Figure 4. A composite backscatter image at 1-meter resolution, created from a series of published backscatter images (table 1). Areas of high backscatter (light gray tones) have strong acoustic reflections and suggest boulders, gravels, and generally coarse sea-floor sediments. Low-backscatter (dark gray to black tones) areas have weak acoustic reflections and generally indicate finer grained material such as fine sands and muds. Red star shows location of figure 20.