RELATION OF LAND UPLIFT TO ICE BODY 251 



its own deposits, was diverted northward toward Ballston and Saratoga. 

 The flow in this direction continued for another long episode, sufficient 

 to build the broad sand plains west and south of Saratoga Lake and about 

 Schuylerville. Eventually the differential uplift lifted the Saratoga dis- 

 trict faster than the Schenectady district, and the river was thrown back 

 into its present eastward course toward Cahoes. 



In the Ontario basin we find interesting and convincing data. The 

 facts shown in the tabulation, plate 11, and already briefly discussed (page 

 244), clearly indicate that the rise of areas north of the Iroquois fulcral 

 line took place under Iroquois waters and not under the ice-sheet, because 

 in the "splitting of beaches" the vertical spacing of the abandoned bars 

 in Canada and in New York north of Watertown gives a vertical range 

 of lowering water level equal to the whole Glacial uplift before Iroquois 

 extinction ; and the amount of glacial uplifting steadily decreases north- 

 ward instead of increasing, while the latter would have been the case if 

 the land uptilting had been in progress during the recession of the ice- 

 front. This matter is important as a check on our theory. The figures 

 for the spacing of Iroquois bars north of the Rome isobase, the fulcral 

 line, are entirely independent of all the derived figures in the tabulated 

 data. The amount of beach splitting is field measurement alread}*' on 

 record in publications. It is the height of the summit bar above the 

 latest and lowest water plane, which is the one used in the analytic tabu- 

 lation. The close coincidence between the amount of beach splitting and 

 the Glacial uplift in Canada is very significant. Following is the com- 

 parison : 

 New York points: Glacial uplift, ^^.f^ 



Rome 180 



Richland 121 22 



Lacona 115 38 



Adams 102 42 



Brookside 85 51 



Watertown 69 62 



Russell ? 35 



Canton 25 ? 



Potsdam 10 ? 



Malone 5 ? 



Chateaugay 



Covey 



Canada points : 



Quays 83 



Trenton 53 55 



Oak Hill 39 36 



Havelock 33 ? 



Madoc 24 25 



West Huntingdon 2 6 



