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U.S. Geological Survey Open-File Report 2012–1004

Sea-Floor Geology in Central Rhode Island Sound South of Sakonnet Point, Rhode Island


Skip past contents information Title | List of Figures | Conversion Factors | Abstract | Introduction | Setting | Methods | Bathymetry | Sediments | Bottom Photography | GIS Data Catalog | Summary | Acknowledgments | References | Contacts


Figure 2. A map showing end moraines in southern New York and New England.

Figure 2. Map of end moraines (black polygons) and submerged ridges (dashed lines) in southern New York and New England (modified from Gustavson and Boothroyd, 1987) with study-area location (red polygon). The Ronkonkoma-Block Island-Nantucket end moraine represents the maximum advance of the Laurentide Ice Sheet about 20,000 to 24,000 years ago, while the Harbor Hill-Roanoke Point-Charlestown-Buzzards Bay end moraine, of which a submerged segment crosses through the study area, represents a retreated ice-sheet position from about 18,000 years ago (Uchupi and others, 2001).

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