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Geologic units in Hardeman county, Texas

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 21 % of this area
sand sheet deposits
Lithology: sand; silt
San Angelo Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 6 % of this area
San Angelo Formation
Lithology: mudstone; siltstone; evaporite
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
Clear Fork Group (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 6 % of this area
Clear Fork Group
Lithology: mudstone; sandstone; dolostone (dolomite); siltstone; evaporite
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 3 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
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 0.4 % of this area
WOODWARD- Lenticular and interfingering deposits of gravel, sand, silt, and clay. Generally light-tan to gray. Thickness along major streams ranges up to 100 feet and probably averages 40 feet; along minor streams the thickness ranges up to 45 feet and probably averages 20 feet. ENID- Sand, silt, clay, and locally gravel. Maximum thickness ranges from 30 to 80 feet (9 to 24 m) along major streams and from 0 to 60 feet (0 to 18 m) along minor streams. TULSA- Gravel, sand, silt, and clay. TULSA- Gravel, sand, silt, and clay. OKLAHOMA CITY- Sand, silt, clay, and lenticular beds of gravel. Thickness ranges from about 30 to 100 feet and probably averages about 50 feet along major streams. Along minor streams, thickness ranges from a few feet to about 50 feet and probably averages about 25 feet. LAWTON- Sand, clay, and gravel as much as 50 feet (15 m) thick; Shown only along major streams and tributaries . ARDMORE-SHERMAN- Gravel, sand, silt, and clay, including low terraces; thickness, about 25 to 100 feet. McALESTER TEXARKANA- Gravel, sand, silt, and clay, including low terraces about 30 feet above channels; thickness, about 50 feet along Little River and 110 feet along Red River
Lithology: alluvium
Blaine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 52 % of this area
Blaine Formation
Lithology: mudstone; evaporite; dolostone (dolomite); sandstone

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