BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 21, PP. 433-440 August io, 191o 



keLationship of niagaea eiver to the glacial 



PEEIOD^ 



BY J. W. SPENCER 



{Read before the Society December 29, 1909) 



CONTENTS 



Page 



Preface 433 



Studies of the Whirlpool-Saint Davids Valley 433 



Features of the Whirlpool-Saint Davids Gorge 434 



Pleistocene deposits of Whirlpool-Saint Davids Gorge 435 



Section of drift in the Whirlpool-Saint Davids Canyon 436 



Neighboring drift deposits 437 



Forest Glen and older epochs 437 



Correlation of the Whirlpool drift with that of Scarboro Heights 438 



Summary 439 



Preface 



In my investigations leading to "The Evolution of the Falls of Niagara" 

 the most important problems were those bearing on the changing physics 

 of the great cataract. To a relatively small extent the valleys buried 

 beneath the drift produced effects, but that which was written on the 

 features of the drift was only preliminary and should not be considered 

 as a complete investigation of the subject, as lack of time did not permit 

 of a full treatment. The river was regarded in a general way as post- 

 glacial for that region only. With those notes now amplified by more 

 complete details and the features still impressed on my mind, a better 

 description can be given of the changing Pleistocene formations in this 

 locality than that previously published. 



Studies of the Whirlpool-Saint Davids Valley 



The peculiarities of the Whirlpool were first described by Lyell in 

 1841. He thought the Niagara Eiver formerly passed by this now buried 



1 Manuscript received by the Secretary of the Geological Society January 15, 1910. 



(4c3) 



