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Two occurrences of the genus Pictetia (Early Cretaceous, Albian, Ammonoidea) in California

Published online by Cambridge University Press:  14 July 2015

Peter U. Rodda  and
Michael A. Murphy
Peter U. Rodda
Affiliation:
California Academy of Sciences, San Francisco 94118
Michael A. Murphy
Affiliation:
University of California, Davis 95616
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Abstract

Two specimens of the Cretaceous genus Pictetia Uhlig, 1883, have been found in the Cottonwood District, northern California, the first record of this genus in North America. The larger specimen is a septate whorl fragment from the Brewericeras hulenense zone that is associated with Douvilleiceras mammillatum. It is identified as Pictetia sp. The smaller specimen is a septate fragment of one and a half whorls from the Oxytropidoceras packardi zone associated with Cleoniceras. It is identified with the type species, Pictetia astieriana Orbigny, 1842, previously recorded from Europe. A review of the genus Pictetia suggests that species assigned to the genus have an open coil with a rounded dorsum. The occurrences of these Tethyan elements in the Albian fauna of the Cottonwood District suggest easy communication for many Cretaceous taxa between northern California and the Tethyan realm of Europe, the Caucasus, and Madagascar.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 3 , May 1992 , pp. 435 - 439
Copyright
Copyright © The Paleontological Society 

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