Simplified geological map of the Gorges d’Héric valley, modified from Raynal (2004) and Roger et al. (2020). Letters within black circle correspond to monazite U-Th-Pb ages (Tab. S1; Roger et al., 2020): A: Vialais granite (MN 17/303.6 ± 2 Ma); B: F.G.G. (MN11-59/294.3 ± 2.2 Ma); C: Fine grained gneiss (MN11-57/294 ± 2 Ma); D: Augen Gneiss (MN14-03/314.1 ± 1.3 Ma); E: Fine grained gneiss (MN11-117/445.8 ± 3.8 Ma; MN11- 118/441 ± 2.5 Ma; MN11- 119A/316.9 ± 5.5 Ma-297.3 ± 1.6 Ma); F: Fine grained gneiss (MN11-47/450.6 ± 5.6 Ma-301 ± 4 Ma; MN11-121/294.9 ± 2.9 Ma); G: Fine grained gneiss (MN11-27/294.6 ± 1.6 Ma).

Carte géologique simplifiée de la vallée des Gorges d’Héric (d’après Raynal, 2004 et Roger et al., 2020). Les lettres inscrites dans les ronds noirs correspondent aux âges U-Th-Pb sur monazites (Tab. S1; Roger et al., 2020): A: granite du Vialais (MN 17/303.6 ± 2 Ma); B: F.G.G. (MN11-59/294.3 ± 2.2 Ma); C: Gneiss fin (MN11-57/294 ± 2 Ma); D: Augen Gneiss (MN14-03/314.1 ± 1.3 Ma); E: Gneiss fin (MN11-117/445.8 ± 3.8 Ma; MN11- 118/441 ± 2.5 Ma; MN11- 119A/316.9 ± 5.5 Ma-297.3 ± 1.6 Ma); F: Gneiss fin (MN11-47/450.6 ± 5.6 Ma-301 ± 4 Ma; MN11-121/294.9 ± 2.9 Ma); G: Gneiss fin (MN11-27/294.6 ± 1.6 Ma).