1. Geologic map of the Catskill and Kaaterskill quadrangles Yale Public content 1942. 2018-08-07T12:59:21Z. 2020-08-14T18:08:35Z. The University of the State of New York. English. cartographic image. Public. New York (State), Catskill Mountains, and Catskill Mountains (N.Y.). Devonian and Silurian.