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A new heteromorph ammonite from the Barremian (Cretaceous) of California

Published online by Cambridge University Press:  14 July 2015

Michael A. Murphy ,
Peter U. Rodda  and
Patrick Embree
Michael A. Murphy
Affiliation:
University of California, Davis 95616, California Academy of Sciences, San Francisco 94118
Peter U. Rodda
Affiliation:
University of California, Davis 95616, California Academy of Sciences, San Francisco 94118
Patrick Embree
Affiliation:
2228 Knobcone, Anderson, California 96007
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Extract

The fauna of the lower Chickabally Member of the Budden Canyon Formation, a part of the Cretaceous Great Valley Sequence in the Cottonwood District (Figures 1, 2) of northern California, was described by Murphy (1975). At that time, two specimens of the species described here were known, but they were not complete enough to be identified or classified. Recently, Embree collected three additional specimens from the same horizon that enable us to classify the taxon with the Heteroceratidae. However, the rate of whorl expansion of the cross section of the conch and the open coiling are different from all other Heteroceratidae and we regard it, like much of the associated fauna, as a genus and species endemic to California.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 69 , Issue 6 , November 1995 , pp. 1179 - 1182
Copyright
Copyright © The Paleontological Society 

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