QUEEN CHARLOTTE ISLANDS. 51 B 



strikes. These are supposed to underlie the limestones above described. 

 Small quartz veins with a little copper pyrites were observed at one 

 place. At Forsyth Point, on the north side of Houston Stewart Houst™ part ° f 

 Channel at its east entrance, the rock is a massive granitoid diorite or |gf wart Chan ~ 

 hornblendic granite, containing fragments of darker rocks like those 

 elsewhere forming a part of the stratified series, and traversed by 

 dark greenish dykes of porphyritie felspathic rock. At Point Langford 

 contorted fragments of much hardened argillites rest in a grey-green 

 felspathic and porphyritie matrix. From this point round the pro- 

 montory to Islet Point, forming the southern entrance point of Car- 

 penter Bay, the widest expanses are of blackish and greenish argillites, 

 much altered, disturbed and traversed by dykes, but nevertheless in a 

 few places holding impressions of a manj^-whorled, strongly-ribbed 

 ammonitoid shell, perhaps a species of Clydonites. The ribs bear a single 

 row of nodes or spines near the periphery. This is very different to 

 either of the Ammonitoid shells from Houston Stewart Inlet. East of 

 Islet Point these rocks seem to forma broad curve with general north- 

 easterly dips at moderate angles, the highest rock seen being a massive 

 grey-green porphyritie material like a much altered agglomerate. 



The rocks in Carpenter Bay are so much disturbed that there is Rocks of Car- 

 little chance of getting any general idea of their arrangement. They penterBay - 

 are, however, doubtless of the same age with those of Houston Stewart. 

 Argillites are largely represented, but are everywhere cut up and 

 interfered with by dykes, so much so that in some places fragments only 

 of the sedimentary rocks remain, contorted or steeply tilted. Other 

 areas are characterized by greenish-grey felspathic diorites, of fine 

 grain and often epidotic. It is difficult to say whether these are altered 

 volcanic beds or intrusive masses. At Iron Point, on the north side 

 of the entrance to the bay, are considerable exposures of hard greyish 

 felspathic sandstones, which occasionally become conglomeritic and 

 hold blackish shaly fragments. The dips are undulating, and the 

 formation at this place on the whole nearly flat. Pyrites in small 

 concretionary masses is found in the sandstones, and causes them to 

 assume on weathering a rusty appearance. They are also very hard 

 and somewhat peculiar in appearance, leading at first to the belief 

 that they might be in part of volcanic origin. This, however, is not 

 the case, Under the microscope they are found to consist chiefly of 

 quartz, particles of dark argillites, and a pale fine-grained laminated 

 rock which may be a quartzite. 



In Skincuttle Inlet limestones are well represented, and would afford Skincuttie 

 a means of tracing out in detail the structure of the rocks, were suffi- n et * 

 cient time devoted to this purpose. On the east side of the entrance 

 to Harriet Harbour, flaggy limestones, with some much altered argillites, 



