Geologic units in Lynn county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 74 % of this area

Blackwater Draw Formation

Sand sheet deposits (Holocene) at surface, covers 13 % of this area

Sand sheet deposits

Ogallala Formation (Pliocene to Miocene) at surface, covers 7 % of this area

Ogallala Formation

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 4 % of this area

Tahoka Formation

Sand dune deposits (Holocene) at surface, covers 0.5 % of this area

Sand dune deposits

Tule Formation (Pleistocene) at surface, covers 0.3 % of this area

Tule Formation

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided (Early Cretaceous) at surface, covers 0.3 % of this area

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided; North, central, and south Texas including Quaternary for all of west Texas.

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

Playa deposits

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

Quaternary deposit, undivided

Dockum Group, undivided (Late Triassic) at surface, covers 0.2 % of this area

Dockum Group

Kiamichi Formation (Early Cretaceous; Comanchean Series) at surface, covers 0.1 % of this area

Kiamichi Formation

Duck Creek Limestone and Kiamichi Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Duck Creek Limestone and Kiamichi Formation, undivided; Eastern part of Trans-Pecos and High Plains.