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Geologic units in Potter county, Texas

Ogallala Formation (Pliocene to Miocene) at surface, covers 38 % of this area

Ogallala Formation

Tecovas Formation (Late Triassic) at surface, covers 27 % of this area

Tecovas Formation

Blackwater Draw Formation (Pleistocene) at surface, covers 16 % of this area

Blackwater Draw Formation

Quartermaster Formation and Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 12 % of this area

Quartermaster Formation and Whitehorse Group, undivided

Trujillo Formation (Late Triassic) at surface, covers 4 % of this area

Trujillo Formation

Alluvium (Holocene) at surface, covers 1 % of this area

Alluvium

Dune sand sheet deposits (Holocene) at surface, covers 0.8 % of this area

Dune sand sheet deposits

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.5 % of this area

Terrace deposits

Quaternary deposit, undivided (Quaternary) at surface, covers 0.5 % of this area

Quaternary deposit, undivided

Playa deposits (Pleistocene and Holocene) at surface, covers 0.4 % of this area

Playa deposits

Sand sheet deposits (Holocene) at surface, covers 0.3 % of this area

Sand sheet deposits