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Geologic units in Deaf Smith county, Texas

Chinle Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 32 % of this area

Chinle Formation

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 27 % of this area

Ogallala Formation

Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 24 % of this area

Blackwater Draw Formation

Lithology: sand; silt; clay or mud

playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 8 % of this area

playa deposits

Lithology: clay or mud; silt

unnamed Pliocene deposits (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 3 % of this area

unnamed Pliocene deposits

Lithology: sand; gravel; silt

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 2 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 2 % of this area

Dockum Group

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 1 % 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

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

sand dune deposits

Lithology: sand; silt

upper Chinle Group (Garita Creek, Trujillo, Bull Canyon, and Redonda Formations) (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

older alluvial deposits of upland plains and piedmont areas (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area

Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region; includes scattered lacustrine, playa, and alluvial deposits of the Tahoka, Double Tanks, Tule, Blanco, Blackwater Draw, and Gatuna Formations, the latter of which may be Pliocene at base; outcrops, however, are basically of Quaternary deposits; upper Quaternary to uppermost Pliocene(?)

Lithology: alluvium