
Pangaea disappeared 250 million years ago. The continents broke apart and an ocean called Tethys was created where the Alps now stand. The local rivers and streams met this ocean, carrying tons of waste, rock tailings, dead animals and trees, all piling up and superimposing at the bottom of the ocean. The more this material accumulated, the higher the pressure on the lower layers. This pressure transformed the scattered matter into what is called sedimentary rock. The ammonite fossil you can see here dates from this period.