202 
SCENERY OF SWITZERLAND. 
appear* that the water once stood some 30 metres 
above its present level. It would then have formed 
one sheet with the Lake of Zug. 
The lake itself, as its form clearly indicates, is no 
simple phenomenon, even like that of Zurich for in- 
stance, but is very complex. The surrounding hills 
Mollasse 
Poiidingnt€s 
iiibllasse marine' 
MoHclssc rouge 
Fig. 138.— Section through the Rigi and Vitznauerstock. 
at the western end are formed of Mollasse, thrown 
as already mentioned into two main arches (Fig. 138) 
running S.E. to N.W. The intermediate trough, or 
synclinal line, between them, passes by Krienz, south 
of Lucerne, crossing nearly the middle of the bay, 
near Ktlssnach, across the Lake of Zug from Immen- 
see to Walchwyl, thence to Egeri, and across the 
* Du Pasquier, Beitr. z. Geol. K. d, Schw.i L. XXXI. 
Eocene 
m 
