Coastal & Marine Geology Program > South Carolina Coastal Erosion Study > Open File Report 2004-1013

Maps Showing the Stratigraphic Framework of South Carolina's Long Bay from Little River to Winyah Bay

USGS Open File Report 2004-1013

by: Wayne E. Baldwin, Robert A. Morton, Jane F. Denny, Shawn V. Dadisman William, C. Schwab, Paul T. Gayes, and Neal W. Driscoll

Introduction Setting Geophysical Data: Acquisition Processing & Interpretation Mapping Results: Bathymetry & Sidescan Sonar Seismic Stratigraphy Summary Acknowledg- ments References List of Figures Disclaimer

Seismic Stratigraphy Introduction Cretaceous and Tertiary Shelf Deposits Paleochannel Incision Distribution and Fill Thickness Regionally Defined Transgressive Unconformity Thickness and Distribution of Modern Sediment Introduction Seismic stratigraphic analysis of the seismic reflection data identified three main units: Cretaceous and Tertiary continental shelf strata, deposits of unknown age that fill an extensive system of ancient paleochannels, and modern (Pleistocene and younger) surficial sediment accumulations. A regionally defined transgressive unconformity separates lithified underlying continental shelf strata and paleochannel fill, from overlying unconsolidated marine sediment. Paleochannels are present both above and below this unconformity, indicating that the ages and origins of the incisions and fill vary significantly. continue to Mapping Results: Seismic Stratigraphy - Cretaceous and Tertiary Shelf Deposits Introduction | Setting | Geophysical Data: Acquisition | Geophysical Data: Processing & Interpretation | Mapping Results: Bathymetry & Sidescan Sonar | Maping Results: Seismic Stratigraphy | Summary | Acknowledgements | References | List of Figures | Disclaimer

Coastal & Marine Geology Program > South Carolina Coastal Erosion Study > Open File Report 2004-1013