I 22 
SCENERY OF SWITZERLAND. 
Even from a distance we may often see by the 
colour that different moraines, and the two sides of a 
medial moraine, are composed of different rocks. On 
the Aar glacier the left half of the medial moraine 
is composed of dark micaceous Gneiss and Mica 
Schist; the right half of white Granite. The right 
lateral moraine of the Puntaiglas glacier, on the south 
of the Todi group, is made up of dark greenish 
Syenite and Granite, the first medial moraine is of 
titaniferous Syenite, then comes a second of yellowish 
red Rothidolomite with some Dogger; then several of 
bluish black Hochgebirgskalk, and lastly the left 
moraine is of Puntaiglas Granite, and various sedi- 
mentary rocks from Verrucano to Eocene* The 
Baltora glacier in the Hindu Kush has no less than 
fifteen moraines of different colours. The different 
moraines do not mix; and fragments from one side, 
even of the same moraine, never pass to the other, 
but move down with the ice, in the same relative 
positions. 
The glacier often rests directly on the solid rock, 
but in many places there is a layer of clay and 
stones, to which Ch. Martins gave the name of 
“ground moraine,” and if the underlying rock is 
examined it will be found to be more or less polished 
* Heim, Gletscherkunde , p. 348. 
