Geologic units in Menard county, Texas

Edwards Limestone (Early Cretaceous) at surface, covers 84 % of this area

Edwards Limestone

Hensell Sand (Early Cretaceous; Comanchean Series) at surface, covers 8 % of this area

Hensell Sand

Alluvium (Holocene) at surface, covers 3 % of this area

Alluvium

Terrace deposits (Pleistocene and Holocene) at surface, covers 3 % of this area

Terrace deposits

Canyon Group, undivided (Late Pennsylvanian; Missouri Series) at surface, covers 1 % of this area

Canyon Group, undivided

Buda Limestone (Early Cretaceous) at surface, covers 0.3 % 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.

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

Quaternary deposit, undivided

Tanyard Formation (Early Ordovician) at surface, covers < 0.1 % of this area

Tanyard Formation

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

Permian rocks, undivided

Sparta Sand (Eocene) at surface, covers < 0.1 % of this area

Sparta Sand

Gorman Formation (Early Ordovician) at surface, covers < 0.1 % of this area

Gorman Formation

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

Antlers Sand