Late Cretaceous fault in the Buc de Nubiera (“Cloudy Peak”, 3219 m a.s.l.), Châtelet nappe, Upper Ubaye valley. A: South-facing fault escarpment cutting across the Upper Jurassic limestones; the calcschists (dark) include blocks of limestones. By place, Fe-Mn hardground overlies the fault escarpment. B: Neptunian dykes filled with calcschists in the hanging-wall of the fault about 200 m from (A). Courtesy of J.-P. Bouillin (2022); see also Claudel et al. (1997).