36 



GEOLOGICAL SURVEY OF CANADA. 



Huronian. 



Schist- 

 conglomerate. 



Grey mica- 

 schist. 

 Magnetic iron. 



Garnets. 



Huronian on 

 God's Lake. 



Schist on 



Touchwood 



Lake. 



Huronian. The large trough of Huronian schists, &c., in which 

 Oxford and Knee Lakes are included, was described in my report for 

 1878. The strata of the eastern part of the former lake consist of 

 greyish micaceous and more or less calcareous schist-conglomerate, its 

 pebbles, which are well rounded, consisting mostly of granite and 

 opaque white quartz. On Eat Eiver, a short distance south of the old 

 Wesleyan Mission of Jackson Bay, the strike of this rock, which is of 

 the same variety as that of Oxford House, is east and west, and the dip 

 southward at an angle of 86°. The same conglomerate is found also 

 at the head of Trout River, but farther down the stream, is mostly 

 grey mica-schist without pebbles. I found beds of magnetic iron ore 

 interstratified in siliceous slates where Trout River falls into the head 

 of Knee Lake, and not Tar from this locality Mr. Cochrane observed 

 the calcareo-micaceous schist-conglomerate, holding granite pebbles, 

 associated with finely crystalline black hornblende schist, full of dull 

 garnets as large as peas. No new facts were noted in regard to the 

 Huronian rocks of the shores of Knee Lake. 



Mr. Cochrane's specimens and notes show that on the shores of the 

 larger division of God's Lake, rocks which we may consider Huronian, 

 occur a short distance west of the outlet, at the eastern extemity and 

 on both sides of the Narrows. About a mile west of the outlet there 

 is a compact, dark, greenish-grey diorite with small quartzite pebbles, 

 running S. 80° W. (mag.) and dipping northward, and on an island 

 about three miles further west dark greyish-green dioritic schist occurs, 

 dipping S. 40° W. Compact dark greenish-grey diorite with a little 

 calcspar in the joints, occurs around the bay at the eastern extremitj^ 

 of the lake. The strike is in various directions, and the dij) at different 

 angles from 45° upwards. At the extremity of the first long point on 

 the south-east side of the lake, or about eight miles from the bottom of 

 the bay just referred to, the rocks run nearly east and west, and consist 

 of dark grey felsitic schist, thickly spotted with whitish felspar, giving 

 it a porphyritic appearance, together with a nearly black finely crys- 

 talline hornblende schist. On the same side of the lake, three miles 

 north-east of the Narrows, dark green crystalline diorite occurs, with 

 calcspar in the joints. It holds iron pyrites and small veins of quartz. 

 Two miles nearer the Narrows the rock on an island is a massive grey 

 mica schist with glassy spots. The dip is here southward at an angle 

 of 50°. In the Narrows it consists of grey felsitic schist, showing 

 very fine lines of stratification and dipping N. 30° E. < 85°. 



A dark greenish-grey felsitic hornblende-schist occurs on the eastern 

 part of Touchwood Lake, and a similar rock was found on a small 

 island in Clear-water Lake. About the middle of the south-east shore 



