ON THE NORTHWEST SHORE OF LAKE SUPERIOR. 383 



ascending the river. On the northwest side of this ridge, beds of volcanic grit and 

 breccia (Nos. 140, 141), are found dipping to the northwest. The beds are thick, 



GORGE AND FALLS OF KAMANOSISATIKAG. 



with perpendicular joints. The upper layers, as exposed in a mural precipice at 

 the river, are very amygdaloidal. Some of the cells are lined with a thin coating 

 of green carbonate of copper. (No. 142.) 



About two hundred yards higher up stream No. 139, again comes up, with an 

 intercalated bed of No. 137, and dips to the southeast as before. Where it emerges 

 from beneath the amygdaloid, several cascades are formed, the entire fall being in 

 all about twenty feet. As this rock extends up the river, the lower part becomes 

 thinly laminated, and assumes a grayish colour, while the upper beds still continue 

 purplish. (No. 138). 



Beyond this point, for the distance of three miles, the rocks are concealed by 

 high hills of red clay and marl, which slope down to the margin of the river. On 

 the east side of the river, we ascended a ridge of greenstone (No. 143), the summit 

 of which is over seven hundred feet above the lake-level. This ridge, which is 

 about six miles from the Lake, is so heavily timbered, that the view is rather con- 

 tracted ; but from a point about two-thirds the distance up, a good view was ob- 

 tained of two chains of hills to the west, both of which have high perpendicular 

 escarpments on the northwest side. From the foot of this ridge, the slope is about 

 three miles to the nearest point on the Lake, and in that distance is an exposure of 

 No. 144, and a dike of greenstone. 



