296 ^rof. Bonney — Eozoon at Cote St. Pierre. 



sometimes in plates as much as half an inch in diameter, and in one 

 place the Eozoon was cut by a vein of about the same width filled 

 with this mineral. In another case a micaceous band lay parallel 

 with the surface of the Eozoon, separated from it by a zone of 

 irregularly mixed calcite and serpentme (rather decomposed), about 

 an inch in thickness. The pyroxene, in one part of the knoll, formed 

 a mass, and contained an acicular tremolite, probably occurring as 

 a vein (but this was not quite clear) ; and on the moi'e northern flank 

 was a rather coarsely crystalline rock, chiefly consisting of felspar; 

 tliis probably was a vein-product, and may be connected with an 

 intercalation of gneiss.^ 



The general strike of the apparent bedding suggests that this 

 second mass is considerably higher in the group than the former 

 one, but Sir J. W. Dawson expressed the opinion that the two were 

 approximately on the same horizon, and that a flexure or thrusting 

 towards the east had occurred. So far as one could judge from 

 the outline of the country, the underlying mass of coarse gneisses, 

 already described, was at about the same distance as before, so that 

 this probably is the correct interpretation. 



E. W. 



Fig. 2. — Probable succession at Cote St. Pierre. 



1. Lower Gneiss. 3. Crystalline Limestone (Eozoonal). 

 1^. Quartzite. S''. Intercalated Gneiss. 



2. Pyroxenite. 4. Upper Gneiss. 



The third mass is rather further up the valley, and also on the 

 lower ground.^ This is a rugged knoll of crystalline limestone, in 

 which pits have been dug, one of them to obtain apatite. The hole 

 was full of water, but I found some specimens. The mineral 

 assumed two forms: (1) well-defined crystals of a greenish-grey 

 colour, from a quarter to half an inch long, in calcite ; (2) less 

 regularly crystallized and of light cobalt-blue colour, with the same 

 mineral and pyroxene. The apatite apparently occurred as a vein- 

 product. A short distance from this was a good development of the 

 Eozoonal structure, associated with pyroxene ; the latter in masses 

 of concretionary aspect, very irregular in outline and mode of 

 occurrence. As before, the Eozoon formed an enclosing zone, up to 

 a thickness of about four inches, and then passed rapidly into a 

 crystalline limestone, containing granules of pyroxene or serpentine. 

 In one part of this knoll the limestone is distinctly micaceous, and 

 the following succession is exposed in ascending order, beginning 



1 This rock is a normal but perhaps rather fine-grained gneiss, inclined to be 

 " platy " in structure. I do not remember that there was anything to suggest that 

 it was intrusive ; it seemed to pass rather rapidly into the limestone, but more as one 

 sedimentary rock passes into another. 



* The name of the owner was either Lavere or Laval ; the farm was No. 10. 



