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Geologic units in Swisher county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 93 % of this area

Blackwater Draw Formation

Ogallala Formation (Pliocene to Miocene) at surface, covers 4 % of this area

Ogallala Formation

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

Playa deposits

Tule Formation (Pleistocene) at surface, covers 0.7 % of this area

Tule Formation

Sand dune deposits (Holocene) at surface, covers 0.2 % of this area

Sand dune deposits