THE LOWER HURONIAN. 359 



lenticular shape. These effects are probably due to minor folding, which 

 has taken place subsequent to the period when the schistosity was produced 

 and the granite intruded, this second period of folding having, indeed, 

 emphasized the schistosity due to the first period of folding and having 

 slightly affected the Giants Range granite. 



METAMORPHIC ACTION OF THE GIANTS RANGE GRANITE. 



The metamorphic effect of this granite on the greenstones being essen- 

 tially similar to that produced by the intrusion of the granite of Trout, 

 Burntside, and Basswood lakes will not here be discussed, the reader being 

 referred to the previous discussion for the details and results of the process. 



As a result of the intrusion of the Giants Range granite, the Lower 

 Huronian sediments have also been extensively metamorphosed. A dis- 

 cussion of this metamorphism may be found under the discussion of these 

 sediments (p. 340). 



INTERESTING LOCALITIES. 



Uelations to the Archean Ely greenstone. — The relations of the Giants 

 Range granite to the Ely greenstones are well shown in the SE. ^ of sec. 

 24, T. 62 N., R. 13 W., and in the NW. i of sec. 19, T. 62 N., R. 12 W. 



Belations to Soudan formation. — Dikes of the Giants Range granite 

 have been observed cutting the Soudan formation at several places; for 

 instance, at 200 paces west of the southeast corner of sec. 7, T. 62 N., R. 

 12 W., the iron formation is cut by injections of granite wliicli run parallel 

 to the bands of the iron formation. Dikes of the same granite cut the 

 adjacent Ely greenstone just north and west of this locality. At 1,050 

 paces north, 550 paces west of the southeast corner of sec. 28, T. 62 N., 

 R. 13 W., the iron formation is likewise cut by granite dikes. Similar 

 dikes cut the iron formation in sees. 3 and 4, T. 62 N., R. 12 W. These 

 dikes can be well observed at the places where they occur on the bare hills 

 south of Ely. In this particular instance the dikes are only a very short 

 distance away from the edge of the main mass of Giants Range granite, 

 and that they are offshoots from it can hardly be doubted. 



Metamorphism caused by granite. — Reference has already been made to 

 the fact that the Giants Range granite has had an important metamorphos- 

 ing effect on the rocks which it has inti'uded. Its effect upon the Lower 

 Huronian slates is well shown in the area south of the Kawishiwi River, in 



