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Open-File Report 2014–1018

Sea-Floor Geology in Northwestern Block Island Sound, Rhode Island

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

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

Figure 2. Map of end moraines (black-shaded polygons) and submerged ridges (dashed lines) in southern New York and New England (modified from Gustavson and Boothroyd, 1987) with the study area (red-outline polygon). The Ronkonkoma-Block Island-Nantucket terminal moraine represents the maximum advance of the Laurentide Ice Sheet about 20,000 to 28,000 years ago. The Harbor Hill-Roanoke Point-Charlestown-Buzzards Bay end moraine represents a retreated ice-sheet position from about 18,000 to 23,000 years ago (Uchupi and others, 2001; Balco, 2011).

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