314 THE VERMILION IRON-BEARING DISTRICT. 



channel between Birch Lake and Sucker Lake. Here the cong-lomerate 

 consists ahnost exchisively of fragments of the greenstone which hes on the 

 iiuj'tU si4e of the channel. An occasional fragment of vein quartz is present. 

 ^I^iiis rock has been so extremely mashed that the pebbles have been rolled 

 put and flattened, and it is now fairly difficult to recognize its true character. 

 Its fragmental character is best shown on the portions of the exposure 

 where one gets sections transverse to the directioij of greatest flattening in 

 the pebbles. The difficulty here is increased by the fact that, as stated 

 above, the conglomerate consists almost exclusively of the greenstone, the 

 matrix, of course, being derived from the same source and consisting of 

 the same material. 



A mashed conglomerate similar to this in every respect was seen at a 

 number of places on the A^ery irregular stream that connects Cache Bay of 

 Saganaga Lake with Saganagons Lake in Canada. The best place at which 

 to see this conglomerate is on the south shore of the stream where it turns 

 northeastward and flows into the southwest bay of Saganagons Lake. In 

 this vicinity the greenstone and the overlying sediments have been very 

 closely infolded, and as a result of the folding excessive shearing has taken 

 place along the limbs of the folds. Here, again, if the conglomerate is 

 viewed transversely to the bedding, its nature can be readily recognized. 

 On some of the clifi^s, however, which run parallel with the bedding of the 

 conglomerate, and essentially with that of the schistosity, the conglomeratic 

 nature is not so readily recognized. The pebbles occasionally stand out as 

 more or less rounded patches on the cliff face, but very commonly blend 

 with the matrix so nicely that the rock appears almost homogeneous. 



Naturally where the conglomerate is made up of a great variety of 

 pebbles, its true character may be recognized with greater ease than in the 

 above-mentioned instances. Usually where the conglomerate has been 

 folded, the pebbles have not been mucla affected. The conglomerate may 

 in general have a schistose character, and this schistosity usually agrees, 

 approximately, with the long direction of the pebbles. Closely examined, 

 it will be found that the pebbles themselves are in most instances not even 

 fractured, but preserve their original shape perfectly. Pebbles of granite 

 have been obtained from this conglomerate which were as symmetrical in 

 shape and apparently, to the naked eye, as fresh in character as pebbles 

 obtained from a modern shingle beach of Lake Superior. The pressure 



