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Published online by Cambridge University Press: 01 May 2009
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”
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