THE VAr.AIS. 
I 27 
thickness of which is not known. When, therefore, 
the lake was at its highest it possibly extended to 
Brieg. To the east of Martigny is another belt of 
Crystalline rocks, while some little distance up the 
Dranse, at Sembrancher, we come again upon Jurassic, 
the eastern prolongation of the Jurassic synclinal of 
the Val Ferret. The valleys of laddes and Chable owe 
their origin to the softer Carboniferous (Anthracitic) 
strata. 
Fig. 112. — Transveree profile of the Gorj'c of the Lizeme. 
Fig. 1 1 2 represents a section of the valley of the 
Lizerne, which falls into the Rhone at Ardon below 
Sion. 
The following section (Fig. 1 1 3) shows the remark- 
able contortions of the strata on the great south 
wall of the Diablerets seen from the Tour d’Anzein- 
daz. The summit here marked as Pointe de la 
Houille is perhaps more generally known as the Tete 
Ronde. 
