Geologic units in Terrell county, Texas

Edwards Limestone (Early Cretaceous) at surface, covers 51 % of this area

Edwards Limestone

Quaternary deposit, undivided (Quaternary) at surface, covers 12 % of this area

Quaternary deposit, undivided

Bouquillas Formation (Late Cretaceous) at surface, covers 11 % of this area

Bouquillas Formation

Santa Elena Limestone (Early Cretaceous) at surface, covers 10 % of this area

Santa Elena Limestone

Buda Limestone and Del Rio Clay, undivided (Late Cretaceous) at surface, covers 6 % 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.

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area

Austin Chalk

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.

Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Early Cretaceous) at surface, covers 0.2 % of this area

Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Alluvium

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

Older alluvial deposits

Uvalde Gravel (Pliocene to Pleistocene) at surface, covers < 0.1 % of this area

Uvalde Gravel

Quaternary-Tertiary deposits, undivided (Pliocene to Pleistocene) at surface, covers < 0.1 % of this area

Quaternary-Tertiary deposits, undivided

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

Alluvial fan deposits

Permian rocks, undivided (Permian) at surface, covers < 0.1 % of this area

Permian rocks, undivided

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

Playa deposits

Maxon Sandstone and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Maxon Sandstone and Glen Rose Limestone, undivided