GEOLOGICAL SURVEY OF THE TEREITORIES. 



61 



of it, from its peculiarly rugged character, is called the '^DeviFs Slide." 

 The lower part of the mountain facing the river is composed o± light- 



reddish feldspathic quartzites plainly metamorphic, and inclining at a high 

 angle, (Fig. 10.) The valley is here about one-fourth of a mile wide, and 



