Geologic units in Brazoria county, Texas

Alluvium (Holocene) at surface, covers 45 % of this area

Alluvium

Beaumont Formation, areas predominantly clay (Quaternary; Late Pleistocene) at surface, covers 28 % of this area

Beaumont Formation, areas predominantly clay

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 26 % of this area

Beaumont Formation, areas predominantly sand

Fill and spoil (Holocene) at surface, covers 0.6 % of this area

Fill and spoil

Barrier ridge and barrier flat deposts (Quaternary; Holocene) at surface, covers 0.5 % of this area

Barrier ridge and barrier flat deposts

Barrier island deposits (Quaternary) at surface, covers 0.1 % of this area

Barrier island deposits