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U.S. Geological Survey Open-File Report 2007-1373

High-Resolution Geologic Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts

Skip past contents informationTitle Page / Table of Contents / List of Figures / Introduction / Maps / Data Collection/Processing / Interpretation / Summary / Acknowledgments / References Cited / Appendix 1 / Appendix 2 / Appendix 3 / Appendix 4 / Appendix 5

Figure 4.5. Maps showing bathymetry (upper left) and acoustic-backscatter intensity (upper right) on the Nearshore Ramp (NR) in the central part of the survey area. Parallel stripes that trend NW-SE in the backscatter data are artifacts of data collection. Color coding on the depth profile (bottom) shows high backscatter (coarse sand and gravel) in the shallow depression and low backscatter (fine sand) on the adjacent, bathymetrically higher areas. Bottom photographs (A and B) collected on opposite sides of the backscatter transition illustrate the different grain sizes that produce the changes in intensity. The distance across the bottom of the photographs is approximately 50 cm. See Figure 4.1 for location.


Figure 4.5. Maps showing bathymetry (upper left) and acoustic-backscatter intensity (upper right) on the Nearshore Ramp (NR) in the central part of the survey area.  Parallel stripes that trend NW-SE in the backscatter data are artifacts of data collection.  Color coding on the depth profile (bottom) shows high backscatter (coarse sand and gravel) in the shallow depression and low backscatter (fine sand) on the adjacent, bathymetrically higher areas.  Bottom photographs (A and B) collected on opposite sides of the backscatter transition illustrate the different grain sizes that produce the changes in intensity.  The distance across the bottom of the photographs is approximately 50 cm.  See Figure 4.1 for location.

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