Asselian and Sakmarian (Lower Permian) Radiolarian Ecozones of the South Urals (Russia)

A study of Lower Permian radiolarians from the Kondurovka and Verkhneozernoe sections, located on the right bank of the Sakmara and Ural rivers on the western slope of the South Urals, was carried out. Analysis of the distribution of 104 species of radiolarians in the study area made it possible to...

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Bibliographic Details
Published in:Paleontological journal 2021-12, Vol.55 (8), p.825-862
Main Author: Afanasieva, M. S.
Format: Article
Language:English
Subjects:
Distribution
Distribution patterns
Earth and Environmental Science
Earth Sciences
Genera
Geographical distribution
Indigenous species
Paleontology
Permian
Radiolaria
Rivers
Species
Taxonomic revision
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Summary:A study of Lower Permian radiolarians from the Kondurovka and Verkhneozernoe sections, located on the right bank of the Sakmara and Ural rivers on the western slope of the South Urals, was carried out. Analysis of the distribution of 104 species of radiolarians in the study area made it possible to establish three successive ecozones in the Kondurovka section: (1) Asselian Tetragregnon sphaericus-Latentifistula heteroextrema corresponding to the Streptognathodus postfusus–St. barskovi conodont zone , (2) Sakmarian Arcoclathrata alekseevi–Apophysisphaera sakmaraensis , and (3) Sakmarian Holdsworthella perforata–Helioentactinia ikka corresponding to the Sweetognathus merrilli and Sweetognathus binodosus conodont zones, respectively. The Kozurispongus permicus ecozone was recognized in the Verkhneozernoe section where it corresponds to the Sweetognathus binodosus conodont zone. The taxonomic position of 30 species from 12 genera identified by Kozur (1980, 1981) and Kozur and Mostler (1989) has been revised, which currently belong to 19 genera from four classes of radiolarians. The distribution patterns of Lower Permian radiolarians in the Kondurovka and Verkhneozernoe sections of the South Urals are analyzed. Special attention is paid to indigenous and migrant species.
ISSN:0031-0301
1555-6174
DOI:10.1134/S0031030121080025