THE GEOLOGICAL AND NATURAL HISTORY" SURVEY OF MINNESOTA. 

 N. H. WINCHELL. STATK GEOLOGIST. 



1872-1882. 



THE 



GEOLOGY OF MINNESOTA. 



VOL I, OF THE FINAL REPORT. 



BY N. H. WINCH ELL, 

 ASSISTED BY WARREN UPHAM. 



SUBMITTED MARCH 10, 1882, AND PUBLISHED UNDEK THE DIRECTION 



OF THE HON. FRED VON BAUMBACH, 



SECRETARY OF STATE. 



ILLUSTRATED BY FORTY-THREE PLATES, 



AND FIFTY-TWO FIGURES. 



MINNEAPOLIS. MINN. 



JOHNSON, SMITH & HARBISON, STATE PRINTERS. 

 1881. 



