Micro-adventure " In the land of blue stone"

The rock from Mont Brouilly literally comes from the bowels of the Earth. This rock originated at the bottom of an ocean that was being formed around 370 million years ago. Expulsed by underwater volcanoes, the basalt rock was scattered and therefore formed a new oceanic crust. Later, when two ancient continents collided, this rock was found buried deep in a huge mountain chain. The original rock had been compressed, fractured and then heated by the magma, slowly transforming into metamorphic rock. Then, after dozens of millions of years of erosion, this rock, more resistant than the granite rock around it, made its way to the surface and today forms one of the mountainous peaks.