jRemeics — Geological Survey of Canada. 569 



Messrs. E. D. Ingall and Theo. Denis continued the detailed 

 geology of the typical Huronian area in the Bruce Mines district 

 of Algoma. A map illustrating the geology of this area accompanies 

 ihe I'eport, which, in addition to the geological interest attached to it, 

 is expected to be of service in the future search for copper deposits. 



Dr. A. E. Barlow has an interesting report on Corundum in 

 Ontario. The occurrences of this valuable mineral in Canada are 

 confined to a series of eruptive rocks frequently presenting a well- 

 marked foliation, in close accordance, as a general rule, with that of 

 the surrounding granites and diorites (Laurentian gneisses). The 

 corundum-bearing rocks are of syenitic or gabbroic type. "The 

 simplicity and, at the same time, completeness of the Canadian 

 occurrences of corundum, combined with the fresh and unaltered 

 character of the associated minerals, at once removed all doubt as 

 to the pyrogenetic origin of this mineral, showing clearly its 

 development as a primary constituent from a highly aluminous 

 silicate magma, as one of the first products of its crystallization." 

 It is worthy of note that Canada is now the largest producer of 

 corundum in the world. 



Dr. Barlow, associated with Dr. G. A. Young, continued work in 

 the Temagami Lake region. 



Professor W. A. Parks investigated a part of the country on the 

 western side of Lake Timiskaming and thence northward to some 

 of the branches of the Blanche Kiver in connection with the recent 

 discoveries of silver and cobalt in that district. He mapped out the 

 rock-formations of the region, and indicated the zone in which the 

 two metals occur. 



Mr. A. F. Hunter was occupied in the district from Orangeville 

 northward to Thornbury, Ontario, in tracing the interesting high- 

 level shore-lines along the flanks of the Blue Mountain escarpment 

 south of Georgian Bay (Lake Huron). 



An important task was begun by Professor Ernest Haycock in 

 working out the detailed geology of the upper Laurentian series 

 in the south-western part of the county of Ottawa. This area 

 contains a great variety of crystalline rocks, which Professor Haycock 

 divides into nine groups, consisting of gneiss, crystalline limestone, 

 quartzite, altered greenstone, etc. After further work it is intended 

 to issue a map of the district on a scale of one inch to one mile, 

 to show the geological structure and the distribution of the rocks in 

 a manner similar to that done by Sir William Logan on his map of 

 a typical area of upper Laurentian rocks in the county of Argenteuil. 



The geology of part of the county of Ottawa engaged the attention 

 of Mr. J. F. E. Johnston and proved to be of a very intricate nature. 

 The Lievre Eiver and Templeton phosphate district are included in 

 the area examined. 



Dr. Kobert Chalmers investigated the surface geology of the 

 Gaspe peninsula and of the country along the south side of the 

 lower St. Lawrence from Gaspe south-westwards towards the city 

 of Quebec. Thence he worked northward to Lake St. John and 

 the valley of the Saguenay, noting that there are a number of 



