﻿330 Canadian Record of Science. 



In the Shuswap district of the same province, Mr. McEvoy 

 completed the investigation necessary for the geological map sheet 

 of that area. This work was begun by Dr. Dawson, now Director of 

 the Survey, with the assistance of Mr. McEvoy, in the summer of 1890. 



In the North-West Territories and Keewatin, Mr. Tyrell made 

 a i-econnaisance through the country lying to the north of Lake 

 Winnipeg and between the Nelson and Saskatchewan rivers. 



In the course of this journey of about 1,100 miles, the northern limits 

 of the Palaeozoic system were determined and a hitherto unknown 

 area of Huronian rocks was defined. A large section of fertile land 

 was crossed on the western side of the Nelson River. This seems to be 

 well adapted for agricultural purposes and, with proper railway 

 communication, might offer a promising field for settlement. 



The work performed in the Lake Superior district was under 

 the direction of Mr. Mclnnes. Two chief geological systems are 

 recognized in this region, the Laurentian, and Huronian (?) The 

 latter consists of two series, known as the Coutchiching and Keewatin. 

 Through all these intrusions of granite are frequent. After an 

 examina/tion of a large number of mines and mining locations from 

 Rainy Lake to Lake of the Woods, Mr. Mclnnes says: "Here, as 

 in the Seine River country, gold has been found, in every case 

 of which we have any record, at no great distance from the contact 

 between the Keewatin and intrusive granitoid rocks, which occur 

 most frequently as narrow rims along the edge of the more extensive 

 areas of biotite-gneiss, but which also invade the Keewatin rocks 

 as isolated intrusive masses. I know of no case where gold-bearing 

 veins have been found to occur in the main body of the biotite-gneiss 

 areas which we have classed as Laurentian." 



Dr. Adams and Mr. Barlow were associated in an examination 

 of the part of Central Ontario known as the Haliburton Sheet of 

 the Geological Survey's series of maps. The geological divisions here 

 distinguished are the Lower Laui-entian (Fundamental Gneiss), the 

 Grenville Series and the Hastings, The investigation of the relations 

 of these to one another promises very interesting results. On the 

 north side of the Ottawa River, Dr. Adams has previously shown 

 (" Report on the Geology of a Portion of the Laurentian Area Lying to 

 the North of the Island of Montreal," Geol. Survey of Canada, 

 Vol. VIII. (N.S.) ) that the Grenville Series is, in part, a very old 

 altered sediment. In this district this conclusion is corroborated and 

 an intrusive contact between the Grenville Series and the Funda- 

 mental Gneiss shown to be probable. The relations existing between 

 the Grenville and the Hastings Series have also received special 

 attention, and, from the examinations thus far made, it seems 

 probable tluit the Grenville will be ultimately found to represent the 

 more highly metamorphosed portions of the Hastings Series, and 

 these, it is suggested, may be of Huronion age. 



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