Geologic units in Lamb county, Texas

Blackwater Draw Formation (Pleistocene) at surface, covers 73 % of this area

Blackwater Draw Formation

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

Sand deposits, undivided

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

Ogallala Formation

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 1 % of this area

Tahoka Formation

Sand sheet deposits (Holocene) at surface, covers 0.8 % of this area

Sand sheet deposits

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

Sand dune deposits

Double Lakes Formation (Pleistocene; Early Wisconsinan) at surface, covers 0.6 % of this area

Double Lakes Formation

Duck Creek Limestone and Kiamichi Formation, undivided (Early Cretaceous) at surface, covers 0.3 % of this area

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

Playa deposits (Pleistocene and Holocene) at surface, covers 0.2 % of this area

Playa deposits

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

Kiamichi Formation

Duck Creek Limestone (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Duck Creek Limestone