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Geologic units in Hall county, Texas

Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 63 % of this area

Whitehorse Group, undivided

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 15 % of this area

Lingos Formation

Alluvium (Holocene) at surface, covers 6 % of this area

Alluvium

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers 5 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Dune sand sheet deposits (Holocene) at surface, covers 3 % of this area

Dune sand sheet deposits

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

Sand sheet deposits

Blaine Formation (Permian; Guadalupe Series) at surface, covers 2 % of this area

Blaine Formation

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

Quaternary deposit, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.5 % of this area

Terrace deposits

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

Playa deposits

Ogallala Formation (Pliocene to Miocene) at surface, covers < 0.1 % of this area

Ogallala Formation