292 THE BEAUTIES OF NATURE CHAP, 
somewhat curved line from the Maritime Alps, 
commencing with the islands of Hyéres, by 
Briancon, Martigny, the Valais, Urseren Thal, 
Vorder Rhein, Innsbruck, Radstadt, and 
Rottenmann to the Danube, a little below 
Vienna, —at first nearly north and south, but 
gradually curving round until it becomes 
S.W. by N.E. 
The central mountains are mainly composed 
of Gneiss, Granite, and crystalline Schists: 
the line of junction between these rocks and 
the secondary and tertiary strata on the north, 
runs, speaking roughly, from Hyéres to Gre- 
noble, and then by Albertville, Sion, Chur, Inns, 
bruck, Radstadt, and Hieflau, towards Vienna. 
It is followed (in some part of their course) 
by the Isére, the Rhone, the Rhine, the Inn, 
and the Enns. One of the great folds shortly 
described in the preceding chapter runs up 
the Isére, along the Chamouni Valley, up the 
Rhone, through the Urseren Thal, down the 
Rhine Valley to Chur, along the Inn nearly to 
Kufstein, and for some distance along the 
Enns. Thus, then, five great rivers have 
taken advantage of this main fold, each of 
ee ee 
ois = nee mmm Se oY he 
