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A new Sunwaptan (Late Cambrian) trilobite fauna from the Upper Mississippi Valley

Published online by Cambridge University Press:  20 May 2016

Stephen R. Westrop ,
Allison R. Palmer  and
Anthony Runkel
Stephen R. Westrop
Affiliation:
Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman 73072,
Allison R. Palmer
Affiliation:
Institute for Cambrian Studies, 445 N. Cedarbrook Rd., Boulder, Colorado 80304,
Anthony Runkel
Affiliation:
University of Minnesota, Minnesota Geological Survey, 2642 University Avenue W, St. Paul 55114-1057,
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Abstract

A single bed at the base of the Jordan Sandstone in a road cut at Arcadia, Wisconsin, yielded an undescribed Late Sunwaptan (Saukia Zone) trilobite fauna that includes at least four species from the families Dikelocephalidae Miller, 1889 and Eurekiidae Hupé, 1953. Arcadiaspis bispinata n. gen. and sp. is a distinctive eurekiid that is characterized by paired occipital and thoracic axial spines, long genal spines, and a nonspinose pygidial margin. Other genera present are the dikelocephalids, Dikelocephalus Owen, 1852 and Calvinella Walcott, 1914, and the eurekiid, Eurekia Walcott, 1916. Type material of Calvinella spiniger (Hall, 1863) is illustrated photographically for the first time. A new eurekiid species, Corbinia burkhalteri from the Fort Sill Formation, Oklahoma, is also described.

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 1 , January 2005 , pp. 72 - 88
Copyright
Copyright © The Paleontological Society 

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