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Photographer's Note

The rocks "Tuilière" and "Sanadoire" are situated in the north of the Sancy-massive. They are volcanic plugs which consist of phonolite. This rock gives a metallic sound when it is hit. The magmas were very viscous so they could not disperse laterally out of the crater. Like a piston the lavas rose. They conserved their diameter and formed the rocks. In the case of the rock Tuilière(1286 m) it was a single eruption, in the case of the Sanadoire there were several eruptions.

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Les roches Sanadoire et Tuilière sont deux anciennes cheminées volcaniques usées (ce sont deux volcans différents), séparées par une vallée glaciaire (vallée du Chausse). Elles sont visibles depuis le parking du col de Guerry. Elles ont été dégagées par l'érosion glaciaire. Elles sont proches d'Orcival en Auvergne.

Gerrit, tyro, Noel_Byrne, Cricri, annjackman, macjake, stego, ChrisJ has marked this note useful

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Additional Photos by Jean Jacques Cordier (jjcordier) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 6520 W: 236 N: 11298] (75756)
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