1. Stratigraphy of the subsurface lower and middle Devonian of New York, Pennsylvania, Ohio, and Ontario Yale Public content 1988. 2008-10-20T18:43:29Z. 2011-03-28T23:34:04Z. Richard, Lawrence V. New York State Education Dept. English. Public. New York (State), Pennsylvania, Ohio, and Ontario, Southern. Devonian.