186 FORMATIONS OF NORTHERN 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, with 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. 
