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Geologic units in Atascosa county, Texas

Yegua Formation (Middle Eocene) at surface, covers 17 % of this area

Yegua Formation

Cook Mountain Formation (Eocene) at surface, covers 17 % of this area

Cook Mountain Formation

Queen City Sand (Eocene) at surface, covers 14 % of this area

Queen City Sand

Carizzo Sand (Eocene) at surface, covers 9 % of this area

Carizzo Sand

Manning, Wellborn, and Cadell Formations, undivided (Eocene) at surface, covers 8 % of this area

Manning, Wellborn, and Cadell Formations, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 8 % of this area

Terrace deposits

Alluvium (Holocene) at surface, covers 6 % of this area

Alluvium

Whitsett Formation (Oligocene and Eocene) at surface, covers 6 % of this area

Whitsett Formation

Sparta Sand (Eocene) at surface, covers 4 % of this area

Sparta Sand

Reklaw Formation (Eocene) at surface, covers 3 % of this area

Reklaw Formation

Manning Formation (Eocene) at surface, covers 3 % of this area

Manning Formation

Weches Formation (Eocene) at surface, covers 2 % of this area

Weches Formation

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers 2 % of this area

Wilcox Group, undivided

Cadell Formation (Eocene) at surface, covers 0.7 % of this area

Cadell Formation

Wellborn Formation (Eocene) at surface, covers 0.5 % of this area

Wellborn Formation

Catahoula Formation (Oligocene) at surface, covers < 0.1 % of this area

Catahoula Formation

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

Uvalde Gravel