of Lake Superior. 241 



point and bay rugged and naked ranges of white conical or steep 

 hills come from the E.N.E. ; and in the bay next on the west, 

 approach the lake with a considerable deposit of sand in 

 front. They are of very white, coarse, and somewhat porphy- 

 ritic, granite, unstratified, and containing very little mica or 

 hornblende. I think it extends along shore for four miles. 

 I observed in it no foreign minerals. From the disappearance on 

 the west, of this granite, the greenstone re-appears ; very pale, 

 and with occasional nodules of its own substance. It has numerous 

 drops of limpid quartz, and much white quartz and calcspar in 

 lumps and veins. Except in patches going N.N.W. it is massive. 

 It constitutes the hills in the rear. About three miles east of the 

 Dog River, a rather sudden change in colour ensues, from an 

 increased proportion of chlorite, the rock becoming of the peculiar 

 green tint, soft, glossy, and marked with minute, parallel, tre- 

 mulous, ridges, running along the breadth of the strata. I have 

 never seen here any chlorite earth, in veins, Sfc, but I do not 

 doubt of its existence in a separate form. Lieutenant Menzies, 

 68th Light Infantry, has shewn me very large masses of it from 

 this lake, which may have been taken hence. In Rainy Lake and 

 the Lake of the Woods, it is in large quantity in a similar green- 

 stone. On approaching the Dog River, the stratification becomes 

 clear, and is in small tracts, W.N.W,, N.W., N.N.W., and N., 

 the dip being perpendicular or easterly. North-west is the pre- 

 valent direction, both here and to the west of Dog River, to within 

 one mile of the crags, when it is decidedly E. and EbN. and 

 for some way along the crags, after having been obscured in 

 the above interval of one mile. Many of the strata about the Dog 

 River contain nodules as about Perquaquia ; some many, others 

 very few. There are here fragments of mountain limestone. 



The crags are of the various greenstones of this region, the 

 moderately pale green prevailing. It is usually without a very 

 evident stratification ; but a little east of the rivulet its layers go 

 N.W. and N.N.W. with an eastern dip. It has many tortuous 

 veins of calcspar and quartz. Somewhat west of the above rivulet, 

 the greenstone, in an amorphous state, intermixes with a granite 



