Figure 15. Sidescan-sonar image showing wisps of presumed coarser sand (higher backscatter lighter tones) surrounded by lower backscatter (darker tones) finer grained sediment.  Detail of sidescan-sonar image (lower right) shows the high-backscatter wisps, and the bottom photograph  (lower left) is taken from the sample location shown on the sidescan-sonar detail.  Pie diagrams show the amount of sand (yellow) versus mud (purple) in the surface grab samples.  Click on the figure to view a larger image. Figure location shown in Fig. 4.