Abstract
The results of micropaleontological analysis of the boundary interval of the lower–middle Callovian in the TETs-5 section (Saratov) are presented. The taxonomic composition and distribution of foraminifera and ostracods in the section are studied. The ranges of the biostratigraphic units inferred from microfauna and their correlation with the ammonite scale are refined. Two foraminiferal zones of the East European Platform are established: Haplophragmoides infracalloviensis–Guttulina tatarensis and Lenticulina cultratiformis–Lenticulina pseudocrassa. The volume of the Lenticulina cultratiformis–Lenticulina pseudocrassa Zone ranges from the upper part of the lower Callovian (the upper part of the Koenigi Zone and the Calloviense Zone) to the middle Callovian. Two biostratigraphic units by ostracods are established: (1) the Acantocythere milanovskyi–Procytheridea cinicinnusa Zone corresponding to the Subpatruus Zone of the lower Callovian, to the lower part of the Ch. saratovensis biohorizon, and (2) Beds with Praeschuleridea wartae–Pleurocythere kurskensis corresponding to the terminal part of the Subpatruus Zone (the upper part of the Ch. saratovensis biohorizon), the Koenigi and Calloviense zones of the lower Callovian, and the lower part of the Jason Zone of the middle Callovian. The images of typical taxa are provided.
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ACKNOWLEDGMENTS
We are deeply grateful to V.V. Mitta (Paleontological Institute, Russian Academy of Sciences, Moscow) for organizing and conducting field work, to Ya.A. Shurupova (Moscow State University, Moscow) for washing samples taken from the section, to E.M. Tesakova and R.A. Rakitov (Paleontological Institute, Russian Academy of Sciences, Moscow) for constant help with the SEM operations, and to A.P. Ippolitov (Geological Institute, Russian Academy of Sciences, Moscow) for constructive comments that have improved this article.
Funding
This work was carried out within the framework of the themes of state assignment no. 0135-2019-0062 (Geological Institute, Russian Academy of Sciences) and no. AAAA-A16-116033010096-8 (Moscow State University) with partial support from the Russian Foundation for Basic Research no. 19-05-00130 and is a contribution to the project FNI no. 0331-2019- 0005.
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Translated by M. Hannibal
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Glinskikh, L.A., Tesakova, E.M. & Seltser, V.B. Biostratigraphy of the Lower–Middle Callovian of the Saratov Area (Volga Region) Inferred from Microfauna. Stratigr. Geol. Correl. 29 (Suppl 1), S57–S67 (2021). https://doi.org/10.1134/S0869593822020022
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DOI: https://doi.org/10.1134/S0869593822020022