Palaeontographical Society, Vol. 41

Palaeontographical Society, Vol. 41 : Issued for 1887 (Classic Reprint)

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Excerpt from Palaeontographical Society, Vol. 41: Issued for 1887 UP to a comparatively recent period so few genuine fossil Sponges were known from the older stratified rocks of the British area, that it would have been super fluous to devote a separate portion of a Monograph especially to their consideration. Even now the number of species is very limited in comparison with those from the Mesozoic strata, and their state of preservation is very unfavorable; but recent discoveries show that Sponges as a group flourished to such an extent in certain epochs of the Palaeozoic era as to form by their remains massive beds of rock of considerable thickness, and, measured by this scale, they were then more numerous than at any subsequent geological period. In view of this enormous development of Sponge-life, it is reasonable to suppose that the small number of species known hitherto falls far short of those which then existed. In no group of organisms with structures capable of preservation have the influences of fossilisation acted with more destructive effect than upon fossil Sponges; at all events, on those in the Palaeozoic rocks; for thick beds occur built up almost exclusively of their remains, and yet not a single entire individual has been preserved in them! Their elaborate skeletal tissues have been altogether disintegrated, and only their minute, microscopical, spicular elements, heterogeneously mingled and cemented together into hard rock, remain for examination. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical more

Product details

  • Paperback | 448 pages
  • 152 x 229 x 23mm | 594g
  • Forgotten Books
  • United States
  • English
  • , black & white illustrations
  • 0243161107
  • 9780243161102