CANADA. 353 



III. Diorite ami flornblemle Schist Group. 



IV. Ciystalline Limestone and Ilornblentle Rock Group. 

 V. Gneiss ami Crystalline Limestone Group. 



VI. " Embracing coarse ortlioclase gneisses, felsites, garnetiferous gneisses, 

 pyroxenites, crystalline limestones and white (|uartzo-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 series. He also states that the belt of red gneiss (Division A, 

 Hastings series) 



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

 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 The rock is a fine-graineil 



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

 and diffrring in no respect from most of the gneisses heretofore described as 

 Lower Laurentian." 



Group V. was foilnd apparently overlying Group IV., the limestone 

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

 IV. (/. c, pp. 105-IG5.) 



Mr. Selwyn, the next year, in quoting from Mr. Vennor'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. 11. III. and 

 IV., constitute together the lower members of one great crystalline series, 

 while V. and VI., of the same report, constitute its upper members. These 

 groups include the so-called Ha.stings series of the earlier reports, and the 



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



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

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

 enumerated overlie it in, probably unconformable sequence. In many places, 

 in connection with the Bonnechere limestone trough, labradorite rocks were 

 observed, but these appear to be quite conformable with the rest of the series." 

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



In the Report of Progress for 1876-77, Mr. Vennor remarks : — 



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

 series which have been compared, by some investigators, to the Huronian, but 



VOL. VII. NO. 11. 23 



