84 B 



GEOLOGICAL SURVEY OP CANADA. 



and sandstones, which, with the exception of a considerable thickness 

 of shaly beds north of Lucy Island, continue to the south-east point. 

 South side of On the south side of Parry Passage, the Cretaceous rocks are found 



Parr j' Passage, J & ' 



and Lepas Bay. overlying a rock like that of Lucy Island. The bedded rocks dip of 

 the igneous, but the character of the line of junction is such as to lead 

 to the belief that the igneous rock is an intrusion of later date, and has 

 thrust up the strata, acting on them somewhat about the junction. This 

 is also borne out by the fact that no pebbles of the peculiar rock of 

 Lucy Island were found among those of the conglomerates, while 

 diorites like those of the north end of North Island are abundantly 

 represented. In Bruin Bay, rather soft blackish and olive shaly beds 

 occur nearly horizontal in the coves, while the points are of the in- 

 trusive rock. Similar igneous rock is seen on the trail which leads 

 across to Lepas Bay, south of Cape Knox, on the west coast, and appears 

 also to form Cape Knox itself. On the south side of the bay, greyish, 

 blackish and olive coloured shaly beds like those of Bruin Bay 

 occur, dipping nearly due south. They were found in one place to 

 hold thin layers of limestone, which is composed almost entirely of 

 broken shells of Inoceramus, is brown in colour, and gives a slightly 

 foetid odour when struck. These, with some worm-tracks from the 

 same place, were the only fossils found in this area of the Cretaceous. 



Just beyond the south point of the bay last mentioned, the shales are 

 overlain by a massive grey rock which appears to be in great thickness, 

 rather fine grained and apparently a trachyte. Its junction with the 

 shales is well shown, and seemingly quite conformable. It is probably 

 a part of the series, and is traversed in several directions by jointage 

 planes, and sometimes assumes pseudo-columnar forms, giving rise to 

 the pinnacles and jutting crags by which this part of the coast is 

 characterized. 



The subdivisions used in describing the Cretaceous rocks of Skidegate 

 Inlet do not seem to be applicable to those of the north-west extremity 

 of the islands, though it is possible that we have here represented beds 

 referable to Subdivision E. only. The character of the deposit is here 

 pre-eminently littoral, as evidenced by the rough conglomerates. No 

 coal was observed, and the only traces of plants were a few obscure 

 fragments in the rocks of the east coast of North Island. 



Tertiary. 



Trachyte. 



General 

 character of 

 rocks. 



Area of the 

 Tertiary. 



Bocks of Tertiarj^ age, so far as ascertained, occur on Graham Island 

 only. They form the greater part of this island, extending from Skide- 

 gate to Pillar Bay on the north coast, and underlying the low country 

 which forms the north-eastern part of the island probably throughout,, 

 though seldom seen where the drift covering is deep. At the heads of 



