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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

From: Outcrop-scale fracture systems in the Alpine foreland of central northern Switzerland: kinematics and tectonic context

Fig. 4

Field impressions of widely observed mode-I/mode-II type fractures. a Sub-vertical fractures orientated orthogonal to the bedding and cutting through an outcrop of Upper Malm limestone (Plattenkalk Fm.; outcrop 51). b Close-up view of a bedding-orthogonal fracture in thinly bedded limestones of the Lower Malm Wildegg Fm. (outcrop 30). The original mode-I fracture was filled with syntaxial calcite and later developed into a mode-II type fracture as evidenced by horizontal striations indicating strike-slip movement. See Fig. 1 and in Table 1 for outcrop locations

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