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.

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Last updated on April 25, 2012

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