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  5. Texas geologic units

Geologic units in Crosby county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 60 % of this area

Blackwater Draw Formation

Dockum Group, undivided (Late Triassic) at surface, covers 14 % of this area

Dockum Group

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

Ogallala Formation

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

Lingos Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 2 % of this area

Quaternary deposit, undivided

Sand sheet deposits (Holocene) at surface, covers 2 % of this area

Sand sheet deposits

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

Quartermaster Formation; North and central Texas including panhandle.

Playa deposits (Pleistocene and Holocene) at surface, covers 1 % of this area

Playa deposits

Alluvium (Holocene) at surface, covers 0.4 % of this area

Alluvium

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

Sand dune deposits

Blanco Formation (Pliocene) at surface, covers 0.3 % of this area

Blanco Formation

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.2 % of this area

Terrace deposits