1(51 



icejara, Ibeg leave to amentl would account satisfactorily for the 

 absence of marine fossils in the lake region. 



It would not alter the fact of the flooding of the lake region in the 

 period of the leda clays, the same as if such ice dam had not had any 

 existence. If such ice dam existed, it was towax'd the close of the flood 

 period, and oiiiy after the clays I have described had been laid down 

 along the old river valleys, and over all the lower places. 



In regard to the shoi-e lines and terraces of the huge shallow St. 

 Lawrence sea or lake which united the four Canadian lakes during the 

 pleistocene epoch, on the sides toward Hudson Bay and Winnipeg 

 Lake respectively, where ice dams also would appear to have been 

 necessary to exclude salt water. Dr. Bell and Mr. Lawson, who have 

 worked in those I'egions, Dr. Dawson who has studied the countrv 

 beyond, and others will [irobably ba able to contribute many more 

 interesting facts, the mei'e statement of which may carry their own 

 explanation with them 



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