PLATK 73 



GEOIXXilGAL AND NATURAI. Hl. 

 HUliVEY OK MINNESOTA. 



HIBBIXG PLATE 



BY N.H WINCHELL. 



Kx|>l(ination 



II MaUfifd dnft 

 ~] Glacial drt/1 '/!// 

 %j%% Black a/a, 



Taoomo ! i^ Taconyle \ Anmiltie 

 1 Qiu&yle 



Arohean 



~ Hailroae&s 



"v Fifty foot contours 

 ^*~, Hundred fool contours 



Mica 

 Greenstone,* 



tr* .thowri appivximalfly 

 Av'i </) .T()R>elabwe thfsea. 



rr- 



