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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 4.7. Graph showing the relationship between mean backscatter values (DN = digital number) and mean grain size for 14 bottom samples collected in the nearshore area. Sediment in areas of relatively high backscatter (values greater than 45) consists of coarse sand. Sediment in areas of relatively low backscatter (values less than 45) primarily consists of fine sand. No samples of medium sand (gray box) were collected.


Figure 4.7.  Graph showing the relationship between mean backscatter values (DN = digital number) and mean grain size for 14 bottom samples collected in the nearshore area.  Sediment in areas of relatively high backscatter (values greater than 45) consists of coarse sand.  Sediment in areas of relatively low backscatter (values less than 45) primarily consists of fine sand.  No samples of medium sand (gray box) were collected. 

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