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Oryctocephalids (Corynexochida: Trilobita) of the Lower-Middle Cambrian boundary interval from California and Nevada

Published online by Cambridge University Press:  14 July 2015

Frederick A. Sundberg  and
Linda B. Mccollum
Frederick A. Sundberg
Affiliation:
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

Seven species of oryctocephalids occur in the Lower to Middle Cambrian boundary strata of the southern Great Basin. These include Oryctocephalites palmeri n. sp. and an Oryctocephalinae species from the uppermost Lower Cambrian (upper Olenellus Biozone); Oryctocephalus indicus (Reed, 1910), Microryctocara nevadensis n. gen. and n. sp., and Oryctocephalites rasettii n. sp. near the base of the Middle Cambrian (lower Plagiura Biozone); and Oryctocephalus primus Walcott, 1886, and Oryctocephalus nyensis Palmer, 1979, from slightly higher strata (upper Plagiura Biozone). Oryctocephalus and Oryctocephalites are emended based on a cladistic analysis of Oryctocephalinae Beecher, 1897.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 6 , November 1997 , pp. 1065 - 1090
Copyright
Copyright © The Paleontological Society 

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