58 B GEOLOGICAL SURVEY OF CANADA. 



Shuttle Island, entrance to Kose Harbour. The rocks of Shuttle Island are generally 

 more or less schistose, and in some places are very markedly so. They 

 are greyish and greenish in colour, and felspathic or dioritic in compo- 

 sition. In one place on the east side a pale grey talcose shist occurs, 

 and the schists are interbedded with limestone or coarse marble in thin 

 layers at the southern extremity of the island. This horizon is almost 

 certainly the same with that of the entrance to Hutton Inlet, above 

 described. Similar felspathic and dioritic rocks, though not so dis- 

 tinctly schistose, form the west side of Lyell Island, with the exception 

 of False Bay, where flaggy, blackish argillites appear, and run south- 

 eastward in a low couutry toward Sedgwick Bay. 

 'Crescent Inlet. The anticlinal of Darwin Sound probably runs up Crescent Inlet to 

 the north, turning westward with its extremity. In Klun-kwoi Bay 

 the rocks so far as seen are rather dioritic than felspathic, and in some 

 places evident amygdaloids. Argillites appear on both sides of Crescent 

 Inlet. In one place on the south-west shore these were found to be 

 fossiliferous, containing fragments of moulds of an ammonitoid shell 

 of the same species as those from Houston Stewart Inlet, also a small 

 Pecten or Aviculopecten. 



Conglomerate A band of black calcareous argillites with flaggy limestones, in all 

 about 30 feet in thickness and dipping N. 80° W. < 50°, was here also 

 observed to be intercalated between two masses of conglomerate made 

 up of fragments of crystalline rocks, with limestone and pieces of 

 argillite like the surrounding beds. The lower conglomerate is sharply 

 bounded above by the base of the argillites ; the upper rests on a broken 

 and disturbed surface of the argillites, evidencing some unconformity 

 by erosion. This little section is rather puzzling, but appears to repre- 

 sent on the whole a conglomeritic mass forming a portion of the great 

 argillite band. White Point, at the east side of the entrance to 

 Crescent Inlet, is composed of pale felspathic rocks, which are probably 

 intrusive. 



Area of newer To the north-east of the belt of rocks just described, which character- 



vo came 10c s. .^^ ^ e south-west side of Juan Perez Inlet and Darwin Sound, is an 

 extensive area differing in general lithological character from most of 

 the rocks previously met with, and probably representing a higher 

 part of the series. This area, which seems to be a broad synclinal, 

 though complicated by many minor irregularities and folds, has a 

 length of about thirty-one miles in a north-west and south-east direc- 

 tion, with a probable average width of five to six miles. It embraces 

 a great part, at least, of Eamsay and adjacent islands, and of Lyell 

 Island, composes Tan-oo Island and the narrow promontory separating 

 Logan and Dana Inlets, and appears to characterize the greater part 

 of the shores of Selwyn Inlet. The synclinal then seems to turn 



