THE LOWER HURONIAN. 373 



INTERESTING LOCALITIES. 



No attempt will be made here to enumerate all the places where these 

 dikes occur. A number of them have been shown in exaggerated size on 

 the accompanying maps. On the west end of Stuntz Island there is a 

 plexus of these basic dikes cutting the Ogishke conglomerate. These dikes 

 run parallel to one another, diverge from one another in places, and at other 

 points cut one another. At one place on the top of the conglomerate ridge 

 just south of the small northwestward-pointing bay, nine dikes essentially 

 parallel and varying in width from IJ inches up to 6 feet were counted 

 within a distance of 60 feet. These dikes cut right across the fragments in 

 the conglomerate, giving sharp contacts. The jasper fragments in the con- 

 glomerate which have been cut by the dikes seem to have been apparently 

 unaltered by them. The dikes themselves are moderately schistose, espe- 

 cially on the edges. The rock of these dikes is extremely altered and 

 appears to have been a dolerite. 



Similar dikes can be seen cutting across the granite island just east of 

 Stuntz Island, and still others were seen on the high hill along the shore 

 near the northeast corner of sec. 22, T. 62 N., R. 15 W. 



A number of lamprophyric rocks were observed cutting the Ely green- 

 stone, the Ogishke conglomerate, and Knife Lake slates near the center of 

 sec. 17, T. 63 N., R. 9 W. Similar dikes occur on the hill on which Ely 

 is built, northeast of the Methodist church, and also on the greenstone 

 hills on the north side of Long Lake. 



