A. V. Jennings — The Landicasser and Landqimrt. 267 



district are cut out of a mass that probably once stretched across the 

 valley, and was heaped up against the slopes of the Einnerhorn. 

 We have here an amply sufficient amount of material to have 

 supported the lake. The fad of the former southerly extension of 

 the lake is generally accepted and perhaps undeniable/ but there 

 seems no other way of accounting for its existence than that here 

 suggested. 



Secondly, as to the nature of the Wolfgang- Drusatch barrier. 

 When I made the suggestion above referred to I based my con- 

 clusions on physiographic grounds only. The form and position of 

 the mass and its overgrown character, offering a striking contrast to 

 the bare and weathered Todtalp of which it has been regarded as an 

 extension, suggest anything but an ancient ridge of rock exposed to 

 denudation since Pre-Glacial times. It is evident that an immense 

 amount of material must have been removed from the east of the 

 Todtalp ; yet we do not find great accumulations of serpentine in the 

 lower valleys. Evidence of extensive glaciation is, as Theobald 

 specially noticed, abundant on the upper Todtalp slopes. What, 

 then, is more natural than to suppose that the removed material 

 was piled up in this position ? Added to this, the difficulty of in 

 any other way accounting for the lake and other features of the 

 valley seemed to me conclusive. 



Since then I have spent some months in studying the solid 

 geology of the neighbourhood ^ and find that the results of this 

 totally difi'erent line of inquiry are confirmatory of my former 

 opinion. Thus the serpentine baud undoubtedly occupies a 

 constant position between certain rocks : it follows, that is, the 

 strike of all the other formations. Its outcrop runs iyom between 

 the Schiahorn and the Weissfluh down the Meierhoferthali, and 

 obliquely across by Wolfgang to Laret ; it reappears on the east of 

 the Lareterthal at Eiiti, and crosses the Upper Landquart valley to 

 Monbiel. The line of strike thus excludes the icTiole of the Wolfgang- 

 Drusatch harrier. If that mass were composed of rock in situ it 

 would not be of serpentine, but of crystalline schists, limestone, and 

 ' verrucano ' ; a continuation of the rocks of the Dorfliberg and 



1 I have been several times asked what date may he attributed to the former 

 extension of the lake towards Frauenkirch, but I am not aware of any evidence on 

 which conclusions can be based. The infilling of the old lake by detritus from the 

 mountain sides and material brought down by the streams must have been going on 

 since its earliest days, but it is probable that the final disappearance of standing water 

 from parts of the Davos level is a very recent matter. The peat at the southern end 

 seems modern, and above the Davos -Frauenkirch road the talus slopes contain 

 a considerable quantity of peaty material near the surface. At the northern end, I am 

 told that the Fluela discharged into the lake within the memory of those still living. 

 It is said also that the Eomans used the Fluela Pass as a route between the Pratigau 

 and the Engadine, and the finding of Roman remains at Drusatcha suggests that 

 they traversed the ridge at that point and passed round the shoulder of the 

 Seehorn. This is not likely to have been their route if they could have crossed in the 

 neighbourhood of Dorf. The name Wolfgang itself is said to represent the fact that 

 the ridge formed the path of wolves from the eastern mountains, and this also seems to 

 suggest that the foot of the Fluela valley was recently closed by the waters of the lake. 



^ The results of this survey are embodied in a paper read before the Geological 

 Society on May 10th, 1899. 



