Figure 3. Map showing the thickness of modern sediment within the study area. Sediment thickness was mapped through interpretation of chirp seismic reflection data. Inlet shoal complexes and shore-detached shoals are outlined. Thicknesses are reported in meters (assuming a velocity of 1500m/sec). Areas where the sea floor bathymetry is visible indicate areas of surficial sediment < 0.5 m thick. Figure modified from Baldwin and others (2004, their figure 17). The background shaded relief imagery is a digital elevation model of the northeastern South Carolina coastal plain (NOAA-NGDC, 2001).