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Ammonite faunas from two Cenomanian outcrops in the “Chaînon du Pech de Foix” (Ariège, France), Sèzenac and the Cluse de Péreille, provide the first records of the guerangeri (lower Upper Cenomanian) and jukesbrownei (upper Middle Cenomanian) zones in the North-Pyrenean Cenomanian.
Dans le bassin du Sud-Est de la France, la sédimentation est épaisse et continue (faciès Terres Noires) à la limite Dogger-Malm. Cette situation est exceptionnelle en Europe occidentale. L'étude de la succession des faunes d'ammonites permet de proposer une résolution biochronologique égale à l'horizon d'ammonites, soit environ 150.000 ans. Le contact Dogger-Malm est bien visible dans les coupes de...
La faune d'ammonites des series affleurantes du Bathonien-Callovien du Boulonnais (Nord de la France) est decrite en detail pour la premiere fois. Au Bathonien moyen et superieur les specimens sont rares, reduits a quelques Perisphinctidae (Procerites) et Clydoniceratidae (Clydoniceras, Delecticeras). L'abondance et la diversite des associations augmentent au Callovien ou elles ont un net cachet subboreal...
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