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Early Middle Cambrian Albertella Biozone trilobites of the Pioche Shale, southeastern Nevada

Published online by Cambridge University Press:  14 July 2015

Julie D. Eddy  and
Linda B. McCollum
Julie D. Eddy
Affiliation:
Department of Geology, Eastern Washington University, Cheney 99004
Linda B. McCollum
Affiliation:
Department of Geology, Eastern Washington University, Cheney 99004
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Abstract

Thirty-four species of trilobites belonging to 21 genera are recognized in the Albertella Biozone within the Grassy Spring Member (new name) of the Pioche Shale of southeastern Nevada. Genera include Pagetia, Poliella, Kootenia, Olenoides, Albertella, Albertellina, Albertelloides, Delamarella, Mexicaspis, Paralbertella, Ptarmiganoides, Ursinella, Zacanthoides?, Amecephalites, Mexicella, Nyella, Onchocephalites?, Pachyaspis, Panacus, Plagiura, and Volocephalina. Two new corynexochid genera and species, Delamarella brevispinaspis and Ursinella major, are described. The existing corynexochid genus Albertella is revised to include two new species, A. fritzi and A. highlandensis. A new species, Albertelloides kitai, is described. Two new ptychopariid genera, Amecephalites and Panacus, plus four new ptychopariid species, Amecephalites sundbergi, Mexicella granulata, Panacus palmeri, and Volocephalina variosa, are described and Nyella immoderata Palmer is revised. In addition, the Albertella Biozone is divided into three new subbiozones, the lower Albertellina aspinosa Subbiozone, the middle unnamed subbiozone, and the Albertella highlandensis Subbiozone.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 5 , September 1998 , pp. 864 - 887
Copyright
Copyright © The Paleontological Society 

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