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Figure modified from Schwab et al. (2013).
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Fig. 3.
Map showing the coastal plain unconformity. Regional bathymetric contours are in meters. The inset map shows the locations of seismic-reflection profiles where subbottom penetration and BMS-345541 allowed identification of the coastal plain unconformity and include chirp data collected in 2011 and reprocessed boomer, airgun, and sparker data collected in 1996–1997 (Foster et al., 1999). The unconformity was gridded using a 100-m cell size. The relatively sparse seismic-reflection data coverage results in a surface that clearly contains trackline artifacts and a relatively higher uncertainty in comparison with other maps presented.
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4.2. Pleistocene glaciofluvial sediment
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Fig. 4.
(A) Map showing modern sediment thickness in meters overlain on bathymetry (Fig. 1B). The seaward extent of the modern beach wedge (lower shoreface) is shown as a dashed red line. Regional bathymetric contours are in meters. The inset map shows the locations of chirp seismic-reflection profiles collected in 2011 used to map the Holocene transgressive unconformity and thus the modern sediment thickness. (B) Profile showing water depth of toe of the lower shoreface shown in (A).