62 



to the uniformly micaceous gneisses and schists of the 

 Coutchiching, is present at these points. The transition 

 marks a decided change in the conditions of rock formation. 



Coutchiching mica schists dipping beneath Keewatin greenstone, 

 Rainy lake, Ontario. 



The irruptive nature of the Algoman-Coutchiching con- 

 tact may be observed at several points to be visited. In 

 proximity to the contact, inclusions of previously schistose 

 Coutchiching are surrounded by the biotite granite, while 

 apophyses of the granite invade areas of Coutchiching. 

 In such localities, certain beds of the Coutchiching are 

 abundantly supplied with secondary aluminous silicates. 



It is interesting to note that the figures which represent 

 the dips of the bedding planes away from the granite 



