The upper Turonian (Cretaceous) Prionocyclus germari Zone of the Vocontian Basin, France, with description of Vocontiiceras vocontiense nov. gen. et sp. (Collignoniceratidae, Ammonoidea) Fr  ed  eric Diebold a, * , Peter Bengtson b , Cyril Baudouin c , Karl-Armin Tr € oger d , Jacqueline A. Lees e , Didier Bert f a Laboratoire Rh enan de Pal eontologie, 5 rue des Sculpteurs, 67380 Lingolsheim, France b Institut für Geowissenschaften, Universit€ at Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany c 16 rue Fr ed eric Mistral, 26200 Mont elimar, France d Institut für Geologie, Technische Universit€ at Bergakademie Freiberg, Gustav-Zeuner-Straße 12, 09599 Freiberg, Germany e Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom f R eserve Naturelle Nationale G eologique de Haute-Provence, H^ otel du D epartement,13 rue du Docteur Romieu, CS 70216, 04995, Digne-les-Bains, Cedex 9, France article info Article history: Received 30 April 2017 Received in revised form 13 October 2017 Accepted in revised form 22 October 2017 Available online xxx Keywords: Cretaceous Turonian France Ammonites Inoceramids Nannofossils abstract The Prionocyclus germari Zone is recognized for the first time in the Vocontian Basin. The upper part of the “calcaires blancs  a 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 het- eromorph 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 Ger- many. The co-occurrence of Prionocyclus germari (Reuss, 1845) and the bivalve Didymotis sp. in the overlying “gr es 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  a silex” and the “gr es jaunes” is interpreted as a sequence boundary linked to a eustatic rise of sea level. The event is correlated with the flexuosumeDidymotis 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. © 2017 Elsevier Ltd. All rights reserved. 1. Introduction Turonian ammonite faunas of Western Europe have recently been the subject of much attention: the Uchaux faunas of south- eastern France were recently revised and the zonation updated by Robaszynski et al. (2014). New faunas from Haute-Normandie, Aquitaine and the Corbi eres were described by Kennedy and Gale (2015, 2016) and Kennedy et al. (2015). Although Sornay (1950) reported “Schloenbachia aff. germari Reuss” from the “calcaires blancs  a silex” (Fallot, 1885) of the Vocontian Basin, the uppermost Turonian ammonite zone, the Prionocyclus germari Zone of Kaplan and Kennedy (1996), remained unidentified in France, including the Uchaux massif and Touraine, the historical type area of the Turonian Stage. However, recent work on the “calcaires blancs  a silex” (Fig. 1) of the Mont elimareDieulefit area (western Vocontian Basin) has yielded a diverse late Turonian fauna indicative of the Prionocyclus germari Zone (Diebold and Bengtson, 2007). 2. Methods Field work at the Turonian localities near Rochefort-en-Valdaine and Dieulefit described by Fallot (1885) and Sornay (1950) in the * Corresponding author. E-mail address: f.diebold@free.fr (F. Diebold). Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes https://doi.org/10.1016/j.cretres.2017.10.016 0195-6671/© 2017 Elsevier Ltd. All rights reserved. Cretaceous Research xxx (2017) 1e9 Please cite this article in press as: Diebold, F., et al., The upper Turonian (Cretaceous) Prionocyclus germari Zone of the Vocontian Basin, France, with description of Vocontiiceras vocontiense nov. gen. et sp. (Collignoniceratidae, Ammonoidea), Cretaceous Research (2017), https://doi.org/ 10.1016/j.cretres.2017.10.016