Geologicheskii Vestnik

The Bashkirian algal assemblages ofsections on the western slope of Southern Urals are characterized. The Askyn, Kurielga, and Basu sections are located in the Zilim-Zigan region of the West-Uralian Zone. These algal assemblages consist of green algae (Chlorophyta) and red algae (Rhodophyta). This is the first time that the algal distribution of the Kurielga section has been described. The species Asteroaoujgalia gibshmanae Brenckle, 2004 is reported from the Askyn Section, the first record for the Urals and from the Bashkirian. Previous records of this species are from the Viséan Stage (Lower Carboniferous). These are important Bashkirian rock-forming algae of the Urals, although they are not taxonomically diverse. Eleven genera of Chlorophyta and Rhodophyta have been identified. The green algae are represented by Beresella, Claracrusta, Anthracoporellopsis, Donezella; the red algae — by Asteroaoujgalia, Cuneiphycus, Eflügelia, Masloviporidium, Stacheoides, and Ungdarella. The most diverse groups are species of green algae of the genus Donezella (four species) and the red algae of the genus Ungdarella (two species). The algal facies are widespread in the Akavasian, Askynbashian, Tashastian and Asatauian (Bashkirian Stage) and in the Vereian (Moscovian Stage).

Pennsylvanian, Bashkirian Stage, South Urals, calcareous algae

• Akhmetshina L.Z., Gibshman N.B., Kuandykov B.M., Uskova N.A., Kononets V.I., Baymagambetov B.K., Kukhtinov D.A., Degtyareva L.V. Atlas paleontologicheskikh ostatkov, mikrofatsii i obstanovok osadkonakopleniya famensko-kamennougol’nykh otlozhenii Prikaspiiskoi vpadiny (Kazakhstanskaya chast’) [Atlas of paleontological remains, microfacies and sedimentation environments of Famennian-Carboniferous deposits of the Caspian depression (the Kazakhstan part)] / AktyubNIGRI. Almaty: CMYC-OFFSET, 2007. 476 p. (In Russian).
• Berchenko O.I. Novye vidy zelonykh vodoroslei iz otlozhenii verkhneserpukhovskogo pod’yarusa Donbassa [New species of the green algae from the deposits of the Upper-Pukhov substage of the Donbass] // Sistematika i evolyutsiya drevnikh rastenii Ukrainy [Systematics and evolution of ancient plants of Ukraine]. Kiev: Naukova Dumka, 1982. P. 51–55 (In Russian).
• Bogush O.I., Ivanova R.M., Luchinina V.A. Izvestkovye vodorosli verkhnego famena i nizhnego karbona Urala i Sibiri [Calcareous algae of the Upper Famennian and Lower Carboniferous of the Urals and Siberia]. Novosibirsk: Nauka, Sibirskoe otdelenie, 1990. 192 p. (In Russian).
• Brenckle P.L. Late Visean (Mississippian) calcareous microfossils from the Tarim Basin of Western China // J. Foraminiferal Res. 2004. V. 34, No. 2. P. 144–164. doi.org/10.2113/0340144.
• Chuvashov B.I., Ivanova R.M., Kolchina A.N. Verkhnii paleozoi vostochnogo sklona Urala. Stratigrafiya i geologicheskaya istoriya [Upper Paleozoic of the eastern slope of the Urals. Stratigraphy and geological history]. Sverdlovsk: UNTS AN SSSR, 1984. 230 p. (In Russian).
