From this point the contact between the two different lithologies is obvious. These are the deposits of pelagic limestones mainly from the Upper Devonian and those of the lower Carboniferous, (350 to 320 million years ago) of the of the Hochwipfel formation. The latter consist of sediments of continental origin (siliceous sands and clays). The presence of Hochwipfel rocks will be even more evident further along the route, up the slope after leaving the ravine.