposits
Alluvial fan deposits
Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia
Older alluvial deposits
Infiernito caldera volcanic rocks including Capote Mountain Tuff, Tsh2 of Shely Group, Buckshot Ignimbrite, and Tm1 of Morita Ranch Formation
Jones Basalt
El Picacho Formation
Oligocene intrusive rocks
Duff Formation (with Decie Member from Paisano caldera shown separaetly), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided
Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area)
Upper part of Shely Group, including Tm4 or Morita Ranch Formation
Duff Formation, Decie Member from Paisano caldera
Devils Graveyard volcanic rocks
Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided
Younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations
Santana Tuff from Sierra Rica caldera in Mexico
San Carlos Sandstone
Bluff Mesa Formation; Western part of Trans-Pecos Texas.
Bouquillas Formation
Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Ojinaga Formation
Eocene intrusive rocks
Shafter Formation
Tarantula Gravel
Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided
Santa Elena Limestone
Pinto Canyon Formation
Cox Sandstone
Yucca Formation
Maxon Sandstone and Glen Rose Limestone, undivided
Alta Formation
Del Carmen Limestone
Quaternary-Tertiary deposits, undivided
Presidio Formation
Black Gap area volcanic rocks
Loma Plata Formation
Benevides Formation and Finlay Limestone, undivided
Cienequita Formation
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.
Sand deposits, undivided
Ross Mine Formation
Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided
Tesnus Formation
Pen Formation
Eocene volcanic rocks
Ordovician rocks, undivided
Mina Grande Formation
Sue Peaks Formation
Cibolo Formation
San Carlos Tuff from San Carlos caldera in Mexico
Mississippi, Devonian, and Ordovician rocks, undivided
Land slide deposits
Tertiary intrusive rocks, undivided
Dimple Formation
Miocene intrusive rocks
Finlay Limestone
Haymond Formation
Older volcanic rocks of Davis and Barilla Mountains, including Sheep Pasture, Sleeping Lion, Frazier Canyon, Adobe Canyon, and Limpia formations, Gomez Tuff, Star Mountain Rhyolite, and Huelster Formation