Fig. 9

Mesoscale structures. a F2 fold in meta-limestone of the Ceillac-Chiappera subunit, a folded S1//S0 surface is recognizable; b Vallon de Chillol quartzite, an old S1//S0 foliation folded by an open F2 fold. The F2 fold axis is verticalized by subsequent F3 folding; c F3 minor folds in the Middle Triassic low-grade marbles of the Aiguille de Chambeyron unit; Fig. 7d is taken in the hinge of one of these folds; d S2 crenulation cleavage in a F3 hinge (white patches are lichens); e Minor F3 parasitic fold of Monte Maniglia D3 syncline in the Combe-Brémond unit; S3 foliation describes a cleavage fan with respect to the fold axial plane; f S4 foliation developed locally in a fine grained quartz–phyllite level (Roure unit)