In this sector of the Eocene basin there are currently rocks, nearly 37 million years old, that bear witness to the withdrawal from the sea and the great evaporation that left behind an enormous amount of salts (evaporite rocks) that have been exploited since 1912, especially potash (sylvite), putting Súria at the centre of Catalonia’s mining culture. Witnesses of the formation of the Pyrenees, which are reachable from here, are also part of the geological heritage present in this area of the park.