RIVER ICE 



123 



Fig. 126. Shove of shore ice where the shore was marshy. The ice of the 

 froz'-n marsh is pushed up into ridges. (Buckley, Wis. Geol. Surv.) 



Montreal stone buildings 30 to 50 feet square, projecting so as to 

 have river ice form about them, have been moved by the ice of the 

 St. Lawrence. 



When the river ice breaks up, masses of it are carried down- 



Fig. 127. The shove of ice on the shore of Lake Mendota. \\ H. (Photo, by 

 Juckley.) 



