54 B GEOLOGICAL SURVEY OF CANADA. 



which has a general course of N. 34° W. The dyke traverses the lime- 

 stone of the region, which is here nearly flat, and also an asscoiated and 

 probably contemporaneous dioritic mass. It is probably to intersect 

 this dyke that the shaft has been sunk, but there is now no appearance 

 on the surface which would justify extensive exploration. This is the 

 opening named ' main shaft ' on the sketch of the inlet by Poole. 



Huston inlet. Limestone appears at the points on both sides of Huston Inlet. It is 

 also found on the sonth-west side of the inlet at several points, in asso- 

 ciation with massive contemporaneous green volcanic rocks, of which 

 one — at the point at the knee of the inlet — is a well characterized 

 amygdaloid. It is not improbable that the anticlinal axis, already 

 mentioned as running east and west south of the Bolkus Islands, turns, 

 abruptly at the west end of the inlet to a southerly course, running 

 into George Bay, and thence west of, but nearly parallel to, Huston 

 Inlet. Huston Inlet would then mark the run of one band of the 

 limestone and of the flaggy, calcareous argillites already more than 



Probable iCreta- once referred to. At Boulder Island, near the entrance to the inlet, 



ceous outlier?. ' 



several hundred feet in thickness of blackish argillites, with calcareous 

 concretions and sandstones, and thin limestones, occur, and may repre- 

 sent this band, though it is perhaps more probable that they belong to 

 a small outlier of the overlying Cretaceous coal-bearing series, which 

 appears in the form of sandstone and conglomerate beds at low angles 

 on the south-western point of the Bolkus Islands. 

 Iron ore. At the east side of the entrance to Harriet Harbour Mr. Poole has 



marked a deposit of magnetite on his sketch. This occurs on the beach 

 in the form of an irregular mass, which measures on the surface sixty- 

 seven feet across. It is contained in a body of fine grained greenish 

 trappean rock, which is intrusive in the limestones and associated 

 beds. In some places large blocks of nearly pure magnetite may 

 be obtained, while in others it is much mixed with quartz, and 

 contains also a considerable proportion of iron pyrites in irregu- 

 lar bunches and strings. This in decomposing gives the whole 

 mass a reddish colour, and from its intimate association with 

 the magnetite might to some extent injure the quality of the 

 ore. On laying down the course of the dyke at Mr. Poole's ' inain 

 shaft,' on the north side of Skin cuttle Inlet, it is found to very nearly 

 strike that associated with this deposit, which also appears to have a 

 north-west and south-east course. It is therefore highly probable that 

 both represent portions of the same intrusion. That the iron ore runs, 

 southward beyond the locality where it was seen in place in Harriet 

 Harbour is shown by the fact that loose masses of it are found on the 

 south end of Harriet Island. These must have been carried thither from 

 some place higher up the valley, in common with other boulders, 

 during the glacial period. 



