Fig. 3 

Harmonised stratigraphic chart of the Western Internal Jura FTB showing potential décollements (white arrows) and the main décollement (black arrow) based on Rusillon (2017) and Brentini (2018) (1), Strasky et al. (2016) (2), Donzeau et al. (1997) (3), Charollais et al. (2006) (4), Laubscher (1965), Philippe et al. (1996), Schori et al. (2015), Aufranc et al. (2017), Sommaruga et al. (2017), Rime et al. (2019) (5). The stratigraphic compilation allows to harmonise the existing and different geological maps of the study area and to propose a new detailed geological map (Fig. 5). This harmonisation helped to constrain and build the shallow structures in the initial cross-section (Fig. 7) through the Western Internal Jura. The stratigraphic log shows the lithologies and competences of each member, defined by the French terminology. The corresponding HARMOS formations (Fm) grouping the French members are derived from Rusillon (2017) and Brentini (2018). Uncertainities of these correspondences are specified by a question mark. The lithological legend used in the detailed geological map (Fig. 5) refers to the Harmos formations. The average thicknesses (Av. thick.) used in sections and model building are the results of a stratigraphic compilation based on well data, outcrops and stratigraphic works (Brentini, 2018; Charollais et al., 2007; Rusillon, 2017, and references therein). In the cross-sections and the 2D kinematic forward model, thin layers were grouped together (per example, c1P-V with c1G). The older lithologies have been grouped by age due to the classification uncertainty already mentioned in Rusillon (2017) and Brentini (2018). The section and model units are represented by the black separation lines. Per. Period, Quat. Quaternary, Up-Low. Upper-Lower Cretaceous, Ceno. Cenomanian, Pliensb. Pliensbachian, Sine.-Hett. Sinemurian—Hettanginian, Alt. inf. Alternances inférieures, Calc. Calcaire