BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 7, pp. 423-452, PLS. 19-21 APRIL 14, 1896 



GLACIAL GENESEE LAKES 



BY H. L. FAIRCHILD 



{Read before the Society August ^7, 1895) 

 CONTENTS 



Page 



Introduction 424 



The present Genesee valley 425 



Hydrography and topography 425 



Drift deposits 426 



The ancient Genesee valley , 427 



Postglacial channels of the Genesee 427 



Postglacial channels of tributary streams , 428 



Buried channels of the Genesee 429 



Sequence of events in the geological history of Genesee valley 429 



Introductory statement 429 



Era of preglacial subaerial erosion 429 



Episode of lakes by ice-advance 430 



Episode of glaciation 430 



Episode of lakes by ice-retreat 430 



Episode of morainal lakes 430 



Era of postglacial subaerial erosion 430 



Phenomena of the glacial lakes 431 



Evidence of water-planes 431 



Drainage outlets 432 



Theoretical statement 432 



Description of the glacial lakes , 433 



First stage : Three primary lakes 433 



Outlets 433 



Life history 433 



Second stage : Pennsylvania lake 434 



Outlet 434 



Life history 434 



Third stage : Wellsville lake 434 



Outlet 434 



Water-levels 435 



Fourth stage : Belfast-Fillmore lake 436 



Outlet 436 



Water-levels 437 



L— Bull. Geol, Soc. Am., Vol. 7, 1895. (423) 



