Fig. 22

a The Bellegarde-sur-Valserine train station outcrop showing the staked Fort de l’Écluse Member, the Vallorbe Member and its Bellegarde Bed in their type-section. b Focus on the Bellegarde Bed and its brackish to lacustrine brown marls and limestones topped by a last rudists-rich carbonate bed. c Thin section of sample BE6 showing a foraminifera-rich grainstone. d Focus on the strongly bored discontinuity surface D.Ba6. e Focus on the brown brackish to lacustrine sediments penetrated by numerous rhizoliths, and view of a thin section in sample BE1 showing an oncoidal-rich altered packstone with ostracods and charophytes. f Thin section in sample BE2, from the urgonian limestone above, characterized by a foraminifera-rich grainstone. g Focus on the karstic pockets on top of this last urgonian bed, filled with sediments of the above Poet Bed (PDR Fm). As visible in thin section of sample BE3, the top of urgonian bed itself is characterized by a strongly micritised bioclastic packstone