Jurá, a level bent limestone stone mountain range, that extends from the Lake of Geneva to the Rhin, includes a 12% of the surface of the country; the altitude mediates is of 700 meters. It is a zone characterized by plateaus with grass and dispersed towns. In the region of Jurá have been many fossils and tracks of dinosaurios. The region gave its name “to the jurásico” period of the mesozoico. The mounts of Jurá formed 208 ago to 144 million years. Rocks of the jurásico period can be found in numerous sites in the world, but they studied for the first time in Jurá at the end of century XVIII.