[Amr] SYNOPSIS OF THE GEOLOGY OF CANADA 198 
The relation which exists between the Huronian of the typical area 
and the Hastings series of Ontario, the Keewatin series, Coutchiching 
series of the Lake of the Woods and Algoma generally, and the Grenville 
series of the Ottawa district, is a subject full of intricate problems in 
petrography and field geology combined, of the highest interest 
No separate geological names of formations have been assigned to 
the three sub-divisions of the Huronian, as developed in the Lake 
Temiscaming region, but there is no doubt that forthcoming researches 
on the part of students in Archean geology in Canada will result in the 
probable definition and correlation of the different members of both the 
Laurentian and Huronian systems in a manner which will enable us to 
classify the various phases of these two systems and their taxonomic 
equivalents in different regions, as regular formations not very dis- 
similar from the methods or principles used in the scale adopted in the 
nomenclature of subsequent systems. The most conspicuous periods of 
volcanic activity together with periods of quiescence as indicated by the 
strata would form important factors in the determination and separation 
of the different formations. 
In the Rainy river district, in Algoma and Lake of the Woods 
regions, as elsewhere, Huronian rocks are extensively developed and 
prove to be an important metalliferous series, carrying gold, silver, 
nickel, copper, iron, and other useful minerals. 
Along the west coast of Hudson bay and in the interior, as well as 
on Marble Island, rocks of Huronian age, consisting of chloritic, and 
micaceous schists, also of fine-grained quartzite associated with diabase 
and gabbro, are classified as Huronian. Mr. J. B. Tyrrell describes a 
large belt of Huronian rocks, 120 miles in length, along the west coast 
of Hudson bay from near Baker’s foreland to a point 45 miles north of 
Cape Esquimaux. From the shore of Hudson bay inland, these rocks 
were traced for seventy miles up Ferguson river. On the Telzoa and 
Kazan rivers two additional areas of Huronian rocks are described, 
besides others in the basins of Doobaunt, Wharton, Kasba and Ennadai 
lakes. 
In the district of Keewatin, and Lake Winnipeg region, Dr. Bell 
and Messrs. Tyrrell and Dowling have recognized many areas of Huronian 
quartzites, chloritic, steatitic, felspathic, and diorite schists, besides 
conglomerates and breccias. 
Along Athabasca lake, and Churchill rivers Tyrrell recognized 
Huronian rocks, consisting of white quartzites besides fine red calcareous 
sandstones and schists. 
The Cordilleran Region.—In British Columbia and Yukon territory, 
the Huronian system has been recognized as consisting, for the most part, 
