Fig. 2

General field conditions and criteria for the kinematic analysis of outcrop-scale fracture systems in Northern Switzerland: a Late Jurassic limestones (here Villigen Fm.; outcrop 19) are typically characterized by closely spaced bedding-orthogonal fractures. b Hardly any fractures are observable in less competent marls and claystones (here: marls of the Lower Freshwater Molasse; USM; outcrop 40). c Horizontal stylolite structures on a (in this case) vertical fracture plane. These so-called slickolites are the most common shear sense indicators observed in the study area (outcrop 9). d Slickenfibres that were comparatively rarely observed (outcrop 1). See Fig. 1 and in Table 1 for outcrop locations