The Carboniferous-Permian Boundary in the Former Ussr and its Correlation Article

Davydov, VI, Barskov, IS, Bogoslovskaya, MF et al. (1992). The Carboniferous-Permian Boundary in the Former Ussr and its Correlation . INTERNATIONAL GEOLOGY REVIEW, 34(9), 889-906. 10.1080/00206819209465643

cited authors

  • Davydov, VI; Barskov, IS; Bogoslovskaya, MF; Leven, EY; Popov, AV; Akhmetshina, LZ; Kozitskaya, RI

abstract

  • At present, the Carboniferous-Permian boundary in the USSR is officially established on the goniatite scale at the change from the Orenburgian ammonoid assemblage to the Asselian. This corresponds to the boundary between the Shumardites-Vidrioceras and Svetlanoceras-Juresanites genozones. The boundary between the Daixina bosbytauensis-D. robusta and Sphaeroschwagerina vulgaris-S. fusiformis zones in the fusulinid scale corresponds to this horizon of the goniatite scale. With regard to conodonts, the position of the boundary is not quite clear; S. flangulatus and S. asselicus apparently coincide with this level, whereas S. cristellaris, S. constrictus, and S. barskovi first appear somewhat above the boundary. The boundary stratotype was set at the base of bed 20 of the Aidaralash section, a horizon of monofacial carbonate-clastic sediment, at the level of the phylogenetic line of the ammonoids Artinskia irinae-A.kazakhstanica. The base of the Sphaeroschwagerina vulgaris-S. fusiformis zone is 12 m lower. The section is characterized by ammonoids, fusulinids, conodonts, and miospores in the Gzhelian-Sakmarian. Paleomagnetic characteristics have been examined. The accepted position of the boundary in the Aidaralash section was first established by V. E. Ruzhenzev, the author of the Asselian stage. The legitimate boundary possesses significant correlation potential. In North America, the top of the Gaptank Formation and the base of the Bersum Formation, as well as their analogues, can be traced by goniatites and conodonts. In a number of thoroughly studied sections in the Tethys area, the boundary is diagnosed through fusulinids and conodonts. Paleomagnetic data make it possible to trace the boundary in continental and barren volcanic formations. It should be noted that the Stephanian and Autunian boundary of the standard scale in the continental deposits in Western Europe is lower than the accepted level and coincides with the base of the Daixina bosbytauensis-D. robusta zone of the fusulinid sale. © 1992 Taylor & Francis Group, LLC.

publication date

  • January 1, 1992

published in

Digital Object Identifier (DOI)

start page

  • 889

end page

  • 906

volume

  • 34

issue

  • 9