Geologicheskii Vestnik

The results of the study of distribution of foraminifers in the Mechetlino section, a potential candidate for the stratotype of the lower boundary of the Kungurian stage of the Cisuralian Series (Lower Permian) are presented. 20 samples were selected in 2015–2016 years. Specific complexes of fusulinides and smaller foraminifers were obtained at 17 levels of the section. Foraminifers were found only on three levels before these studies. The most representative complex of fusulinides is determined from the lower part of the section in layers 3–6. This assemblage is characteristic for the Sargian horizon of the Urals. The morphologically similar group of Pseudofusulina urasbajevi and Uralofusulinella arkaulensis group are located in this interval of the section. The single shells of fusulinides or fragment of shells are found in the layers 8, 10, 14 and 15. Smaller foraminifers are found on 17 levels and are represented by 59 species of 22 genera. The first foraminiferal complex belong to the Sargian horizon, the second — to the Saranian, the third has a more general Kungurian image. Markers of the Saranian horizon of the Kungurian among smaller foraminifers are determined above the assumed boundary. It is shown that the stratigraphic potential of foraminifers makes it possible to use this group of microfauna for a detailed subdivision of the Mechetlino section and interregional correlation of deposits.

Permian system, Kungurian stage, International Stratigraphic Scale, fusulinides, smaller foraminifers

