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Trilobites of the Lower Ordovician (Ibexian) Fort Cassin Formation, Champlain Valley region, New York State and Vermont

Published online by Cambridge University Press:  20 May 2016

Kevin D. Brett  and
Stephen R. Westrop
Kevin D. Brett
Affiliation:
Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1
Stephen R. Westrop
Affiliation:
Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1
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Abstract

The Lower Ordovician (Ibexian) Fort Cassin Formation of New York State and Vermont consists mainly of carbonates that were deposited in a subtidal storm-influenced setting. The low diversity trilobite fauna is dominated overwhelmingly by the isoteline, Isoteloides. Eleven species representing at least nine genera are described; Acidiphorus whittingtoni is new. The bathyurine genus Goniotelina Whittington and Ross is regarded as paraphyletic and is synonymized with Acidiphorus Raymond. The presence of Isoteloides canalis (Whitfield; = I. latimarginatus Fortey), I. peri Fortey and Bathyurellus platypus Fortey indicates a correlation of the Fort Cassin with the Strigigenalis caudata Zone of the Catoche Formation of western Newfoundland.

Type
Research Article
Information
Journal of Paleontology , Volume 70 , Issue 3 , May 1996 , pp. 408 - 427
Copyright
Copyright © The Paleontological Society 

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