376 WILLIAM HERBERT HOBBS 
These four stages are perhaps best illustrated by the Bighorn 
Range, the mass of Snowden in the Welsh highland, the Alps, 
and Glacier National Park (Fig. 10). 
Fic. 8.—Monuments on either side of entrance to cirque above Ptarmigan Lake, 
Glacier National Park. (Photograph purchased of Northern Pacific Railway.) 
