INFLUENCE OF STRATA UPON SCENERY. 
275 
climbed up to the summit. Along the valleys of the 
Niremont — Pleiades which abut on the Lake of 
Geneva at Montreux, the debris from the two sides 
meet in the middle, and attain a great thickness. 
One of the finest examples is that at the foot of the 
Diablerets, which rises from 2035 metres to about 
2400 metres.* 
The Glarnisch is nearly surrounded by rockfalls 
on its northern and eastern sides. They are mostly 
of interglacial age, and to one of them the Klon- 
thalsee is due. 
In the debris of rockfalls the edges of the stones 
remain fresh and angular, on many of them the sur- 
faces show marks of blows, rubbing, hollows, and 
impressions, where they clashed against one another 
during the descent. They lie in wild confusion, 
large and small together, from fine dust up to rocks 
larger than a house. In some cases the originally 
loose materials have been subsequently cemented to- 
gether into a breccia. The surface is very irregular, 
and often contains lakes, as, for instance, at Sierre 
in the Valais, and Flims on the Rhine. 
4 
The rockfall of Goldau from the Rossberg which 
* Renevier, Beitr . z. Geol . K. d. Schw L. xvi. 
18* 
