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Lower Cambrian (Branchian) eodiscoid trilobites from the lower Brigus formation, Avalon Peninsula, Newfoundland, Canada

Memoirs of the Association of Australasian Palaeontologists
Issue 42 (2012)

Abstract: Eodiscoids form a significant component of the Lower Cambrian (Branchian) trilobite fauna of the St. Mary's and lower Jigging Cove members of the Brigus Formation exposed along Conception and Trinity bays, northern Avalon Peninsula, Newfoundland. Two species of Serrodiscus Richter and Richter, four species of Hebediscus Whitehouse, and rare sclerites of Meniscuchus? pik and Calodiscus Howell are documented; type material of M.? helena (Walcott) is reillustrated. Hebediscus attleborensis (Shaler and Foerste) is restricted to the types, and H. williamsi is new. A parsimony analysis indicates that Serrodiscus is paraphyletic but supports monophyly of Acidiscus Rasetti, Bolboparia Rasetti and Stigmadiscus Rasetti. Above a sparsely fossiliferous interval in the lowest part of the Brigus, three eodiscoid faunas can be identified in the upper St. Mary's and lower Jigging Cove members, in ascending order, the Hebediscus planus, H. williamsi and Calodiscus cf. C. lobatus faunas. The lower two faunas correspond to part of the traditional "Callavia Zone" of previous workers.

To cite this article: Westrop, Stephen R and Landing, Ed. Lower Cambrian (Branchian) eodiscoid trilobites from the lower Brigus formation, Avalon Peninsula, Newfoundland, Canada [online]. Memoirs of the Association of Australasian Palaeontologists, No. 42, 2012: [209]-262. Availability: <http://search.informit.com.au/documentSummary;dn=984617395155287;res=IELHSS> ISSN: 0810-8889. [cited 07 Feb 16].

Personal Author: Westrop, Stephen R; Landing, Ed; Source: Memoirs of the Association of Australasian Palaeontologists, No. 42, 2012: [209]-262 Document Type: Journal Article ISSN: 0810-8889 Subject: Trilobites--Type specimens; Geology, Stratigraphic; Paleontology; Biogeography; Peer Reviewed: Yes Affiliation: (1) Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73072, USA, email: swestrop@ou.edu
(2) New York State Museum, 222 Madison Avenue, Albany, New York 12230, USA

Database: Humanities & Social Sciences Collection