Geologic units in Gaines county, Texas

Sand sheet deposits (Holocene) at surface, covers 72 % of this area

Sand sheet deposits

Blackwater Draw Formation (Pleistocene) at surface, covers 16 % of this area

Blackwater Draw Formation

Ogallala Formation (Pliocene to Miocene) at surface, covers 6 % of this area

Ogallala Formation

Sand deposits, undivided (Holocene) at surface, covers 5 % of this area

Sand deposits, undivided

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 0.7 % of this area

Tahoka Formation

Sand dune deposits (Holocene) at surface, covers 0.3 % of this area

Sand dune deposits

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

Dune sand sheet deposits

Edwards Limestone (Early Cretaceous) at surface, covers < 0.1 % of this area

Edwards Limestone