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III.—On some Life Zones in the Lower Palæozoic Rocks of the British Areas, as defined mainly by Researches during the Past 30 Years

Published online by Cambridge University Press:  01 May 2009

Henry Hicks
Henry Hicks
Affiliation:
Lower Cambrian
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Extract

Up to the year 1867 the only traces of organisms that had been found in the beds then classed as Cambrian by the Geological Survey (now Lower and part of Middle Cambrian of most authors) were tracks and burrows of Annelids; and the doubtful Trilobite Palæopyge found by Mr. Salterinthe Longmynd rocks of Shropshire.in“Siluria”, fourth edition, 1867, p. 30, Sir R. Murchison refers to them as follows: “These, then, are the only signs of former life we have yet become acquainted with after the most assiduous researches in the Cambrian deposits of such vast dimensions, which are often, I repeat, less altered than much younger rocks replete with organic remains”

Type
Original Articles
Information
Geological Magazine , Volume 1 , Issue 9 , September 1894 , pp. 399 - 405
Copyright
Copyright © Cambridge University Press 1894

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References

page 399 note 1 Quart. Journ. Geol. Soc. vol. xii. (1856), and vol. xiv. p. 199.Google Scholar

page 399 note 2 Ibid. vol. xxiii. p. 339.

page 400 note 1 Survey Memoirs, vol. iii. second edition, p. 8.Google Scholar

page 400 note 2 “Descriptions of Kew Species of Fossils from the Longmynd Rocks of St. David's”.

page 401 note 1 “The Classification of the Eozoic and Lower Palæozoic Rocks of the British Isles”, Popular Science Beview, 1881, and Proc. Geol. Assoc. vol. viii. No. 5, 1881.Google Scholar

page 401 note 2 Q.J.G.S., vol. xliv. p. 74.Google Scholar

page 402 note 1 Quart. Journ. Geol. Soc. vol. xxxi. p. 552.Google Scholar

page 402 note 2 “Some Considerations on the Probable Conditions under which the Palæozoic Rocks were Deposited over the Northern Hemisphere”. GEOL. MAG. Dec. II. Vol. III. (04, May, and June, 1870).Google Scholar

page 403 note 1 Mr. C. Walcott has recently worked out with much care the evidences of the early conditions prevailing during the same periods on the American continent (“The Fauna of the Lower Cambrian or Olenellus Zone”, 1890, and “Bulletin of the United States Geological Survey”, No. 81, 1891).

page 403 note 2 See “Pre-Cambrian Volcanoes and Glaciers”, GEOL. MAG. Dec. II. Vol. VII. (11, 1880).Google Scholar

page 403 note 3 GEOL. MAG. Dec. III. Vol. IX. p. 22.Google Scholar

page 404 note 1 GEOL. HAG. Dec. III. Vol. V. p. 485, and “Nature”, vol. xxix. p. 213.Google Scholar