ARCHEAN GRANITES. 263 



of the portage one observes dikes of this granite in the eUipsoidal green- 

 stone, which has been metamorphosed to an amphibohtic schist on the steep 

 north-facing slopes in the southwest quarter of section 23. Similar exposures 

 occur again on the point in the southwest quarter of section 22 and in the 

 southeast quarter of section 21. The intrusive character of the granite and 

 the intricacy of this intrusion is best shown on the almost continuous expo- 

 sures that border the northwest shore of the lake in sees. 30 and 20, T. 63 N., 

 R. 13 W. One starting at almost any place on the southern shore of Burntside 

 Lake, where the granite dikes are numerous, will find that they diminish in 

 number southward, and with this diminution in number at a distance from 

 the main granite mass one will find that the schists gradually lose their 

 schistosity and grade into the normal greenstones. 



Two hundred paces north of the shore of Long Lake, on a line 1,000 

 paces west of the east line of sec. 21, T. 63 N., R. 12 W., there is a well- 

 marked eruptive breccia, produced by the intrusion of granite of Burntside 

 Lake, which includes a vast number of fragments of the greenstone forming 

 the main country rock. A similar breccia is found about 70 paces farther 

 north of the above location. A dike of the granite developed as granite- 

 porphyry cuts the greenstone at 1,000 paces north, 1,000 paces west from 

 the southeast corner of sec. 19, T. 64 N., R. 10 W. 



The relationship between the granite of Basswood Lake and the Ely 

 greenstone is well shown on a high hill at about 500 paces north of the 

 southeast corner of sec. 17, T. 64 N., R. 9 W., and on the hill in the 

 southeast quarter of sec. 16, T. 64 N., R. 9 W. At both of these places the 

 greenstone is penetrated by numerous dikes, and it has been metamor- 

 phosed in most cases to amphibolitic and occasionally micaceous rock, in 

 which schistosity is very frequently more or less well developed. 



GRA]SriTB BETWEEN MOOSE LAKE AKD KAWISHIWI RIVER, IN^ SEC. 5, 



T. 63 K., R. 9 W. 



DISTRIBUTION AND EXPOSURES. 



Distribution . — In the SE. J of sec. 5, T. 63 N., R. 9 W., there is an 

 oval mass of granite, having diameters of about one-half mile northeast- 

 southwest by one-fourth mile east-west. In the vicinity of this mass and 

 in the greenstone area for several miles to the west — in general we may 

 say in the territory between Moose Lake and Kawishiwi River — there are 



