Lithology and biostratigraphy of the Frasnian and border section on the Kosyu River (Subpolar Urals)

Soboleva, M. A.; Sobolev, D. B.; Matveeva, N. A.

doi:10.17353/2070-5379/43_2018

Cited by 2 publications

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“…The conodont association of with Polygnathus ljaschenkoi compares well with the complex of Beds with Polygnathus pollocki -Polygnathus ljaschenkoi, identified in the Kosyu River section on the western slope of the Subpolar Urals [22]. The joint appearance of the conodonts Polygnathus pollocki M1 Druce and Polygnathus ljaschenkoi is noted significantly below the first appearance of Ancyrodella soluta [22]. The Polygnathus pollocki is also defined in the section of the Yba Formation, but above the first appearance of Polygnathus ljaschenkoi.…”

Section: Sherasupporting

confidence: 68%

“…Such a sequence reflects their appearance in the new scheme of the conodont zonation [1,3]. The first appearance of the conodonts Ancyrodella rotundiloba soluta established by the authors in the sections of the western slope of the Subpolar Urals (Kozhym River and Kosyu River sections) in the interval of the upper subformation of the Kedzydshor Formation [22][23].…”

Section: Sheramentioning

confidence: 99%

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Conodonts and ostracodes from the Givetian-Frasnian shallow-water deposits of the Southern Timan

Soboleva¹,

Sobolev²

2019

Vestnik IG KomiSC

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Conodont and ostracode distribution in the Timan (Middle -Upper Devonian, Upper Givetian -Lower Frasnian), Ust'-Yarega (Upper Devonian, Lower Frasnian) and Yba (Middle? -Upper Devonian, Upper Givetian? -Lower Frasnian) formations of Southern Timan was analyzed. The regional and interregional correlation of the established associations was conducted. The significant changes in conodont and ostracode associations are observed almost at the base of the Ust'-Yarega Formation, and they are associated with a gradual increase in the depth of the paleobasin. The conodonts of Ancyrodella rugosa and Mesotaxis asymmetricus appearing at this level characterize the Ancyrodella rugosa conodont Zone. The ostracodes of the Ust'-Yarega Formation are represented by the assemblage of the Cavellina chvorostanensis -Entomozoe (R.) scabrosa Zone. The significant changes in the conodont associations of the Yba Formation reflect an important sequence of appearance of the index-species: Mesotaxis falsiovalis, Ancyrodella rotundiloba soluta, Ancyrodella rotundiloba rotundiloba. The Ancyrodella soluta conodont Zone provide a reliable correlation of the sections of the Timan-North Urals Region and are essential for resolving the issue of the lower boundary of the Frasnian stage of the Upper Devonian in the East European Platform. Èíñòèòóò ãåîëîãèè ÔÈÖ Êîìè ÍÖ ÓðÎ ÐÀÍ, ÑûêòûâêàðÏðîâåäåí àíàëèç ðàñïðîñòðàíåíèÿ êîíîäîíòîâ è îñòðàêîä â ðàçðåçàõ òèìàíñêîé (ñðåäíèé -âåðõíèé äåâîí, âåðõíèé aeèâåò -íèaeíèé ôðàí), óñòü-ÿðåãñêîé (âåðõíèé äåâîí, íèaeíèé ôðàí) è ûáñêîé (ñðåäíèé? -âåðõíèé äåâîí, âåðõíèé aeèâåò? -íèaeíèé ôðàí) ñâèò Þaeíîãî Òèìàíà. Îñóùåñòâëåíû ðåãèîíàëüíàÿ è ìåaeðåãèîíàëüíàÿ êîððåëÿöèè óñòàíîâëåííûõ êîìïëåêñîâ. Çàìåòíûå èçìåíåíèÿ â êîíîäîíòîâûõ è îñòðàêîäîâûõ êîìïëåêñàõ îòìå÷àþòñÿ ïðàêòè÷åñêè ñ îñíîâàíèÿ óñòü-ÿðåãñêîé ñâèòû è ñâÿçàíû ñ ïîñòåïåííûì óâåëè÷åíèåì ãëóáèíû ìîðñêîãî áàññåéíà. Íà ýòîì óðîâíå ïîÿâëÿþòñÿ êîíîäîíòû Ancyrodella rugosa è Mesotaxis asymmetricus, êîòîðûå õàðàêòåðèçóþò çîíó Ancyrodella rugosa. Îñòðàêîäû óñòü-ÿðåãñêîé ñâèòû ïðåäñòàâëåíû êîìïëåêñîì çîíû Cavellina chvorostanensis -Entomozoe (R.) scabrosa. Â òî aeå âðåìÿ çàìåòíûå èçìåíåíèÿ â êîíîäîíòîâûõ êîìïëåêñàõ ûáñêîé ñâèòû îòðàaeàþò âàaeíóþ ïîñëåäîâàòåëüíîñòü ïîÿâëåíèÿ çîíàëüíûõ âèäîâ: Mesotaxis falsiovalis, Ancyrodella rotundiloba soluta, Ancyrodella rotundiloba rotundiloba. Êîíîäîíòîâàÿ çîíà Ancyrodella soluta îáåñïå÷èâàåò íàäåaeíóþ êîððåëÿöèþ ðàçðåçîâ Òèìàíî-Ñåâåðîóðàëüñêîãî ðåãèîíà è èìååò ñóùåñòâåííîå çíà÷åíèå äëÿ ðàçðåøåíèÿ âîïðîñà î íèaeíåé ãðàíèöå ôðàíñêîãî ÿðóñà âåðõíåãî äåâîíà íà òåððèòîðèè Âîñòî÷íî-Åâðîïåéñêîé ïëàòôîðìû.Êëþ÷åâûå ñëîâà: êîíîäîíòû, îñòðàêîäû, áèîñòðàòèãðàôèÿ, êîððåëÿöèÿ, Þaeíûé Òèìàí, aeèâåòñêî-ôðàíñêèé ïî-ãðàíè÷íûé èíòåðâàë. mation, and the highest position coincides with the base of the Ust'-Yarega Formation or the upper part of the Kedzydshor Formation [2, 25], characterized by the late forms of the conodonts Ancyrodella rotundiloba (Bryant). In addition, in sections of the Timan-Pechora Province (TPP), it is proposed to draw the boundar...

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Section: Sherasupporting

confidence: 68%

Section: Sheramentioning

confidence: 99%

Conodonts and ostracodes from the Givetian-Frasnian shallow-water deposits of the Southern Timan

Soboleva¹,

Sobolev²

2019

Vestnik IG KomiSC

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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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Lithology and biostratigraphy of the Frasnian and border section on the Kosyu River (Subpolar Urals)

Cited by 2 publications

References 0 publications

Conodonts and ostracodes from the Givetian-Frasnian shallow-water deposits of the Southern Timan

Conodonts and ostracodes from the Givetian-Frasnian shallow-water deposits of the Southern Timan

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

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