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New trilobite taxa from Upper Cambrian microbial reefs in the central Appalachians

Published online by Cambridge University Press:  20 May 2016

James D. Loch  and
John F. Taylor
James D. Loch
Affiliation:
Department of Biology and Earth Science, Central Missouri State University, Warrensburg 64093,
John F. Taylor
Affiliation:
Geoscience Department, Indiana University of Pennsylvania, Indiana 15705,
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Abstract

Previously undescribed trilobites associated with microbial patch reefs have been recovered from the Upper Cambrian (upper Steptoean Stage) Ore Hill Limestone Member of the Gatesburg Formation in south-central Pennsylvania. Reefs in the Imler Quarry and Drab-Beaverton measured sections yielded low-diversity assemblages of trilobites that we assign to the uppermost Cliffia lataegenae Subzone of the Elvinia Zone. The faunas are dominated by the catillicephalid Buttsia drabensis Wilson, 1951, and include several new taxa that are not known from coeval off-reef facies. Fine-scale correlation between the two sections reveals that the reefs in the Drab-Beavertown section are slightly younger than those at Imler Quarry and represent the youngest Steptoean fauna described from the Appalachian region.

New taxa include Imlerella n. gen. (type species Imlerella praecipita n. sp.), Stittaspis n. gen. (type species Stittaspis loria n. sp.), and Dellea rogersi n. sp. Stigmacephalus? distorta Wilson, 1951, is reassigned to Stittaspis and is restricted to the type. Additional material of Buttsia drabensis illustrates features not discernible in previous treatments of this variable species.

Type
Research Article
Information
Journal of Paleontology , Volume 78 , Issue 3 , May 2004 , pp. 591 - 602
Copyright
Copyright © The Paleontological Society 

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