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The Great Landslide:
At the end of the last Ice Age, the period known as the Würm Glaciation, a tremendous mass of boulders fell from the slopes of Flims Mountain and Piz Grisch in a southerly direction down to the bottom of the valley. Across a distance of three kilometres, these masses of rock must have thundered down to the ground at high speed. Nowhere in the Alps has there been a landslide of such enormous proportions. One can imagine what a tremendous power the masses of rock must have had. This force knocked the displaced material on the other side of the valley, on the slope of Versam and Valendas, upwards again. Part of the landslide mass was pushed up-river, the other part was pushed out of the valley almost as far as Reichenau.
The glacier masses of the late Ice Age then spread once more into the present-day valley floor of Reichenau and Tamins, and covered the area of the landslide. When the Rhine Valley glacier finally shrank back, as well as the rock from the landslide there was a pile of moraine rubble. Behind this high, extensive mass of stone a great lake backed up. It stretched westwards as far as Tavanasa. One day it burst out to the east. It must have disappeared in a fairly short time. At this point, the young Rhine ate deep into the loose landslide rock.
Today the bed of the Rhine lies up to 400 meters below the heights of Conn and Flims to the north and those of Versam and Valendas to the south. The fantastic rock formations of the bright stone in the steep gorges are unique and striking. We should also however pay some attention to the course of the Rhine itself, the greenish water of which flows in long loops through the valley floor. Almost untouched, fresh and airy, the woods invite us to go in. In the water meadows along the Rhine they are mostly deciduous trees and bushes, with conifers dominating on the upper slopes. No road goes through the gorge. Only the narrow-gauge railway line sticks to the curves of the right bank. This landscape was formed by a prehistoric cataclysm, and what is left reminds us of what happened here aeons ago.