ami .Vji/jj/.i/ llmtVTj ,1'tnrrr t> 



GEOLOGICAL 



AND 



NATURAL HISTORY SimVEY 



OK 



MINNESOTA 



ILWIXCHELL, STATK OBOLOOIS1 

 Scale .42 miles to fln inch . 



Probable Cretaceous Areas 

 Lower Silurian Ai'eas 



^^ 



