ELY GREENSTONE. 171 



altliougli there are irregular diagonal fractures wider apart. It seems as if 

 there had been distributive movement about each pebble-like area, so that 

 in this way readjustment occurred largely in the softer matrix-like material 

 rather than in the regular fashion shown in the homogeneous rock to the 

 north. These facts lead to the conclusion that the southern part of 

 the ledge is decomposed, much mashed, detrital material derived from and 

 resting upon homogeneous schistose material. Here it is rather difficult to 

 di-aw the dividing line between the Ely greenstone and the conglomerate 

 derived from it. At other places, where the mashing has not been so 

 extensive and where the pebbles are far more distinctive, and especially 

 where the rock contains pebbles of jasper and granite as well as of green- 

 stone, the line of separation can be much more readily drawn. 



Indeed, a little farther southeast, along this same trail — that is, on the 

 Wind Lake-Moose Lake trail — a perfectly distinct conglomerate occurs 

 which consists predominantly of greenstone pebbles and bowlders, some as 

 large as 3 feet in diameter, but which contains many associated granite 

 pebbles. From the repetition of different zones of conglomerate occurring 

 on this portage it would seem that the rocks had been very intricately 

 folded here and that the several different zones are really a single zone 

 repeated as a result of the close folding. 



In the southeast quarter of sec. 18, T. 62 N., E. 13 W., exposures are 

 pretty nupaerous, and one finds here good opportunities for studying the 

 transition from the gi-eenstone, with ellipsoidal parting here and there, to 

 the amphibole-mica-schists. These schists occur in their best, most typical 

 development in close proximity to the Giants Range granite, which, as has 

 already been stated in detail elsewhere, is considered to be the cause of 

 their existence. In all such cases the farther one goes from the contact the 

 less altered are the greenstones found to be, whereas the nearer the contact 

 the more intricately are the greenstones cut by the granite dikes, and the 

 more nearly they assume the characters of typical schists. The same 

 observations, pointing toward the production of the schists from the green- 

 stones by the intrusion of the granite, may be mad,e at many places along 

 the boundary l^etween the granite and the greenstone, extending from 

 sec. 31 northeastward through sees. 32 and 29 into sec. 28, all in T. 62 N., 

 R. 13 W. At numerous places along this line the hornblende-schists still 

 possess the ellipsoidal and less con:iraouly the amygdaloidal characters 



