Duplin Formation

Coastal terrace of Carolinas. Pliocene equivalent to Yorktown. Deeply weathered.
State South Carolina
Name Duplin Formation
Geologic age Pliocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sandsands, sandy and silty clays, and very shelly sands, which frequently overlie a phosphatic basal conglomerate
Unconsolidated > Fine-detrital > Claysands, sandy and silty clays, and very shelly sands, which frequently overlie a phosphatic basal conglomerate
Minor
Sedimentary > Clastic > Conglomeratesands, sandy and silty clays, and very shelly sands, which frequently overlie a phosphatic basal conglomerate
Comments Secondary unit description from USGS Lexicon (ref.SC003): Duplin beds consist of sands, sandy and silty clays, and very shelly sands, which frequently overlie a phosphatic basal conglomerate.
References

Newell, Wayne L., Prowell, David (retired), Krantz, David, Powars, David, Mixon, Robert (retired), Stone, Byron, and Willard, Debra, in review, Surficial Geology and Geomorphology of the Atlantic Coastal Plain: USGS Open File Report, in press.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search

Counties Allendale - Bamberg - Barnwell - Calhoun - Chesterfield - Clarendon - Colleton - Darlington - Dillon - Dorchester - Florence - Hampton - Jasper - Lee - Marlboro - Orangeburg - Richland - Sumter