THE VALAIS. 
I4I 
but mainly issues from a beautiful blue arch, now 
(1895) nearly in the middle of the glacier face, and 
some 25 metres high. The lower glacier is some- 
what spoon-shaped, with radiating crevasses. Above 
it is a fine icefall, of which a splendid view is ob- 
tained from the road over the Furka; above the fall 
is a flat expanse of ice, ending in a great snow- 
field. 
The Furka is a deep trough with gneiss on each 
side and Jurassic strata in the centre, marmorised 
by pressure, and containing Belemnites and Penta- 
crinites. 
The synclinal is continued along the Urseren- 
thal, and goes, deep down, having been found with 
little change in the tunnel of the St. Gotthard Rail- 
way. 
