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The Fossil Plants of the Devonian and Upper Silurian Formations of Canada Volume 2

The Fossil Plants of the Devonian and Upper Silurian Formations of Canada Volume 2


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...series representing the Lower Devonian, the extreme abundance of Psilophyton and Arthrostigma, and the occurrence of Prototaxites as the only representatives of the Conifers, give an aspect of great antiquity to the flora. In the middle part of the same series we find these forms associated with Lepidodendron and Stigmaria and Lepidofloios; and at a corresponding horizon in New York and New Brunswick we find Ferns, Cordaites and other types not occurring, as far as known, in the lower beds. I shall present in the sequel some reasons for the belief that the middle of the Devonian is the true meetingplace of the last survivors of an old Silurian flora and the earlier representatives of the flora of the later half of the Palaeozoic. In the meantime I may refer for a moment to views of the sequence of Palaeozoic plants which might be entertained in accordance with theories of derivation of species now prevalent. The Lower Devonian, is distinguished by the abundance of some remarkable forms referred to Algae of the genera Spirophyton and Dictyophyton of Hall, also for the occurrence of vast quantities of humbly organized acrogens suited for a semi-aquatic habitat, as Psilophyton and Annularia. May not these two groups of plants be related in the way of derivation? Again, the synthetic types of acrogens of the Lower Devonian, and the prototypal exogens of the genus Prototaxites give way in the Middle Devonian to more perfect and specialized types of acrogens and gymnosperns; may they not have been advanced by a process of evolution? Such speculations have many charms for persons of vivid imagination, and may be supported by the analogy between the progress of the development of the individual plant and the succession of plants in geological time; but...


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Product Details
  • ISBN-13: 9781154996036
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1154996034
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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