206 



THE VERMILION IRON-BEARING DISTRICT. 



greenstone. Five distinct bands of iron-formation material were observed, 

 each only a few paces in width, and in the belts farthest south the 

 exposures were sufficiently good to show very well the intimate relations 

 of the greenstone aiid the iron formation. The iron formation is very 



Fig. 4.— Illiistratimi shmviiif,' distribution and relations of Ely greenstone, Soudan formation, iiii^l (j^islilco eonglom- 

 erate at a place south of Moose Lake. 



clearly infolded in the greenstone, and subsequent truncation of these two 

 formations has resulted in producing very intricate surface relationships. 

 At one place a broad dike of dolerite has cut across both the preexisting 

 formations, and, indeed, it was traced for about half a mile across the 

 country. Fig. 3 illustrates the relations olDserved at this place. About 



