234 



GEOLOGY 



and valleys glaciers there are all gradations (Fig. 195). Occasion- 

 ally the end of a valley glacier, or the edge of an ice-sheet, reaches 

 a precipitous cliff, and the end or edge of the ice breaks off and 



Fig. 191. The medial moraine of the Roseg Glacier, Switzerland. 



Fig. 192. Lefroy Glacier and its junction with Victoria Glacier. L:tk< 

 Louise, C:m:uli:m Rockies. 



