A Tithonian ammonite and brachiopods from Mt Saleve (Hte-Savoie, France), and their consequences for the stratigraphic and paleogeographic interpretation of the Upper Jurassic

The oldest beds outcropping in the Mt Saleve have in the past been referred to the Kimmeridgian, bur an ammonite found in situ together with some brac hiopods give them a date somewhere in the middle part of the Lower Tithonia n. Recently published interpretation of the local Upper Jurassic stratigrap hy and relationship to the Jura platform have therefore to be revised. The Upper Jurassic succession at Saleve is distinguished by a Tithonian continu ation of a carbonate platform facies prograding basinward, which compares w ell with the similar well-known Bec de l'Echaillon, near Grenoble. An erosi onal disconformity, related by other authors to a fall in relative sea-leve l and interpreted as a type I sequence boundary associated with a large eme rgence of the Jura platform, cannot be referred to the Kimmeridgian-Tithoni an and must lie somewhere in the Lower Tithonian recks above the Gravesia b eds.