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The most sheared rocks of the FMSZ crops out in the core of the shear zone, the outcrop showed here is located along the crest of the Costabella del Piz. They are ultramylonites (fig. 5a) with an amount of matrix over 90%. Foliation is marked by white mica and chlorite. This mineral assemblage is indicative…

The most sheared rocks of the FMSZ crops out in the core of the shear zone, the outcrop showed here is located along the crest of the Costabella del Piz. They are ultramylonites (fig. 5a) with an amount of matrix over 90%. Foliation is marked by white mica and chlorite. This mineral assemblage is indicative of a greenschist facies metamorphism. S-C-C’ fabric is recognizable both at the outcrop scale (fig. 5a) and at the microscale (fig. 5b) and is indicative of a top-to-the SE sense of shear.