tt] CANADIAN EXTENSION. 121 



under consideration should be referred to the Cambrian or to some 

 of the pre-Cambrian series of rocks. In a review of Dr. Ells's work by 

 Mr. C. D. Walcott 1 it is suggested that from the occurrence of Lower 

 Cambrian fossils (the Oleuellus fauna) in grayish limestone interbedded 

 with purple, green, and black slates, in Washington County, New 

 York, the rocks containing them occupy a similar stratigraphic position 

 to those described by Dr. Ells in the Canadian section. Dr. Ells con- 

 sidered that portions of the strata referred to the Lower Cambrian are very 

 much like those of the gold series of Nova Scotia, while, in part, they re- 

 semble the Cambrian of New Brunswick. Stratigraphically they occupy 

 a position between the chloritic and micaceous schists of the Archean 

 and the superjacent Sillery. 2 



The Canadian extension of the rocks referred to the Cambrian System 

 by Prof. C. H. Hitchcock in New Hampshire is represented upon the 

 geological map of Canada, published by Sir William E. Logan in 1864 as 

 the Quebec group, thus being identified with the Quebec group series 

 upon the western side of the Gaspe" limestone series. References have 

 been made to them by various authors who have written upon the geol- 

 ogy of the townships of eastern Quebec, but not in a manner to distin- 

 guish the strata now referred to the Cambrian. 



When describing this belt of rocks in 1886, Dr.R. W. Ells 3 states that 

 Prof. Hitchcock has referred a belt composed principally of blackish, 

 wrinkled slates and schistose sandstones, which form a ridge extending 

 northeast from the vicinity of Canaan, between Hall's and Indian 

 streams to the Quebec boundary, to the Lower or Cambrian system. 

 The strata present a well defined anticlinal structure, which is recognized 

 in the adjoining townships of Emberton and Ditton in Quebec, and 

 northeast past the outlet of Lake Megautic and onward to the Maine 

 boundary. The slates are penetrated by quartz veins, which in places 

 have proved more or less auriferous. 



In character and aspect the gold-bearing slates of Ditton and the area to the north- 

 east almost exactly resemble, as already intimated, the rocks of the Nova Scotia gold 

 series. 4 



As far as known no fossils have been found in this series to identify 

 the horizon, in either New Hampshire, Canada, or Maine. This is true 

 also of the second area inclosed on either side of the Stoke Mountains 

 and the Sherbrooke anticlinal. The strata forming the western area 

 west of Sutton Mountain anticlinal have already been mentioned. 



The presence of rocks of supposed Cambrian age is indicated on the 

 geological map of Canada, published in 1882, on the eastern side of 

 Hudson's Bay, near the mouth of Big Whale River, and in the vicinity 



1 A review of Dr.R. W. Ells's second report on the geology of a portion of the Province of Quebec, 

 with additional notes on tho "Quebec group. '' Am. Jour. Sci., 3d ser., vol. 39, 1890, p. 101-115. 



* Ells, R. W. Second report on the geology of a portion of the Province of Quebec. Gcol. Surv. 

 Canada, vol. 3, 1889, p. 87K. 



'Report on the geology of a portion of the eastern townships of Quebec. Geol. Surv. Canada, 1886, 

 new ser., vol. 2, 1887, pp. 24J 25J. 



4 Op.cit., p. 25 J. 



