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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 4.11. Seismic-reflection profile showing a broad channel cut into fluvial and glacial-marine sediment in the southern part of the study area. The well-stratified sediment that fills the channel is interpreted as estuarine sediment. The transgressive unconformity (red line) is overlain by 5 to 6 m of sandy marine sediment, which is among the thickest Holocene deposits in the region. See Figure 4.3 for location. A constant seismic velocity of 1500 m/s through water, sediment, and rock was used to convert from two-way travel time to depth.


Figure 4.11.  Seismic-reflection profile showing a broad channel cut into fluvial and glacial-marine sediment in the southern part of the study area.  The well-stratified sediment that fills the channel is interpreted as estuarine sediment.  The transgressive unconformity (red line) is overlain by 5 to 6 m of sandy marine sediment, which is among the thickest Holocene deposits in the region.  See Figure 4.3 for location.  A constant seismic velocity of 1500 m/s through water, sediment, and rock was used to convert from two-way travel time to depth.  

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