THE BERNESE OBERLAND. 
149 
This remnant of Jurassic rock, originally over- 
lying, but now folded into the Gneiss, can be traced 
from the Jungfrau to the Petersgrat, on the northern 
flanks of the Ebnefluh, the Mittaghorn, Grosshorn, 
Breithorn, and Tellispitzen. It does not, however, 
extend through the mountain, but is, so to say, a 
wedge folded into it. Moreover, the wedge is itself 
folded, and contains two inner wedges of Eocene 
rock, which reappear near the hotels at Murren, on 
the other side of the Lauterbrunnen valley. 
Seen from the north the mountain appears as a 
wall of Calcareous rock, with a summit of Gneiss. 
The total height is 4167 metres, of which about 
800 metres is gneiss, the base being Upper Jurassic. 
The structure of the Mdnch* is simpler, but it 
also belongs to the region of overfolded gneiss, which 
has a thickness of goo metres, resting again on 
the Jurassic. The upper surface of the Calcareous 
rock is not horizontal, but inclined at an angle of 
about 20°. 
In both cases the cap of gneiss is part of the 
great fold, and was originally continuous with the 
gneiss to the south and south-east. The Eiger, on 
the other hand, is a typically Calcareous mountain. 
In the case of the Jungfrau the fold has a depth 
* Baltzcr, Beitr. z. Geol, K, d, Schw., L. xx. 
