1868.] LOGAN — NEW SPECIMENS OF EOZOON. 307 



to follow, that one of them has afforded farther, and what appears 

 to him conclusive, 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. Vennor, one of the assistants on the 

 Canadian Geological Survey, in the township of Tudor and county 

 of Hastings, Ontario, about forty-five miles inland from the 

 north shore of Lake Ontario, west of Kingston. It occurred on 

 the surface of a layer, three 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 sand- 

 stone, grey close grained siliceous limestone, white coarsely 

 granular limestone, and bands of dark bluish compact limestone 

 and black pyritiferous slates, to the whole of which Mr. Vennor 

 gives a thickness of 1,000 feet. Beneath this zone are grey and 

 pink dolomites, bluish and greyish mica slates, with conglomerates, 

 diorites, and beds of magnetite, a red orthoclase gneiss lying at the 

 base. The whole series, according to Mr. Vennor's section, which 

 is appended, has a thickness of more than 21,000 feet ; but the 

 possible occurrence of more numerous folds than have hitherto 

 been detected, may hereafter render necessary 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 

 considerably in lithological character ; it is therefore supposed that 

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

 Grenville. From the village of Madoc, the zone of grey micaceous 

 limestone, which has been particularly alluded to, runs to the east- 

 ward on one side of the trough, in a nearly vertical position into 

 Elzivir, and on the other side to the northward, through the 

 township of Madoc into that of Tudor, partially and unconform- 

 ably overlaid in several places by horizontal beds of Lower 

 Silurian limestone, but gradually spreading, from a diminution of 

 the dip, from a breadth of half a mile to one of four miles. Where 

 it thus spreads out in Tudor it becomes suddenly interrupted for 

 a considerable part of its breadth by an isolated mass of anortho- 

 site rock, rising about 150 feet above the general plain, and 



