352 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vou. VIII. 
to say just how they stand in relative age with the other rocks, but I have 
placed them in the same relative position as the Wawa tuffs whose age 
has been pretty well fixed. Along the north shore of the lake they occur 
intermingled with the green schists and though they appear to be inter- 
bedded with the latter the close folding is probably responsible for this 
condition. 
The opalescent quartz crystals stand out prominently from a fine 
grained indefinite ground mass of iron compounds and feldspar. The 
iron is in the form of hematite and carbonate, either siderite or ankerite, 
the carbonate giving a very active effervescence with hydrochloric acid. 
Thé carbonate appears to have given rise to the oxide by oxidation. 
An analysis of a specimen of this rock taken south of Whitefish Lake gave 
twenty per cent. of iron, mostly in form of hematite. 
The distribution of these schists is quite general, but they are found 
in small quantities. No doubt they were widespread at one time, but 
owing to their greatly weathered condition they have largely disappeared. 
Their strike corresponds closely to that of the associated rocks, being 
about 70 degrees in the southern part of the region, and east and west in 
the northern part. 
THE IRON RANGES. 
When Dr. Coleman had worked over the iron ranges on Sand Creek 
and Sturgeon River it was expected that the three rather distinct ranges 
found there would be continued beyond the basic eruptive sheet to the 
northeast. This proved to be only partly correct. On Sand Creek 
and the Sturgeon River the ranges are clearly separate, and one is a con- 
siderable distance from the other two, while near Wendigokan there are 
no such definite ranges, the outcrops being more scattered. The two 
districts are alike in respect to the presence of jasper and hematite in all 
of the bands and of magnetite in two of the bands of each district. The 
formation of magnetite must be ascribed to some local reducing agent, 
probably carbonaceous matter, as there are no such conditions as those 
Dr. J. M. Bell reports as always present where magnetite was found in the 
Michipicoten region, viz., excessive metamorphism or the proximity of 
some intrusive mass, which had caused reduction by heat effects. During 
last summer, while working in another region, I saw several dikes cutting 
the iron range, and in every case’the formation close to the dike contained 
magnetite instead of the red jasper found a short distance away on either 
side of the dike. It is probable that the carbon contained in the black 
slates which are so closely associated with the jasper in the Wendigokan 
