Fig. 8From: Microstructural characterization of natural fractures and faults in the Opalinus Clay: insights from a deep drilling campaign across central northern SwitzerlandMacrophotographs and microphotographs of strike-slip fault. a Macrophotograph of sample BOZ1_1_619.65 with steep strike-slip fault (dextral). b Macrophotograph of strike-slip fault plane with slickenfibres (CC) and lineation (L1). c Microphotograph of sample BOZ1_1_619.65 shows that the strike-slip fault plane consists of a layer of coarse-grained calcite and slickenfibres (CC) that localise on calcite veinsBack to article page