[ELIS] CANADIAN GEOLOGICAL NOMENCLATURK 23^ 



this opinion lie further remarks : " that some may be supposed to com- 

 pare the Hastings rocks with the lower Silurian of eastern Canada, 

 but the micaceous limestones of Hastings more closely resemble the 

 micaceous limestones which run from ea^^tcrn Canada into Vermmt, 

 on the east side of the Green Mountains, and which from their fossils 

 are known to be Devonian. . . . Their relations are at present 

 under examination, and until a sufficient number of facts are collected, 

 it would be premature to remove them from the horizon in which they 

 had been provisionally placed." This horizon, for the rocks in 

 Marmora, Madoc and other places in Hastings County was, from the 

 finding of the new supposed fossil, Eozoon, now regarded as Laurentian. 



In 1866 Vennor began the careful detailed study of these rocks in 

 the field, and to these the name Hastings series was now attached. As a 

 result of his investigations they were first arranged into three groups, 

 A, B and C, of which the lower or A consisted of reddish gneiss, with 

 some limestones; the second of hornblende and pjToxenic rocks, with 

 mica schists and epidotic and chloritic strata ; while the third was largely 

 made up of magnesian limestones, with slates and quartzites, gneiss and 

 conglomerates. The Eozoon was found in the rocks of the third division, 

 and the resemblance of certain rocks of division 2, to the Huronian else- 

 where was pointed out in the report on this district, in 1868 69. 



The rocks of this series were studied by Vennor for several years, 

 and the results of his investigations appeared in various reports, extend- 

 ing down to 1877. That for the years 1870-71 summarized the work 

 up to that time, and in this the rocks of the lowest of his three divisions, 

 A, comprising the syenite and granite-gneiss, with crystalline lime- 

 stones and magnetic iron ores, were regarded as Laurentian, while the 

 rocks of the other divisions were supposed to more closely approach the 

 Huronian. On the whole, however, the conclusions reached in this 

 volume are very similar to those expressed in 1869. In regard to the 

 occurrence of Eozoon, which was supposed from the first to be peculiar 

 to the Laurentian rocks, it was now held to occur, not only in the rocks of 

 this system, but was also found in the upper portion of the third division, 

 which on other grounds might be assigned to the Huronian. 



In the report for the next year, 1871-72, our knowledge is not 

 greatly advanced. As regards the position of the several members of 

 the crystalline series as originally proposed by Vennor, the rocks of 

 division B, are now regarded as resting upon the flanks of a granite mass 

 belonging to division A, which Vennor then regarded as an intrusive 

 or eruptive rock, assignable to the close of the Laurentian, or prior to 

 the deposition of the schistose rocks B and C; so that on this evidence 

 the rocks of these two divisions would appear to be newer than Lauren- 

 tian, and might reasonably be classed as Huronian. 



