Fig. 2

Examples of the four different fault sets in the Rawil depression. All locations named on the photographs are indicated in Fig. 1b. a Fault set 1: NE-SW striking normal fault developed on the normal limb of a NW verging anticline in the frontal part of the Wildhorn nappe. b Fault set 2: NE-SW striking normal faults and mega-joints in the Gemmi pass area (e.g. Ustaszewski et al. 2007). c Fault set 3: ENE-WSW striking vertical strike-slip faults close to Sion in the Rhone Valley. d Fault set 4: WNW-ESE striking fault in the frontal part of the Wildhorn nappe, which is one of the two faults described in this study (RFZ1). The RFZ1 cuts through already folded sedimentary protoliths such as limestones, marls and sandstones. Slickensides on fault planes point to an oblique slip vector with SSW-side-down and dextral sense of movement (black arrows). The RFZ1 offsets the fold axis of a major pre-existing syncline (axial plane trace indicated on photograph), which can be used to estimate the total displacement across the fault zone (see "Estimation of displacement across the Rezli fault zones" and Fig. 5). Sk Schrattenkalk Formation, Kk Kieselkalk Formation