HIGH PENEPLAIN 
I2 7 
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 filled with ice; below the 
cirques are short glacier troughs; 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 
