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Geologic units in Lavaca county, Texas

Fleming Formation (Miocene) at surface, covers 30 % of this area

Fleming Formation

Goliad Formation (Miocene) at surface, covers 19 % of this area

Goliad Formation

Willis Formation (Pliocene) at surface, covers 15 % of this area

Willis Formation

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 14 % of this area

Lissie Formation

Oakville Sandstone (Miocene) at surface, covers 10 % of this area

Oakville Sandstone

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

Terrace deposits

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

Alluvium

Catahoula Formation (Oligocene) at surface, covers 0.8 % of this area

Catahoula Formation

Whitsett Formation (Oligocene and Eocene) at surface, covers 0.1 % of this area

Whitsett Formation