ICE SHEETS AND GLACIERS 



nivation and not to pressure or rasping by the glacier. 



Curtain Glaciers. — Examples are present on the north 

 side of the Taylor Valley near Solitary Rocks. The 

 glaciers are usually stagnant, and often override de- 

 bris, instead of excavating a valley (see Figure 19 

 at F). 



Valley Glaciers. — Apparently Priestley and Wright 

 include both large and small glaciers, which have 

 carved out a valley, under this general head. The pres- 

 ent writer prefers to subdivide them according to their 

 size and slope, etc. Thus we have among valley 

 glaciers : 



Outlet glaciers — large glaciers of significance in drain- 

 ing the surplus of the Continental Ice to the sea. 



Transection glaciers — tributaries which have linked 

 adjacent outlet glaciers, e.g., near Knob Head and 

 south of Mount Suess. 



Dendritic glaciers — Hobbs' terms for small tributary 

 glaciers, more or less isolated from the main valley 

 glacier, to which they originally were feeders. These 

 may be graded if they have cut down their valleys 

 to the level of the main valley, or discordant if they 

 hang above the main valley. Many cliff and curtain 

 glaciers are of this latter type. It is clear that some 

 glaciers are intermediate in character and can be 

 classified differently according to the stress laid on 

 one or the other criterion. 



Expanded Foot Glacier. — The ice expands below the 

 main outlet valley into a vacant valley below. This 



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