U. S. GEOLOGICAL SURVEY. 



KEWEENAW SERIES. 



.JiOJK Exposures of eruptjves. 

 South limit. 



Upper Slate Member 



- North limit 

 South limit. 



Iron-bearintf Member 



: ^SWk Exposures of ferruginous schist. 

 Limits of surface distribution 



PENOKE 



Quartz-S 



SI. Exposun 

 Q Exposure 

 South lim 



= Exposures showing strike and dip m^ Exposures showing no structure 



Scale of Map I inch=l mile. 



DETAILED GEOLOGY OF THE P 



