

40 B. N. A. BOUNDARY COMMISSION. 
wabec lying to the northward. <A short distance further westward, on 
an island,a dyke of similar material, also grey, and with pyrites crystals, 
and a large excess of whitish felspar, occurs. It traverses a hard green 
altered rock, with a course of N. 63° E., and probably follows the strike. 
Two miles westward from the first appearance of the intrusive rock, it is 
again seen, and is a whitish granite, with rather large black mica crystals. 
It cuts through a soft dark-green chloritic slate, with a strike of N. 77° 
E., which the intrusion follows, though irregular and lenticular. 
79. Further north, and apparently underlying the last, is a hard close- 
grained slate, with rather irregular cleavage, and a strike of N. 75° KE. 
Beyond this, the rock continues to be highly altered, and of a darker green 
colour, the strike being somewhat obscure, but generally nearly east and 
west. A mile and a quarter south of the southern end of Ka-ka-ke-wahee, 
the rock is hard, green-grey, felspathic, and rather coarse-grained, with 
seales of talc. Strike N. 80° EK. Next this, on the north, is a belt of 
thin-bedded and finely cleavable slate, greenish-grey in colour, and 
chloritic or taleose. It dips N. 5° W. < 80°, a position which appears 
to indicate the northern side of an anticlinal, the axis of which must run 
nearly east and west. This is further confirmed, by the reappearance of a 
rock precisely similar to that last described. Beyond this, to the north, is 
a hard much-altered greenstone conglomerate, with a strike of N. 72° E., 
and on edge. The thickness of this bed is not clearly shown, but it cannot 
be very great, as it is immediately succeeded by a much altered rock, 
probably not a conglomerate, in which a good deal of pale-green horn- 
blende is developed, and which has a nearly vertical attitude with a strike 
of N. 55° E. The narrow belt of conglomerate was not noticed on the 
south side of the anticlinal, but my observations tend to prove that these 
rocks are only locally constant. 
Intrusive Mass of Ka-ka-ke-wabee Island. 
80. The continuity of the strata is here interrupted by the important 
intrusive mass of Ka-ka-ke-wabee Island. The southern point of tho 
island is high and cliff-like, and forms the eastern side of the narrow and 
picturesque passage separating it from the main shore. The rock 
is there a granite, quite similar to that last described, and with small 
cubical crystals of pyrites. It continues to occur northward, on the west 
shore of Ka-ka-ke-wabec, for nearly a mile; but changes its aspect some- 
what, becoming in some places a greyish-red hornblendic granite, and 
including large masses of highly altered siliceous slates, the stratification of 


