THE IOWAN ICE INVASION 357 



10. CANADA 



It has been suggested that the Iowan drift may be represented in Ontario, 

 especially at Toronto (see section, page 328). Near Niagara Falls a boring in 

 the Whirlpool-St. David's channel passed thru strata which might be referable 

 to the Iowan stage (see section, page 323) An old soil underlies 30 feet of sand 

 and gravel in Hamilton (Hunter Street), at the west end of Lake Ontario. 

 This old soil is 2 feet thick 42 and appears in the section as noted below: 



Sand and gravel, some cross-bedded r 30 feet 



Brown clay, unstratified (old soil) Peorian? 2 " 



Blue till, the upper portion weathered Iowan? 3 " 



Bones of elephant and pieces of wood Sangamon? x " 



From this layer were collected : 



Larix amerkana 



Picea cf. nigra 



Mammal bone (reported by workman) 



The bones of the elephant and the pieces of wood noted at the base of the 

 cutting seem to indicate the presence of the Sangamon interglacial interval. 

 About a mile to the west of the Hunter Street section, in gravel pits, the follow- 

 ing section was observed. 



Wisconsin. Clay, making red bricks 6 feet 



Gravel 30 " 



Peorian? White sand 5 " 



Iowan? Hardpan 4 " 



Sangamon? White sand with mammoth tusks and bones 33 " 



Covered to level of bay x " 



Height of section 78 feet 



Two interglacial intervals are apparently indicated here, the lower is clearly 

 Sangamon while the higher may be Peorian, or it may be a portion of the Wis- 

 consin series. In view of the present attitude of several prominent geologists 

 toward the Iowan there seems need for much additional information before 

 these beds are positively referred to the Peorian interval. 



V. Systematic Catalog of the Biota or the Peorian 

 Interglacial Interval 



PLANTS 

 None recorded specifically. 



a Coleman, Trans. Can. Inst., VI, p. 36; Spencer, Can. Nat., N. S., VII, p. 470; op. cit., 

 X, p. 308. 



