Geologic units in Edwards county, Texas

Edwards Limestone (Early Cretaceous) at surface, covers 61 % of this area

Edwards Limestone

Devils River Limestone (Early Cretaceous; Comanchean Series) at surface, covers 25 % of this area

Devils River Limestone

Buda Limestone (Early Cretaceous) at surface, covers 5 % of this area

Buda Limestone; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

Salmon Peak Limestone (Early Cretaceous) at surface, covers 3 % of this area

Salmon Peak Limestone

Glen Rose Limestone (Early Cretaceous) at surface, covers 3 % of this area

Glen Rose Limestone

Buda Limestone and Del Rio Clay, undivided (Late Cretaceous) at surface, covers 1 % of this area

Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

Quaternary deposit, undivided (Quaternary) at surface, covers 1 % of this area

Quaternary deposit, undivided

Bouquillas Formation (Late Cretaceous) at surface, covers 0.4 % of this area

Bouquillas Formation

Alluvium (Holocene) at surface, covers 0.3 % of this area

Alluvium

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

Land slide deposits

Eagle Ford Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

Eagle Ford Formation

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Austin Chalk