Structural Geology and Lithology
The outcrop in the southern part of the Aosta Valley is bounded to the south by the Insubric line. On the other side of this steeply dipping fault zone is the Ivrea zone, which is geologically part of the Southern Alps. The Sesia zone is (just as the correlated Dent Blanche nappe) tectonostratigraphically on top of (ophiolitic) Zermatt-Saas zone of the Penninic nappes.
The Sesia zone has a penetrative foliation because it has seen a large amount of shear during exhumation. It is therefore hard to reconstruct any older structures. It can however structurally be divided in three parts: an external, an intermediate and an internal zone. The internal zone is structurally the highest unit and is next to the Insubric line.
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