The oldest Ardèche fossils date back to the Carboniferous. The rocks of this period were formed under the equatorial climate of hight plains. Climate and vegetation were favourable to the development of giant insects.
The fossils energy
The Carboniferous is marked by the proliferation of plants with a strong influence on the composition of atmosphere: up to 35% oxygen. Vegetals layers accumulated, the carbon rate rose to form coals, anthracites, etc.