66 
SCENERY OF SWITZERLAND. 
horn, Buochserhorn, and others, known as “Klippen,” 
which present problems of great difficulty. 
It has been already mentioned (ante, p. 58) that 
the Nagelflue gravels consist in part of pebbles of 
unknown origin. 
The blocks of granite known as Habkern Granite, 
because they exist by thousands in the Habkern 
valley on the Lake of Thun, belong to a variety which 
does not occur anywhere in the Alps. Prof. Heim 
suggests that they perhaps represent some of the 
Alpine Granite before it was crushed and folded 
during the elevation of the Alps. 
The blocks are sometimes of great size; the 
Berglittenstein on the Grabserberg, for instance, has 
a length of 40 feet.* Another is 105 feet tong by 
90 broad and 45 feet above ground.** In some 
cases they attain the dimensions of small hills, so 
that we have in fact every gradation of size from 
a mere pebble to such a mountain as the Stanzer- 
horn. 
Fig. 92 represents a section of the Roggenstock, 
and it will be seen that the more ancient Triassic 
and Jurassic rocks rest on the more recent Eocene 
* Quereau, Beitr. z. Qeol. d. Schw., L. XXXlii. 
** Murchison, “Structure of the Alps,” Q.J'. Geol, Soc.y 1848. 
