Geologic units in Hampton county, South Carolina

Duplin Formation (Pliocene) at surface, covers 44 % of this area

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

Alluvial Valley Swamp (Quaternary) at surface, covers 13 % 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.

Penholoway Formation (Pleistocene) at surface, covers 13 % of this area

Similar to Cape May, broad lateral extent underlying terraces in the Carolinas; swamps and ridges on terrace surface were originally barrier islands and back bays. Superimposed on these landforms are swarms of Carolina bays.

Bear Bluff Formation (Pliocene) at surface, covers 12 % of this area

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

Waccamaw Formation (Pleistocene) at surface, covers 11 % of this area

Another Carolina costalized terrace of early-middle Pleistocene age. Deeply weathered.

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

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

Chenier plain and deltas of Suwannee & Chattahoochie Rivers (Holocene) at surface, covers 2 % of this area

Chenier plain and deltas of Suwannee & Chattahoochie Rivers

Stream alluvium (Quaternary) at surface, covers < 0.1 % of this area

Stream alluvium and undifferentiated terrace deposits