Geologic units in Briscoe county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 38 % of this area

Blackwater Draw Formation

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers 19 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 17 % of this area

Whitehorse Group, undivided

Dockum Group, undivided (Late Triassic) at surface, covers 7 % of this area

Dockum Group

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 7 % of this area

Lingos Formation

Ogallala Formation (Pliocene to Miocene) at surface, covers 5 % of this area

Ogallala Formation

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

Alluvium

Tule Formation (Pleistocene) at surface, covers 1 % of this area

Tule Formation

Sand sheet deposits (Holocene) at surface, covers 1 % of this area

Sand sheet deposits

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

Playa deposits

Dune sand sheet deposits (Holocene) at surface, covers 0.3 % of this area

Dune sand sheet deposits

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

Quaternary deposit, undivided

Sand dune deposits (Holocene) at surface, covers < 0.1 % of this area

Sand dune deposits

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

Terrace deposits