356 



HALL AND SARDKSON — EOLIAN DEPOSITS OF MINNESOTA 



The GroAV dunes mentioned ))y U])ham^ are in all prohaVjility simply 

 occurrences in the same ridge or series of ridges skirting the Mississippi 

 valley along its northeast side — that is, where the prevailing west and 

 southwest winds would deposit their load of sand and dust picked up 

 from the river and its numerous sand liats. The mounds of sand which 

 can be followed still farther northwestward than the district around 

 Princeton are believed to belong to the same belt and oAve their origin 

 to the same causes. They extend as far north as Brainerd, 60 miles 

 farther from Minneapolis than is Princeton. 



SAINT ANTHONY HILL AND THE UNIVERSITY CAMPUS 



The old Saint Anthony hill, once a landmark standing over Saint An- 

 thony falls, now nearly leveled in the grading of the city, consists of a 

 sand dune 10 to 12 feet high built upon a mound of glacial debris. The 



1 





FiGUEE 1. — Section of Glacial and post- Glacial Deposits. 



The locality is the railroad cut south of the University campus. Number 1 is regarded as dune 

 sand bearing soil 5 feet in thickness ; 2, gravel with lag gravel in the top ; 3, 4, and 5, various 

 phases of the Glacial drift. After N. H. Winchell. 



height of its summit above the Mississippi river at the crest of the falls 

 must have been at least 50 feet. During the past year excavations have 

 been made which have exhibited in striking profiles sections of this 

 great thickness of dune sand. 



* Warren Upham : Modified drift in Saint Paul, Minnesota. 

 19C. 



Bull. Geol. See. Am., vol. 8, pp. 183- 



