Report of the State Geologist Volume 4-6

Report of the State Geologist Volume 4-6

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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. 1885 edition. Excerpt:, e upper bead at its contact with the septum. Fig. 5. Id. A septum showing the position of the siphuncle, and exhibiting the effects of a slight compression of the tube. Chemung group, near Panama, Chautauqua county, AT. Y. Orthoceras Daedalus, W. sp. Fig. 6. A longitudinal section of three air-chambers, showing the small passage made by the siphuncle through the septa, and the reflection of the margin indicating a moniliform siphuncle. Fig. 7. A fragment showing the enlargement of the tube, and depth of the air-chambers. Fig. 8. The chambers of habitation showing its extent, and a broad constriction near the aperture. Fig. 9. Id. The last septum showing the position of the siphuncle. Fig. 10. A fragment showing the characters of the organic deposit on the walls of the air-chambers and septa. Oonuitite limestone, Rockford, Ind. Orthoceras Icarius, n. sp. Fig. 11. The chamber of habitation with four attached air-chambers, showing the form of the tube and the depth of the chambers. Fig. 12. Id. Septum showing the position of the siphuncle, and the circular transverse section of the tube. Fig. 13. Longitudinal section of a chambered fragment showing the passage for the siphuncle through the septa. Fig. 14. An enlargement to two diameters of the internal mould of a small imperfect specimen, to show the concave walls of the air-chambers from the solution of an organic deposit, and a line of nodes indicating the ventral side of the tube. Fig. 15. A septum of another individual enlarged two diameters, showing an elevated areola with a furrowed margin surrounding the siphuncle, 'produced by the solution of the organic deposit on the septum. Qoniatite limestone, Rockford, Ind. PLATE (CXIX)Z. GOMPHOCERAS MITItA, Hall. An internal mould of a large nearly...
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Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236559398
  • 9781236559395