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Geologic units in Hardeman county, Texas

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.6 % 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
Lithology: sand ; silt ; clay or mud; gravel; carbonate
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.5 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 19 % of this area
sand sheet deposits
Lithology: sand; silt
dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 12 % of this area
dune sand sheet deposits
Lithology: sand; silt
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 3 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
San Angelo Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 6 % of this area
San Angelo Formation
Lithology: mudstone; siltstone; evaporite
Clear Fork Group (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 6 % of this area
Clear Fork Group
Lithology: mudstone; sandstone; dolostone (dolomite); siltstone; evaporite
Blaine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 48 % of this area
Blaine Formation
Lithology: mudstone; evaporite; dolostone (dolomite); sandstone

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