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II.—On the Mode of Occurence of Eozoon Canadense at Côte St. Pierre

Published online by Cambridge University Press:  01 May 2009

T. G. Bonney
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Extract

The question of the origin of Eozoon Canadense has been recently revived in an important and most interesting paper on a similar structure in blocks of limestone ejected from Vesuvius. The writers, however, of that paper evidently found that more information existed as to the microscopic structure of the Canadian Eozoon than as to its mode of occurrence, so that a few notes on this subject may be of some use as a contribution to the discussion. I visited one of the most noted localities for Eozoon—Côte St. Pierre—in 1884, when I had the inestimable advantage of being conducted by Sir J. W. Dawson, to whose unwearied kindness and hospitality I was so often indebted during my stay in Canada. I made careful notes and rough sketches of what I saw, collected a fair suite of specimens, and paid especial attention to the relation of the structure to other parts of the rock-masses. Upon the question of the origin of Eozoon I do not purpose to enter: I shall restrict myself to stating facts of which, as it seems to me, account must be taken in all attempts to interpret this extraordinary structure.

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 7 , July 1895 , pp. 292 - 299
Copyright
Copyright © Cambridge University Press 1895

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References

page 292 note 1 Eozoonal structure of the ejected blocks of Monte Somma. By Prof.Johnston-Lavis, H. J., M.D., and Gregory, J. W., D.Sc. Trans. Roy. Dubl. Soc., ser. ii, vol. v, p. 259.Google ScholarSir J. W. Dawson's views are very fully stated in two sections of his work “Salient points in the Science of the Earth” (1893). [June 12. This paper was finished before a type-written copy of his paper, printed in the last Number ofthis Magazine (p. 271), reached me. To this I could not refer, because I did not know where, or in what form, it would be published.—T. G. B.]

page 293 note 1 Described brieflyin Presidential Address to the Geological Society, 1886, vol. xlii Proc., p.82.Google Scholar

page 293 note 2 Quart. Journ. Geol. Soc. (1883), vol. xxxix, p. 159.Google Scholar

page 293 note 3 This is a minimum. It may be much more. He gives it in places 1500 feet.

page 294 note 1 One of my specimens, taken as a sample of about the coarsest type, might be called a quartz-diorite; hornblende is abundant in crystals about a quarter of an inch in length.

page 294 note 2 The pyroxene is always light-colured, apparently either malacolite or a closely allied variety, but occasionally it might be tremolite (i.e. a variety of hornblende).

page 294 note 3 Some of my slices show that a little dolomite is present, but, so far as I can tell, calcite is the dominant mineral.

page 296 note 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.

page 296 note 2 The name of the owner was either Lavère or Laval; the farm was No. 10.

page 297 note 1 The specimen mentioned above as collected on Levine's Farm.

page 297 note 2 Quoted by Messrs. Johnston-Lavis and Gregory, loc. cit., p. 274.