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Geologic units in Walker county, Texas

Fleming Formation (Miocene) at surface, covers 28 % of this area

Fleming Formation

Willis Formation (Pliocene) at surface, covers 19 % of this area

Willis Formation

Catahoula Formation (Oligocene) at surface, covers 18 % of this area

Catahoula Formation

Alluvium (Holocene) at surface, covers 10 % of this area

Alluvium

Manning Formation (Eocene) at surface, covers 7 % of this area

Manning Formation

Whitsett Formation (Oligocene and Eocene) at surface, covers 7 % of this area

Whitsett Formation

Wellborn Formation (Eocene) at surface, covers 5 % of this area

Wellborn Formation

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 2 % of this area

Beaumont Formation, areas predominantly sand

Deweyville Formation (Quaternary; Pleistocene and Holocene?) at surface, covers 2 % of this area

Deweyville Formation

Cadell Formation (Eocene) at surface, covers 1 % of this area

Cadell Formation

Yegua Formation (Middle Eocene) at surface, covers 0.9 % of this area

Yegua Formation

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.6 % of this area

Terrace deposits