Alluvium
Hueco Limestone
Alluvial fan deposits
Victorio Peak Formation
Finlay Limestone
Sand sheet deposits
Quaternary-Tertiary bolson deposits
Older alluvial deposits
Bolson deposits
Campagrande Formation
Cox Sandstone
Wilke Ranch Formation
Yucca Formation
Alkali flat deposits
Eagle Mountains caldera volcanic rocks
Dune sand sheet deposits
Cutoff Formation
Bluff Mesa Formation; Western part of Trans-Pecos Texas.
Oligocene intrusive rocks
Hazel Formation
Cretaceous rocks, undivided
Benevides Formation and Finlay Limestone, undivided
El Paso Formation and Bliss Sandstone, undivided
Allamore Formation
Espy Formation
Carrizo Mountain Group showing metasedimentary rocks
Bone Spring Formation
Fusselman Dolomite
Carrizo Mountain Group showing metaigneous rocks
Quitman Mountains caldera volcanic rocks and volcanic rocks of sneed (Cox) Mountain and west of Victoria Peak
Ojinaga Formation
Loma Plata Formation
Goat Seep Formation
Comanchean rocks, undivided
Buda Limestone and Eagle Mountain Sandstone, undivided
Montoya Dolomite
Mingus Formation
Van Horn Sandstone
Capitan Formation
Malone Formation
Land slide deposits
Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided
Eocene intrusive rocks
Rhyolite
Limestone and dolomite with minor shale. Guadalupian in south, in part Leonardian to north.
Briggs Formation
Alluvium
Torcer Formation
Etholen Conglomerate
Benevides 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.
Granite
Tarantula Gravel
Carlsbad Group
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.
Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers; and andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes. In the Latir field, fine-grained rhyolitic dikes commonly cut coarse-grained granitic plutons. Includes alkaline laccoliths, plugs, and dikes in Colfax County. North-trending dikes near Capitan include some mafic diabase dikes.
In Brokeoff Mountains only.
In northern Lea and Roosevelt Counties includes equivalents of Tucumcari Shale; in Cornudas Mountains includes Campogrande and Cox Formations and Washita Group; at Cerro de Cristo Rey includes several formations of the Fredricksburg and Washita Groups, and the Boquillas Formation (Cenomanian); in the southwest includes Mojado, U-Bar (Aptian), and Hell-to-Finish Formations, whch are equivalent to Bisbee Group of Arizona.
Basin facies - sandstone, limestone, and shale.
In Brokeoff Mountains only.
Boracho Limestone
Sandstone, gypsum, anhydrite, dolomite, and red mudstone.
Sandstones, siltstones, anhydrite, gypsum, halite, and dolomite.