128 ALASKA GLACIERS 



77. In each case the point of view is so low that the up- 

 land peaks do not unite in an even sky-line, but other 

 plateau features are brought out. 



The correlation of the Cape Spencer peneplain with the 

 Lynn Canal plateaus brings together very different topo- 

 graphic types, but they are not essentially incongruous. 

 The greater height of the inland district has caused it to 

 be occupied by local glaciers, which have scooped out a 

 system of cirques and rounded valleys, leaving the inter- 

 vening crests angular. The cape district is and has been 

 too low to initiate glaciers, but has been overflowed by 



FIG. 63. UPLAND TOPOGRAPHY NEAR WALKER BAY, BEHM CANAL. 



an ice-sheet originating outside it. It therefore lacks 

 cirques and the sharp crests developed by cirque erosion, 

 but has suffered a somewhat equable reduction of its flat- 

 tish summits. 



In turning attention now to figure 63, we leave the 

 region of Lynn Canal and pass three hundred miles south- 

 ward to the Walker Bay region near Behm Canal. The 

 general height of crests is here 4,000 feet. The even sky- 

 line includes a few sharp peaks, suggesting the cirque 

 sculpture of the northern area, but most of the distant 

 summits and all of the nearer are rounded, as by an over- 



