QUEEN CHARLOTTE ISLANDS. GO B 



Island, crossing it with considerable width about the middle, and run- 

 ning thence to the south-east end of South Island. They constitute the 

 whole north shore of Bear-skin Bay and the greater part of Lina Island. ^™'f h w ( r ; u ~ 

 Westward, after a gap occupied by the upper beds, they reappear at 

 Shallow Bay, and run thence northward, past the coal mine and up the 

 valley of Slate Chuck Creek. They form the shore for a breadth of 

 over a mile in the vicinity of Salt Spring Bay, and in a compressed and 

 partly overturned synclinal occupy the entire width of the Long Arm, 

 appearing in a zone of variable thickness on both shores. A short distance 

 north-west of Steep Point, a promontary is composed of rather massive 

 sandstones of this series, the thickness of which must be about 600 

 feet. These appear again at Young Point, on the opposite side of Long 

 Arm. 



On the south shore, east of Alliford Bay, the rocks described on 

 page 70 B. are also probably referable to subdivision C. 



The thickness of subdivision C, though variable, is great. On the Thickness, 

 north side of Bear-skin Bay, south of the main fault, the section appears 

 to be undisturbed, and would indicate a thickness of about 5000 feet, 

 the summit not being seen. On Lina and Maude Islands, the thickness 

 was estimated at about 4200 feet. North of Shallow Bay, near the coal 

 mine, the thickness of the entire subdivision is probably not over 3200 

 feet, unless undiscovered faults affect the section, while in Long Arm, 

 the part included in the fold is not over 1800 feet thick. 



D. Agglomerates. — Subdivision D. forms the mass of Mount Seymour, Subdivision D. 

 and the mountains on both sides of Long Arm, the greater part of the 

 eastern end of Maude Island, Leading Island and islets adjacent, and 

 in a horse-shoe-shaped synclinal surrounds Alliford Bay, and the low 

 land at its head. On the north shore it stretches north-eastward from 

 the point next west of Image Point for at least three miles, and forms 

 Bare and Tree Islands. Its great spread here is accounted for by the 

 fact that it is undulating at angles not very high. The thickness of Thickness. 

 the rocks is estimated at about 3500 feet. They are almost exclusively 

 of volcanic origin, though some layers show traces of water action in 

 the rounding of fragments. Some beds may have been flows of molten 

 matter, but most are of a fragmental character, either agglomerates 

 or tufaceous sandstones, of greenish, greyish, brown or purple tints. Lithoiosieal 

 On the east end of Maude Island, and near Leading Island, some' 

 fragments are four or five feet in diameter. The material is almost 

 everywhere predominantly felspathic, and some specimens resemble 

 typical porphyrite of rather coarse grain. At the east side of the 

 point north of Alliford Bay, hard dark tufaceous sandstones are found 

 graduating into agglomerates, some of which, however, have their 

 fragments so well rounded as to be more appropriately designated 



