HIGH PENEPLAIN 127 



The higher summits have a general altitude of 5,200 feet. 

 It is now evident that the sculpture is that characteristic 

 of the work of local glaciers. The sharp peaks overlook 

 cirques, many of them still rilled with ice; below the 

 cirques are short glacier troughs 5 and between the troughs 

 are narrow crests. These glacier troughs are not insig- 

 nificant features the beds of those in the field of view lie 

 1,000 to 2,500 feet below the plane of the high peaks 

 but they are so small in comparison with the great earth 

 block from which they have been hewn that they do not 

 prevent the imagination from restoring its original outlines. 



FIG. 62. UPLAND TOPOGRAPHY NEAR BERNER BAY. 



A deep long glacier trough traverses the view from dis- 

 tance to foreground. It is occupied in part by a glacier, 

 in part by a filling of glacial waste ; and its rock bed is 

 far below sea-level. It is related to the fiords and must 

 be considered in another connection. In the present con- 

 nection it need be thought of only as a trench dividing 

 the upland, and helping, through contrast, to exhibit the 

 upland's plateau character. 



Other illustrations of the plateau dissected by Lynn 

 Canal and its branches are to be seen in figures 75 and 



