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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


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Chirp seismic-reflection profile D–D′ with seismic stratigraphic interpretation.

Figure 19. Chirp seismic-reflection profile DD′ 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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