244 SCENERY OF SWITZERLAND. 
part of the Bernina mountains, though the actual 
summit is Syenite-Diorite.* 
The Lake of Silvaplana was no doubt once con- 
tinuous with that of Sils. The flat ground on which 
Sils stands is alluvium brought down by the stream 
from the Val Fex. On the left side are Triassic 
strata, the continuation of those already mentioned, 
and beyond them on the left of the lake is Serpen- 
tine. On both sides of the Lake Campfer is Granite, 
and at the lower end Casanna Schist. 
* Theobald, Beiir. z. Geol. K. d. Schw., L. in. 
Surlei 
