This early geological map delineates the various formations in Berkshire County. The legend uses hand coloring and patterns to locate eleven formations plus Beds of Iron Ore located by dots. Bounded on the west by the Hudson River the map details the geology of Columbia and Raenssalaer counties in New York.
References: Marcou 197.
Folding as issued. Strong hand coloring and good impression. Some offsetting and a small hole at center.