Fig. 8

a Gorges de l’Orbe Formation (dark yellow, upper part of the cliff below the trees) at the type locality, the northern flank of the east–west running Orbe river valley. The boundary with the underlying, light yellow and softer Pierre jaune de Neuchâtel unit of the Grand Essert Formation is sharp. b Nodular, yellow-grey, marly limestones of the Gorge de l’Orbe Formation (location is along the footpath following the southern flank of the valley). Hammer is 33 cm long. c Top of the Gorges de l’Orbe Formation to the left, followed by the limestone-marl alternations of the Marne de la Russille (sensu Conrad and Masse 1989a), and then by the lower part of the Vallorbe Formation to the right. Type locality of the Vallorbe Formation