

LAKE OF THE WOODS.—LAURENTIAN. 29 
greenish hornblende schist recurs. It dips north at an angle of 55°, and 
_a few hundred yards further northward become vertical. Near the bottom 
of the bay the rock is still hornblende schist, vertical, and greenish in colour, 
with an approximate strike of N.55° W.; showing a great thickness of these 
hornblendic rocks. A mile and a half westward in the line of strike tho 
same schist appears, with a nearly east and west strike, and is immediately 
succeeded to the south by intrusive granite, possibly an extension of the 
last mass. This is followed by grey gneiss, strike, N. 83° E. Rather over 
a mile north-west of this the prevailing rock is again a hornblendic schist, 
which appears to be partly micaceous in places, and has adip 8. 18° W. < 
50°. This rock, in following the shore, is immediately succeeded by well- 
marked gneiss, which appears to be stratigraphically inferior to any rock 
seen since leaving North Island. It constitutes the shore and islands for at 
least two miles. Its colour is usually grey, and in one locality it showed 
a direction of strike N. 45° W., andadip at high angles to the southward. 
In some places it is granitoid, and so massive as to give no well-defined 
direction of strike or dip. Near the point where this compact gneiss 
disappears, the shore begins to trend rapidly to the north, sweeping round 
the end of the promontory dividing Sand-hill and Clear-water Lakes. 
This change is closely followed by the strata, which show a simultaneous 
tendency to alter their strike toward the same direction. The rock again 
changes to a hornblendic schist, with a dip of S. 40° W. < 60. This rock 
is probably the representative of the thick series of hornblendic schists 
mentioned as occurring in the first bay west of North Island. It becomes 
micaceous westward, and includes some gneiss bands ; and constitutes the 
shore for about two miles, having in two places where observations were 
made, dip 8. 60° W. <. 50°, and S. 45° W. < 60. 
54. Westward from this place, the rocks assume a quite different ap- 
pearance, and belong, as I believe, to an area of much-altered Huronian 
which lies to the south of the great North-west Angle intrusive mass. The 
actual junction between the two formations at this point is concealed by 
water, but they show a remarkable appearance of conformity, the next 
rock seen, being a soft greenish slate, with a dip of S. 60° W. < 45°. It 
is worthy of notice that similar apparently conformable junctions of Laur- 
entian and so-called Huronian rocks have been noticed by Prof. Bell, as 
occurring on the Albany River at Martin’s Falls, and also in the neighbour- 
hood of White River.* 

* Report of Progress Geological Survey of Canada, 1871-72, p. 110, and 1870-71, p. 345 

