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U.S. Geological Survey Open-File Report 2012-1157

Shallow Geology, Seafloor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts

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A composite backscatter image at 10-meter resolution

Figure 2. A composite backscatter image at 10-meter resolution was created from a series of published backscatter images (table 1). Areas of high backscatter have strong acoustic reflections and suggest boulders, gravels, and generally coarse seafloor sediments. Low backscatter areas have weak acoustic reflections and are generally finer grained material such as muds and fine sands.

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