Cephalopoda of the Beekmantown and Chazy Formations of the Champlain Basin Volume 90
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Cephalopoda of the Beekmantown and Chazy Formations of the Champlain Basin Volume 90

Cephalopoda of the Beekmantown and Chazy Formations of the Champlain Basin Volume 90


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...section of the whorl and a dorsal siphuncle, as well as for the costated shells. These smooth shells have in the neanic stage decided costation with the same aspect and contour as in the adult of the genotype of Discoceras ( D. antiquissimum). But as Hyatt holds: "Similar species having costations throughout life can not be included in the same genus with those that have them only in the neanic and earlier stages of growth " and he adds that "the large number and great variety of form of these smooth species, while still maintaining this difference of the later stages of growth, shows that this separation indicates a natural distinction ." The species here described, would, as far as shown by material we have had opportunity to study, seem to be entirely smooth in all stages. Schroederoceras eatoni Whitfield (sp.) Plate 20, figure 3, 4: plate 23, figure 1 Lituites eatoni Whitfield. Am. Mus. Nat. Hist. Bul. 1886. v. I, no. 8, p. 331, pl. 28, fig. 5-7; pl. 32, fig. 1 Discoceras eatoni Schroder. Pal. Abhandl. von Dames & Kay ser. 1891. Bd. 5, Heft 4, p. 22. Schroederoceras eatoni Hyatt. Am. Phil. Soc. Proc. 1894. 32:470, pl. 6, fig. 28-35; pl-7, fig. 7-8 Our material of this small species from the west side of the Champiain basin is only fragmentary. Moreover, since the mature form has been fully described by Whitfield and the growth stages elaborately worked out and figured by Hyatt, it will suffice here to state that this type is present in the Valcour beds A3 and A3, though by no means very common there. We figure here transverse and longitudinal sections which will serve to show the slightly depressed character of the volutions, the propiodorsan position of the rather large siphuncle and the close arrangement of the quite concave se...


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Product Details
  • ISBN-13: 9781130332155
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 66
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130332152
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr


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