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Swiss Journal of Geosciences
Fig. 11 | Swiss Journal of Geosciences

Fig. 11

From: New insights on the Early Cretaceous (Hauterivian–Barremian) Urgonian lithostratigraphic units in the Jura Mountains (France and Switzerland): the Gorges de l’Orbe and the Rocher des Hirondelles formations

Fig. 11

a Uppermost levels of the Rocher-des-Hirondelles Formation in the city-centre of Bellegarde-sur-Valserine (Ain, France) in a building foundation. It presents a reduced section with the staking of the Fort de l’Écluse Member and the Vallorbe Member with its Bellegarde Bed. Both members are separated by an angular and polyphased discontinuity surface D.Ba3-5 separating microporous and tight limestones from a foraminifera-rich grainstone. D.Ba3-5 and D.Ba7 discontinuity surfaces cover more than half of the Barremian stage. b Section and photographies of the nested palaeovalleys of Musinens in the north eastern area of Bellegarde-sur-Valserine, filled with the Bôle Member. This thick sedimentary succession pinches laterally to become D.Ba3-5

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