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Geologic units in Howard county, Texas

Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 0.4 % of this area
Dockum Group
Lithology: fine-grained mixed clastic; limestone; conglomerate
Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 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
Tahoka Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene [Wisconsinan]) at surface, covers 6 % of this area
Tahoka Formation
Lithology: clay or mud; silt; sand; gravel
sand deposits, undivided (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 4 % of this area
sand deposits, undivided
Lithology: sand; silt
sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.4 % of this area
sand dune deposits
Lithology: sand; silt
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 5 % of this area
sand sheet deposits
Lithology: sand; silt
playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.1 % of this area
playa deposits
Lithology: clay or mud; silt
Lingos Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?) Pleistocene-Late(?) Holocene) at surface, covers 4 % of this area
Lingos Formation
Lithology: sand; gravel; clay or mud; silt
Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 4 % of this area
Blackwater Draw Formation
Lithology: sand; silt; clay or mud
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.7 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 8 % of this area
Ogallala Formation
Lithology: sand; silt; clay or mud; gravel; carbonate
Edwards Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
Edwards Limestone
Lithology: limestone; dolostone (dolomite); chert
Antlers Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area
Antlers Sand
Lithology: sand; clay or mud; conglomerate; sandstone; claystone

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