Qu
Undivided terrace, slope-wash, and fan deposits (Quaternary)
Qt
Terrace deposits (Quaternary)
Kgru
upper Glen Rose Limestone (Lower Cretaceous)
Kdvrl
lower Devils River Formation, informal (Lower Cretaceous)
Kft
Fort Terrett Formation (Lower Cretaceous)
Qal
Alluvium (Quaternary)
Kdvru
upper Devils River Formation, informal (Lower Cretaceous)
Kbu
Buda Limestone (Upper Cretaceous)
Qle
Leona Formation (Pleistocene)
Kdr
Del Rio Clay (Upper Cretaceous)
Kau
Austin Group (Upper Cretaceous)
Kef
Eagle Ford Group (Upper Cretaceous)
Kan
Anacacho Formation (Upper Cretaceous)
Kan+Kau
Anacacho Formation (Upper Cretaceous) and Austin Group (Upper Cretaceous), undivided
Qtu
Uvalde gravel (Quaternary and Upper Tertiary)
Kes
Escondido Formation (Upper Cretaceous)
Ki
Intrusive igneous rocks (Upper Cretaceous)