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The Bathonian Global Stratotype Section and Point (GSSP) is proposed at\udthe base of limestone bed RB071 (bed 23 in Sturani 1967) in the Ravin du\udBès Section (43º 57' 38" N, 6º 18' 55" E), Bas-Auran area, “Alpes de Haute\udProvence” French department. The Ravin du Bès Section, as formal candidate\udGSSP for the base of the Bathonian Stage, satisfies most of the requirements\udrecommended by the International Commission on Stratigraphy: 1) The exposure\udextends over 13 m in thickness. At the Bajocian-Bathonian transition,\udno vertical (bio-, ichno- or tapho-) facies changes, condensation, stratigraphic\udgaps or hiatuses have been recorded. Structural complexity, synsedimentary\udand tectonic disturbances, or important alterations by metamorphism are not\udrelevant constraints. 2) There is a well-preserved, abundant and diverse fossil\udrecord across the boundary interval, with key markers (ammonites and\udnannofossils) for worldwide correlation. The base of the Bathonian Stage\udand Zigzag Zone in Bas-Auran corresponds to the first occurrence level of\udGonolkites convergens Buckman, which coincides with the first occurrence of\udMorphoceras parvum Wetzel. Calcareous nannofossils, as secondary global\udmarker, are present in all beds and allow characterizing the Bajocian-Bathonian\udtransition. 3) Regional analyses of sequence stratigraphy and manganese\udchemostratigraphy are available. Spectral gamma-ray data corroborate an\udEarly Bathonian deepening half-cycle of second order. 4) The criteria of accessibility,\udconservation and protection are assured by the “Réserve Naturelle\udGéologique de Haute Provence”. The Cabo Mondego Section (Portugal) is\udsuggested as the Bathonian auxiliary section and point (ASSP) within this\udGSSP proposal

Formal proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin du Bès Section (Bas-Auran, SE France)