Geologic units in Darlington county, South Carolina

Duplin Formation (Pliocene) at surface, covers 58 % of this area

Coastal terrace of Carolinas. Pliocene equivalent to Yorktown. Deeply weathered.

Bear Bluff Formation (Pliocene) at surface, covers 17 % of this area

One of the older coastal terrace sequences in the Carolinas. Equivalent to Windsor Fm.

Peedee Formation - Black Creek Group, undivided (Cretaceous) at surface, covers 11 % of this area

Peedee Formation - Black Creek Group, undivided

Alluvial Valley Swamp (Quaternary) at surface, covers 9 % of this area

Unconformable on all underlying units, fluvial sand and gravel at base, grading upwards into fine sands and silts, local peat. May be overrun with recent sediments from forest cutting and agriculture.

Socastee Formation (Pleistocene) at surface, covers 4 % of this area

Low coastal formation in Carolinas like Penholoway but younger and lower in altitude.