Pseudotachylytes, cataclasites and mylonites have been reported from gabbros, peridotites and meta-sedimentary rocks from the western part of the Ivrea-Verbano zone in the vicinity of the so-called Canavese Line (Schmid et al., Tectonophysics, 1987; Techmer et al., Tectonophysics, 1992). This contribution aims at clarifying the distribution and the relative/absolute chronology of these fault rocks, in order to reconstruct a rheological (seismogenic-non seismogenic) evolution of the Ivrea crustal section. First results indicate that pseudotachylyte formation is polyphased. Two main stages can be distinguished: one pre-dating Ivrea mylonite formation, the other post-dating it. Each of the main stages can be further divided in several sub-stages. The younger pseudotachylytes were generated along two sets of generation planes: one set parallel to the trend of the Canavese Line, the other one perpendicular to it. Formation of pseudotachylytes is followed by cataclasis events stages which are best preserved in the Balmuccia peridotite body exposed along the Sesia river.