










LAKE OF THE WOODS—HURONIAN. 35 
_ follow the strike. Numerous crack-lines are also observable on weathered 
surfaces, and run N. 10° W. Another island near this is composed of 
a similar micaceous rock, which has a dip of N. 40° W. < 60°. Along 
the north-west shore of Flag Island are numerous small rocky islets, and 
half submerged rocks, some of which are composed of black hornblende 
rock with large and numerous red felspar veins, while others are of red 
and greyish granite. It is quite possible that in this part of the region, 
some beds belonging to the Laurentian series, may have been brought 
up in connection with the disturbances due to the intrusion of the 
granite, and appear here with those, the true analogy of which is with 
the Huronian rocks to the north. 
Huronian Rocks North of the Intrusive Mass, to Ka-ka-ke-wabec. 
68. North of the granite mass, and reposing on its edge just east of 
Bucketé Island, a grey, gneiss-like, finely stratified rock appears, dipping 
about north-north-west at angles of from 25° to 30°, and holding—as 
is usual with the rocks in proximity to the granite—many reddish veins, 
chiefly composed of orthoclase felspar. At a distance of two and a half 
_ miles eastward from this, and nearly in its line of strike, a similar rock 
occurs, and is again seen to abut directly on the granite. Its dip near 
the latter is N 20° W. < 45°, and-it continues in a direction at right 
angles to its strike for nearly three-quarters of a mile, at which distance 
it was found to have a dip N. 5° W. < 35°. It is cut by many 
red felspar veins, and one dark hornblende dyke with nearly east and 
west course was observed. The rock, though close-grained and quite 
gneissic in aspect, and of a grey colour, is here evidently a much altered 
conglomerate of the kind abundant further north, which has been called 
greenstone conglomerate. On weathered surfaces the original fragments 
are still quite discernible, forming lenticular areas of coarser texture and 
lighter colour than the uniformly grey matrix. 
69. Overlying this, and forming the islands opposite the southern 
border of the Small Promontory—which extends from the north shore of 
the Inlet about four miles east of McKay’s Island—and also seen on the 
promontory itself, is an important series of quartzites. With the possible 
exception of those lying south of the granite ($56) thése are the most 
extensive on the lake. It is quite probable, indeed, that the beds repre- 
sented in both localities may be the same, and that the granite has 
merely separated them. The southern part of the quartzite, in this 
place, is shattered and traversed by many rusty joints, but nearly white 
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