THE VALAIS. 
II9 
and were at one time managed by Charpentier, who 
resided at the village of Devens. 
The Dolomite and Gypsum, which are generally 
considered to be Triassic, are especially susceptible 
to the action of weather and water; hence the riveis 
(as, for instance, the Grand Eau), and the Cols (as, 
for instance, the Col de P^llon between the upper 
valleys of the Grande Eau and the Sarine, those of 
la Croix, Kinmeun, Fnittlisspass, etc.) have a tendency 
to follow the outcrop of these strata. Ihe Gypsum 
also often gives rise to swallow holes, sometimes of 
considerable size. The little lake of Plambouit, which 
is said to be very deep, occupies one of these de- 
pressions.* When the Gypsum occupies high ground, 
it weathers into peculiarly pointed peaks, like those 
of the Dolomites. 
From the lake to Bex the valley is wide and 
* Renevier, Beitr. z. Geol. K. d. Schw., L. XVI. 
