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Mine Gianna: a jump back in history

Ophioliti’s lens
Ophioliti’s lens
© Archivio Ecomuseo delle Miniere e della Val Germanasca (Photo: Serena Maccari)
The amphibolite's insertions present in the tunnel, especially in the marble layers, become more and more abundant the nearer we come to the point of contact among the rocks of the Dora-Maira Massif and the rocks belonging to the the Stratum of the Calcareous schist with Green Stones.
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