Geologic units in Lee county, South Carolina

Peedee Formation - Black Creek Group, undivided (Cretaceous) at surface, covers 39 % of this area

Peedee Formation - Black Creek Group, undivided

Duplin Formation (Pliocene) at surface, covers 30 % of this area

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

Bear Bluff Formation (Pliocene) at surface, covers 19 % of this area

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

Alluvial Valley Swamp (Quaternary) at surface, covers 12 % 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.