Geologic units in Andrews county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 41 % of this area

Blackwater Draw Formation

Sand sheet deposits (Holocene) at surface, covers 41 % of this area

Sand sheet deposits

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

Sand deposits, undivided

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

Ogallala Formation

Pond deposits (Pleistocene) at surface, covers 0.9 % of this area

Pond deposits

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

Tahoka Formation

Caliche deposits (Pleistocene and Holocene) at surface, covers 0.5 % of this area

Caliche deposits

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

Dune sand sheet deposits

Alluvium (Holocene) at surface, covers 0.2 % of this area

Alluvium

Sand dune deposits (Holocene) at surface, covers 0.2 % of this area

Sand dune deposits

Antlers Sand (Early Cretaceous) at surface, covers < 0.1 % of this area

Antlers Sand

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

Playa deposits

Older alluvial deposits (Pleistocene) at surface, covers < 0.1 % of this area

Older alluvial deposits

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

Edwards Limestone

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

Dockum Group