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Auvergne Rhône Alpes

Métropole de Lyon

Poleymieux-Au-Mont-D'Or

Passage between the rocks

Auvergne Rhône Alpes

Métropole de Lyon

Poleymieux-Au-Mont-D'Or

Passage between the rocks

Highlight • Other

Passage between the rocks

Hiking

5.0

(15)

Location: Poleymieux-Au-Mont-D'Or, Métropole de Lyon, Auvergne Rhône Alpes, France

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Tips

March 3, 2026

Hiking

These rocks, which suddenly appear after crossing a small meadow, are surprising. They resemble a mille-feuille pastry. They are of geological interest, consisting of layers of Sinnemurian limestone (Jurassic period, 190 million years ago) containing gryphaea oysters. Gryphaea oysters are a type of oyster that were found in very large numbers at the time (the region was, of course, underwater).

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Mont Thoux Nord – Mont Thou loop from Poleymieux-au-Mont-d'Or

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#3.

Gambins Spring – Mont Thou loop from Poleymieux-au-Mont-d'Or

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Details

Informations

Elevation 410 m

Weather

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Monday 28 September

29°C

14°C

0 %

Additional weather tips

Max wind speed: 15.0 km/h

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See nearby routes

Location: Poleymieux-Au-Mont-D'Or, Métropole de Lyon, Auvergne Rhône Alpes, France

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