Figure 12. Sidescan-sonar imagery and chirp seismic-reflection profile on the inner shelf offshore of Surfside Beach. See figure 4 for figure location. Top: Perspective view of sidescan-sonar imagery draped over bathymetry, showing the complex patterns of high backscatter characteristic of the area. Bottom: Chirp seismic-reflection profile showing thin to absent modern sediment and the transgressive surface (blue) exposed at the sea floor. Depth is approximate and assumes a seismic velocity of 1500 m/sec. Figure modified from Baldwin and others (2004, their figure 9).