A coral bed in the Skaneateles Formation of central New York, here designated the Case Hill Coral Bed, attains a thickness of 1 1/2 to 2 feet. Although it is apparently restricted to the Tully Valley region its exact areal extent is not known. The fauna of the Case Hill Coral Bed, a mixture of corals and other invertebrates, is especially significant in that it includes Hamilton favositids previously unknown below the Ludlowville Formation in New York. The range of Favosites argus is extended downward by at least 355 feet in the Tully Valley.

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