U.S. GEO LOGICAL SURVEY 



GEOLOGICAL MAP OF Tfl 



TOPOGRSB 



BY? 



SCALE 2 ns^'CHES -1 MIL 

 HORIZONTAL SCALE OF SECTIONS 2 INCH.' 



ELEVATION OM 



ARCHEAN 



/Rgr 



Als 



ALOl 



LOWER HURONIAN 



SturgeonQuartzile Randville Dolomite Mansfield Schist Grovel 



Air 



Aim 



H 



