

LAKE OF THE WOODS—HURONIAN. 39 
from the promontory, they are represented on a small island off the main 
shore, by a soft, green, chloritic schist with a strike of N. 70° E. and ver- 
tical. About a mile further westward, and opposite the mouth of the 
third large bay, the rock is a thinly laminated soft mica-schist, silvery on 
the faces, with a dip of S.58° E. < 70°. The same bed, a short distance 
further on, forms the high rock called Picture-rock Point; and is there 
seen perfectly vertical, with its line of strike parallel to that of the shore. 
A large island lying behind the point, and within the mouth of the bay, 
shows much-altered greyish-green rock, abutting against an important 
granitic mass, which gives off other minor dykes nearly parallel to its own 
direction. The altered rock, has a dip of N. 42° W. < 70°, and the gra 
nite appears pretty nearly to followits strike. The granite has a rather 
deep red colour, from its felspar, which is largely in excess. It is also 
-hornblendic, the hornblende being black, and forming crypto-crystalline 
aggregations in the felspar. In its general appearance it much resembles 
some parts of the intrusive granite of the North-west Angle. 
78. Picture-rock Point, is so named from the remains of Indian devices 
marked upon the broad flat surface of the slate in red paint. A mile north- 
west from it, the same thin-bedded bright slate, still forms the shore, the 
direction of the strike and that of the coast-line nearly coinciding. Two miles 
from the same point, and still nearly on the same geological horizon, is a 
finely laminated greenish-grey talcose schist, lying very straight and even, 
vertical, and with a strike of N. 58° E. Three and a quarter miles from 
Picture Point, and still following the shore, the rock is a grey altered 
slate, vertical, and with a strike of N.55° E. Beyond this, for a short 
distance, greenstone is seen, but it is not very clear whether it is intre 
sive, or contemporaneous. A mile beyond the last locality, a rather 
massive quartzite comes out on the shore, dipping S. 23° E. at an angle of 
55° in one place, but generally nearly vertical. It apparently underlies 
the schists and slates just described, but no rock precisely resembling it 
was seen in any other part of the lake. It is very pure, translucent, light 
greenish-grey, with occasional thin fibres of chloritic matter. It weathers 
a dead white, and is traversed in the bed by innumerable joints and seams. 
Beyond this the slates become considerably altered, from proximity to in- 
trusive masses and dykes, which are about on the same horizon as those 
described in Picture Point Bay, and may continue behind the line of the 
coast to this place. Therock is here, however,a rather imperfect granite, 
grey in colour, with rounded white felspar crystals, and small cubical 
erystals of iron pyrites, It resembles the intrusive mass of Ka-ka-ke- 


