Evdokimova I.O.

irina_evdokimova@vsegei.ru



Graduated from St. Petersburg State Mining Institute. G.V. Plekhanov (Technical University) (1993), "geological survey, prospecting and exploration of mineral deposits".
Senior Researcher of the All-Russian Research Geological Institute named after V.I. A.P. Karpinsky (FGBU "VSEGEI").
Area of scientific interests: paleontology (Silurian and Devonian ostracods), stratigraphy.
Author of over 30 works.
Stratigraphy and lithology
Article # 48_2022 submitted on 10/27/2022 displayed on website on 12/08/2022
28 p.
pdf Ostracods and conodonts of the Ustyarega Formation of the stratotype area (Lower Frasnian, Southern Timan)
New data on ostracods and conodonts and their stratigraphic distribution in the Ustyarega Formation of a stratotype area (Lower Frasnian, Southern Timan) are presented. The most stratigraphically significant taxa are representatives of the ostracod families Cavellinidae - Cavellina devoniana, Cavellina uchtaensis, Cavellina batalinae, Cavellina chvorostanensis, and Nodellidae - Nodella faceta, Nodella ex gr. hamata. The stratigraphic position of the studied section relative to the transgressive-regressive sedimentation succession is discussed. Its comparison with the cyclites of North America showed that the potential level of the lower boundary of the Frasnian Stage, respectively, the Upper Devonian, recorded near the base of the Ustyarega Formation, i.e. within the Upper Timan Sublevel. Above the boundary assumed by us, the first appearance of the ostracod Nodella ex gr. hamata and Cavellina batalinae is fixed.

Keywords: ostracods, conodonts, stratotype area, transgressive-regressive sedimentation, Lower Frasnian, Ustyarega Formation, Southern Timan.
article citation Sobolev D.B., Soboleva M.A., Evdokimova I.O. Ostrakody i konodonty ust'yaregskoy svity stratotipicheskoy mestnosti (nizhniy fran, Yuzhnyy Timan) [Ostracods and conodonts of the Ustyarega Formation of the stratotype area (Lower Frasnian, Southern Timan)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2022, vol. 17, no. 4, available at: http://www.ngtp.ru/rub/2022/48_2022.html
DOI https://doi.org/10.17353/2070-5379/48_2022
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