SOUDAN FORMATION. 



205 



A number of exjalorations farther east along- the same belt of rock have 

 likewise disclosed the presence of the iron formation, but thus far only 

 very small quantities of ore have been found. 



Fig. 3.— Sketch showing Soudan formation infolded in Ely greenstone, both cut by Keweenawan dolerite dike. 



South of Moose Lake small stringers of jasper have been observed at a 

 immber of places, associated with the Ely greenstones, which are there well 

 exposed on the bare hills. On the narrow strip of land in the NW. ^ of 

 sec. 4, T. 63 N., R. 9 W., sejjarating two small lakes, there are exposed 

 several narrow belts of iron formation intimately associated with the 



