Geologic units in Florence county, South Carolina

Waccamaw Formation (Pleistocene) at surface, covers 40 % of this area

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

Bear Bluff Formation (Pliocene) at surface, covers 39 % of this area

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

Alluvial Valley Swamp (Quaternary) at surface, covers 21 % 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 0.6 % 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.

Duplin Formation (Pliocene) at surface, covers < 0.1 % of this area

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