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Geologic units in Terry county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 65 % of this area

Blackwater Draw Formation

Sand sheet deposits (Holocene) at surface, covers 25 % of this area

Sand sheet deposits

Ogallala Formation (Pliocene to Miocene) at surface, covers 5 % of this area

Ogallala Formation

Sand deposits, undivided (Holocene) at surface, covers 3 % of this area

Sand deposits, undivided

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 1 % of this area

Tahoka Formation

Pond deposits (Pleistocene) at surface, covers 0.4 % of this area

Pond deposits

Sand dune deposits (Holocene) at surface, covers 0.3 % of this area

Sand dune deposits

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

Playa deposits

Edwards Limestone (Early Cretaceous) at surface, covers < 0.1 % of this area

Edwards Limestone