392 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 9, 



eastern side. Between Isehl and this head of the lake, the valley of 

 the Traun is comparatively narrow ; and though its widening above 

 Eben See is no doubt in some way due to the entrance of the Frauen 

 Weissenbach, there is no appearance of an important glacier having 

 descended that glen ; nor, from the elevation of the mountain above it, 

 should we expect to find any. Nor is the rock in this neighbour- 

 hood more easily eroded than that further up the stream ; for it is all 

 Hauptdolomit, and the head of the present Traunsee is also cut 

 through the same and Dachsteinkalk, the mountains for some 

 distance on either shore rising very precipitously. The lower end of 

 the lake, however, lies among hills corresponding with, and of the 

 same formation (Wiener Sandstein and Tertiary deposits — Marine 

 Schichten) as, the same parts of the Mondsee and Atter See ; yet, 

 as in the case of these, there is no very marked expansion of the 

 lake-basin. 



Drift evidently retains the waters at their present level ; and it 

 forms elevated plateaux, which rise at least 200 feet above the lake, 

 and through which the Traun has cut a deep y-shaped gorge. There 

 are several sections exposed of this drift ; it is very distinctly 

 stratified, with false bedding ; the pebbles are for the most part 

 limestone (or dolomite), varying in size up to about 5 inches in the 

 longest diameter. There are also occasional blocks (more especially 

 in the upper part), whose solid contents cannot be less than a yard 

 cube. The drift extends over a great distance to the north and 

 west, and is cut out into well-marked terraces and combes, which, it 

 may be remarked, sometimes appear to have but little connexion 

 with the existing drainage-system. Evidently, as is shown by its 

 terraced shores, the Traunsee has once stood at a higher level, as is 

 the case with the other lakes. The valley of the Traun, from the 

 Hallstadter See to Lauffen, and from that place to the former head 

 of the Traunsee, has been filled with Alpine drift, which has been, 

 and in places is still being, cut out into terraces. 



Besides the above lakes, there are several smaller, of which I have 

 only had distant views, as well as the extensive Chiemsee*. All 

 these, however, lie among soft Cretaceous or Tertiary rocks, or the 

 drift of the Bavarian plain. 



One other lake, not strictly lying within the limits of my district, 

 must however be briefly mentioned in conclusion. This is the 

 Zeller Seef , situate in a tributary to the great Pinzgau valley ; into 

 this it opens from the N., almost opposite to the mouth of the 

 Fuschthal, which descends from the Glockner group. This lake 

 lies in a well-marked trough-like valley, bounded by summits rising 

 perhaps 5000-6000 feet above the sea. This joins another sys- 

 tem of valleys to that of the Pinzgau ; two of them run nearly 

 parallel to it. Into the Pinzgau the waters of the lake are dis- 

 charged over a level plain of drift, while these other valleys 



* Nearly 12 miles long and 9 wide, 1638 feet above the sea, and 2S3 feet 

 deep. 



f About 2461 feet above the sea, 363 feet deep. Nearly 4 miles long and 1§ 

 wide. 



