The upper Turonian (Cretaceous) Prionocyclus germari Zone of the Vocontian Basin, France, with description of Vocontiiceras vocontiense nov. gen. et sp. (Collignoniceratidae, Ammonoidea)

• Verfasst von: Diebold, Frédéric [VerfasserIn]
• Verfasst von: Bengtson, Peter [VerfasserIn]
• Verfasst von: Baudouin, Cyril [VerfasserIn]
• Verfasst von: Tröger, Karl-Armin [VerfasserIn]
• Verfasst von: Lees, Jacqueline A. [VerfasserIn]
• Verfasst von: Bert, Didier [VerfasserIn]
• Titel: The upper Turonian (Cretaceous) Prionocyclus germari Zone of the Vocontian Basin, France, with description of Vocontiiceras vocontiense nov. gen. et sp. (Collignoniceratidae, Ammonoidea)
• Verf.angabe: Frédéric Diebold, Peter Bengtson, Cyril Baudouin, Karl-Armin Tröger, Jacqueline A. Lees, Didier Bert
• E-Jahr: 2018
• Jahr: 6 December 2017
• Jahr des Originals: 2017
• Umfang: 9 S.
• Fussnoten: Gesehen am 02.03.2018
• Titel Quelle: Enthalten in: Cretaceous research
• Ort Quelle: London : Academic Press, 1980
• Jahr Quelle: 2018
• Band/Heft Quelle: 88(2018), Seite 375-383
• ISSN Quelle: 0195-6671
• DOI: doi:10.1016/j.cretres.2017.10.016
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Ammonites
• Sach-SW: Cretaceous
• Sach-SW: France
• Sach-SW: Inoceramids
• Sach-SW: Nannofossils
• Sach-SW: Turonian
• K10plus-PPN: 1691302554

Abstract

The Prionocyclus germari Zone is recognized for the first time in the Vocontian Basin. The upper part of the “calcaires blancs à silex” of the western Dieulefit syncline is characterized by the zonal index and a diverse ammonite fauna, as well as inoceramids of the Mytiloides scupini Zone. The co-occurring heteromorph ammonites Hyphantoceras (Hyphantoceras) flexuosum (Schlüter, 1872) and H. (H.) ernsti Wiese, 2000 suggest a correlation with the Heteromorph Beds and the flexuosum Sequence of northern Germany. The co-occurrence of Prionocyclus germari (Reuss, 1845) and the bivalve Didymotis sp. in the overlying “grès jaunes” suggests a correlation with the Didymotis Sequence of northern Germany. The presence of the nannofossil Broinsonia parca expansa Wise & Watkins, 1983 and absence of younger marker species indicate the upper Turonian to lower Coniacian nannofossil zone UC9c. The boundary between the “calcaires blancs à silex” and the “grès jaunes” is interpreted as a sequence boundary linked to a eustatic rise of sea level. The event is correlated with the flexuosum-Didymotis sequence boundary of northern Germany and can be traced in northern Spain and the Czech Republic. Vocontiiceras vocontiense nov. gen. et sp. of the Family Collignoniceratidae shows a distinct ontogeny: an involute juvenile stage with Reesidites-like ornamentation and a single row of ventrolateral tubercles, and a smooth adult stage with a persistent keel and a short rostrum. The new species probably represents an evolutionary link between the subfamilies Collignoniceratinae and Barroisiceratinae.