Figure 3. Side-scan sonar image (left) of S, Sg, and G areas of seabed and their interpretation (right). Sandy seafloor is lighter gray and appears smooth while the gravelly seafloor has wave ripples with straight crestlines about 1 m (3 ft) apart. Sg areas occur as a patchwork of S and G types, but are too small to discriminate at this map scale.
Last updated on April 25, 2012