GLACIER TYPES OF A WANING GLACIATION 389 



and so may yield a broad neVe", approaching in size a small ice cap, 

 yet without developing definite ice streams except upon its border. 

 Such a glacier is the Illecillewaet glacier of the Selkirks (Fig. 415). 



Again in low latitudes the high and pointed volcanic peaks 

 may push up beyond the snow line into the upper atmosphere, 

 and so become snow-capped. Definite cirques do not develop well 

 under these circumstances, and the loose materials of which such 

 peaks are always composed are attacked in somewhat irregular 

 fashion from the different sides. This is the case of Mount Ranier 

 and similar peaks of the Cascade range of North America. 



Summary of types of mountain glacier. In tabular form the 

 various types of mountain glacier may be arranged as follows : 



MOUNTAIN GLACIERS 



Piedmont glacier. Mountain valleys entirely occupied and largely 

 submerged, with overflow upon the foreland to form a common ice apron 

 through coalescence of neighboring streams. 



Expanded-foot glacier. Valley entirely occupied and an overflow upon 

 the foreland sufficient to produce individual ice apron. 



Dendritic glacier. Valley not completely occupied but with tributary 

 ice streams ranged along the sides of the main stream, and with hanging 

 glacierets separated near the glacier foot. 



Radiating glacier. Glacier largely included in a cirque with subordi- 

 nate glacierets converging below like the sticks in a lady's fan. 



Horseshoe glacier. Small glacier remnants hugging the cirque wall 

 and having an incurving front. 



Inherited-basin glacier. Of form dependent on a basin inherited and 

 not shaped by the glacier itself. 



READING REFERENCE FOR CHAPTER XXVII 



WILLIAM H. HOBBS. The Cycle of Mountain Glaciation, Geogr. Jour., 

 vol. 37, 1910, pp. 268-284. 



