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Geologic units in Deaf Smith county, Texas

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Ogallala Formation, alluvial and eolian deposits, and petrocalcic soils of the southern High Plains; Lower Pliocene to middle Miocene (locally includes unit Qoa)
Lithology: alluvium; eolian; carbonate
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 10 % of this area
Ogallala Formation
Lithology: sand; silt; clay or mud; gravel; carbonate
Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.2 % 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
sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.2 % of this area
sand dune deposits
Lithology: sand; silt
playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.9 % of this area
playa deposits
Lithology: clay or mud; silt
Chinle Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 4 % of this area
Chinle Formation
Lithology: fine-grained mixed clastic; sandstone
unnamed Pliocene deposits (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 0.4 % of this area
unnamed Pliocene deposits
Lithology: sand; gravel; silt
Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 84 % of this area
Blackwater Draw Formation
Lithology: sand; silt; clay or mud
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.3 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 0.2 % of this area
Dockum Group
Lithology: fine-grained mixed clastic; limestone; conglomerate
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
caliche deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
caliche deposits
Lithology: evaporite
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
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; limestone

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