326 



EARTH FEATURES AND THEIR MEANING 



Manitoba and Keewatin, the waters of the Red were swollen by 

 melting from the retiring glacier and spread over a vast area before 

 finding a southern outlet along the course of the present Lake 

 Traverse and the valley of the Minnesota River. Along this route 



FIG. 354. Map of the southern end of the Lake Agassiz basin, showing the position 

 of some of the beaches and the outlet through the former Warren River (after 

 Upham). 



there flowed a mighty flood which carved out a broad valley many 

 times too large for the Minnesota, its present occupant, and this 

 giant prehistoric river has been called the Warren River (Fig. 354). 



