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New brachiopod genera from Bird Fiord Formation (Devonian), arctic Canada

Published online by Cambridge University Press:  14 July 2015

Li Rong-Yu  and
Brian Jones
Li Rong-Yu
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada,
Brian Jones
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada,
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Abstract

Brachiopods are common in the lower part of the late Early to Middle Devonian Bird Fiord Formation that is a carbonate-clastic transition succession found in Arctic Canada. These brachiopods, which lived in a shallow, near-shore, marine environment, includes three new genera: Borealistrophia, Arcticastrophia, and Grinnellathyis. The strophomenid Borealistrophia, which is characterized by two pairs of straight side septa, prominent and thick socket ridges, a thick but short median septum, and a cordate ventral muscle field, is found in the Baad Fiord, Blubber Point, and Norwegian members on Bathurst, Devon, North Kent, and Ellesmere islands. The strophomenid Arcticastrophia, which is distinctive because of its stout transmuscle septa, its narrow and low medium septum, and elevated ventral muscle field, is found in the Baad Fiord Member on Bathurst and Devon islands. The athyridid Grinnellathyris, which is characterized by an imperforated cardinal plate and inverted U-shaped jugum, is found in the Baad Fiord Member on Bathurst, North Kent, and Devon islands. The similarities between Grinnellathyris and Johnsonathyris Savage, Eberlein, and Churkin, 1978, in terms of their shell size and internal structures, may indicate that the latter evolved from the former.

Type
Research Article
Information
Journal of Paleontology , Volume 76 , Issue 4 , July 2002 , pp. 648 - 658
Copyright
Copyright © The Paleontological Society

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