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Seirocrinus subangularis (Miller, 1821), a Pliensbachian (Lower Jurassic) crinoid from the Fernie Formation, Alberta, Canada

Published online by Cambridge University Press:  20 May 2016

Russell L. Hall
Russell L. Hall*
Affiliation:
Geology and Geophysics, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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Abstract

An almost complete specimen of the pentacrinid Seirocrinus subangularis (Miller, 1821) is described from the Red Deer Member of the Fernie Formation in the Rocky Mountains of central-western Alberta. Associated ammonites representing the Stokesi Subzone of the Margaritatus Zone indicate a Late Pliensbachian (Early Jurassic) age for the specimen. Taphonomic features suggest preservation in soft muds on a quiet, oxygen-deficient seafloor, so that the lower surface is preserved intact while ossicles on the exposed upper surface became disarticulated and were slightly disturbed. This occurrence in western Canada represents a major extension of the geographic range of the species.

Type
Research Article
Information
Journal of Paleontology , Volume 65 , Issue 2 , March 1991 , pp. 300 - 307
Copyright
Copyright © The Paleontological Society 

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