180 



FORMATIONS OF 



N O II T II E R N 



MINNESOTA. 



scenery on all the principal streams flowing into the northwestern portion of Lake 

 Superior. 



In the further descent down these streams, the great slate system of Lake 

 Superior, indicated on the map by a neutral tint, Avith its associate traps, appears in 

 the form of abrupt precipices, of many hundred feet, facing usually the east and 

 northeast on the main shore, and the northwest on the adjacent islands. This 

 geological feature is well illustrated by the contour of M'Kay's Mountain, as it 

 looms in the distance from the mouth of the Kaministiquia. 



