A Text-Book of Geology; For Use in Universities, Colleges, Schools of Science, Etc., and for the General Reader Volume 2

A Text-Book of Geology; For Use in Universities, Colleges, Schools of Science, Etc., and for the General Reader 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. 1915 edition. Excerpt: ...life. First we shall trace the rise of the land vegetation and forests, and then take up a further study of the Devonian fresh-water fishes described in the two previous chapters. How, where, and why lungs were developed we shall see by following their history from the gilled and worm-like invertebrates of the sea through the halfvertebrates into the fishes with both gills and lungs, the double breathers, as typified by the lung-fishes of the Devonian. Continental Deposits Oldest Fossiliferous Strata.--On page 258 the physical characters of continental deposits and their origin are stated, and now we come to the study of the organic record of such deposits. The oldest of these strata with fossils are of Devonian time. There are, it is true, undoubted continental deposits as early as the Proterozoic, but they are devoid of fossils. From the Devonian period onward, the geologic record often bears testimony to the continental origin of certain deposits and their entombed life, and while such are preserved and accessible more and more as one goes upward in the geologic scale, still the record of the land-living and airbreathing plants and animals is far more imperfect than the record of marine life. This is due to the fact that the organisms of the land are rarely entombed in the sands and muds of the land waters, but are either eaten by their living contemporaries, or oxidized and blown away by the atmosphere. The life of the fresh waters is more apt to be preserved, along with such land-dwelling organisms as may be accidentally drowned or blown into them (leaves), or washed by the floods into the areas of standing waters where burial may take place. Even though burial occurs on land, however, the circulation of ground waters is far more marked in...
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Product details

  • Paperback | 216 pages
  • 189 x 246 x 12mm | 395g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236585496
  • 9781236585493