274 THE VERMILION IKON-BEARING DISTRICT. 



at which the relations between the granite and the adjacent rocks may be 

 noted with advantage, and although these have already been mentioned, 

 attention will be again called to them. 



The relations of the granite of Saganaga Lake to the Ely ellipsoidal 

 greenstone may be seen at almost any place along the contact between the 

 two on the south shore of Gull Lake. For instance, just below the north 

 section lines of sees. 22 and 23, T. 65 N., R. 5 W., numerous dikes of the 

 granite cut the greenstone. The greenstone near the contact with the 

 granite, where it is full of granite dikes, has been extremely metsmorphosed. 

 The farther we go southward from the contact the less altered is the gi*een- 

 stone and the better preserved are the ellipsoidal, amygdaloidal, and other 

 structures. The southwest shore of West Gull Lake and the small lake on 

 the portage route between West Gull and Gull lakes are easily accessible, 

 and here in the cliffs many dikes of granite cut the greenstone. The same 

 relation is very clearly shown on the northeast shore of Cache Bay, which 

 is the large bay of Saganaga Lake that extends into Canada. Along this 

 shore innumerable dikes of the granite cut these schists. 



The granite of Saganaga Lake is found in contact also with the Ogishke 

 conglomerate, and its relation to the Ogishke conglomerate is well shown at 

 certain places (mentioned above, pp. 269-273) on the west side of West Gull 

 Lake, on Saganaga Lake, and on Cache Bay of Saganaga Lake. At all of 

 these places the conglomerate consists largely of bowlders and finer detrital 

 material derived from the granite. The rocks along the contact have in 

 places been closely folded, and as a result of this folding the contact 

 between the two is somewhat irregular and the relations appeared to be 

 complicated, but careful studies of the exposures have shown the relations 

 above stated. 



