Ostracods and Conodonts of the Ustyarega Formation of the Stratotype Area (Lower Frasnian, Southern Timan)

Sobolev, D. B.; Soboleva, M. A.; Evdokimova, I O

doi:10.17353/2070-5379/48_2022

Cited by 6 publications

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“…L -Lower, U -Upper, FZ -Frasnian Zone. The correlation is based on the following materials: Ukhta anticline, the Ukhta River sections (Sobolev et al, 2021(Sobolev et al, , 2022; Djejimparma uplift, Shera Creek section (Soboleva, Sobolev, 2017; Sharyu region, the Izyayu River section, presented in this work and the Izyayol River section (partially published (Soboleva, 2018); Kozhim region, the Kozhim River section (Soboleva, 2017;Soboleva et al, 2018a) and the Kosyu River section (Soboleva et al, 2018b); Tolyinsko-Balbanyusky region, eastern sequence type of of the B. Nadota River area (Gruzdev et al, 2016;Soboleva, 2022). A hiatus in the Ust-Yarega Formation within the FZ2 conodont zone is shown (Sobolev et al, 2021(Sobolev et al, , 2022 На территории Южного Тимана расположены стратотипические разрезы тиманской и устьярегской свит (Ухтинская антиклиналь), а также ыбская свита (Джеджимпарминский вал).…”

Section: корреляция с местными стратиграфическими подразделениями тим...mentioning

confidence: 99%

Kedzydshor Formation and conodonts of the Lower Frasnian on the Izyayu River (South of the Tchernyshev Uplift)

Soboleva

Журавлев

2023

Lithosphere

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Research subject. Conodonts of the Lower Frasnian Kedzydshor Formation of the southern part of the Tchernyshev Uplift. Materials and methods. Materials obtained during a study of the section of the Kedzydshor Formation located on the Izyayu River were used. The biostratigraphic subdivision of the section was based on taxonomic definitions of conodonts and correlations with the Standard and Frasnian conodont zones. Results. In comparison with the stratotype of the Kedzydshor Formation, carbonate-argillaceous deposits cropping out on the Izyayu River are represented by fragments of the middle and upper parts of the Kedzydshor Formation in the stratigraphic range of the Lower falsiovalis Zone of the standard conodont zonation of the Lower Frasnian. The predominantly carbonate interval of the section is conventionally correlated with the FZ1 conodont zone, while the overlying terrigenous interval – with FZ2. The polygnatid and polygnatid-ancyrodellid conodont biofacies dominate in the section under study. Conclusions. New data on the distribution of cono donts across the Kedzydshor Formation in the Izyayu River section were obtained. The obtained data were compared with the local stratigraphic units of the Timan-North Urals Region. The Kedzydshor Formation is one of the most complete sequences of the Middle-Upper Devonian transition, thus representing the basis for searching and substantiating the position of the debatable lower boundary of the Frasnian Stage of the Upper Devonian.

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Section: корреляция с местными стратиграфическими подразделениями тим...mentioning

confidence: 99%

Kedzydshor Formation and conodonts of the Lower Frasnian on the Izyayu River (South of the Tchernyshev Uplift)

Soboleva

Журавлев

2023

Lithosphere

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“…Distribution intervals of ostracods in the Timan-North Urals region: 1 -Southern Timan, Ukhta anticline, 1-Balneological borehole (Reference sections…, 1988(Reference sections…, , 1997N.A. Fokin, stock materials); 2 -Southern Timan, Ukhta anticline, Ukhta River sections (materials of the authors; Reference sections…, 1988Reference sections…, , 1997Orlov, Fokin, 1991;Sobolev et al, 2022); 3 -Chernyshev uplift, Sharyu River section (Orlov, Fokin 1991;Orlov, 1993); 4 -Main Devonian field ; 5 -Timan-Pechora province boreholes (N.A. Fokin, stock materials); 6 -Southern Timan, Djejimparma uplift, Shera Creek section (materials of the authors, partially published in the works (Telnova et al, 2019;)); 7 -Chernyshev uplift, Bol'shoy Adak River section (Orlov, 1993) На основании установленных нами циклов в тиманской и устьярегской свитах Южного Тимана построена кривая относительного изменения уровня моря (рис.…”

Section: материал и методы исследованийmentioning

confidence: 99%

Ostracod zonation of the Givetian-Frasnian boundary interval in the Timan-North Urals Region

2023

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Research subject. Ostracods and Givetian-Frasnian boundary deposits of the Timan-North Urals Region.Materials and methods. The work was based on the results of studying ostracods from the stratotype sections of the Southern Timan, which are considered referential for regional and global correlations. The analysis of the distribution intervals of the most significant taxa was based on the results of previous studies, both published and archival materials on the Timan-Urals Region. Ostracods were considered in association with conodonts, which is an important criterion for applying a reasonable biostratigraphic subdivision. The use of different-scale regional cyclicity of sedimentation and individual “marking” levels of manifestation of global events were shown.Results. The ostracod distribution in the Givetian-Frasnian boundary interval of the Timan-Northern Urals region was analyzed. The following most significant taxa were identified: Cavellina devoniana, Cavellina uchtensis, Cavellina batalinae, Cavellina chvorostanensis, Nodella faceta, Nodella ex gr. hamata. The correlation of established assemblages with ostracods from the Franco-Belgian basin was shown. The difference consists in the absence of a polyzygid assemblage with Polyzygia beckmanni beckmanni, which was established at the base of the Nismes Formation of Belgium near the historical boundary between the Givetian and Frasnian stages. The determined relationship of biostratigraphic data in combination with the transgressive-regressive sequence of sedimentation shows a more reasonable solution to the problem of the position of the lower boundary of the Frasnian stage of the Upper Devonian in the Timan-Northern Urals Region.Conclusions. An updated version of the scheme of zonal subdivision of the Givetian-Franian boundary interval in the Timan- Northern Urals region has been developed, taking into account the ostracod distribution of the Cavellinidae and Nodellidae families, as well as the discrepancies in the levels of the first appearance of index species and the boundaries of zones in the regional stratigraphic scheme. The correlation of ostracod zones relative to the conodont scale is shown.

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Morphological Features of Conodonts of the Genus Icriodus from the Ust’-Yarega Formation (Frasnian, Upper Devonian) of the Southern Timan, Russia

Soboleva,

Nazarova

2024

Paleontol. J.

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Ostracods and Conodonts of the Ustyarega Formation of the Stratotype Area (Lower Frasnian, Southern Timan)

Cited by 6 publications

References 0 publications

Kedzydshor Formation and conodonts of the Lower Frasnian on the Izyayu River (South of the Tchernyshev Uplift)

Kedzydshor Formation and conodonts of the Lower Frasnian on the Izyayu River (South of the Tchernyshev Uplift)

Ostracod zonation of the Givetian-Frasnian boundary interval in the Timan-North Urals Region

Morphological Features of Conodonts of the Genus Icriodus from the Ust’-Yarega Formation (Frasnian, Upper Devonian) of the Southern Timan, Russia

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