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Marjuman (Cambrian) agnostoid trilobites of the Cow Head Group, western Newfoundland

Published online by Cambridge University Press:  20 May 2016

Stephen R. Westrop ,
Rolf Ludvigsen  and
Cecil H. Kindle
Stephen R. Westrop
Affiliation:
Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1
Rolf Ludvigsen
Affiliation:
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 2Y2 (Mailing Address: 4062 Wren Road, Denman Island, British Columbia VOR 1TO)
Cecil H. Kindle
Affiliation:
332 N. Midland Ave., Upper Nyack, New York 10960
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Abstract

Shelf-derived limestone boulders in debris flows of the Cow Head Group, western Newfoundland, have yielded rich mid- to Upper Cambrian trilobite faunas. The agnostoid component of Marjuman boulders consists of 23 species assigned to 11 genera; Kormagnostus boltoni and Kormagnostus? copelandi are new. Cladistic parsimony analysis of the Ptychagnostidae Kobayashi reduces this family to 3 genera: Ptychagnostus Jaekel, Pseudophalacroma Pokrovskaya and Lejopyge Hawle and Corda; Ptychagnostus includes three non-obligate subgenera: P. (Ptychagnostus) (= Tomagnostus Howell); P. (Goniagnostus) Howell and P. (Aotagnostus) öpik (= Myrmecomimus öpik). Correlation with zonations established in northern Canada and Utah indicates that the Cow Head Group includes a nearly complete sequence of agnostoid faunas from the mid-Cambrian Ptychagnostus gibbus Zone to the Upper Marjuman Cedaria brevifrons Zone.

Type
Research Article
Information
Journal of Paleontology , Volume 70 , Issue 5 , September 1996 , pp. 804 - 829
Copyright
Copyright © The Paleontological Society 

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