62 



NEW YORK STATE MUSEUM 



From Sacandaga lake to Northampton, the direction of the main 

 river is quite normal for this part of the Adirondacks. but at 



PRECAMBRIC 

 ROCK 



PALEOZOIC 

 ROCK 



M ILES 



Fig. 4 Sketch map showing the remarkable course of the Sacandaga 

 river and the relation of the drainage lines to the Precambric and Paleozoic 

 rocks. The Preglacial Sacandaga flowed southward from near Northampton 

 into the Mohawk river. 



Xorthampton the sharp turn northeastward is decidedly abnormal. 

 Before the Ice age the river continued southward through the 

 Paleozoic rock valley and into the [Mohawk river,^ but due to heavy 

 accumulations of morainic materials across the mouth of the valley 

 the river has been forced to seek a lower channel across what was 

 a Preglacial divide between Day and Luzerne. The remarkable 



1 See figure lo of X. Y. State Mus. Bui. 153 and also the writer's paper 

 on " The Preglacial Course of the Upper Hudson River " in Geol. Soc. 

 Amer. Bui., vol. 22, 191 1, p. 184. 



