QUEEN CHARLOTTE ISLANDS. 61 B 



zone, though probably most closely connected with the flaggy argillites, 

 is persistent near the base of the overlying volcanic series, and that if 

 there be any unconformity between the two it must be slight. 



To the east of this area of volcanic rocks newer than those of the Kun-ga Island. 

 southern extremity of the islands, Kun-ga Island yet remains to be 

 noticed. The inner or west end of the island is composed of hard 

 greenish dioritic rocks like those elsewhere found below the massive 

 limestone. The small island named Ti-tul, which lies off' the north 

 shore of Kun-ga, is composed of limestone, which also forms the north Limestone, 

 point of Kun-ga, and runs across it in a south-south-easterly direction. 

 To the east of the limestone, and apparently following it conformably, 

 with general eastward dips at high angles, or nearly in a vertical posi- 

 tion, is a great series of flaggy blackish argillites, thin limestones and 

 argillaceous sandstones. A few fossils, similar to those of the first- Fossils, 

 mentioned locality in Houston Stewart Channel, and of Triassic age, 

 were obtained. If the upper volcanic series described in preceding 

 paragraphs rests conformably above the argillites and associated rocks, 

 it must be supposed either that a fault separates these rocks from 

 those of the east end of Tan-oo Island, or that the limestones and 

 argillites are folded over an anticlinal axis running north-north-east 

 and south-south-west through the western part of Kun-ga Island, and 

 that their westward-dipping portion is concealed below the water 

 between the two islands. 



At the north entrance point of Selwyn Inlet, massive limestones are Limestones of 

 again found, and on the coast between this point and the bottom of 

 Skedans Bay, limestones and argillites are the most abundant rocks, 

 the part of the series characterized by these materials being appar- 

 ently several times repeated by folds. Point Vertical is a remarkably 

 bold spur between two bays, composed of massive beds of limestone 

 nearly on edge, and aggregating at least 400 feet in thickness. The 

 limestone is grey, with the stratification well marked by layers charged 

 with black eherty concretions, and by the solvent action of the water 

 along certain planes. Some layers have a curious concretionary struc- 

 ture. They are traversed in all directions by little siliceous veins as 

 thin as paper, the polygonal forms included between which have a 

 superinduced concentric structure. North of Point Vertical are two 

 islands which maybe called Limestone Islands. On the inner of these Limestone and 

 the massive eherty limestone, with a dip of ]ST. 16° E. < 40, is seen to neous igneous 

 lie directly upon an igneous material, resembling that found in a simi- ie 

 lar position in Skincuttle, and consisting of a fragmental grey felspathic 

 rock holding pyritous and calcareous concretions. The adhesion of the 

 limestone to the igneous series is thus conclusively shoAvn by its con- 

 formable superposition on igneous rocks of precisely the same character 



