USGS Open-File Report 99-559, Stratigraphic Framework Maps of the Nearshore Area of Southern Long Island from Fire Island to Montauk Point, New York, Figures/Maps

		Table 1. -- Stratigraphy of Long Island and the southern Long Island inner shelf
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		Figure 1. Index map showing the nearshore study area off southern Long Island, New York.
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		Figure 2. Surficial geologic map of Long Island, New York (modified from New York State Geological Survey, 1986; http://www.nysm.nysed.gov/gis.html ).
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		Figure 3. Map showing the topography and bathymetry of Long Island and the shelf off of southern Long Island, New York (modified from Pratson and others, 1999; Sharman and others, 1999; http://www.ngdc.noaa.gov/mgg/coastal/coastal.html).
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		Figure 4. Map showing the elevation of the Coastal Plain unconformity, which is at the erosional surface of Upper Cretaceous strata. Outline of shoreline is shown for reference. Locations A and B indicate the locations of boomer seismic profiles (Fig. 5a,b). Inset above shows locations of onshore hydrographic wells (red dots) and the data points digitized from seismic profiles (black dots) used to model the surface elevation of the Coastal Plain unconformity.
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		Figure 5a. Processed boomer subbottom profile with interpretation of reflection horizons. This north-south oriented profile, located off Fire Island, shows the Coastal Plain unconformity where the truncations of coastal-plain strata are clearly seen. Water depth in meters is assuming a seismic velocity of 1500 m/s. See figures 4 and 6 for profile location.
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		Figure 5b. Processed boomer subbottom profile with interpretation of reflection horizons. This profile is located in the eastern part of the study area. Water depth in meters is assuming a seismic velocity of 1500 m/s. See figures 4 and 6 for profile location.
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		Figure 6. Thickness of Quaternary sediments beneath Long Island and the southern Long Island inner shelf derived from onshore well data and offshore seismic profiles (see figure 4 for data distribution). Cretaceous Coastal Plain strata outcrop near 73 degrees longitude where zero Quaternary sediment thickness is indicated. The white line denotes southern extent of an upper Pleistocene unit, interpreted to be a proximal outwash unit. A and B indicate the locations of boomer seismic profiles (Fig. 5a,b).
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		Figure 7. Map showing the thickness of channel fill with approximate borders of each system marked. Locations of the two CHIRP profiles in figure 8 are marked.
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		Figure 8a. Processed CHIRP subbottom profiles with interpretation of reflection horizons. This profile shows a series of cut-and-fill structures. The channel is cut into the Pleistocene unit. Water depth in meters is assuming a seismic velocity of 1500 m/s. See figures 7 and 9 for profile location.
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		Figure 8b. Processed CHIRP subbottom profiles with interpretation of reflection horizons. This profile shows a modern sand ridge that is part of a system of ridges located off Fire Island. Water depth in meters is assuming a seismic velocity of 1500 m/s. See figures 7 and 9 for profile location.
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		Figure 9. Map showing the thickness of the modern sand unit. Locations of CHIRP subbottom profiles in figure 8 are marked.
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