GREY BOLLS
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Commonly known as "dinosaurs of Dinosaurs", this geological curiosity resulting from a sandstone bench from the South of France, is met in various areas adjacent to Rosans and surrounding areas. These balls and the layer of sandstone contain the same material. The only difference is the degree of cementation of the balls (calcareous cement, accompanied by silica which is deposited around the quartz grains to the point of welding them).
Attention, access to the first site is not indicated on the road. Go gently, and you will see on the right a small road road to follow over a hundred meters. After a steep descent, just follow the path (not take the yaw) straight straight in the woods. A discreet yellow markup on a tree will serve as a marker at the entrance to the path.
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