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. 
