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The occurrence of Mesogean elements belonging to the genus <i>Waehneroceras</i> and <i>Discamphiceras</i> among a fauna with boreal features leads to some paleogeographic considerations. The presence of early <i>Schlotheimiidae</i> in the lower Hettangian raises a phylogenetic remark.","AbstractOtherLang":"La faune d'Ammonites permet de suivre l'évolution spatio-temporelle de la formation des Grès du Luxembourg, dans le NE du Bassin de Paris. La séquence biostratigraphique est définie pour l'ensemble de l'Hettangien. La découverte d'éléments mésogéens appartenant aux genres <i>Waehneroceras</i> et <i>Discamphiceras</i> au sein d'une faune à caractère boréal amène quelques considérations paléogéographiques. 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