The Dichotomus Horizon: proposal for a new biochronologic unit of the Giraudi Zone of the Upper Barremian of southeastern France, and considerations regarding the genus Imerites Rouchadzé (Ammonoidea, Gassendiceratinae) - Université de Bourgogne Accéder directement au contenu
Article Dans Une Revue Carnets de Géologie / Notebooks on Geology Année : 2011

The Dichotomus Horizon: proposal for a new biochronologic unit of the Giraudi Zone of the Upper Barremian of southeastern France, and considerations regarding the genus Imerites Rouchadzé (Ammonoidea, Gassendiceratinae)

Didier Bert
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Stéphane Bersac
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Résumé

Recent revisions of the genus Imerites Rouchadzé make it possible to introduce a new biochronologic horizon to define more precisely the lower boundary of the Giraudi Zone: the Dichotomus Horizon. Using the concept of 'interval zone', this new horizon maintains the current lower boundary of the Giraudi Zone as accepted by authors, and thus contributes to the stabilization of the Barremian zonal system. This stabilization is also strengthened by abandonment of the use of "Crioceras" cristatus d'Orbigny (nomen dubium) that ought not be used as an index species in detriment of Imerites giraudi (Kilian). The classification, origin, and intraspecific variation of the genus Imerites Rouchadzé are examined.
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hal-00557591 , version 1 (19-01-2011)

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Didier Bert, Gérard Delanoy, Stéphane Bersac. The Dichotomus Horizon: proposal for a new biochronologic unit of the Giraudi Zone of the Upper Barremian of southeastern France, and considerations regarding the genus Imerites Rouchadzé (Ammonoidea, Gassendiceratinae). Carnets de Géologie / Notebooks on Geology, 2011, CG2011 (A01), pp.1-12. ⟨10.4267/2042/36091⟩. ⟨hal-00557591⟩
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