CERTAIN PHASES OF GLACIAL EROSION 



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Fig. 8. This crater mountain, which happens to be crossed by 

 the 70th parallel, comprises the north end of Kaago Island. Origi- 

 nally it appears clearly to have been a more or less rounded dome 

 or knob. A cirque starting with snow lodgment high up on the 

 northeast slope of this eminence appears to have worked back 



Fig. 8. — A crater-like mountain top in a more advanced stage of erosion. The 

 outer slopes of the conical mass show the familiar abrasive action of past general 

 glaciation together with the lines of ordinary meteoric erosion. The steep walls of 

 crater-like cirque are due to sapping by localized glaciers of late date. Kaago Island, 

 coast of Norway. Photo, by R. T. C. 



toward the summit by a stoping process until the cirque pit has 

 come to occupy a sub-summit position. The mountain top has 

 been hollowed out and now only a shell remains in place of the 

 former flat-topped mass. It is like a volcanic crater broken 

 down on one side. The inner walls are steep and cirque-like and 

 the crater portion is filled with deep snow. Water erosion is not 

 adapted to this sort of sculpturing. The central basin with cir- 

 cular cirque cliffs gives every appearance of having resulted from 



