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Geologic units in Oldham county, Texas

Ogallala Formation (Pliocene to Miocene) at surface, covers 27 % of this area

Ogallala Formation

Tecovas Formation (Late Triassic) at surface, covers 22 % of this area

Tecovas Formation

Trujillo Formation (Late Triassic) at surface, covers 20 % of this area

Trujillo Formation

Blackwater Draw Formation (Pleistocene) at surface, covers 17 % of this area

Blackwater Draw Formation

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

Chinle Formation

Sand sheet deposits (Holocene) at surface, covers 3 % of this area

Sand sheet deposits

Quartermaster Formation and Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 2 % of this area

Quartermaster Formation and Whitehorse Group, undivided

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

Alluvium

Rita Blanca Formation (Pliocene) at surface, covers 1 % of this area

Rita Blanca Formation

Terrace deposits (Pleistocene and Holocene) at surface, covers 1 % of this area

Terrace deposits

Sand deposits, undivided (Holocene) at surface, covers 0.8 % of this area

Sand deposits, undivided

Quaternary deposit, undivided (Quaternary) at surface, covers 0.4 % of this area

Quaternary deposit, undivided

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

Dune sand sheet deposits

Playa deposits (Pleistocene and Holocene) at surface, covers 0.3 % of this area

Playa deposits

Caliche deposits (Pleistocene and Holocene) at surface, covers 0.2 % of this area

Caliche deposits