QUEEN CHARLOTTE ISLANDS. 65 B 



They are in the form of a shallow synclinal, with several minor undu- 

 lations, and have a thickness of not less than about 1500 feet, though 

 the summit of the group was not recognized. They contain few fossils, 

 the only form recognized being Inoeeramus probiematicus. Reef Island 

 is also formed of these shales, and they no doubt underlie a considerable 

 area which is concealed by water between Nose Point, Triangle Island 

 and the group of islands of which Burnt Island is the largest. 



B. Conglomerates. — The rocks of this subdivision are for the most part Subdivision B. 

 well rounded conglomerates, interbedded with grey and yellowish sand- 

 stones, which in some places are very regularly stratified. The pebbles, 

 which in some layers are several inches in diameter, are generally de- 

 rived from the older more or less distinctly crystalline rocks of the 

 islands, but occasional rounded shaly fragments like some of the 

 rocks of the next underlying subdivision are found, with other evidence 

 of slight erosion in progress during the deposition of the conglomerates, 

 but not such as to indicate any true unconformity. The dolomitic 

 character of the upper layers of the conglomerate has already been 

 referred to in connection with the overlying subdivision. The thick- 

 ness of the conglomerate appears to be greater toward the southern 

 part of the area under description, where the} 7 spread out widely. At ne a s " abIe thick 

 the west end of Maude Island, and near Christie Bay, the thickness was 

 estimated at over 3000 feet, while north of Lina Island it appears not 

 to exceed 1900 feet. An average thickness of about 2000 feet may be 

 assumed for this subdivision. 



On the north side of the inlet, about the mouth of Slate Chuck Creek, Continuation 

 the conglomerates form a wide belt which apparently runs up inland n ° 

 toward Nipple Mountain. They are, however, much disturbed, and 

 probably affected by undiscovered faults. North of Lina Island they 

 leave the shore with a northerly course, and are supposed to bend round 

 to the eastward, conformably to the strike of the underlj'ing rocks, 

 reaching, probably, to the main fault near Double Mountain, of the 

 Admiralty chart. An outlying patch on the west end of Lina Island 

 consists, where seen along the shore, chiefly of sandstones, and appears 

 to be the point of a synclinal cut-off to the north by the fault just 

 referred to. The centre of the peninsula at Withered Point is another 

 small outlier. Burnt, Wedge, Angle and Tree Islands, with the west Conglomerate 

 end of Maude Island, form a connected series of conglomerate exposures, 

 and show high south-westerly dips. The same zone, with lower dips, 

 is supposed to cover the north-western half of South Island, and spreads 

 over both sides of the entrance to the narrow channel which leads from 

 South Bay to the west coast. From Nose Point to Christie Bay similar 

 rocks continue to prevail, near the first-named place, with low dips off 

 shore, but near Christie Bay becoming disturbed and eventually verti- 

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