202 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 13, 



The next bed {d) is a green calc-grit charged with nummuhtes and 

 orbitohtes. So far all is clearly seen on the sides of the broken 

 ravines descending near Eggerstand. In ascending the Fahnern, or 

 rather in coasting its western face obliquely towards its summit from 

 the ravines above-mentioned, you next pass over a considerable thick- 

 ness of schists and sandstone or flysch, and then reach another and the 

 chief band of nummulite limestone which ranges along to Schwarzen 

 Eck, This is a very green-grained, sandy limestone, which when 

 bruised by the hammer is rendered grass-green, and contains Nuni- 

 mulites globulus, N. globosa and N. millecaputy Boubee, together 

 with Orbitohtes and several forms of Pecten and the usual fossils of 

 the group. 



The inclination of the strata gradually decreasing as the axis of 

 disturbance is receded from, the nummulite bands graduate upwards 

 into other beds of flysch in which no animal forms are visible, and 

 finally towards the summit of the hill into finely laminated, light- 

 coloured calcareous flagstone, on the laminae of which are numerous 

 impressions of fucoids of at least three species, viz. F, Targioni, F. 

 intricatus, and a new species with broad fronds, described by Prof. 

 Briinner as F. Helveticus"^ . 



In relation to these fucoids, I may here observe once for all, that 

 throughout the Savoy and Swiss Alps, and indeed I now believe gene- 

 rally all along the northern face of the chain, they occur in a zone 

 superior to the chief masses of nummulitic limestone. The beds in 

 whi»h they occur are, however, so linked on to the inferior members 

 of the group in numerous natural sections, (there being no instances 

 of dislocations or unconformity between the one and the other with 

 which I am acquainted, except on lines of fault,) that I necessarily 

 consider them to form one natural group with the nummulitic rocks 

 on which they repose. In treating of the flexures and breaks of the 

 calcareous mountains of the Alps, I will hereafter produce a series of 

 transverse sections across the group of the Hoher Sentis, as prepared 

 by M. Escher von der Linth, which in exhibiting the wonderful 

 contortions to which these masses have been subjected will also clearly 

 indicate the order of the strata (see PI. VII.). 



Nummulitic Rocks and Flysch of the Voralberg and Allgau. — 

 Having traced these rocks to the north-eastern extremity of Switzer- 

 land, it became highly expedient to traverse the valley of the Rhine 

 above Bregenz and connect them with similar strata, which Prof. Sedg- 

 wick and myself had described many years ago. In fact, I could not 

 acquire the knowledge of the Savoy and Swiss succession which has 

 now been detailed, without seeing clearly that our former classification 

 of the nummulitic rocks and flysch of Dornbirn in the Voralberg, and 

 of Sonthofen in Bavaria, and of various places in Austria, with the 

 cretaceous system and greensand, must be changed. 



The nummulite beds near Dornbirn on the right bank of the Rhine 

 have here been correctly described as apparently dipping southwards 



* Professor Briinner has also shown that the Fucvm Brianteus (Villa) of the 

 Brian^on on the flanks of the Milanese Alps is identical with a species found in 

 the Gurnigel sandstone or flysch near Berne. 



