Animal Nature of Eozobn Canadense. 471 



ine, Loganite, Pyroxene, and Dolomite, an indication that, 

 a similar mould had been filled by diverse minerals. 



At that time the little leisure that I could spare for 

 original work was occupied with Carboniferous and 

 Pleistocene geology, and I had no ambition to invade the 

 great and difficult pre-Cambrian districts of Northern 

 Canada any further than might be necessary to my work 

 as a teacher of geology. In the interest of that work,, 

 however, I had gone over considerable portions of the 

 Laurentian and Huronian districts surveyed by Logan and 

 Murray, with the aid of their maps and reports, and had 

 satisfied myself of the great accuracy of their work, which 

 led in my judgment to the following results : — 



(1) That the upper part of the Lower Laurentian of 

 Logan, since called the Grenville Series, 1 consisted of truly 

 stratified metamorphic deposits, including great and. 

 extensive beds of limestone, quartzife, iron-ore, and other 

 rocks, evidently of aqueous origin, and that the condition 

 and crystalline and chemical characters of these rocks- 

 were not essentially different from those of the altered 

 Palaeozoic beds with which I was familiar in Nova Scotia 

 and New England. 



(2) That the Huronian, a less disturbed, less altered,, 

 and in the main evidently a clastic series, rested uncon- 

 formably on the Laurentian, and was in part composed of 

 its materials. 



(3) That the " Upper Copper-bearing series " of Lake 

 Superior, since known as Kewenian, was newer than the 

 Huronian, but older than the oldest fossiliferous Cambrian 

 rocks then known in Canada. 



(4) That, while the Kewenian and Huronian rocks, and 

 those designated by Logan as Upper Laurentian, indicated 

 by the presence of igneous masses, and, in the case of the 

 two former, by the prevalence of coarse, clastic material ,, 

 littoral conditions and much volcanic disturbance, the- 



l By Dr. Steny Hunt. 



