CANADA. 



353 



III. Diorite and ITornblenJe Schist Group. 



IV. Crystalline Linrestono and Hornblende Rock Group. 

 Y. Gneiss and Crystalline Limestone Group. 



YL " Embracing coarse ortlioclase gneisses, felsites, garnetiferoiis gneisses, 



pyroxenites, crystalline limestones and white ^quartzo-orthoclase 

 rock.'' 



From its lithological characters he thought it probable that the mica 



schist group (I.) should be placed near the summit of Division B, and 



beneath the gray calc-schists and impure limestones of Division C of the 



Hastings scries. lie also states that the belt of red gneiss (Division A, 

 Hastings scries) 



"separates the mica-schist group (I.) from the dolomite and slate group (XL)- 

 It appears to overlie the former, and invariably shows the same constant dip to 

 the south-east and east. But extended observations on its course for a number 

 of miles seem rather to show that its present position is due to an uplift or 



overturned elevation of an older gneiss series Therock is a fme-grained 



granitic gneiss, composed largely of flesh-colouTed feldspar and greyish quartz, 



and (.lilFering in no respect from most of the gneisses heretofore described as 

 Lower Laurentian." 



Group Y. was found apparently overlying Group lY., the limestone 

 group. It would seem that Eozoon had been found in Groups III. and 

 lY. {L c., pp. 105-165.) 



Mr. Selwyn, the next year, in quoting from Mr. Ycnnor's work, 

 writes : — 



" The geological structure of this section of the country is exceedingly intri- 

 cate, but when worked out will be both important and instructive. It is now 

 apparent that the rock groups referred to in my last report as I. II. HI. and 

 lY., constitute together the lower members of one s^reat crvstalline series, 

 while Y. and YL, of the same report, constitute its upper members. Tliese 

 groups include the so-called Hastings series of the earlier reports, and the 



Eozoon has now been found from the lowest to tlie highest group 



Throughout this .region the lowest rock is a massive red, orthoclase gneiss, in 

 which, as a rule, no bedding planes can be recognized, and the groups above 

 enumerated overlie it in, probably unconformable se(]uence. In many places, 

 in connection with the Bonnechere limestone trough, labradorite rocks were 

 ol)served, but these appear to be quite conformable with the rest of the series." 

 (Report of Progress, 1875-76, p. 4.) 



In the Eeport of Brogress for 1876-77, Mr. Yonnor remarks : 



*' Now these rocks represent Division B, and a part of C, of the Hastings 

 series which hav^ be^n compared, by some investigators, to the Huronian, but 

 VOL. VII. —JHO. IL 23 



