

LAKE OF THE WOODS—HURONIAN. 43 
rough surface, the fracture passes indifferently through pebbles and 
matrix, as do also the jointage planes of the rock. It is only on a 
weathered surface that the structure is plainly apparent. This belt of con- 
glomerate was not observed westward, in the vicinity of the main shore 
of the lake, and if it does not thin out altogether before reaching that 
place, is probably but feebly represented. It is possible, however, from 
the attitude of the strata to the north and south of this mass on Lacrosse 
Island, that it may be brought up on the ridge of an anticlinal, the axis 
of which dips away westward. The rock succeeding this northward, 
and forming the northern part of the island, is a whitish, somewhat 
nacreous schist; which, if the last supposition is correct, must represent 
that forming the southern part. 
| 85. The band of slates lying north of the Lacrosse Island conglome- 
rate, was seen also in several places along the main shore, and neighbour- 
ing islands lying to the north-west. The southern part seems to consist 
mainly of soft green and greenish chloritic schists, which are peculiar in 
weathering rough, and showing pitted surfaces. These schists were found 
to have in one place on the mainland, a strike of N. 43° E., vertical, or 
with a high dip north-westward. They are succeeded to the north by 
whitish and greenish thin-bedded silvery schists, and the most northern 
part of the belt there examined, consists of chloritic, but rather hard, 
green schists, with small intercalations of dolomite. The same belt, 
where crossed a few miles eastward, among the islands north of Lacrosse 
Island, appears to be much more altered, wherever exposed to view. It 
is probable, however, that as this is an open reach of the lake, the greater 
part of the softer beds has been removed. Immediately beyond the 
north end of Lacrosse Island, a small island shows hard whitish schistose 
rock, with some greenstone conglomerate. Strike about N. 48° E. 
vertical. Many parallel crack-marks appear, having a course of N. 
80° E. Half a mile further north, a second island shows hard green 
altered rock, with a probable strike of N. 35° E. Still further north, and 
near where the dolomitic zone seen on the mainland should pass, 
according to the strike, a hard green altered rock appears. 
86. This schistose belt is defined northward, on the mainland, by a bed 
of conglomerate which comes to the shore at the end of the large point, 
which, a mile or two north of Lacrosse Island, constricts the width of the 
lake to about two miles. It resembles a breccia, the fragments being of 
all shapes, and varying much in size. They are mostly of quartzite, and 
imbedded in a greenish chloritic base. It dips N. 17° W., at a high 
