1. Results of core drilling of the Ramapo fault at Sky Meadow Road, Rockland County, New York, and assessment of evidence for reactivation to produce current seismicity [cartographic material] Yale Public content 1982. 2016-01-07T20:36:23Z. 2016-07-13T21:10:33Z. Ratcliffe, Nicholas M. (Nicholas Morley), 1938-. U.S. Geological Survey. English. cartographic image. Public. New York (State), Rockland County, Rockland County (N.Y.), and Rockland County.