296 



MINERALS AND GEOLOGY 



James 1 Bay, these large areas may be conveniently divided, in order 

 to facilitate their description, into several smaller areas or districts, 

 as in the following distribution : 



1. THE ARCHAEAN AREA. 



l a . The District of the Upper Lakes. 

 l b . The Eastern Archaean District. 



2. THE SOUTHERN PALEOZOIC AREA. 



2 a . The Lower Ottawa District. 

 2 b . The Lake Ontario District. 

 2 C . The Erie and Huron District. 

 2 d . The Manitoulin District. 



3. THE NORTHERN PALAEOZOIC AREA. 



FIG. 241. 

 Sketch Map of Province of Ontario, shewing geological areas. 



Explanation : The diagonally shaded space shews the great Archaean area : 

 l a indicating the District of the Upper Lakes, and l b the Eastern Archaean 

 District. 



The horizontally shaded space shows the Southern Palaeozoic area : 2 a de- 

 noting the Lower Ottawa District ; 2 b , the Lake Ontario District ; 2 C , the 

 Erie and Huron District ; and 2 d , the Manitoulin District. 



The vertically-shaded space (3) indicates the portion of the Northern Palae- 

 ozoic area lying within the Province boundary. 



S=Lake Superior ; M=Lake Michigan ; H=Lake Huron ; E=Lake Erie ; 

 and O=Lake Ontario. The unshaded district on the right is part of the 

 Province of Quebec. 



