Geologic units in Howard county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 31 % of this area

Blackwater Draw Formation

Dockum Group, undivided (Late Triassic) at surface, covers 19 % of this area

Dockum Group

Quaternary deposit, undivided (Quaternary) at surface, covers 13 % of this area

Quaternary deposit, undivided

Ogallala Formation (Pliocene to Miocene) at surface, covers 8 % of this area

Ogallala Formation

Edwards Limestone (Early Cretaceous) at surface, covers 6 % of this area

Edwards Limestone

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 6 % of this area

Tahoka Formation

Sand sheet deposits (Holocene) at surface, covers 5 % of this area

Sand sheet deposits

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 4 % of this area

Lingos Formation

Sand deposits, undivided (Holocene) at surface, covers 4 % of this area

Sand deposits, undivided

Antlers Sand (Early Cretaceous) at surface, covers 1 % of this area

Antlers Sand

Alluvium (Holocene) at surface, covers 1 % of this area

Alluvium

Sand dune deposits (Holocene) at surface, covers 0.4 % of this area

Sand dune deposits

Playa deposits (Pleistocene and Holocene) at surface, covers 0.1 % of this area

Playa deposits