37 



At this time the lake Ontario ice lobe had become sharply- 

 differentiated, so that in the western half of the basin the ice 

 was spreading from the central axis towards the margin on 

 all sides except the east, where the ice stream was entering. 

 From this circumstance it happens that the ice at this stage 

 moved towards the northwest over Toronto and vicinity. A 

 few miles east of Toronto its movement was directly north. 

 These movements were respectively transverse and nearly 



Bond Lake, Looking East. Probably Due to Partly Buried Ice Block 

 Which Afterwards Melted Out. 



opposite to the southwestward movements over this region 

 at the time of maximum extension. The relations in this 

 area afford a fine illustration of the changing and increasing 

 influence of topography upon the movement of the ice as 

 the ice grew thinner. 



The drift, as Professor Coleman has pointed out, is 

 quite deep in the vicinity of Toronto. But it is certainly 

 much deeper along the line of the great moraines 20 miles 

 to the north ; and its depth is also considerable in the region 

 west and southwest of lake Simcoe. Much the greater part 



