Geologic units in Borden county, Texas

Dockum Group, undivided (Late Triassic) at surface, covers 54 % of this area

Dockum Group

Quaternary deposit, undivided (Quaternary) at surface, covers 19 % of this area

Quaternary deposit, undivided

Ogallala Formation (Pliocene to Miocene) at surface, covers 10 % of this area

Ogallala Formation

Blackwater Draw Formation (Pleistocene) at surface, covers 9 % of this area

Blackwater Draw Formation

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

Edwards Limestone and Antlers Sand, undivided (Early Cretaceous) at surface, covers 2 % of this area

Edwards Limestone and Antlers Sand, undivided

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided (Early Cretaceous) at surface, covers 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.

Sand sheet deposits (Holocene) at surface, covers 0.7 % of this area

Sand sheet deposits

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 0.6 % of this area

Lingos Formation

Playa deposits (Pleistocene and Holocene) at surface, covers 0.3 % of this area

Playa deposits

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

Terrace deposits