A Pelean volcano is of the extrusive type, that is to say that it involves a viscous magma, not very rich in gas, building domes. Depending on the viscosity of the lava, the domes can be built according to several shapes.
Description
There are cumulo-domes with steep slopes (Mont Mézenc, Roches de Borée, Montfol, Sépoux, etc.), flattened cumulo-dome (Mont Signon), flowing dome (Les Coux), and protusion or needle (Gerbier de Jonc).
Twelve million years ago, the Ardèche was a veritable pyrotechnic festival. His fiery temperament shapes landscapes
that we can discover today during walks. Mont Gerbier-de-Jonc is one of the most perfect illustrations of this.
Culminating at 1551 m, it is characteristic of this eruptive nature, of this viscous lava transformed into a dome
that the Ardèche people call “suc”: it is also the source of the Loire. A little further, other basaltic cinder cones
mark the horizon, the highest, is Mont Mézenc which raises its pyramidal silhouette on the line of the watershed at
more than 1754 m.
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