Figure 1. Locations of the surveys in Rhode Island and Block Island Sounds with multibeam echosounder data that have been combined in this report (polygons with red survey labels). Also shown are (1) the eastern extent of the contiguous multibeam data collected in Long Island Sound by the National Oceanic and Atmospheric Administration (NOAA) and geologically interpreted through a U.S. Geological Survey and Connecticut Department of Energy and Environmental Protection cooperative (dashed brown line; Poppe and others, 2011a); (2)  the western extent of the bathymetry data collected by the Massachusetts Mapping Cooperative (dashed green line; Ackerman and others, 2012; Andrews and others, 2013); and (3) the locations of other surveys by NOAA that have been geologically interpreted as part of this series, but did not have continuous-coverage multibeam bathymetry (polygons with black labels; H11320—McMullen and others (2007); H11321—McMullen and others (2008); and H11322—McMullen and others (2009a). The surveys that compose the present study area and their respective reports that contain geological interpretations include H11922—Poppe and others (2011b); H11996—McMullen and others (2011); H11995—McMullen and others (2012); the combined Block Island Sound datasets H12009, H12010, H12011, H12015, H12033, H12137 and H12139 —Poppe and others (2012); H12023 —McMullen and others (2013) and H12296 —McMullen and others (2014); and H12298 and H12299 for which reports are in preparation.