PI.ATK fib. 



o 



H.IYE 



R.VE. 



R.VIK. 



K V, 



GEOLOGICAL AND NATURAL HISTORY 

 SURVEY OF MINNESOTA. 



COOK COUNTY PLATE 



COMPILED BY U.S. GRANT. 



Explanation 



Kmveenmvrtn 



Polsdum 

 ind Manifon i Ul!l Catytomtrwifa attd basic tyfteoufl rock* 



limit, 



FUty foot coitlottr* 



//itftdrcd foot contours 



Contour LitUi?* <n' 



B Surface basic rocks, Heaver Bay diabase, etc. 

 Cabotian <$ 3 Red rock /< 



\m **, ' 



I UJ 11 fitrfVH'<it*tft' *////*-' ii"'/"/MV 



Animikie | ^^ H/wit */<!/* wtnter 



I 7aron\l( or- irrtn -bearing member 

 Upper Kcewalin 

 Uncla-wi/led Keewattn 

 Grwufones 



(i/w>tti 

 ' '^O feel above thesea. 



