The Russian Carboniferous and Permian compared with those of India and America : a review and discussion / by Charles Schuchert.
- Charles Schuchert
- Date:
- 1906
Licence: In copyright
Credit: The Russian Carboniferous and Permian compared with those of India and America : a review and discussion / by Charles Schuchert. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![Rhipidomella, Enteletes, Derbya, Meekella, Seviinula, and Hustedia. On the other hand, this arctic fauna predominates in Productus and Spb'ifer. Of the former genus the species are nearly all strangers to American paleontologists, since the bilobed or deeply sinused and the abundantly spinose forms are the common ones. The Spirifers also are strange in that hardly any have the plications strongly bundled as in S. cam- eratus, while such little known groups as that represented by S. arcticus and S. supramosquensis (also recalling S. neyleetus of the Lower Carboniferous) predominate. “ Ten or more species of Bryozoa are present, of Fenestella, Pinnatopora, Goniocladia, and Rhombopora. None, how- ever, can be specifically identified and those of the genus Rlionibopora are of a type—stout branches from ^ to f inch in diameter—unknown in the Mississippi basin. This is also true of Goniocladia. Pelecypoda are all small and rare (5 species), and the Gasteropoda (3 species, 4 specimens) almost absent. Not a trace of a cephalopod is present, and this is all the more strange since the Indian Permian has 14 forms of nautiloids and 7 of ammonoids. Nor is there a trace of a trilobite, while the corals are represented by one or two species of cvathophylloids. “The work of the United States Geological Survey in Cali- fornia and Alaska is establishing two facts of great value in general geology, namely, that on the west coast of North America there is (1) a great thickness and grand sequence of Carboniferous and Permian strata [between 6000-7000 feet of Permian in Copper River region of Alaska] ; (2) that these have faunae of the Pacific type and not of that of the Missis- sippi basin ” (p. 44). Conclusions. As the great Russian geologist has stated in his introduction that he will be the first to greet friendly criticism “ with pleas- ure,” the present reviewer takes the opportunity of concluding this long review with the following friendly remarks :— 1. The foregoing review of the recent work of four excel- lent investigators in the correlation of Carboniferous and Per- mian strata and faunas shows clearly that a final interpretation of the secpience of events closing the Paleozoic is still far from attainment. Further, that while harmony exists regarding the basal zone of the Carboniferous (Upper Carboniferous of most writers), there is as yet no agreement as to the upper limits of this system of rocks and hardly any concerning the delimita- tion and sequence of the Permian. As has been seen, there is little or no difference of opinion in regard to the sequence of](https://iiif.wellcomecollection.org/image/b22407194_0035.jp2/full/800%2C/0/default.jpg)
