Kaserc 
THE OUTER-ALPS. 
53 
the north-west of the Mattstock in the Sentis, where 
(Fig. 83), the Urgonian (U) is reduced from its normal 
thickness of 220 metres to 30 metres, or to ^th, the 
Gault from 70 metres to 10, and the Seewerkalk 
from 100 to 12, or to ’th. On the northern limb of 
the Gulmen Arch the Seewerkalk is reduced to 
of its original thickness, while elsewhere the strata 
form mere shreds or detached lens-like masses, and 
finally in some cases disappear altogether.* 
In Schardt’s opinion the Mt. Cubli, Moleson, 
Rochers de Naye, etc. form a great overthrust con- 
tinued in the Chablais on the other end of the lake, but 
cut across by the great transverse valley of the Rhone. 
Burckhardt, Beitr. z. Geol, A. d. Schw.^ L. xxxii. 
