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Geologic units in Randall county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 76 % of this area

Blackwater Draw Formation

Ogallala Formation (Pliocene to Miocene) at surface, covers 14 % of this area

Ogallala Formation

Unnamed Pliocene deposits (Pliocene) at surface, covers 3 % of this area

Unnamed Pliocene deposits

Dockum Group, undivided (Late Triassic) at surface, covers 3 % of this area

Dockum Group

Playa deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Playa deposits

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers 1 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Alluvium (Holocene) at surface, covers 0.7 % of this area

Alluvium

Sand dune deposits (Holocene) at surface, covers < 0.1 % of this area

Sand dune deposits