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Conodont biostratigraphy of the upper part of the Clinton Group and the Lockport Group (Silurian) in the Niagara Gorge region, New York and Ontario

Published online by Cambridge University Press:  20 May 2016

Mark A. Kleffner
Mark A. Kleffner*
Affiliation:
Department of Geosciences, The Ohio State University, Lima 45804
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Abstract

Twenty-nine conodont species are represented in formations comprising the upper part of the Clinton Group and the Lockport Group at four localities in Niagara County, New York, and adjacent Ontario, Canada. Four previously unrecognized species of Ozarkodina represented in two samples from the Oak Orchard Formation are described. Ozarkodina sagitta rhenana (Walliser) and O. sagitta sagitta (Walliser) appear to form an evolutionary lineage in which the latter evolved from the former during the late early Wenlockian by slight modification of the Pa element. Elements in the other corresponding positions in their respective apparatuses are virtually identical.

The Williamson Shale, Irondequoit Limestone, Rochester Shale, and DeCew Formation of the Clinton Group belong in the upper part of the Pterospathodus amorphognathoides to the middle part of the Ozarkodina sagitta sagitta Chronozone, and are early to early middle Wenlockian in age. The Gasport, Goat Island, Eramosa, and Oak Orchard Formations of the Lockport Group belong in the middle part of the O. sagitta sagitta to the lower part of the Ancoradella ploeckensis Chronozone, and are early middle to late Wenlockian in age.

Type
Research Article
Information
Journal of Paleontology , Volume 65 , Issue 3 , May 1991 , pp. 500 - 511
Copyright
Copyright © The Paleontological Society 

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