Le 26 juillet 2020
Découverte d’une des curiosités géologiques de Chartreuse, la double arche de la Tour Percée dite aussi Tour Isabelle, prétendument la plus longue arche des Alpes. On y accède depuis le col de Marcieu par un sentier discret, volontairement non balisé sur des terrains privés, qui traverse la forêt, remonte un couloir herbeux puis franchit un ressaut rocheux de quelques mètres par un pas d’escalade en IV (protégé par un piton) avant d’atteindre la Tour. C’est alors seulement qu’on découvre la double arche, absolument magnifique avec cette double ouverture faisant face à une paroi percée de 2 cavités circulaires. On peut ensuite rejoindre la crête sommitale de l’Aulp du Seuil par un sentier en corniche sur une vire (un sangle en langage chartrousin), avant de descendre par le pas de Ragris et son itinéraire toujours esthétique à travers la décidément très belle géologie des falaises de ce versant est de la Chartreuse.
les arches et les "yeux du crâne" ne se dévoilent qu'une fois parvenu à l'arche
la double arche (plus grande des Alpes) de la Tour Percée (ou Tour Isabelle) face au crâne aux orbites traversantes
vue depuis le sangle de l'Aulp du Seuil
dans la descente du Pas de Ragris, décidément superbe géologie en ce versant est de la Chartreuse
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