CANADA. 



347 



square, of lal)radorite-roct, shewing considerable varieties in cliaracter, aud 



clearly stratified." {I, c, pp. 305-307.) 



Mr. Eiehardson's work, failed to prove his conclup'ons, as the rocKs 

 wore not shown to be sedimentary. 



In 18G8 Mr. J. Marcou wrote regarding the Lain*entian and Huronian 



formations : — 



*' The Luurentian system is composed of the Lower Taconic, to which are 

 added all the Linstratified ciyatalliiie rocks forniiug the centre of the Laurtmtine 

 Mountains, such as granite, syenite, diorite and porphyry, mixing together 

 strata and eruptive rocks, an attempt which was unexpected from a strati- 

 graphical geologist. His Huronian system is formed of a mixture of the St. 

 Albans group of the Upper Taconic, with the Triassio rocks of Lake Superior, 

 the trap native-copper bearing rocks of Point Keeweenaw, and the dioritic dyke 

 containing the copper pyrites of Bruce mine on Lake Huron." (Proc. Post. 

 Soc. Nat. Hist., 1861, VIIL 246, 247.) 



In the Eoport of Progress for 1870-71, Mr. Eobert Bell points out a 

 case of an apparently conformable junction of the Huronian and Lau- 

 rentian rocks. lie remarks : — - 



** From the mouth to the sixteenth portage .... the river [Wliite River] 

 runs entirely upon greyish and reddish gneiss, mostly of a massive granitic 

 character [Laurentian], striking W, S. W., and dipping northward at angles 

 varying from 30° to 80°. It is occasitmally interstratified with bands of dark 

 hornblendic schist and very light grey gneiss. Fine dark green hornblendic 

 schists [Huronian], having the same strike, occur between the' sixteenth port- 

 age and the outlet Similar schists [Huronian], with bands of gneiss, 



appear to rest conformably upon the massive gneisses at a short distance north 

 of the river, all' the way from Natamasagami Lake to the mouth (28 miles)." 

 (L C.J p. 345.) 



Of another locality Mr. Bell, in the Report for 1871-72, states : 



*' Towards the end of the above twenty miles, bands of gneiss become inter- 

 Btratificd with the schists, and just at Martin's Falls the latter have become 

 entirely replaced by red and grey gneiss, apparently shewing a confornviible 

 pass;ige from the Huronian into the Laurentian rocks. AYhat appeared to be a 

 eiuiilar blendinf:^ of these formations was noticed last year in the neighbor- 

 hood of White Lake." {L c, p. 110.) 



In the Report of Progress for 1872-73, Mr. Bell again states, regard- 

 ing the rocks northwest of Lake Superior: 



" As mentioned in the present and in my previous reports on this region, the 

 Huronian rocks appear to succeed the Laurentian conformably, the distinction 

 between the two being chiefly of a lit-hological character. As nearly as the 



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