GEOLOGY. 167 



over 6000 feet, and resembles closely that of Nova Scotia, in- 

 cluding* limestones and gypsums. The largest coal-seam 

 found has a thickness of three and a half feet. The Carbonif- 

 erous rocks rest upon the Laurentian and upon the Potsdam. 



These crystalline rocks, which overlie unconformably the 

 uncrystalline Levis and Sillery beds, and are in their turn 

 overlaid unconformably by the uncrystalline Loraine shales, 

 are described in more detail as consisting, besides the rocks 

 already mentioned, of greenish feldspathic and hornblendic 

 rocks, serpentines, diallages, argillites, talcose and chloritic 

 schists, and rusty- weathering dolomites. They include the 

 great copper -mines of Tilt Cove and Terra Nova, and are 

 identical with the crystalline Huronian rocks of the Atlantic 

 belt. Reference to the Record for 1876 (page xcviii) will 

 show the evidence there adduced in favor of the view that 

 the Sillery is really a lower division than the Levis; that the 

 unaltered Quebec group, as hitherto described, is an inverted 

 series, the normal position of the Sillery being below, and not 

 above, the fossiliferous Levis division ; and, finally, that the 

 so-called altered Quebec group is an older crystalline series. 

 It is pretty evident to those who have studied critically the 

 Atlantic belt that the apparent uncomformable superposition 

 of these crystalline rocks to the Sillery and Levis in New- 

 foundland is nothing more than the phenomenon so often seen 

 alonsr this belt of the older rocks overriding: an overturned 

 fold of the fossiliferous strata. It may be added, in this con- 

 nection, that the work of the geological survey of Canada 

 during the past year in the province of Quebec has shown 

 the truth of the view so long maintained by the writer, that 

 the crystalline schists of the Green Mountain belt are, in their 

 normal position, found unconformably beneath the fossiliferous 

 strata of the Quebec group. The relations sustained by them 

 in Newfoundland to the Cambrian rocks, on the one hand, and 

 the Siluro-Cambrian, on the other, can only be explained by 

 admitting a period of disturbance, accompanied by folding, 

 subsequent to the Chazy period and previous to the Loraine. 

 This doubtless corresponds to the great continental move- 

 ment, which, as we know, immediately preceded the deposi- 

 tion of the Trenton limestone in the St. Lawrence valley. 



Milne, who has studied with Murray some of these points 

 in the geology of Newfoundland, adopts the notion that the 



