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Flims Rockslide
The Flims Rockslide occurred about 10,000 years ago. It is known as the biggest landslide incident in the Alps and the biggest worldwide whose effects are still visible, moving some of rock, about 300 times that of the historic Swiss Goldau landslide. The town of Flims can be found at the line where the slip surface disappears under the debris. North of Flims the rock face of ''Flimserstein'' stands high whereas more westerly the slide surface is clearly visible. South of Flims lies a huge hilly debris area that ever remained a forest as this area is not suitable for farming firstly for its shape and even more for its lack of water. The river Rhine crosses this debris in a gorge called Ruinaulta. The Rhine nowadays is still running in debris which means it has not yet reached its level before the incident.
The highest hill in the debris area is almost higher than Flims at the end of the sliding surface.
== Landscape ==
The top of the slide surface can be found at above sea north of Flims at Fil de Cassons whereas the end of the slide surface lies at about 1100. The covered valley would have been at . The rock is limestone dating from the Mesozoic, including Mergel, the angle of slide is (only) 20° to 25°. Debris covers an area of . Pressure baked the debris together to a somewhat stable rock. Given the river Rhine as a base of the valley the debris is as high as . This debris built a dam for Vorderrhein and created a lake in the Ilanz area. The level of the lake was found to have been at a maximum of above sea level which results in a length of the lake of some .〔() A.v.Poschinger, Angewandte Geologie, Vol. 11/2, 2006 english version〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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