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Maastrichtian Ammonites from the Biscay Region (France, Spain)

Published online by Cambridge University Press:  11 August 2017

Peter D. Ward  and
W. James Kennedy
Peter D. Ward
Affiliation:
Department of Geological Sciences, AJ-20, University of Washington, Seattle 98195, U.S.A.
W. James Kennedy
Affiliation:
University Museum, Oxford University, Parks Road, Oxford OX1 3PW, United Kingdom
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Abstract

Maastrichtian sediments exposed in the Bay of Biscay region at coastal sections at Zumaya and Sopelana, northern Spain, and Hendaye and Bidart, France, yield the most diverse Upper Maastrichtian ammonite faunas yet recovered. Thirty-two species/subspecies referred to 21 genera are described, one of which, Anapachydiscus terminus, is new. The ranges of all taxa are fully documented and provide the basis for a four-fold division of the uppermost Campanian and Maastrichtian, with zones of Pseudokossmaticeras tercense (oldest), Pachydiscus (P.) epiplectus, Anapachydiscus fresvillensis, and A. terminus (youngest). This represents the most refined, and first properly documented, ammonite zonation for the Maastrichtian of western Europe, and can be directly correlated with the belemnite zonation developed for the white chalks of northern Europe. The extinction of the last ammonites, documented here, occurred at relatively high standing diversity and appears to have been sudden and catastrophic.

Type
Research Article
Information
Journal of Paleontology , Volume 67 , Issue S34: The Paleontological Society Memoir 34: Maastrichtian Ammonites from the Biscay Region (France, Spain) , September 1993 , pp. 1 - 58
Copyright
Copyright © 1993, The Paleontological Society 

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