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Upper Wenlock Ceratoikiscidae (Radiolaria) from the Cape Phillips Formation, Arctic Canada

Published online by Cambridge University Press:  14 July 2015

Paula J. Noble  and
Alfred C. Lenz
Paula J. Noble
Affiliation:
Department of Geological Sciences and Engineering, University of Nevada, Reno 89557-0138, USA,
Alfred C. Lenz
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7, Canada,
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Abstract

Taxa belonging to the Ceratoikiscidae are described in detail from two measured sections of Member C of the Cape Phillips Formation exposed along Rookery Creek, Cornwallis Island, Arctic Canada. The sections encompass uppermost Sheinwoodian (top lower Wenlock) to the base of the Gorstian (base Ludlow) and are dated by graptolites assigned to the Cyrtograptus perneri–Monograptus opimus Zone (upper Sheinwoodian), the Cyrtograptus lundgreni Zone (lower Homerian), and the Colonograptus praedeubeli–Colonograptus deubeli Zone (upper Homerian). Radiolarians are found in great abundance throughout the lower Homerian, allowing for the establishment of the first appearance of the genus Helenifore Ormiston and Nazarov. Helenifore is emended to accommodate the Silurian species H. quadrispina n. sp. and H. speciosus (Furutani 1990). One new genus, Kappaforma, including the new species, K. insecta, is described, as is the new species H. quadrispina. Ceratoikiscum octapleura Renz and C. armiger Furutani are synonymized with C. lenoides Renz, and H. planus Umeda is synonymized with H. speciosus.

Type
Research Article
Information
Journal of Paleontology , Volume 81 , Issue 5 , September 2007 , pp. 1044 - 1052
Copyright
Copyright © The Paleontological Society 

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