C URRENT PRE- CA MBRIA N LITER A TURE 4 1 5 . 



and Hastings series, felsites and schistose rocks of the Coldbrook, 

 Kingston and Coastal divisions, the apparent equivalents of the rocks 

 of the Sutton Mountain anticlinal. 



Felsitic and syenite rocks of eastern Nova Scotia and northern 

 Cape Breton, with their associated crystalline limestones and 

 serpentines. 



CAMBRIAN 



Cambrian slates, sandstones, and conglomerates. 



General comment. — The succession and correlation proposed in the 

 above papers by Adams and Barlow and by Ells are fundamentally 

 different from the traditional one which has been held in Canada for 

 many years. The first departure is in placing the Grenville and 

 Hastings series as equivalent to the Huronian. Ells goes further and 

 places with the Huronian all the sedimentary rocks of eastern Canada. 

 This usage of the term Huronian restricts the Laurentian to the basal 

 or fundamental gneiss. While the names are different, this is essen- 

 tially the classification proposed by Van Hise in his Correlation Paper 

 — Archean and Algonkian, in 1892. However, in place of Laurentian, 

 he would use the term Archean. Also he would restrict the term 

 Huronian to the rocks of the Original Huronian area and their 

 equivalents. As it is impossible to be certain whether or not sedi- 

 mentary series of eastern Canada not structurally connected with the 

 Original Huronian are really equivalent to it, he has included-the rocks 

 above called Huronian under another name — Algonkian, a broader 

 term covering all pre- Cambrian sedimentaries and contemporaneous 

 eruptives, including the Keweenawan. The essential point, the exist- 

 ence of a non-sedimentary basal complex separated by a profound 

 unconformity from a later pre-Cambrian series, partly sedimentary 

 and partly igneous, is agreed upon. 



Willmot 1 describes the geology of the Michipicoton mining division, 

 which is limited on its eastern side by the 84th meridian, on the west 

 by Lake Superior, on the south by latitude 47 ° 30', on the north by 

 latitude 48 ° 30'. Most of the rocks of the area belongs to the Lauren- 

 tian and Huronian. The northern, eastern, and southeastern portions of 

 the area are occupied by the Laurentian ; the central and southwestern 

 portions by the Huronian. The Laurentian is almost everywhere a fine 



1 The Michipicoton mining division by A. B. Willmot : Report of the Bureau of 

 Mines, Ontario, Vol. VII, 1898, pp. 184-206. 



