Geologic units in Nolan county, Texas

Edwards Limestone (Early Cretaceous) at surface, covers 43 % of this area

Edwards Limestone

Ogallala Formation (Pliocene to Miocene) at surface, covers 12 % of this area

Ogallala Formation

Antlers Sand (Early Cretaceous) at surface, covers 12 % of this area

Antlers Sand

Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 11 % of this area

Whitehorse Group, undivided

Quaternary deposit, undivided (Quaternary) at surface, covers 5 % of this area

Quaternary deposit, undivided

Dockum Group, undivided (Late Triassic) at surface, covers 4 % of this area

Dockum Group

Whitehorse Group and Blaine Formation, undivided (Permian; Guadalupe Series) at surface, covers 3 % of this area

Whitehorse Group and Blaine Formation, undivided

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

San Angelo Formation

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

Blaine Formation

Seymour Formation (Middle Pleistocene; Irvingtonian) at surface, covers 2 % of this area

Seymour Formation

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 1 % of this area

Lingos Formation

Alluvium (Holocene) at surface, covers 1 % of this area

Alluvium

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers 0.9 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.1 % of this area

Terrace deposits

Playa deposits (Pleistocene and Holocene) at surface, covers 0.1 % of this area

Playa deposits

Clear Fork Group (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Clear Fork Group