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

Autor:	Patrick Embree, Peter U. Rodda, Michael A. Murphy
Rok vydání:	1995
Předmět:	Ammonite Canyon geography geography.geographical_feature_category Whorl (mollusc) Fauna Paleontology Cretaceous language.human_language Conch Taxon Genus language Geology
Zdroj:	Journal of Paleontology. 69:1179-1182
ISSN:	1937-2337 0022-3360
DOI:	10.1017/s0022336000038166
Popis:	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.
Databáze:	OpenAIRE
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