Eccentricosta jerseyensis Silurian Zonal Fossil
ABOVE: Eccentricosta jerseyensis, an important zonal brachiopod, from the Late Silurian Cobleskill Lime- stone of Frontenac Island, Cayuga Lake, New York.
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Eurypterids.net
Samuel J. Ciurca, Jr., Rochester, New York
ABOVE: Eccentricosta jerseyensis, preserved in fine-grained dolostone.  Williamsville (B) Formation, Bertie Group, Nied Road Quarry near LeRoy, New York.  Collection of the author.
EURYPTERIDS
In Eastern New York, Eurypterus is common above and below the occur- rences of E. jerseyensis in the Coble- skill Formation.  In Western New York State, limestones of the Cobleskill give way to the dolomitic sequence (Williamsville and overlying Akron Dolostones of the Bertie Group).  The Eurypterus lacustris Biozone is thus associated intimately with that of the zonal Eccentricosta jerseyensis.
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DISTRIBUTION OF ECCENTRICOSTA JERSEYENSIS