Figure 2. Map showing the location of end moraines, submerged moraine lines in southern New York and New England (modified from Gustavson and Boothroyd, 1987), the extent of marine deltaic deposits from the Connecticut River (Lewis and DiGiacomo-Cohen, 2000), and the location of the study area (red polygon). The Ronkonkoma-Block Island-Nantucket end moraine represents the maximum advance of the Laurentide Ice Sheet about 20,000-24,000 years ago; the Harbor Hill-Roanoke Point-Charleston-Buzzards Bay end moraine represents a retreated ice-sheet position from about 18,000-21,000 years ago (Uchupi and others, 1996; Balco and others, 2002, Balco and others, 2009).