THE REUSS. 
22 I, 
with totally different rocks; the whole physiognomy of 
the landscape is entirely different. 
In fact we find ourselves in a valley of another 
character, and belonging to a different order of things. 
We have left a transverse, and find ourselves in a 
longitudinal, valley; we have left a live, and find our- 
selves in a dead, valley. The Urserenthal is a part 
of the great longitudinal Rhine-Rhone fold which 
traverses Switzerland from east to west, cut off as it 
were by the Furka from the Rhone, and by the 
Oberalp from the Rhine. It is geologically a deep 
trough of Secondary strata (see Fig. q vol. i. p. 67) 
forming a fold in the crystalline rocks. The width 
of the Urserenthal is partly due to the softer char- 
acter of the sedimentary rocks. Above Andermatt 
is a small w'ood, which has been left as a protection 
from the avalanches. 
Above the Gallery on the left side of the Reuss, 
and in the Teufelsthal itself on the right side, there 
is a layer of Sericitic Gneiss about 300 metres thick. 
The Protogine ceases at the south opening of the 
Urnerloch, and is followed by about 500 metres ot 
Chloritic and Sericitic, often Quartzose, vertical Schist, 
which encloses a compressed trough of Secondary 
rock (Triassic and Jurassic). The Oberalp road is on 
