Solid like a Roc de Chère
Geological formations: lapiaz
Several other lapiaz formations are present in this region: the plateau of Parmelan, the desert of Platé in Passy and Margeriaz in the massif of les Bauges.
Where does limestone comes from?
About -130 to -120 million years ago, Roc de Chère was covered by sea. Fossils of the limestone shells of many organisms were formed at this time on the seabed. The soil of the Roc de Chère at this location is composed by limestone from the Urgonian geological period, rich in fossils.
Further on, as shown in the picture, you can notice limestone with small nummulites, an indication of a different formation period.
Nowadays limestone is present in different forms: chalk on the blackboard, snail shells...
Searching for the hidden cave
The largest one is Grand Pertuis (see photo), which means crack, narrow passage between rocks. This cave is only accessible by the lake.
Respect the biodiversity of this fragile environment by staying on the tracks.
The remains of a civilization
Three areas of this type have been identified on the lake of Annecy (two at Sévrier and one at St Jorioz). They are part of the 111 pile-dwelling sites found throughout the Alpine arc and listed as UNESCO World Heritage Sites.
What are these marks on the rock?
The difference between sand- and limestone
Sandstone is a sedimentary rock mainly composed of sand-sized silicate grains. It erodes easily, producing a very acidic grey sand that you can observe at the last belvedere.
Vegetation that grows on the sandstone has therefore a high tolerance for acidity. It is strangely similar to the vegetation of the forest of Fontainebleau, which also grows on sandstone.
Sandstone being an impermeable rock, you can observe more than 30 temporary ponds from autumn to spring on Roc de Chère.
- From the car park, follow the direction “Belvédère de la Crête”. At the viewpoint, a vey short round trip (50 m) will take you to the panorama overseeing the lake Petit Lac, La Tournette on the left, the Massif des Bauges in front of you as well as the beautiful ridge of Montagne d'Entrevernes.
- Take the downhill trail to "Belvédère du Roc de Chère".
- Continue on the right to "Echarvines par la Patte d'Oie". At the intersection of "la Patte d'Oie", turn left, then walk along the golf course on the trail on the right which leads to the car park.
By respecting regulations, you will minimize the impact on natural environments, fauna, flora and participate to preserve nature.
Always be careful and plan ahead when hiking. Asters, CEN 74 can not be held responsible for the occurrence of an accident or any inconvenience on this itinerary.
Cycling: Voie verte du tour du lac d'Annecy (cycling road around the lake of Annecy)
Access and parking
From Annecy via road D909a, follow the direction of Talloires. Pass the village of Menthon-Saint-Bernard, at the hamlet of Echarvines (speed bumps on the road) turn right towards the golf course of Talloires. After 200m park on the right in the large gravel parking lot.
From Doussard, via road D909a, follow the direction of Talloires. Pass Talloires. After the winding uphill passage and at the end of the long straight portion, turn left towards the golf course of Talloires.
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