Pseudoceratites of the Cretaceous (Volume 44) - Bookswagon
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Pseudoceratites of the Cretaceous (Volume 44)

Pseudoceratites of the Cretaceous (Volume 44)


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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1903. Not illustrated. Excerpt: ... persistent in the type specimen than in other fossils, and this may be a specific character, although the condition of other casts does not enable me to determine this. Locality: Presidio del Norte, Chihuahua, Mexico. Age: Probably same as guadahipce. Placenticeras Syrtale (Morton). Pl . XXVII, figs. 15-17; PI . XXVIII, figs. 1-6. Ammonites syrtalia Morton, 1834, Synop. Organic Remains, pi. 16. Morton's original specimen is probably a dwarf. At any rate, the shell is in its anagerontic substage, and the large nodes given in Morton's figure belong to this age. The diameter is 75 mm., and it is consequently smaller than the specimen of var. halei below described; nevertheless the gerontic stage has begun, as is shown by the great enlargement of the last pair of tubercles and the depression of the venter, and there is no living chamber. When this was present, the diameter was probably about the same as in the Alabama specimen. The tubercles appear earlier than in var. halei and are larger at the same age. A specimen from Fort Worth, which shows the typical characters oi the figure given by Morton, is 97 mm. in diameter. The outer volution is 42 mm. from line of involution to venter and the opposite is 31 mm. The large size of the umbilicus is due to the recession of the outer volution, which is in its metagerontic substage, and the shell consequently was almost wholly outgrown. It has the large inner nodes, and as these are not so numerous as the next outer row of smaller ones there is a distinct aspect of bifurcation in the fold-like costae that here and there connect them throughout the ephebic and gerontic stages. The venter has a narrow, concave zone bordered by elongated tubercles forming a crenulated border on either side in the ephebic stage. These are more ...


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Product Details
  • ISBN-13: 9781151300676
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 104
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1151300675
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 200 gr


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