USGS OFR 2012-1157: Shallow Geology, Sea-floor Texture, and Physiographic Provinces of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts

U.S. Geological Survey Open-File Report 2012-1157

Shallow Geology, Seafloor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts

Title Page / Figures / Conversion Factors and Datum / Abstract / Introduction / Methods / Results / Discussion /Summary / Acknowledgments / References Cited / Appendix 1 / Index

Figure 19. Chirp seismic-reflection profile D–D′ with seismic stratigraphic interpretation. This profile illustrates the stratigraphy beneath western Massachusetts Bay offshore of Scituate, Massachusetts, where a relatively broad depression in the oldest composite fluvial unconformity (U1) is filled by Pleistocene glaciomarine (Qgm) and overlying Holocene fluvial and estuarine (Qfe) sediments. See figure 6 for descriptions of stratigraphic units and major unconformities (indicated by red lines). See figure 8 for profile location. A constant sound velocity of 1,500 meters per second wasused to convert two-way travel time to depth in meters.

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