82 PEOCEEDINGS OE THE GEOLOGICAL SOCIETY. 



lines to layers of considerable thickness. Foliation may be said to 

 be parallel with the apparent bedding, as the minerals are arranged 

 with their longer axes roughly in the plane of the bands, but there 

 is little tendency to split along these. Moreover, the rock in many 

 places exhibits no indication of subsequent crushing. Here and 

 there, however, the mineral layers are considerably corrugated. The 

 following sentence from my Journal sums up the results of a traverse 

 of many miles : — " The same sort of gneiss continues, now darker, now 

 lighter, now coarser, now finer, sometimes almost horizontal, some- 

 times dipping at high angles." Beds of mica-schist and crystalline 

 limestone occur occasionally, not to mention hornblendic masses of 

 more dubious origin. The evidence of a stratified arrangement in the 

 Grenville group seemed to me very strong in the neighbourhood of 

 Cote St. Pierre. In that district, one of the localities where the pro- 

 blematical Eozoon canadense occurs, we have the following succession, 

 apparently in ascending order : — (1) Highly quartzose gneiss (rather 

 coarse) — quartzite of Sir W. Logan ; (2) Dark mica-hornblende gneiss ; 

 (3) Crystalline limestone with Eozoon^ containing a thin intercalated 

 band of gneissose rock, and in one place, probably high up, becoming 

 rather distinctly micaceous ; (4) well-banded felspathic gneiss. It is 

 possible that the section may exhibit more variations than this, but I 

 make a very large allowance for repetition by faulting, and omit one 

 or two rock-masses of uncertain origin. I rest no argument on the 

 Eozoon, because this structure is at present too much a matter of dis- 

 pute among geologists to be available in controversy. I will merely 

 say that the crystalline limestone in which it occurs appeared to me to 

 be truly interbedded with the gneiss, and not to be the result of any 

 kind of infiltration. Yet stronger evidence of stratification may be 

 found at Papineauville, where, according to the Canadian geologists, 

 the limestone band of Cote St. Pierre reappears on the other side of 

 a trough. Here we have the following succession, the beds being 

 nearly vertical : — (1) Gneiss, medium-grained ; (2) calc-mica- 

 schist ; (3) black mica-schist ; (4) calc-mica-schists of variable cha- 

 racter and coarseness ; (5) granite (pegmatite) intrusive ; (6) calc- 

 mica-schist ; (7) coarse crystalline limestone ; (8) calc-mica-schist ; 

 (9) quartzose gneiss. Between (1) and (2) there is an interval in 

 which rock is not exposed, and, between (8) and (9), another in 

 which there are only occasional outcrops of calc-mica-schist and 

 crystalline limestone, but the rest are exposed, generally very per- 

 fectly, in a shallow cutting opposite to the railway station. The 

 foliation coincides with the apparent bedding, and I could not explain 

 what I saw by anything but some kind of stratification. Microscopic 

 examination fully confirms the above conclusions ; moreover, the 

 slides give no indication of a crush-structure, although we might 

 under the circumstances have expected it. Prom (2) to (8) is 

 approximately 70 or 80 yards*. 



* My notes are not quite clear. I had to measure hurriedly, but all these 

 beds are far more thnn mere layers ; for instance, the black mica-schist is 

 quite 16 paces wide, and on the east side passes rapidly into calc-schist, poor 

 in mica. 



