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  5. Texas geologic units

Geologic units in Colorado county, Texas

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 31 % of this area

Lissie Formation

Willis Formation (Pliocene) at surface, covers 30 % of this area

Willis Formation

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

Alluvium

Fleming Formation (Miocene) at surface, covers 14 % of this area

Fleming Formation

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 5 % of this area

Beaumont Formation, areas predominantly sand

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

Terrace deposits

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

Beaumont Formation, areas predominantly clay

Goliad Formation (Miocene) at surface, covers 0.2 % of this area

Goliad Formation