Transactions of the Geological Society of Glasgow Volume 3, Nos. 1-2

Transactions of the Geological Society of Glasgow Volume 3, Nos. 1-2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 edition. Excerpt: ... than above it. In assuming the existing rate therefore as an average from which to speculate upon past changes, I do not think that we shall be likely to exaggerate the results. When we calmly look at what the various denuding forces are now doing, and when we try to gain a vivid idea of the loss of land by measuring the amount of material which is annually removed from land-surfaces, we cannot but be struck, I think, by the unexpected rapidity of the process. Denudation is commonly appealed to as one of the geological phenomena, which, as measured by results, best attest the enormous duration of geological periods. And this conclusion is based upon the idea that the present rate of denudation is inconceivably slow. Yet, as we have seen in the previous pages, the rate of waste actually in progress would in a few millions of years suffice for the washing away of all the solid land on the face of the globe. The proportions already given for the rate of waste among the different agents of denudation and in different areas of the globe, may be modified, but the general result will doubtless remain, that modern denudation is in reality a far more gigantic and rapid process than we have been apt to believe, and that our demands for enormous periods, in so far as based upon the evidence of past denudation, are unnecessary. Denudation and deposition are phenomena inseparably connected; the one is the counterpart of the other. If, therefore, all evidence from living nature goes to show that geologists have been in error in requiring too vast a time for the removal of large masses of solid rock, the same evidence suffices to indicate, that they must be equally wrong in demanding enormous periods for the accumulation into stratified rocks of more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • United States
  • English
  • black & white illustrations
  • 1236973895
  • 9781236973894