150 SCENERY OF SWITZERLAND. 
of 3 km., at the MOnch of 11., and to this distance 
the older and underlying Gneiss has been regularly 
folded over, so that it now lies upon the younger 
and originally upper strata. The Jungfrau wedge is 
regarded by Heim as the western continuation of the 
fold of the Windgalle. It had been supposed by 
some authorities that the Gneiss was thrast over the 
Jurassic, but Baltzer is clear that the inversion is due 
to folding and not to overthrust. 
In some cases the Calcareous rock seems to be 
forced into the gneiss; this, however, is due, not to 
eruption, but to kneading and squeezing. 
Further to the west these great folds are well shown 
in the valley of the Aar. At and above Meiringen 
(see Map opposite), the valley is excavated through the 
Jurassic strata, in which the celebrated gorge of the 
Aar has been cut through a belt of rock known as 
the Kirchet. Immediately above the Kirchet is a 
narrow band of older (Triassic) Sedimentary rock, 
and then we come to gneiss, the line of junction 
having the usual south-east and north-west direction. 
Further up the valley, however, is a second belt of 
Jurassic age, capping the Laubstock on the west and 
the Pfaffenkopf on the east, but cut through by the 
valley; while still further up, but at a greater height 
and consequently further from the valley, tliere is a 
