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Additional information on lowest Ordovician trilobites from the uppermost Deadwood Formation, Black Hills and Bear Lodge Mountains, South Dakota and Wyoming

Published online by Cambridge University Press:  20 May 2016

James H. Stitt
James H. Stitt*
Affiliation:
Department of Geological Sciences, University of Missouri-Columbia, Columbia 65211
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Extract

Trilobites from the Missisquoia Zone and the Symphysurina brevispicata Subzone of the Symphysurina Zone (Ibexian Series, lowest Ordovician) were collected from measured sections in the uppermost Deadwood Formation in the Black Hills of South Dakota and Bear Lodge Mountains in northeasternmost Wyoming. These collections were made by Christina Lochman-Balk and her students, and turned over to the author to complete the project. They are compared with previous reported occurrences of this fauna from this area. No trilobites from the underlying Sunwaptan Stage (Upper Cambrian) occur with the lowest Ordovician trilobites, suggesting that the sharp faunal extinction at the base of the Ordovician (North American sense = Eurekia apopsis Zone, Ibexian Series) occurred in the Deadwood Formation as it did over all of the North American continent.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 74 , Issue 2 , March 2000 , pp. 360 - 362
Copyright
Copyright © The Paleontological Society 2000

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