Couleurs d'automne - a photo on Flickriver

Couleurs d'automne

Deux roches, vestiges de deux volcans.

Il n’en reste plus que la cheminée (Tuilière) et un morceau de cône (Sanadoire) séparés par une vallée en auge. Elles marquent la limite entre les Monts Dores et le massif de la Banne d’Ordanche et émergent dans le cirque du Chausse, au pied du col du Guéry. Elles bornent la vallée Fontsalade (en auge) et sont formées par deux culots de lave qui furent dégagés par le glacier qui occupait le cirque.

Les prismes réguliers, nés du lent refroidissement de la lave, se délitent en plaques minces et régulières, les lauzes. Elles furent longtemps exploitées pour couvrir les toits des maisons et des églises dans un large périmètre, donnant ainsi son nom à la roche Tuilière.

La roche Sanadoire, “roche sonnante”, car la phonolite résonne quand on la frappe, culmine à 1290 m. Elle a porté jusqu’au XVe siècle un château réputé imprenable. Il servit de repaire aux mercenaires (routiers), amenés par les anglais, qui ravagèrent la contrée pendant la guerre de Cent Ans. Un effondrement de la partie sommitale (certainement dû au tremblement de terre de 1477, qui secoua fortement la région et endommagea la Basilique d’Orcival), en a complètement effacé les traces.
[source : Auvergne Volcans Sancy www.auvergnevolcansancy.com/villages/roches-tuiliere-sana...]

Bonne journée.
Merci pour vos visites et commentaires

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Two rocks, remains of two volcanoes.

All that remains is the fireplace (Tuilière) and a piece of cone (Sanadoire) separated by a trough valley. They mark the limit between the Monts Dores and the Banne d'Ordanche massif and emerge in the Cirque du Chausse, at the foot of the Col du Guéry. They border the Fontsalade valley (in a trough) and are formed by two lava pellets which were released by the glacier which occupied the cirque.

The regular prisms, born from the slow cooling of the lava, disintegrate into thin and regular plates, the slate. They were used for a long time to cover the roofs of houses and churches in a large perimeter, thus giving its name to the Tuilière rock.

The Sanadoire rock, “sounding rock”, because the phonolite resonates when struck, rises to 1290 m. It carried a castle deemed impregnable until the 15th century. It served as a den for the mercenaries (road), brought by the English, who ravaged the region during the Hundred Years War. A collapse of the top part (probably due to the earthquake of 1477, which strongly shook the region and damaged the Basilica of Orcival), has completely erased its traces.
[source: Auvergne Volcans Sancy www.auvergnevolcansancy.com/villages/roches-tuiliere-sana...]

Have a nice day
Thanks for your visits and comments.

Taken in: France / Auvergne-Rhône-Alpes / Issoire / Servière (show map)

Taken on: October 24, 2021

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