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First occurrence of Oriostoma (Gastropoda) from the Middle Ordovician

Published online by Cambridge University Press:  14 July 2015

David M. Rohr  and
Ronald A. Johns
David M. Rohr
Affiliation:
Department of Geology, Sul Ross State University, Alpine, Texas 79832
Ronald A. Johns
Affiliation:
Department of Geological Sciences, University of Texas, Austin 78713
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Abstract

Oriostoma bromidensis n. sp., the oldest reported occurrence of Oriostoma Munier-Chalmas, 1876, is described from the Bromide Formation (Middle Ordovician, Blackriverian) of Oklahoma. The species is also the oldest known representative of the family Oriostomatidae Wenz, 1938. It is one of few gastropods known from the Bromide and is smaller than the widespread and abundant Oriostoma typical of the Silurian.

Type
Research Article
Information
Journal of Paleontology , Volume 64 , Issue 5 , September 1990 , pp. 732 - 735
Copyright
Copyright © The Paleontological Society 

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