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Geologic units in Guadalupe county, Texas

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers 32 % of this area

Wilcox Group, undivided

Leona Formation (Pleistocene) at surface, covers 18 % of this area

Leona Formation

Navarro Group and Marlbrook Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers 15 % of this area

Navarro Group and Marlbrook Marl, undivided

Carizzo Sand (Eocene) at surface, covers 10 % of this area

Carizzo Sand

Terrace deposits (Pleistocene and Holocene) at surface, covers 6 % of this area

Terrace deposits

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 6 % of this area

Pecan Gap Chalk

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

Reklaw Formation (Eocene) at surface, covers 4 % of this area

Reklaw Formation

Midway Group, undivided (Paleocene) at surface, covers 3 % of this area

Midway Group, undivided

Willis Formation (Pliocene) at surface, covers 3 % of this area

Willis Formation

Queen City Sand (Eocene) at surface, covers 0.3 % of this area

Queen City Sand

Edwards Limestone (Early Cretaceous) at surface, covers 0.1 % of this area

Edwards Limestone