Vol. 51.] ELUVIO-GLACLAL DEPOSITS IN SWITZERLAND. 



369 



28. On Fluvto-Glacial and Interglacial Deposits in Switzerland. 

 By C. S. Dn Riche Preller, M.A., Ph.D., F.G.S., A.M.I.C.E., 

 M.I.Elect.E., E.C.S. (Read March 20th, 1895.) 



Contents. 



Page 



I. Introduction 369 



II. Deposits near the Lakes of Zurich and Constance 37 1 



III. Deposits near the Lake of Zug 375 



IV. Deposits near the Lake of Thun 378 



V. Conclusions 383 



I. Introduction. 



In a paper published in the Geological Magazine for January 1894, 

 I showed that the Swiss Alps had been visited not only by two, but 

 by three general glaciations, of which the first may be referred to 

 Pliocene, the second to Middle Pleistocene, and the third to Upper 



Fig. 1. 



GENERAL PLAN OF LAKES 



ZURICH, ZUG, AEGERI 



AND LUCERNE. 



Greifen 



Lake A 



Pfaffikon 





.Zurich 



^s.0% 



^\Lake 





v\409m 



\^% 



OWetzikon 





l @| r " 



<? 6 











ODumton 





\^<L 



"^ 







1 \_^^ 



^^J? 





• 7 







O 



-J..L 



\ 



« >— "-- >^ 



Uznaeh 



Du Richc Preller Del. <j„\\ Scale: 1:1.000,000 = 



■0633 inch to 



xxxxxx Crest-line of divide of drainage-urea. the mile. 



• • • Fluvio -glacial and ivterglacial deposits. 

 Altitudes in metres above sea-level. 



Pleistocene times. The evidence consists chiefly in a number of 

 glacial and so-called fluvio- glacial deposits which I had examined 

 iu the Swiss lowlands, and notably in the vicinity of the Lake of 



2d 2 



