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A Bohemian-type Silurian (Wenlockian) pelecypod faunule from Arctic Canada

Published online by Cambridge University Press:  19 May 2016

John Pojeta Jr.  and
B. S. Norford
John Pojeta Jr.
Affiliation:
U.S. Geological Survey, Washington, D.C. 20560
B. S. Norford
Affiliation:
Geological Survey of Canada, Calgary, Alberta T2L 2A7
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Abstract

The pelecypod genera Slava and Rhombopteria are reported for the first time from Canada, where they occur in a limestone concretion within the Cape Phillips Formation, Cornwallis Island, Arctic Archipelago. These genera are characteristic of Silurian rocks in Bohemia, Czechoslovakia. Graptolites from the same concretion indicate the Monograptus ludensis Zone (uppermost Wenlockian); this age is substantiated by associated conodonts, trilobites, vertebrates, and pelecypods but with less precision. It is difficult to explain the occurrence of Slava and Rhombopteria in the middle of Laurentia on the basis of some map reconstructions of the Wenlockian world.

The Canadian material of Slava novaterra n. sp. and Rhombopteria cf. R. mira (Barrande) is described. Leptodesma (Leptodesma) sp. A and an indeterminate grammysiid pelecypod from the same concretion are illustrated. Information is provided to show that Newsomella Foerste, from Wenlockian–Ludlovian rocks of Illinois, Wisconsin, and Tennessee, is not a subgenus of Rhombopteria Jackson.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 3 , May 1987 , pp. 508 - 520
Copyright
Copyright © The Paleontological Society 

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