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Open-File Report 2005-1293

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. 4.8. Maps of seafloor topography  and backscatter intensity  in the eastern part of the study area. Fig. 4.8. Maps of seafloor topography  and backscatter intensity  in the eastern part of the study area. Fig. 4.8. Maps of seafloor topography  and backscatter intensity  in the eastern part of the study area.

Figure 4.8. Map of seafloor topography colored by backscatter intensity in the northeastern part of the study area. Depth and backscatter data in this map were collected simultaneously by the pole-mounted interferometric sonar, ensuring precise navigation. The depth profile (A - A') crosses a sorted bedform in the upper part of the map; color coding on the profile shows high backscatter material on the floor of a shallow depression. Parallel stripes that trend SW-NE are artefacts of data collection. Bottom photographs B-D are indicated by red circles on map. Map scale is 1:10,000. See figure 3.3 for location.


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