Buchumschlag

Systematic palaeontology of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France), and its implications for biostratigraphy

This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France). Emphasis is placed on new and poorly known Himalayitidae, Neocomitidae and Olcostephanidae from the lower part of the Jacobi Zone auctorum. Significant results relat...

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Bibliographische Detailangaben
Hauptverfasser: Frau, Camille (VerfasserIn) , Bulot, Luc G. (VerfasserIn) , Wimbledon, William A. P. (VerfasserIn) , Ifrim, Christina (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2016
In: Acta geologica Polonica
Year: 2016, Jahrgang: 66, Heft: 2, Pages: 175-204
ISSN:2300-1887
DOI:10.1515/agp-2016-0008
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://geojournals.pgi.gov.pl/agp/article/view/25488
Verlag, lizenzpflichtig, Volltext: http://dx.doi.org/10.1515/agp-2016-0008
Volltext
Verfasserangaben:Camille Frau, Luc G. Bulot, William A.P. Wimbledon and Christina Ifrim
Beschreibung
Zusammenfassung:This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France). Emphasis is placed on new and poorly known Himalayitidae, Neocomitidae and Olcostephanidae from the lower part of the Jacobi Zone auctorum. Significant results relate the introduction of Lopeziceras gen. nov., grouping himalayitid-like forms with two rows of tubercles, and Praedalmasiceras gen. nov., grouping the early Berriasian Dalmasiceras taxa. Study of the ontogenetic sequences of both genera show that they were derived from late Tithonian Himalayitidae. This supports the distinction between the subfamilies Himalayitinae and Dalmasiceratidae subfam. nov. Content, variation, dimorphism and vertical range of the Neocomitidae Berriasella, Pseudoneocomites, Elenaella and Delphinella are discussed. A conservative use of the Olcostephanidae Proniceras is followed herein.
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Beschreibung:Online Resource
ISSN:2300-1887
DOI:10.1515/agp-2016-0008

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