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Geologic units in Tom Green county, Texas

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 42 % 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

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

alluvium

Lithology: sand; silt; clay or mud; gravel

Antlers Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 11 % of this area

Antlers Sand

Lingos Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?) Pleistocene-Late(?) Holocene) at surface, covers 9 % of this area

Lingos Formation

Lithology: sand; gravel; clay or mud; silt

San Angelo Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 9 % of this area

San Angelo Formation

Blaine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 4 % of this area

Blaine Formation

Clear Fork Group (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 2 % of this area

Clear Fork Group

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 1 % of this area

Ogallala Formation

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 1 % of this area

Terrace deposits

Edwards Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.3 % of this area

Edwards Limestone

Buda Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area

Buda Limestone

Lithology: limestone

Whitehorse Group, undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area

Whitehorse Group, undivided

Lithology: sandstone; shale; evaporite

high gravel deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area

high gravel deposits

Lithology: gravel; silt; sand