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Geologic units in Sterling county, Texas

Edwards Limestone (Early Cretaceous) at surface, covers 53 % of this area

Edwards Limestone

Quaternary deposit, undivided (Quaternary) at surface, covers 26 % of this area

Quaternary deposit, undivided

Antlers Sand (Early Cretaceous) at surface, covers 6 % of this area

Antlers Sand

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 6 % of this area

Lingos Formation

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

Dockum Group, undivided (Late Triassic) at surface, covers 3 % of this area

Dockum Group

Ogallala Formation (Pliocene to Miocene) at surface, covers 2 % of this area

Ogallala Formation

Blackwater Draw Formation (Pleistocene) at surface, covers 0.4 % of this area

Blackwater Draw Formation

Playa deposits (Pleistocene and Holocene) at surface, covers < 0.1 % of this area

Playa deposits

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Quartermaster Formation; North and central Texas including panhandle.