THE BATE UF THE GLACIAL PtRWD. 



555 



pied by Lakes Calhoun and Harriet, and joins the Minnesota 

 at some point above Fort Snelling, the precise locality being 



TALLS IN 1B30 

 FALLS Or 1680 



Fis. 142.— Map of Mississippi River from Fort Snelline to Minneapolis and the vicinity, 

 showing the extent of the recession of the Falls of St. Anthony since the great Ice 

 age. Notice the greater hreadth of the valley of the Minnesota Eiver as described in 

 the text. 



hid by a subsequent deposit of drift. Tt was cat down into 

 the St. Peter sandstone over one hundred feet at least, as 

 shown by the well at the Sumner school-house, and about two 



