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  5. Texas geologic units

Geologic units in Duval county, Texas

Goliad Formation (Miocene) at surface, covers 56 % of this area

Goliad Formation

Catahoula Formation (Oligocene) at surface, covers 14 % of this area

Catahoula Formation

Fleming Formation and Oakville Sandstone, undivided (Miocene) at surface, covers 12 % of this area

Fleming Formation and Oakville Sandstone, undivided

Sand sheet deposits (Holocene) at surface, covers 5 % of this area

Sand sheet deposits

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 4 % of this area

Lissie Formation

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

Alluvium

Frio Clay (Oligocene) at surface, covers 3 % of this area

Frio Clay

Jackson Group, undivided (Oligocene and Eocene) at surface, covers 0.9 % of this area

Jackson Group, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.9 % of this area

Terrace deposits

Quaternary deposit, undivided (Quaternary) at surface, covers 0.8 % of this area

Quaternary deposit, undivided