9218 THE BEAUTIES OF NATURE CHAP, VI 
Hence denudation will act with more effect 
on the upper than on the lower portion 
of the folds, and if continued long enough, 
so that, as shown in the above diagram, the 
dotted portion is removed, we find the origi- 
nal hill tops replaced by valleys, and the origi- 
nal valleys forming the hill tops. Every 
visitor to Switzerland must have noticed hills 
where the strata lie as shown in parts of Fig. 
18, and where it is obvious that strata corre- 
sponding to those in dots must have been origi- 
nally present. 
In the Jura, for instance, a glance at any 
good map of the district will show a succes- 
sion of ridges running parallel to one another 
in a slightly curved line from 8.W. to N.E. 
That these ridges are due to folds of the 
earth’s surface is clear from the following 
figure in Jaccard’s work on the Geology of the 
Jura, showing a section from Brenets due 
south to Neuchatel by Le Locle. These folds 
-are comparatively slight and the hills of no 
great height. Further south, however, the 
strata are much more violently dislocated and 
compressed together. The Mont Saléve is the 
remnant of one of these ridges. 
iin tt tia ii 
