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The Problematic Fossil Mobergella radiolata as an Index Species of the Lower Cambrian Stages

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Abstract—

The biostratigraphy of the lower boundaries of the Atdabanian Stage of the General Stratigraphic Scale of Russia and Stage 3 of the International Chronostratigraphic Chart is discussed. It is generally accepted that the first appearance of trilobites is the main characteristic of these stages. The difficulties in selecting the correlation level for the lower boundary of Stage 3 on the basis of trilobites are explained by the different taxonomic compositions of the assemblages of the most ancient representatives of this arthropod group on different paleocontinents and evident diachronism of the levels of their first appearance. For these purposes, it is proposed to use the species Mobergella radiolata Bengtson, 1968, the geographical distribution of which is wider than that of any species of ancient trilobites. It was shown that in the stratotype region of the Lower Cambrian stages in the Siberian Platform (the interfluve between the Lena and Aldan rivers), M. radiolata appears in sections at the same level as the first Atdabanian archaeocyaths of the Retecoscinus zegebarti Zone. This allows M. radiolata to be used as an index species for the base of the Atdabanian. Finds of M. radiolata in other regions of the Siberian Platform (west, north, and southeast, interior areas of the platform) make this microfossil an extremely valuable tool for biostratigraphy of the Lower Cambrian, with a much higher correlation potential than locally common early Atdabanian archaeocyaths or trilobites.

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Notes

  1. Further in the text, the abbreviated name of the zones is used: P. jakutensis and R. zegebarti, respectively.

  2. Further in the text, the abbreviated names of the Tommotian zones are used: N. sunnaginicus, D. regularis, and D. lenaicus, respectively.

  3. Here the following species continuing from the Tommotian Stage were identified: Archaeolynthus polaris (Vologdin), Cryptoporocyathus junicanensis Zhuravleva, Nochoroicyathus tkatschenkoi (Vologdin), N. mutabilis (Voronin), N. belvederi (Rozanov), N. simplex (Vologdin), Robustocyathus robustus (Vologdin), Erismacoscinusrojkovi (Vologdin), Retecoscinus retetabulae (Vologdin), Dictyocyathus translucidus Zhuravleva, and Okulitchicyathusdisciformis (Zhuravleva), along with typical Atdabanian forms, i.e., Retecoscinus zegebarti Korshunov and N. dissipimentalis Zhuravleva.

  4. The thickness of beds and members in the Ulakhan-Aldyarkhay Section is cited differently by various authors (e.g., Bushuev et al., 2014; Repina et al., 1974). Here we follow the description of the Kharaulakh sections by Repina et al. (1974). The measured position of new trilobite finds in the Ulakhan-Aldyarkhay Section is recalculated according to Bushuev et al. (2014, text-fig. 3).

  5. The record of R. insolutum in the uppermost Tommotian D. lenaicus Zone comes from the upper portion of Bed 14 of the Isit Section in the middle reaches of the Lena River. This particular bed should be entirely assigned to the lowermost Atdabanian, judging from the finds of the archaeocyath assemblage of the R. zegebarti Zone in its basal horizons (Skorlotova, 2013).

  6. Unfortunately, none of the cited publications contains the image of the found Mobergella and, therefore, the species belonging to this form is not quite clear.

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Funding

This work was supported by the Russian Foundation for Basic Research, project nos. 16-05-00651 and 19-04-01027.

Reviewers A.Yu. Zhuravlev, I.V. Korovnikov, and M.A. Fedonkin

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  1. Borissiak Paleontological Institute, Russian Academy of Sciences, 117647, Moscow, Russia

    P. Yu. Parkhaev, Yu. E. Demidenko & M. A. Kulsha

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Parkhaev, P.Y., Demidenko, Y.E. & Kulsha, M.A. The Problematic Fossil Mobergella radiolata as an Index Species of the Lower Cambrian Stages. Stratigr. Geol. Correl. 28, 135–156 (2020). https://doi.org/10.1134/S0869593820020057

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