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Geologic units in Dallam county, Texas

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.2 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 17 % of this area
Ogallala Formation
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
Dakota and Purgatoir Formations, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Dakota and Purgatoir Formations, undivided
Lithology: sandstone; shale; coal
playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.2 % of this area
playa deposits
Lithology: clay or mud; silt
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 40 % of this area
sand sheet deposits
Lithology: sand; silt
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.5 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 1 % of this area
dune sand sheet deposits
Lithology: sand; silt
eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Eolian deposits
Lithology: eolian
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
CIMARRON- Generally semiconsolidated clay, silt, sand, gravel, and caliche 0 to 400 feet thick. BEAVER- Interbedded sand, siltstone, clay, gravel lenses, and thin limestone. Caliche common near surface but occurrence is not limited to the surface. Caliche accounts for most of the white color in the Ogallala. Other colors generally light tan or buff but locally may be pastel shades of almost any color. The Laverne and Rexroad Formations of Pliocene age and the Meade Group and Odee (of local usage) and other formations of Pleistocene age occur locally and are included with the Ogallala Formation, 0-700 feet thick. WOODWARD- Gravel, sand, silt, clay, caliche, and limestone, locally cemented with calcium carbonate. Generally light-tan to gray to white. Thickness ranges up to 400 feet and probably averages 150 feet. CLINTON- Gray to light-brown, fine- to medium-grained sand with some, clay, silt, gravel, volcanic ash, and caliche beds; locally cemented by calcium carbonate. Thickness ranges from 0 to about 320 feet. The formation thins eastward.
Lithology: sand; siltstone; clay or mud; gravel; limestone; volcanic ash
Dakota Formation (Phanerozoic | Mesozoic | Cretaceous-Early Cretaceous-Late) at surface, covers < 0.1 % of this area
Dakota Formation
Lithology: sandstone; shale; coal
Morrison Formation (Phanerozoic | Mesozoic | Jurassic-Late) at surface, covers < 0.1 % of this area
Morrison Formation
Lithology: shale; sandstone
Dune Sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
CIMARRON- Fine- to medium-grained sand 0 to 40 feet thick. TEXAS- Fine to coarse windblown sand. Maximum thickness about 30 feet. BEAVER- Fine to coarse, round to sub-round, windblown sand consisting mostly of quartz grains. 0-50 feet thick
Lithology: sand
Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 41 % of this area
Blackwater Draw Formation
Lithology: sand; silt; clay or mud

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Page Last modified: 11:25 on 07-Jan-2014