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LAKE OF THE WOODS.—HURONIAN. 31 
W. < 60°—N. 13° W. < 45°, and N. 5° BE. < 58°. It forms with 
the rocks still further west, a series with a nearly east and west strike, 
and northerly dip, toward the intrusive mass. " 
57. South of the last mentioned locality, on the southern side of the 
belt of islands, the rock, which must considerably underlie those just 
spoken of, is a hardened chloritic slate of dark-green colour, including thin 
belts of gneiss-like material, which although parallel to the strike, may be 
intrusive. These rocks have a dip N. 12° EH. < 60°, and formhigh 
bold islands. They are very probably the return on the southern side of 
a synclinal of those Huronian beds of similar appearance, which were first 
described, and which, about four miles to the north-east were found 
dipping south-westward off the flanks of the Laurentian. 
58. Three and a half miles east of the north end of Flag Island, rocks, 
overlying the last, consist of dark micaceous schists, dip N. 10° W. < 
45°. In the islands to the west, the schist is replaced by hard dark- 
green altered rocks, which probably hold a somewhat higher place in the 
series. The islands to the north, are composed of light-coloured granitic 
rocks, the line of junction between which and the green rocks, is every- 
where covered by water. These green rocks generally yield only an 
approximate dip or direction, but were found to give in two places N. 12° 
W. < 45°, and N.5° W. < 60°. Near the western extremity of the 
Huronian area, they compose a large island lying immediately east of 
Flag Island; and on crossing a passage three quarters of a mile wide to 
the latter, the rock changes to compact pinkish intrusive granite ($64). 
A little tongue of much altered and contorted green rock, occupies the 
eastern shore of Flag Island for a few hundred yards, and seems to be the 
outlying end of a minor synclinal fold, the greater part of which has been 
removed by denudation. A similar outlyer of the same rock rises above 
the lake as a small water-washed islet, in the southern part of the bay 
south of Flag Island, and may extend westward under the. low shore of 
the bay. 
59. The general character of the rocks of this area of much-altered 
Huronian, is quite different from that of the typical Laurentian of other 
parts of the lake. They are softer, and more schistose and slaty, and give 
a different appearance to the country, and a more ragged and broken 
character to the shore. Dark green shades are prevalent, the most prom- 
inent mineral constituent of many of these altered rocks being green 
hornblende, generally crypto-crystalline, and often occurring with scarcely 
a trace of felspar. From the evidence of other rocks surrounding the 
