MAP OF 



MINNESOTA. 



SHOWING 



THE APPROXIMATE AREAS OF 



THK GEOLOGICAL SYSTEMS 



BELOW THE DRIFT. 

 N H WINCHKU,, STATK GKOI.OGIST. 



1900 



WlH 



"-^S-^ VI -Xfcl/^22 



1 Explanation 



(flPiem. 



"CRETACEOUS. I I IMotmm 

 J ' 



LOWER SILURIAN.!""] { Galena 

 \Trenton 



tfWsdaat fieri Hatidtt/orif, interfoffr/rrtiiw 



\AfOfu /u Lavas, and 

 PotsdoiH Ounrlin 'ft'/t/f .\'fi/'l 7m \ MMdlf 

 and tJifPitrJtmtii(tr(*m(//oinrrntc}<toml>ri/in 



Cabotian (i(jnfoi/.y 



_ , ,,., i.i , J I II 



J Gabbnant(itsrfination.s an&LavaALowa 



Animikif. 



D Slates and 'Qtiarlzylc 

 ZJ 



Gnmitf Syrnytt etc 

 Cn'stallwef* 



YF'!"I nw t I R E N V 

 YELUOW Jfr -i 



COtTO NWOOD WA,TO 



. . 



