The Ruitor Nappe is a Middle Penninic tectonic unit of the Western Alps, extending from the Valle d’Aosta into the Val de Bagnes, where it pinches out between the Zone Houillère and the Siviez-Mischabel Nappe. It is characterized by a polycyclic basement with numerous pre-Alpine relics, covered by Permian clastic rocks. These latter lithologies are in contact with the Permian cover of the Siviez-Mischabel Nappe, so that the tectonic contact that separates these two nappes is rarely recognizable in the field.

Permo-Carbonifère de la nappe du Ruitor.