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Geologic units in McMullen county, Texas

Catahoula Formation (Oligocene) at surface, covers 16 % of this area

Catahoula Formation

Alluvium (Holocene) at surface, covers 14 % of this area

Alluvium

Terrace deposits (Pleistocene and Holocene) at surface, covers 14 % of this area

Terrace deposits

Whitsett Formation (Oligocene and Eocene) at surface, covers 10 % of this area

Whitsett Formation

Manning, Wellborn, and Cadell Formations, undivided (Eocene) at surface, covers 10 % of this area

Manning, Wellborn, and Cadell Formations, undivided

Yegua Formation (Middle Eocene) at surface, covers 9 % of this area

Yegua Formation

Jackson Group, undivided (Oligocene and Eocene) at surface, covers 9 % of this area

Jackson Group, undivided

Frio Clay (Oligocene) at surface, covers 7 % of this area

Frio Clay

Fleming Formation and Oakville Sandstone, undivided (Miocene) at surface, covers 7 % of this area

Fleming Formation and Oakville Sandstone, undivided

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

Manning Formation

Goliad Formation (Miocene) at surface, covers 1 % of this area

Goliad Formation

Uvalde Gravel (Pliocene to Pleistocene) at surface, covers 0.3 % of this area

Uvalde Gravel

Wellborn Formation (Eocene) at surface, covers 0.3 % of this area

Wellborn Formation

Cadell Formation (Eocene) at surface, covers 0.1 % of this area

Cadell Formation

Sand sheet deposits (Holocene) at surface, covers < 0.1 % of this area

Sand sheet deposits