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Ptychopariid trilobites of the Lower-Middle Cambrian boundary interval, Pioche Shale, southeastern Nevada

Published online by Cambridge University Press:  20 May 2016

Frederick A. Sundberg  and
Linda B. Mccollum
Frederick A. Sundberg
Affiliation:
Research Associate, Invertebrate Paleontology Section, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, California 90007
Linda B. Mccollum
Affiliation:
Department of Geology, Eastern Washington University, Cheney, 99004-2499,
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Abstract

Twelve ptychopariid species assigned to five genera occur in the Lower-Middle Cambrian boundary interval, Pioche Shale, eastern Nevada. New taxa include one genus, Eokochaspis, and seven species, Eokochaspis nodosa, E. delamarensis, E. metalaspis, E. longspina, Kochina? walcotti, Mexicella antelopea, and M. robusta. Two new biozones, the Eokochaspis nodosa and overlying Amecephalus arrojosensis Biozones, are proposed between the Lower Cambrian Olenellus Biozone and the Middle Cambrian Plagiura-Poliella Biozone. In addition, the three remaining informal shale members of the Pioche Shale are formally named.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 4 , July 2000 , pp. 604 - 630
Copyright
Copyright © The Paleontological Society 2000

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