Fig. 7

a–e Field photographs from RFZ1. The locations of the photographs are indicated on Figs. 3 and 6. a Straight extension veins in Kieselkalk Fm. Size of hiking path sign in the foreground (white rectangle) ~30 cm. b Damage zone of RZF1 in the Kieselkalk Formation. Anastomosing shear zones, fractures and chaotic folds are developed. The straight extension veins present outside the damage zone in the Kieselkalk Fm are fractured and incorporated into the damage zone. Width of view ~1 m. c The RFZ1 separating Kieselkalk Fm in the footwall from Schrattenkalk Fm in the hanging wall. A tectonic lens of Schrattenkalk Fm is present below the major, through-going, sharp fault plane. Hammer in the foreground for scale. d Close-up of main fault plane of RFZ1. In the Schrattenkalk Fm, the main fault plane is accompanied by fine-grained cataclasite and gouge. Stylolites and sheared veins are present in the damage zone of the Schrattenkalk Fm. Pencil for scale. e Thin section photograph of a fine-grained cataclasite derived from the Schrattenkalk Fm cross-cut by a stylolite and several generations of veins. f One of the fault planes of the eastern part of the RFZ1. The fault plane displaces the Seewerschiefer member in the footwall against the Schrattenkalk Fm in the hanging wall by ~1 m. The fault plane is coated with thick calcite and accompanied by minor conjugate faults. Hammer in the centre for scale