18 DD 



HUDSON S STRAIT AND BAV. 



Quartzites of 

 Luke Huron. 



Associatod 

 rocks. 



Jill lie within the general geographical limits of the Laurentian coun- 

 try, and are either stratigraphically incorporated amongst the mem- 

 bers of the Laurentian series, or present no want of conformity to 

 them. A variety of altered rocks, bearing a strong resemblance to 

 those of some of the Iluronian bands are found elsewhere, as in the 

 Eastern Townships and New Bi-unswick, but their relations to the 

 Laurentian system cannot be so easily determined. 



The series of rocks on the north side of Lake Huron, to which the 

 name Huronian was first applied, is made up largely of <|uartzites, but 

 to the north and west of this region these form only a minor portion, 

 or are altogether Avanting in the bands called Huronian, and which are 

 composed jjrincipally of the other rocks, associated with the Lake 

 Huron quarzites. They consist of more or less massive diorites, argil- 

 laceous and dioritic slate-conglomerates, granites and syenites, schis- 

 stose and jasper^' iron ores, limestones or dolomites, and imperfect 

 gneisses, together with a great variety of schists, such as mica and 

 hydro-mica, talcoid, chloritic, dioritic, argillaceous, silicious, epidotic, 

 hornblendic, felsitic and dolomitic. Within the general limits of the 

 Uj,g,y, Laureantian area, nearly all the metallic ores and other useful 



Huronhiii'rocks"'^"®'"^'^' ^^ J^^ known, have been found in these rocks, and, 

 * therefore, their discovery and correct delineation on the geological 



map are important. As far as our explorations have gone, rocks 

 of these kinds, and which may for convenience be styled Huronian, 

 are much more abundant in the region between the Great Lakes and 

 Hudson's Bay than anywhere in the Labrador peninsula or north of 

 Hudson's Strait. They have been found at three places on the east 

 coast of James' and Hudson's Bay. (See Eeport of ISTY.) Mr. John 

 McLean mentions them south of Ungava Bay. Some of the rocks of 

 Nachvak, on the Atlantic coast, maybe classified with them; and 

 they are believed to occur at Bamahand near the entrance of Hamilton 

 Inlet, on the same coast. / 



Oeofrrapical 

 distribution 

 of Huiouiitn 

 ro«ks. 



Geology op the West Coast of Hudson's Bay. 



During the past season I have received from a fi-iend a carefully 

 labelled collection of rock-specimens fi'om the north-west coast of 

 S''ch™*terfie"d Hudson's Bay, between Eskimo Point and Chesterfield Inlet ; and in 

 connection with these a few remarks may be made on the geology of 

 this region. Other specimens from this part of the coast were obtained 

 in 1884 and referred to in my report for that year (page 34: D D.) My 

 own explorations on this coast, beyond Churchill, consist of a boat 

 voyage to a point a short distance north of Button's Bay, in 18^9, and 



Inlet. 



