Because of many easily recognized and restricted species, the fauna of the thin Centerfield formation of New York has considerable stratigraphic importance. The fauna is readily traced across New York from Chenango Valley to Erie County and appears in Ontario and Michigan. In Ohio, Indiana, and Kentucky, the fauna occurs with its important elements. In less typical aspect Centerfield fossils appear in northwestern Arkansas and possibly in West Tennessee. The Centerfield equivalent forms the top of the Hamilton in the Midwest, thus indicating a Marcellus- Skaneateles age for the underlying Hamilton beds.

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