Geologic units in Fort Bend county, Texas

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 33 % of this area

Beaumont Formation, areas predominantly sand

Alluvium (Holocene) at surface, covers 32 % of this area

Alluvium

Beaumont Formation, areas predominantly clay (Quaternary; Late Pleistocene) at surface, covers 27 % of this area

Beaumont Formation, areas predominantly clay

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 8 % of this area

Lissie Formation