Plate 71 



Locking south along ridge between Middle and Slesse creeks, Skagit Range. View 

 illustrates glacial and frost attack on ledges above tree-line. 



Southern slope of Mount Ripple, Selkirk Range, showing one of the most extensive 

 felsenmeers in the Boundary belt. The absence of continuous forest-cap 

 permits rapid streaming of rock-waste. 

 25a— vol. iii— p. 638. 