• Boiko M.S. Ammonoidei iz artinsko-kungurskikh otlozeniy razreza Mechetlino (Yuznyi Ural) [Ammonoideas from Artinskian-Kungurian deposits of Mechetlino section (Southern Ural)] // Byull. Moskovskogo Obschestva Ispytatelei Prirody. Otdelenie Geologicheskoe [Bull. Moscow Society of Naturalists. Geological department]. 2010. Vol. 85, Iss. 5. P. 33–39 (In Russian).
• Chernykh V.V. Zonalnyi metod v biostratigrafii. Zonalnaya shcala nihznei permi Urala po conodontam [Zonal method in biostratigraphy. Zonal scale of the Lower Permian of the Urals of conodonts]. Ekaterinburg: IGG UrO RAN, 2005. 217 p. (In Russian).
• Chernykh V.V. Nizhnepermskie konodonty Urala [Lower Permian conodonts of the Urals]. Ekaterinburg:IGG UrB RAS, 2006. 130 p. (In Russian).
• Chernykh V.V., Chuvashov B.I. O nizhnei granitce kungurskogo yarusa v razreze Mechetlino [About the lower boundary of the Kungurian Stage in the Mechetlino section] // Ezhegodnik–2005 / Institut geologii i geokhimii UrB RAS [Yearbook–2005 Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences]. Ekaterinburg: UrB RAS, 2006. P. 36–38 (In Russian).
• Chernykh V.V., Chuvashov B.I., Davydov V.I., Schmitz M.D. Mechetlino Section: A candidate for the Global Stratotype and Point (GSSP) of the Kungurian Stage (Cisuralian, Lower Permian) // Permophiles. – 2012. – No 56. – P. 21–34.
• Chernykh V.V., Chuvashov B.I., Davydov V.I., Schmitz M.D. Mechetlino Section // Southern Urals. Deep water successions of the Carboniferous and Permian / D.K. Nurgaliev (Ed.): PreCongress A3 Trip, 6–10 August, 2015. A Field Guidebook of XVIII International Congress on Carboniferous and Permian. August 11–15, 2015, Kazan, Russia. – Kazan: Academy of Sciences of the Republic of Tatarstan Press, 2015. – P. 5–19. [http://kpfu.ru/iccp2015].
• Chuvashov B.I. Fusulinidy zony Parafusulina solidissima na Urale [Fusulinides of Parafusulina solidissima Zone in the Urals] / Biostratigraphiya artinskogo i Kungurskogo yarusov Urala [Biostratigraphy of the Artinskian and Kungurian Stages of the Urals]. Sverdlovsk: UNSC of the USSR Academy of Sciences, 1980. P. 56–71 (In Russian).
• Chuvashov B.I. Kungurskii yarus permskoi sistemy. Problemy vydeleniya I korrelyatcii [Kungurian stage of the Permian System. Problems of Forming and Correlation] // Stratigraphy. Geological correlation. 1997. Vol. 5, Iss. 3. P. 10–28 (In Russian).
• Chuvashov B.I., Chernykh V.V. Kungurian Stage of the Cis-Uralian division: biostratigraphy and correlative potential // Permophiles. 2004. V. 44. P. 12.
• Chuvashov B.I., Chernykh V.V. Kungurskii yarus Obschei stratigraphicheskoi shkaly permskoi sistemy [Kungurian Stage of the Russian Stratigraphic Scale of the Permian System] // Dokl. RAS. 2000. Vol. 375, Iss. 3. P. 370–374 (In Russian).
• Chuvashov B.I., Chernykh V.V., Bogoslovskaya M.F., Misens G.A. Biostratigraphiya pogranichnykh artinsko-kungurskikh otlozhenii Zapadnogo Urala b Ptiuraliya [Biostratigraphy of boundary Artinskian-Kungurian deposits of the Western Urals and the Priurals] // Verkhnepermskie stratotipy Povolzhiya [Upper Permian stratotypes of the Volga region]. Moscow: GEOS, 1999. P. 336–369 (In Russian).
• Filimonova T.V. Smaller Foraminifers of the Lower Permian from Western Tethys // Stratigraphy and Geological Correlation. 2010. Vol. 18, No. 7, P. 687–811.
• Filimonova T.V., Isakova T.N., Gorozhanina E.N., Gorozhanin V.M. Cisuralian Series of the Permian System of the southeastern Sol-Iletsk Swell: biostratigraphy and lithology // Stratigraphy and Geol. Correlation. 2015. V. 23, No 2. P. 131–154.
• Filimonova T.V., Isakova T.N. New data on foraminifers from Mechetlino section — the GSSP candidate forthe Kungurian Stage // Kazan Golovkinsky Stratigraphic Meeting–2017 and Fourth All-Russian Conference “Upper Palaeozoic of Russia” Earth systems: high-precision biostratigraphy, geochronology and petroleum resources: Abstract volume. Kazan, Sept., 19–23, 2017. Kazan: Kazan University Press, 2017. P. 49–50.
• Kotlyar G., Sungatullina G., Sungatullin R. GSSPs for the Permian Cisuralian Series stages // Permophiles Issue. 2016. V. 63. P.32–37.
• Kutygin R.V. Ammonoids around the Artinskian-Kungurian boundary in the Mechetlino-3 section (Southern Cisuralian Region) // Kazan Golovkinsky Stratigraphic Meeting–2017 and Fourth All-Russian Conference “Upper Palaeozoic of Russia” Earth systems: high-precision biostratigraphy, geochronology and petroleum resources: Abstract volume. Kazan, Sept., 19–23, 2017. Kazan: Kazan University Press, 2017. P. 113–114.
• Murchison R.I. Geologicheskie nablyudeniya v Rossii [Geological observations in Russia] // Gornyi zhurnal [Mining Journal]. 1847. Part 4, book. 11–12. P. 160–170 (In Russian).
• Pnev V.P., Grozdilova V.P., Kruchinina A.N., Simakova M.A., Mikhaylova E.N. Artinskiy Yarus Srednego Urala [Artinskian Stage of the Middle Urals] / Stratigraphiya. Zapiski Leningradskogo Gornogo instituta [Stratigraphy. Zapiski of Leningrad Gornyi Institute]. 1972. Vol. LXIII, Iss. 2. Leningrad, P. 86–94 (In Russian).
• Shtukenberg A.A. Obschaya geologicheskaya karta Rossii [General geological map of Russia]. L. 138. Trudy Geol komiteta [Trudy Geol. Committee]. St. Petersburg, 1890. T. 4, № 2. 115 p. (In Russian).
• Stratigraphicheskie schemy Urala (docambriy, Paleozoi) [Stratigraphic schemes of the Urals (Precambrian, Paleozoic)]. Ekaterinburg, 1993 (In Russian).