1867.] logan eozoon. 253 



May 8, 1867. 



H. Cooper Eose, M.D., E.L.S., Hampstead, N.W., was elected a 

 FeUow. 



The foUowing communications were read : — 



1. On New Specimens of Eozoon. 

 By Sir W. E. Log.in, E.E.S., E.Q.S. 



Since the subject of Laurentian fossils was placed before this 

 Society in the papers of Dr. Dawson, Dr. Carpenter, Dr. T. Sterry 

 Hunt, and myself in 1865, additional specimens of Eozoon have been 

 obtained during the explorations of the Geological Survey of Canada. 

 These, as in the case of the specimens first discovered, have been 

 submitted to the examination of Dr. Dawson ; and it will be observed, 

 from his remarks contained in the paper which is to follow, that 

 one of them has afforded further, and what appears to him con- 

 clusive, evidence of their organic character. The specimens and 

 remarks have been submitted to Dr. Carpenter, who coincides with 

 Dr. Dawson ; and the object of what I have to say in connexion 

 with these new specimens is merely to point out the localities in 

 which they have been procured. 



The most important of these specimens was met with last summer 

 by Mr. G. H. Yennor, one of the assistants on the Canadian Geological 

 Survey, in the township of Tudor and county of Hastings, Canada 

 "West, about forty-five miles inland from the north shore of Lake 

 Ontario, west of Kingston. It occurred on the surface of a layer, 



inches thick, of dark-grey micaceous limestone or calc-schist, near 

 the middle of a great zone of similar rock, which is interstratified 

 with beds of yellowish-brown sandstone, grey close-grained sihceous 

 limestone, white coarsely granular limestone, and bands of dark- 

 bluish compact limestone and black pyritiferous slates, to the whole 

 of which Mr. Yennor gives a thickness of 2000 feet. Above this 

 zone are reddish granitic gneiss, and a great thickness of green 

 diorite-slates ; while beneath it are grey and pink dolomites, bluish 

 and greyish mica-slates, grey sihceous whetstone -slate, with whitish 

 brown-weathering dolomites, which often pass into coarse conglo- 

 merates, enclosing a multitude of large well-rounded masses of 

 gneiss, syenite, and quartzite ; to which succeed whitish highly 

 crystalline limestone, dark-green chlorite -slates, with workable beds 

 of magnetic iron-ore, and at the base red orthoclase felspathic rocks. 

 This series, according to Mr. Yennor's section (which is appended), 

 has a thickness of 2000 feet ; but the possible occurrence of more 

 numerous folds than have yet been detected may hereafter require a 

 considerable reduction. 



These measures appear to be arranged in the form of a trough, to 

 the eastward of which, and probably beneath them, there are rocks 

 resembling those of Grenville, from which the former differ con- 

 siderably in hthological character ; and it is therefore supposed that 

 the Hastings series may be somewhat higher in horizon than that of 



t2 



