U. 5. GEOLOGICAL SURVEY. 



KEWEENAW SERIES 



JSSJjj^ Exposures of eruptives 

 ^USSS- S. Sandstone. 

 South limit. 



Upper Slate Member 



== ^SMflC SI Black slate exposures 

 ^= )1S6SK G"^ Gray wacKe exposures 



Iron-t 



Exposur 

 Limrfs c 



= Exposures showing strike and dip. 



■ Exposures showing no structure 



Scale of Map I inch = l mile 



DETAILED GEOLOGY OF THI 



