Fig. 4

Stratigraphic columns of the studied units. Colors as in the geological map (Additional file 1). Stratigraphy of the individual units are based on Michard & Henry (1988) and Gidon et al. (1994), except for the Maurin unit defined in this work. The latter combines the former Aiguilles de Mary and Ceillac-Chiappera units, now labeled sub-units. See text for details. Fn “Flysch noir” (Lutetian ?—early Priabonian); ALP Série de la Bergerie de l’Alpet (Upper Cretaceous–lower Paleogene); MeP “marbres en plaquettes” (detrital calcschist, Upper Cretaceous–lower Paleogene), MRB Sandy marble (Upper Jurassic-Cretaceous), Jm/Js Middle-Upper Jurassic marble, TMS Middle-Upper Triassic dolomitic marbles, breccia and dolostone; TM Middle Triassic dolostone and dolomitic marbles, TRM metapelite and dolostone (Anisian-Ladinian ?), CAR cargneule and tectonic breccia; TW tabular quartzite (Lower Triassic “Werfenian”), QC Quarzitic conglomerate (Lower Triassic–Upper Permian), ANA “Verrucano” quartzite (Upper Permian), AND meta-volcanite, mainly andesite (Permian), BL meta-conglomerate and schist (Upper Carboniferous ?)