146 A. p. COLEMAN MARINE AND FRESHWATER BEACHES 



level, for the region may have risen most of the 1,400 feet since that 

 time. In fact, the liighest beaches may have been made at a time of 

 great depression, and hence very little above the sea, while the lower 

 and later ones may have had nearly the same position, owing to the ad- 

 vance in elevation as the ice-sheet thinned and retreated. 



The later and lower deposits, which are clearl}'^ marine, were formed 

 after the ice had been completely removed from the province of Ontario, 

 and the climate of Ottawa had become practically the same as at present. 

 These deposits are therefore in no sense interglacial. 



