Bulletin of the Washburn College Laboratory of Natural History Volume 2, Nos. 8-11

Bulletin of the Washburn College Laboratory of Natural History Volume 2, Nos. 8-11

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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. 1887 edition. Excerpt: ...the matrix of the layer have been converted into sub. crystalline calcite. Often the matrix becomes a ferruginous sand or clay, when the fossils become ill-preserved, often unrecognizable as such, their horizon then becoming a yellowish band. Even this is often lacking, as are indeed in some localities all evidence of fossils. In such places the entire Cretaceous series is usually much diminished. ' The fossils of No. 4 are in the upper half only, and are rare and, so far as seen, too poorly preserved for identification. ' Some of the fossils of No. 3 range up into Nos. 2 and 1, notably the large Gryphwa Pitcheri, but not in all localities. These three numbers represent two intergraduating paleontological horizons; the upper char-' acterized by the thin, compressed, oyster conglomerate plates, 'the lower by yellow-colored Cyp/rimeria crassa and Turritella-bearing layers. Thelatter has thus far yielded over twenty species of fossils, of which the following have been identified: Ostrea (4 spp. indet.); Ewogyra columbella Meek; Ewogyra fornicalata White (common); Gr;/phwa Pitcheri Mort. (large, common); Grg/phwa (?) Bryani Gabb; Neithea quinquecostata Sowerby; Cyprimeria crassa Meek, (large, attaining 3.25 in. in length, antero-posteriorly); Trigonia Emoryi, Con. (very rare); Acicula sp.; Mactra sp.; Lucina sp.; Our specimens have the equal secondary costae two in number. with a third and some times a fourth more or less developed on the flank of the primary costae. The wings show the folds characteristic of the sub genus Neitluaa. 'r In form, size, thickness, and dentition this shell closely resembles the C. crassa of No. 3. It has two to four of the outer zones of growth strongly irnbricated. or terraced. This feature occurs is...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236830644
  • 9781236830647