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High-Resolution Geologic Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts

Title Page / Table of Contents / List of Figures / Introduction / Maps / Data Collection/Processing / Interpretation / Acknowledgments / Appendix 1 / Appendix 2 / Appendix 3 / Appendix 4

Fig. 4.9. Ternary diagrams depicting the texture of surficial sediment collected in grab samples. Fig. 4.9. Ternary diagrams depicting the texture of surficial sediment collected in grab samples. Fig. 4.9. Ternary diagrams depicting the texture of surficial sediment collected in grab samples.

Figure 4.9. Maps of seafloor topography (upper left) and backscatter intensity (upper right) in the eastern part of the study area. Both maps are overlain on NOAA-NOS nautical chart #13275. Contour interval is 2 m. See figure 4.4 for location of maps. Dashed lines show boundaries of physiographic zones, which are based on seafloor topography and dominant substrate properties. Bottom photographs A-C (middle) and seismic-reflection profile (bottom) are indicated by yellow circles and line, respectively. The distance across the bottom of the photographs is approximately 50 cm.

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U.S. Department of the Interior | U.S. Geological Survey | Coastal and Marine Geology

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