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Geologic units in Gray county, Texas

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 26 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Quartermaster Formation and Whitehorse Group, undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 24 % of this area

Quartermaster Formation and Whitehorse Group, undivided

dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 17 % of this area

dune sand sheet deposits

Lithology: sand; silt

sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 16 % of this area

sand sheet deposits

Lithology: sand; silt

playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 12 % of this area

playa deposits

Lithology: clay or mud; silt

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 4 % of this area

Terrace deposits

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 0.9 % of this area

Ogallala Formation

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

sand, silt, clay, and gravel. locally indurated with calcium carbonate (caliche); includes point bar, natural levee, stream channel, sand dune, terrace, alluvial fan, landslide bolson and playa deposits