Skip to main content

Geologic units in Dawson county, Texas

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 25 % 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

Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 19 % of this area

Blackwater Draw Formation

Lithology: sand; silt; clay or mud

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 16 % of this area

Ogallala Formation

sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 16 % of this area

sand sheet deposits

Lithology: sand; silt

sand deposits, undivided (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 12 % of this area

sand deposits, undivided

Lithology: sand; silt

Edwards Limestone and Antlers Sand, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 8 % of this area

Edwards Limestone and Antlers Sand, undivided

Tahoka Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene [Wisconsinan]) at surface, covers 3 % of this area

Tahoka Formation

Lithology: clay or mud; silt; sand; gravel

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

alluvium

Lithology: sand; silt; clay or mud; gravel

playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.6 % of this area

playa deposits

Lithology: clay or mud; silt

Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area

Dockum Group

sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

sand dune deposits

Lithology: sand; silt