Abstracts of the Proceedings of the Ashmolean Society Volume 2-3

Abstracts of the Proceedings of the Ashmolean Society Volume 2-3

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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. 1854 edition. Excerpt: ...rag or grit, and, if so, they have probably been washed up from the Oxford clay. The thin beds of clay in the grit, at all events, do not seem to have been their habitat. The gryphaea, indeed, occurs only occasionally in the blue beds, but then the rarity of a fossil so characteristic of the Oxford clay may be accountedfor, since it most probably would not have been washed up with the pectens, ammonites, &c., both on account of its greater weight, and also because it seems to have lived on the surface of the mud, not to have moved on it or among its coral and weeds, as the pectens and trigonias may have done. One circumstance makes it probable that the echinidae were the inhabitants of the silicious sand in which they are found. The spines of an echinida are attached to its testa by a very thin membrane, which easily decays; and consequently dead echinidae are seldom found with spines attached. Nevertheless, I did find, on a heap of stones near Headington Hill, a cidaris in the blue stone with muricated spines attached. This specimen could not have been washed from any great distance. It probably dwelt in the silicious sand, and was buried in the mud before the waters could decay and remove its spines. Further evidence in support of the probability, that the silicious sand was the habitat of the echinidae, is given by the immense number of nucleolites semiglobusus (Goldfuss), both at Bullingdon and other spots, accompanied by few other fossils. In the midst of the cladocora bed there occurs an astraea, the habits of which may be advantageously studied on the surface of an old quarry, by the road side, between Bullingdon and Headington mill. It forms masses of various size, spreading horizontally, sometimes in plates not a quarter of...show more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236836529
  • 9781236836526