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Rickard, L., 1981. The Devonian System of New York State, in: Oliver, W., Klapper, G. (Eds.), Devonian biostratigraphy of New York; Part 1, TextIUGS, Subcommission Devonian Stratigraphy, Washington, D. C.. pp. 5-21.

Kirchgasser, W., Oliver, W., Rickard, L., 1985. Devonian Series Boundaries in the Eastern United States. Courier Forschungsinstitut Senckenberg 75, 233-260.