Reports Dealing with the Systematic Geology and Paleontology of Maryland Volume 5

Reports Dealing with the Systematic Geology and Paleontology of Maryland Volume 5

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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. 1913 edition. Excerpt: ...regularly dichotomous branching, and less crowded branches. On the obverse side the zocecial apertures are rounded, with peristome, and arranged in fairly regular diagonal rows, four or five in each row. Minute granules cover the peristomes and are arranged in regular series over the depressed intervening spaces. Larger nodes occasionally interspersed between the zocecial apertures. The reverse side is closely but distinctly striated longitudinally in young examples and at the growing ends of older specimens. Toward the basal part of the latter the striae are obscured and finally obliterated by nearly smooth secondary deposit. Occurrence.--Helderberg Formation, Keyser Member. Devil's Backbone. Collections.--Maryland Geological Survey, U. S. National Museum. Family RHABDOMESONTIDAE Genus ORTHOPORA Hall OllTHOPORA RHOMBIFERA (Hall)? Plate XLV, Figs. 12-14; Plate XLVIII, Fig. 6; Plate LI, Fig. 18 Trematopora rhombifera Hall, 1874, Twenty-sixth Ann. Kept. N. Y. State Mus., p. 103. 'Cf. Thamniscus? nysa Hall, 1883, Kept. State Geol. N. Y. for 1882, pi. xxil, figs. 31, 32, 47, 48. Also T. fruticella and T. varlolata of the same author, work, and plate, figs. 33-46. Trematopora rhombifera Hall, 1879, Thirty-second Ann. Kept. N. Y. State Mus., p. 152 (reprint, 1880, p. 14). Trematopora rhombifera Hall, 1883, Kept. State Geologist N. Y. for 1882-1883, pi. xl, figs. 15-20 (not pi. xxiv, figs. 3, 4). Trematopora (Orthopora) rhombifera Hall and Simpson, 1887, Nat. Hist. N. Y., Pal., vol. vl, p. 18, pi. xl, figs. 15, 17-20; pi. xxiil, figs. 11, 12 (not pi. xxv, fig. 29; pi. xxvl, figs. 3, 4). Description.---Zoarium ramose, apparently dividing at rather frequent intervals; branches.7 to 1.0 mm. in thickness. Zocecial apertures oval, set into rhomboidal or...
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Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123666101X
  • 9781236661012