Congressional Edition Volume 5301

Congressional Edition Volume 5301

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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. 1908 edition. Excerpt: ...favosas Goldfuss. Favosites cfr. niagarensis Hall or F. gothlanilicus Fought. "Collier, A. J., Prof. Paper U. S. Geol. Survey No. 2, M02, pp. 20 21. 22. Columnarist apparently closely related to Favistella reticulata Suiter of tlu Arctic Silurian. Halysites catcnularia feildeni Etheridge. Halysites catcnularia harti Etheridge. Diphyphylluin cfr. multicauHs (Hall). Alveolites sp. Gasteropoda, one a Lophospira, another a Iformotoma. Orthoccrun sp. undeterminable. Loc. 3AC170 (Harris Greek, about. miles north of Baldy Mountain, where No. 163 was collected in 1901). Cladopora sp.. resembles C. scriuta Hall of the New York Silurian: Striatopora sp.; Alveolites sp., a branching form. The species of these two localities indicate clearly the age of the limestones to be Niagaran or the middle third of the Silurian. This same horizon with the same species is known to occur in the Arctic region at Dobbin Bay, Cape Hilgard, Cape Louis Napoleon, Offley Island, etc. These two collections of Mr. Collier also shed light on his earlier collections, numbered 1AC45 and 1AC20. The former has an assemblage of species suggesting both the Ordovician and Silurian formations, and a similar occurrence was noted by Etheridge" for the Arctic localities mentioned above. Either there are two dolomitie superposed horizons in the far north, one of Ordovician age, the other of Silurian, causing the fossils of different ages to be mixed, or we have here indications that there was no break in the sedimentation between the Ordovician and Silurian permitting species usually accepted as restricted to the Ordovician to pass upward into the Silurian. Reference is here made to my former identification of Maclurina manitobensis. Etheridge also finds a similar shell...
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Product details

  • Paperback | 254 pages
  • 189 x 246 x 13mm | 458g
  • United States
  • English
  • black & white illustrations
  • 1236800095
  • 9781236800091