102 THE ICE AGE IN CANADA. 



few, both on account of the conditions of deposit and the 

 solvent action of carbon dioxide in the cold bottom 

 waters of the ocean. The only point wanting to com- 

 plete the analogy would be that embaying and detention 

 of drift-ice shown on our Pleistocene map, and by which 

 the old glacial age was aggravated both in Europe and 

 North America. To produce this would require some 

 differential elevation of the bed of the Pacific toward the 

 northern margin of the present area of ice-drift. 



