December 28, 1914 
Canada 
Geological Survey 
Museum Bulletin No. 8. 
GEOLOGICAL SERIES, No. 22 . 
The Huronian Formations of Timiskaming RegioUt Canada. 
By W. H. Collins. 
INTRODUCTION. 
In a paper^ presented last year before that section of the 
International Geological Congress which dealt with the classifi- 
cation of Pre-Cambrian formations, attention was directed to 
the fact that only a fringe along the south of the Canadian shield, 
or great Pre-Cambrian province of North America, is well 
enough known to have an important bearing upon any general 
classification of the rock formations in that province. It was 
also pointed out that, so far as any such classification is concerned, 
this southern fringe is divided into three subprovinces by wide 
intervals either of unknown country or of granite and other 
formations that are of little utility for purposes of geological 
correlation. To visualize this idea more effectually the index 
map used to depict these regions is reproduced in Figure 1 of 
this paper. Before formations in adjacent regions can be re- 
liably compared, it was held, the geological sequence in each 
should be fairly completely established by studying and com- 
paring typical, or key districts. Local names were advocated 
^ Collins, W. H., A classification of the Pre-Cambrian formations in 
the region east of Lake Superior, Compte Rendu, XI le Congr&s G^ologique 
International. 
