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Peedee Formation

Peedee Formation
StateSouth Carolina
NamePeedee Formation
Geologic ageCretaceous
Original map labelKpd
CommentsSecondary unit description from USGS Lexicon (ref.SC003): Named for exposures on Great Peedee River. Type locality at Burches Ferry, west side Peedee River, S.C. Occurs in Coastal Plain of eastern South Carolina and North Carolina. Consists of dark-green or gray, finely micaceous, more or less glauconitic and argillitic sand, many layers of which are calcareous (impure limestone). Irregular concretionary masses of impure calcium carbonate occur in places. Dark marine clays are interstratified with sand. Thickness is 0 to 886 ft. Unconformably overlies Black Creek formation; unconformably overlain by Quaternary or Tertiary deposits. Age is Late Cretaceous (based on fossils BELEMNITES and EXOGYRA COSTATA). Rocky Point Member is the uppermost Cretaceous unit in southeastern Brunswick Co. and north central New Hanover Co. Rocky Point is a gray, sandy, moldic limestone. Uppermost part commonly contains abundant phosphorite. Planktic foraminiferal zonation indicates a late but not latest Maastrichtian age.
Primary rock typesand
Secondary rock typelimestone
Other rock types
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sandglauconitic to argillic sand
Minor
Sedimentary > Carbonate > Limestoneimpure limestone
Map 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: U.S.G.S. Open File Report,
Unit 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: U.S.G.S. Open File Report,
USGS Geologic Names Lexicon (GEOLEX)
Geographic coverageAiken

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