AX0 CIRQUES EN XOKWAI AND GKEENLAM). 



17L 



with .special reference to these ; this theory elucidates the whole. 

 The moraines, which are terminal, indicate the limit to which the 

 the glacier has advanced daring some period of the Glacial epoch ; 

 the lakes occur along this line because they have been made by the 

 glaciers. 



The occurrence of these lakes behind the moraines is so regular 

 that many years ago Professor Keilhau, who had no idea that the 

 banks in front of them were moraines, or their basins formed by 

 glaciers, expressly stated that this regularity was too marked to be 

 accidental. The above relation between lakes and rows of moraines 

 is repeated several times in Xorway. Different rows of moraines 

 and lakes there belong to different extensions of the glaciers : for 

 example, from 30 to 40 kilometres to the north of the aforesaid first 

 row of lakes there is, near the town of Drobak, another series of 

 lakes and moraines. Further to the north is found a third series ; 

 but the largest lakes in Xorway occur in the fourth row, which 

 includes the lakes of ITjosen, Eandsfjord, Spirillen, Kroderen, and 

 Soneren. In front of these lakes, which are situated in valleys, the 

 loose detritus takes the form of terraces, like those mentioned above 

 in front of the lakes in the fjord-valleys of Western Xorway. 



The heights and depths of the above lakes are given in the follow- 

 ing Table : — 



Xame of the lake. 



© 





© 



M 



© 



M 



c3 



c3 





© 



i— » 



© [> 



A 



a 



pC o 



-t-i 





■*-> ■— i 



Cm 

 O 



"is 







o 



-U 02 



fcD 



cS 



fcC > 



H 



© 





© 



<1 



i— 1 c3 



kilo- 

 metres. 



kilo- 

 metres. 



metres. 



99 



364 



121 



73 



131 



132 



25 



35 



151 



39 



38 



132 



10 



7 



118 



© 

 M 



O 



g § 



c -5 



© 



o © 



^ © 



±> © © 



"©.5 a 



Mjosen .... 

 Randsfjord 

 Spirillen . 

 Kroderen . 

 Soneren 



metres. 



452 



108 



108 



31 



40 



metres. 

 195 

 200 

 200 

 190 



When the first-mentioned row of moraines and lakes was formed 

 the ice-masses were yet continuous. For this reason the configura- 

 tion of the country here is without strongly marked valleys, and the 

 moraine is, on the whole, continuous. When the last row of large 

 lakes was formed, the ice-sheet had separated itself into distinct 

 glaciers, owing to which the detritus in front of the lake cannot be 

 followed from the end of one lake to another. 



From these observations it results that about fifty lakes or rock- 

 basins, among which are some of the largest in Xorway, have mo- 



