Fig. 16

Simplified stratigraphic column of the “Série de la Bergerie de L’Alpet” (Le Guernic, 1966; and this work). The succession is represented as observed and mapped in the type locality (see Additional file 1, where it is overturned and affected by blueschist-facies metamorphism). Thickness and heterometry of the breccia undergo strong lateral variations. The distinction between the black schists belonging to the “Série de la Bergerie de l’Alpet” and those referable to the Schistes Lustrés nappe is often hard in the field where serpentinite lenses are missing in the thrust contact. The black calcschist layer following the “Marbres Chloriteux” is compared by Le Guernic (1966) to the Eocene Flysch Noir. Three lithotypes are showed in the pictures on the right: a Grey sandy marble = “Calcaires à Lauzes”; b Quarzitic meta-arenite = “Permien reconstitué” (Lemoine, 1961); c Carbonate-rich breccia with millimetric to decametric dolostone clasts