LES SIRKIN, ROBERT STUCKENRATH; The Portwashingtonian warm interval in the northern Atlantic coastal plain. GSA Bulletin ; 91 (6): 332–336. doi: https://doi.org/10.1130/0016-7606(1980)91<332:TPWIIT>2.0.CO;2
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Stratified and deformed masses of marine sediment that range in age from 43,800 to 21,750 yr were deposited in the Woodfordian moraine on western Long Island, New York. Reconstruction of the geologic history of these sediments provides further evidence of a mid-Wisconsinan warm interval, the Portwashingtonian warm interval (new name), that is represented by warm climate, temperate forests, and relative sea level comparable to modern sea level.