Potentiometric surface of the Lloyd Aquifer, Long Island, New York, in January 1979

Hydrogeology and extent of saltwater intrusion on Manhasset Neck, Nassau County, New York

“…Predevelopment water levels within the Lloyd aquifer in 1900 are inferred to have been above sea level throughout the northern part of Nassau County (Kimmel, 1973). Water levels within the Lloyd aquifer in the area were below sea level in 1947 (Lusczynski, 1952), in 1971(Kimmel, 1973), in 1975(Rich and others, 1975), in 1979(Donaldson and Koszalka, 1983, and in 1984 (Doriski, 1987). Water-level data from quarterly synoptic measurements made during 1992-96 indicate that water in the Lloyd and North Shore aquifers flows northward and develops large cones of depression in response to local public-supply pumping.…”

Hydrogeology and Extent of Saltwater Intrusion in the Northern Part of the Town of Oyster Bay, Nassau County, New York: 1995–98

“…The hydrogeologic framework was remapped by recent USGS work that resulted in the identification of the North Shore aquifer and North Shore confining unit in the Great Neck peninsula by Stumm (2001) and in the Manhasset Neck peninsula by Stumm and others (2002). The most recent water-table reports that include the study area are Kimmel (1971) for 1970, Donaldson and Koszalka (1983) for 1979, Doriski (1987, and Busciolano and others (1998 for 1997. Smith (1958) described the first use of high-power, lowfrequency marine-seismic-reflection equipment to measure the depth to bedrock beneath selected areas of Long Island Sound.…”

“…14). Predevelopment (1900) water levels within the Lloyd aquifer are inferred to have been above sea level throughout the northern part of Nassau County (Kimmel, 1973) and were found to be above sea level in 1947 (Lusczynski, 1952(Kimmel, 1973), 1975(Rich and others, 1975), 1979(Donaldson and Koszalka, 1983), 1980(Kilburn and Krulikas, 1987 and in March-April 1997 (Busciolano and others, 1998). Water-level data from quarterly synoptic measurements made during 1994-98 indicate that water in the Lloyd and North Shore aquifers flows northward from a local ground-water high in the south-central part of the study area ( fig.…”

Hydrogeology of the Lloyd aquifer on Long Island, New York— A brief summary of USGS investigations

“…Sirkin (1974 used pollen data to revise the stratigraphy of the Cretaceous age sediments on Long Island and correlate them with stratigraphic units off of Long Island. Rich and others (1975) and Donaldson and Koszalka (1983) mapped the potentiometric surface of the Lloyd aquifer on Long Island in 1975and 1979, respectively. Garber (1986 provided a compilation of previous hydrogeologic investigations of the Lloyd aquifer.…”