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Geologic units in Houston county, Texas

Yegua Formation (Middle Eocene) at surface, covers 31 % of this area

Yegua Formation

Cook Mountain Formation (Eocene) at surface, covers 21 % of this area

Cook Mountain Formation

Sparta Sand (Eocene) at surface, covers 17 % of this area

Sparta Sand

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

Alluvium

Weches Formation (Eocene) at surface, covers 4 % of this area

Weches Formation

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

Queen City Sand

Terrace deposits (Pleistocene and Holocene) at surface, covers 4 % of this area

Terrace deposits

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

Cadell Formation

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

Beaumont Formation, areas predominantly sand

Wellborn Formation (Eocene) at surface, covers 0.8 % of this area

Wellborn Formation

Deweyville Formation (Quaternary; Pleistocene and Holocene?) at surface, covers 0.5 % of this area

Deweyville Formation

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

Manning Formation