328 



LIFE OF THE PLEISTOCENE 



post-Illinoian or Sangamon interval. The Toronto beds exhibit the following 

 section (figure 5): 



Boulder clay number 4 48 feet 



Stratified sand overlying stratified clay 36 " 



Boulder clay number 3 32 " 



Silty sand, upper layers crumpled 25 " 



Boulder clay number 2 9 " 



Cross-bedded sand 29 " 



Boulder clay number 1 24 " 



Fossiliferoussand| Scarborobeds j 59 " 



Peaty clay \ I 92 " 



Below Lake Ontario (Don beds) ...•• 35 " 



Boulder clay (Illinoian till) x " 



Hudson River shales x " 



Height of section 389 " 



After the Illinoian invasion, the ice must have receded in much the same 

 manner as during the Wisconsin waning, forming lakes comparable to glacial 



Dutch CHURCH 

 R wtn 



Le^h- of L Onta BIO 



Figure 5. Section of strata at Scarboro Heights, near Toronto, Ontario. 



I I. Boulder clay number 4 48 feet, 354 feet above the lake 



H II. Stratified sand overlying stratified clay. 36 feet, 306 " " " 



G III. Boulder clay Number 3 32 feet, 270 " 



F IV. Silty sand the upper layers crumpled 25 feet, 238 " " " 



V. Boulder clay number 2 9 feet, 213 " 



Cross-bedded sand 29 feet, 204 " " " 



Boulder clay number 1 24 feet, 175 " " " 



Fossiliferous sand 59 feet, 151 " " " 



Peaty clay 92 feet, 92 " 



Level of Lake Ontario x x 



The Iroquois terrace and the bed of the old Dutch Church River are also shown (After 

 Coleman, Bull. Geol. Soc. Amer., X, figure 4). 



lakes Whittlesey, Warren, Iroquois, and possibly including other series of 

 lakes in the west, like Algonquin and Nipissing. The level of this interglacial 



