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New findings of the ammonite Rhaeboceras, including a new species, from the Pierre Shale of eastern Montana

Published online by Cambridge University Press:  14 July 2015

Joyce C. Grier  and
James W. Grier
Joyce C. Grier
Affiliation:
Department of Geosciences and Department of Zoology, North Dakota State University, Fargo 58105-5517
James W. Grier
Affiliation:
Department of Geosciences and Department of Zoology, North Dakota State University, Fargo 58105-5517
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Abstract

A third known specimen of the ammonite Rhaeboceras burkholderi Cobban, 1987, has been discovered in the upper part of the Pierre Shale of early Maastrichtian age (Late Cretaceous) Baculites eliasi zone of Dawson County, Montana. This finding extends both the geographical and stratigraphic ranges of the species. In addition, R. cedarense new species is described from the Baculites baculus/grandis zone of the same region, which extends the stratigraphic range of the genus as currently recognized. The new species is a small form of Rhaeboceras that appears to be closely related to and probably descended from R. burkholderi.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 3 , May 1998 , pp. 473 - 476
Copyright
Copyright © The Paleontological Society 

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