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) | Zendy

Didier Bert | Zendy; Gérard Delanoy | Zendy; Stéphane Bersac | Zendy

Open Access

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)

Author(s) -

Didier Bert,

Gérard Delanoy,

Stéphane Bersac

Publication year - 2011

Publication title -

carnets de géologie (notebooks on geology)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.263

H-Index - 15

eISSN - 1765-2553

pISSN - 1634-0744

DOI - 10.4267/2042/36091

Subject(s) - ammonoidea , humanities , horizon , political science , geography , paleontology , biology , mesozoic , philosophy , physics , astronomy , structural basin

International audienceRecent 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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