246 Dr, A. P. Young— Glaciation of Navis Valley. 
area of the Navis Valley, we have for the probable height of the 
snow-line— 
Metres. 
On slopes with north aspect under the Schafseiten ridge 2250 or 2300 
At the Griibl with west aspect . : 2400 
Slope with south aspect under Schober Spitz 2350 
Slopes with east and south-east aspect under Mieselkopf about 2350 
SrmPLte AND Compound CorRIEs. 
The corries under the Schafseiten Spitze are so simple in form that 
they may have been excavated during a single stage of glaciation. 
The dams being still intact, it is clear that the stand in question was 
made in the course of the last retreat of the ice, marking a late phase 
in the Wiirm period of Penck. An earlier period is out of the 
question; the dams formed would have been swept away by the ice in 
the following advance. 
At the Griibl, the great cirque under the Tarntal, the conditions are 
more complicated, and only to be explained on the assumption that 
the work of excavation commenced during one of the earlier glaciations. 
The rear wall of this cirque is over 300 metres in height. The whole 
of the water draining from the Upper and Lower Tarntal collects 
under the screes and reaches the Griibl in the form of big springs 
which come to the surface little above the floor of the cirque. | 
rie ’ / 
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staffelsee 
Scale of kilometres. 
Fie. 2. Sketch-map of the Tarntal area. 
b, c, d, brow ot steep slope, forming the present rear wall of the Grubl; e¢, f, 
supposed position of the head of the rear wall of the older simple corrie ; hy knolls 
of schist and ‘ Hisendolomit’ at the lip of the Griibl. 
