GLACIAL IVSIZOSHINS (OL? \SOWIMEMARS IMOKIN, VAIL JEU BIOIIAL, 5A 
The migration of the great center of glaciation from the north- 
ern Cordillera to the Laurentian Plateau must have been inti- 
mately connected with the very notable changes in relative 
levels which have already been alluded to. 
GEORGE M. Dawson. 
June 10, 1895. 
