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Map: Geologic Map of New York State Showing Surface Rock Systems.
From the Geological History of New York State by William J. Miller, Ph. D., reproduced by courtesy of Dr. Miller. Areas are labeled for the Tertiary-Quaternary, Cretaceous, Triassic, Carbonic, Devonic, Siluric, Ordovicic, Cambric and Precambric periods.
http://www.schenectadyhistory.org/resources/mvgw/maps/nys_surface_rock_systems_map.html updated July 8, 2008
Copyright 2008 Schenectady Digital History Archive — a service of the Schenectady County Public Library