896 REVIEWS 



iron ranges at Shining Tree Lake, Clear Lake, Sault Ste. Marie, 

 Aberdeen Additional, Batchawana Bay and northward, Michipi- 

 coten Harbor, and the Helen mine, all in Ontario. As a result 

 of this work it is possible to greatly extend the areas of Lower 

 Huronian iron formation rocks in Ontario. Their general distri- 

 bution is stated by Coleman as follows :' 



It has long been known that the Vermilion iron range of Minnesota 

 crossed the boundary into Ontario at Hunter's Island, and jaspery iron ores 

 have been found at various points in that region — e. g., by W. H. C. Smith 

 on Jasper Lake, where banded jasper and hematite have a width of forty or 

 fifty feet. Brecciated jasper and iron ore are known from the Mattawin 

 region also, and from a number of points to the north, as noted by Dr. Bell ; 

 but in the latter case the deposits may be of Animikie age, and therefore not 

 to be included here. 



In the band of Huronian mapped as running eastward from Lake Nipigon 

 in the direction of Long Lake, a deposit of banded jasper and iron ore has 

 been examined by Mr. J. Watson Bain, near the mouth of Black Sturgeon 

 River, and an extension of it is reported from the same stretch of Huronian, 

 north of Long Lake. To the south of this, ten or twelve miles from the 

 mouth of Pic River, the other type of deposit is found, brecciated granular 

 silica with magnetite. 



The Michipicoten range is separated from this by a wide area of Laur- 

 entian, and the first outcrop occurs about fifteen miles west of Iron Lake, 

 near the headwaters of Dog River. It is jaspery and cherty, with inter- 

 banded magnetite and hematite ; but on the eastward extension of the line 

 across Dog River one finds the granular variety mixed with magnetite near 

 Paint Lake. A few miles to the north what appears to be a parallel band 

 has been traced by Professor Willmott and has been found to include prom- 

 ising ore deposits. The whole extent of this range, as traced by Professor 

 Willmott, is about twenty-seven miles, the longest continuous stretch in 

 Ontario. 



Farther to the east not much has been reported until Magpie River is 

 crossed by Speight's east and west base line, where a range of hills with 

 jaspery and cherty material interbanded with ore runs two or three miles 

 southeasterly. Six or eight miles to the south the iron-bearing rocks are 

 found again near Park's Lake, and can be followed four or five miles west 

 and southwest, including the promising Josephine mine now being developed. 

 In the same direction is Lake Eleanor, where siderite and the banded silica 

 are found ; and two miles west is the Boyer Lake property described before, 

 the band having a length of about a mile and a quarter and running east and 

 west. Ten miles to the southwest is the Gros Cap deposit of sandy and 



1 Pp. 200-202. 



