[Amr] SYNOPSIS OF THE GEOLOGY OF CANADA 191 
and norites, all of which have been subjected to crushing and foliating 
agencies. 
The Cordilleran Region.—In the Cordilleran region of British Co- 
lumbia the Selkirk range of mountains belongs in part to the Laurentian 
system, and forms the axis upon which were deposited, both east and west, 
the succeeding and newer sedimentary geological formations. Granite 
gneisses carrying both muscovite and biotite, also hornblende gneisses 
and graphitic gneisses have been described by Dr. G. M. Dawson from 
the Yale district of British Columbia, whilst in the remote northerly 
portion of the Yukon territory, biotite-granite-gneiss, assigned to the 
Laurentian system have been recorded by Mr. R. G. McConnell. 
In the extreme north of British North America a considerable 
portion of the islands in the Arctic Archipelago belongs to the Lauren- 
tian system. Granitoid gneisses, limestones and other crystalline rocks 
occur which resemble those met with in southern Canada. 
THE HURONIAN SYSTEM. 
The Acadian Region.—To this system have been referred the diorites, 
diabases, felsites and ashrock of the “Coldbrook Group” of New Bruns- 
wick, besides epidotic and chloritic and mica-schists and slates from 
King’s, Albert, St. John, and Charlotte counties of the same province. 
The “ Kingston series” as exemplified by the gneissoid rocks of 
Northumberland county, the felsite, talco-chloritie and other schists of 
Bostwick brook in King’s county have also been referred by Dr. R. W. 
Ells and Prof. L. W. Bailey to the Huronian system, No rocks of this 
horizon have as yet been recorded from Nova Scotia. It is not improb- 
able, however, that some of the crystalline limestones, dolomites, felsites, 
and more or less altered rocks classed as Pre-Cambrian may belong to 
the Huronian system. The “Momable slates” of Newfoundland by some 
called Huronian may belong to the Cambrian system. 
The Laurentian Highlands—In the peninsula of Labrador, Mr. 
Low has recognized two large areas of Huronian rocks; the first along 
the East Main river for a distance of 160 miles; the second, an area 
south-west of Lake Mistassini. Along the East Main river the Huronian 
consists of mica-schist, conglomerate, felspathic and quartzose schists, 
chloritic schist, hydro-mica slate, agglomerates and felspathic sand- 
stones. On Belle Isle, Dr. Selwyn records the occurrence of felspathic 
sandstones, shales, tufaceous sandstones, and diorite schists; whilst on 
the west side of Cape Wolstenholm, and Skynner’s cove, Nachvak, 
Labrador, Dr. Bell obtained in 1885 green chloritic schists and a compact 
steatite or pipestone ascribed to this system. 
