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The lower Williamson Shale (Silurian) of New York: a biostratigraphical enigma

Published online by Cambridge University Press:  09 February 2007

D. K. LOYDELL ,
M. A. KLEFFNER ,
G. L. MULLINS ,
A. BUTCHER ,
D. K. MATTESON  and
J. R. EBERT
D. K. LOYDELL
Affiliation:
School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
M. A. KLEFFNER
Affiliation:
Department of Geological Sciences, The Ohio State University at Lima, 4240 Campus Drive, Lima, OH 45804-3576, USA
G. L. MULLINS
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
A. BUTCHER
Affiliation:
School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
D. K. MATTESON
Affiliation:
Earth Sciences Department, SUNY College at Oneonta, Oneonta, NY 13820-4015, USA
J. R. EBERT
Affiliation:
Earth Sciences Department, SUNY College at Oneonta, Oneonta, NY 13820-4015, USA
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Abstract

The lower Williamson Shale at Tryon Park, Rochester, New York State is unique in the co-occurrence of Stimulograptus clintonensis (Hall), previously recorded only from the middle Telychian, and Pterospathodus amorphognathoides amorphognathoides Walliser, previously recorded only from the upper Telychian (Cyrtograptus lapworthi Biozone and higher). These two co-occurring fossils are clearly providing contradictory ages for the lower Williamson Shale. The incorporation of chitinozoan data from both the Williamson and Willowvale shales does not support unequivocally either the graptolite- or conodont-derived biostratigraphy and thus the age of the lower Williamson Shale remains problematical.

Keywords

graptoliteschitinozoansconodontsLlandoverySilurian
Type
Original Article
Information
Geological Magazine , Volume 144 , Issue 2 , March 2007 , pp. 225 - 234
Copyright
© 2007 Cambridge University Press

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