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Like many large, crustal-scale faults, the Median Tectonic Line (MTL) in SW Japan has a long history of movement, having been active predominantly as a strike-slip fault since the mid-Cretaceous. Fault rock exposures in the core of the MTL preserve a history of deformation at a range of mid- to shallow-crustal depths. Ryoke mylonites 1–4km north of the main contact record deeper level, Cretaceous...