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Geologic units in Stonewall county, Texas

Blaine Formation (Permian; Guadalupe Series) at surface, covers 45 % of this area

Blaine Formation

Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 27 % of this area

Whitehorse Group, undivided

Sand sheet deposits (Holocene) at surface, covers 10 % of this area

Sand sheet deposits

San Angelo Formation (Permian; Guadalupe Series) at surface, covers 7 % of this area

San Angelo Formation

Clear Fork Group (Permian; Leonard Series) at surface, covers 4 % of this area

Clear Fork Group

Alluvium (Holocene) at surface, covers 3 % of this area

Alluvium

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

Terrace deposits

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 2 % of this area

Lingos Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 0.2 % of this area

Quaternary deposit, undivided

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Dockum Group, undivided (Late Triassic) at surface, covers < 0.1 % of this area

Dockum Group

Dune sand sheet deposits (Holocene) at surface, covers < 0.1 % of this area

Dune sand sheet deposits

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided; North, central, and south Texas including Quaternary for all of west Texas.