• Gibshman N.B., Alekseev A.S. Paleobiogeograficheskie svyazi al’goflory pozdnevizeiskogo Podmoskovnogo basseina [Paleobiogeographical connections of the algoflora of the Late Visean Region of the Moscow Region] // Sistematika organizmov. Ee znachenie dlya biostratigrafii i paleobiogeografii [Systematics of organisms. Its importance for biostratigraphy and paleobiogeography] Materialy LIX cessii Paleontologicheskogo obshchestva pri RAN [Paleontological Society at the Russian Academy of Sciences] (1–5 April, 2013, Sankt-Peterburg). SPb: VSEGEI, 2013. P. 36–37 (In Russian).
• Gibshman N.B., Alekseev A.S. The marine algaflora of the Late Visean (Early Carboniferous) of the Moscow Basin // Paleontol. Zh. 2017. No. 3, P. 313–325 (In Russian). doi.org/10.1134/S0031030117020071.
• Gibshman N.B., Kabanov P.B., Alekseev A.S., Goreva N.V., Moshkina M.A. Novogurovsky Quarry. Upper Visean and Serpukhovian // Type and reference Carboniferous sections in the south part of the Moscow Basin / A.S.Alekseev, N.V.Goreva (Eds.): Field trip guidebook of Intern. Field Meeting of the I.U.G.S. Subcommission on Carboniferous Stratigraphy «The historical type sections, proposed and potential GSSP of the Carboniferous in Russia» (Moscow, August 11–12, 2009). Moskow: PIN RAN, 2009. P. 13–45.
• Goreva N., Alekseev A. Conodonts and the Position of the Lower Boundary of the Moscovian Stage (Pennsylvanian) // Advances in Devonian, Carboniferous and Permian Research: Stratigraphy, Environments, Climate and Resources / D. Nurgaliev (Ed.): Proceedings of Kazan Golovkinsky Stratigraphic Meeting 2017. Kazan, Russian Federation, 19–23 September 2017. Filodiritto Publisher, 2018. P. 12–119.
• Gorozhanina Ye.N., Kulagina Ye.I., Gorozhanin V.M. Zhernovkova T.V., Ivanova R.M. Litofatsial’naya kharakteristika pogranichnykh otlozhenii bashkirskogo i moskovskogo yarusov srednego karbona razreza Basu (Yuzhnyi Ural) [Litofacial characteristics of the boundary deposits of the Bashkir and Moscow stages of the Middle Carboniferous Basus (Southern Urals)](In Russian) // Planetary Systems of the Upper Paleozoic: Biostratigraphy, Geochronology and Hydrocarbon Resources: Golovkinsky International Stratigraphic Conference-2017 and the 4-th All-Russian Conference “Upper Paleozoic of Russia”. Kazan: The Publishing House of Kazan University, 2017. P. 73–74.
• Groves J.R. Calcareous algae and associated microfossils from Mid-Carboniferous rocks in East-CentralIdaho // Journal of Paleontology. 1986. V. 60 (2). P. 476–496. doi.org/10.1017/s0022336000022009.
• Groves J.R., Mamet B.L. Masloviporidium, a cosmopolitium Middle Carboniferous red algae // Paleontology. Heidelberg: Sphringer-Verlag. 1985. P. 85–90. doi.org/10.1007/978-3-642-70355-3_8.
• Ivanova R.M. Bashkirskii yarus srednego techeniya reki Yuryuzan’ (zapadnyi sklon Yuzhnogo Urala) [Bashkirian stage of the middle reaches of the Yuryuzan River (western slope of the Urals)] // Yezhegodnik 1994. Yekaterinburg: IGG UrO RAN, 1995. P. 13–15 (In Russian).
• Ivanova R.M. Fuzulinidy i vodorosli srednego karbona Urala (zonal’naya stratigrafiya, paleobiogeografiya, paleontologiya) [Fusulinides and algae of the Middle Carboniferous of the Urals (zonal stratigraphy, paleobiogeography, paleontology)]. Yekaterinburg: UrO RAN, 2008. 205 p. (In Russian).
• Ivanova R.M. Izvestkovye vodorosli karbona Urala [Calcareous algae of the Carboniferous of the Urals]. Yekaterinburg: RIO UrO RAN, 2013. 244 p. (In Russian).
• Kulagina E.I., Pazukhin V.N. Pogranichnye otlozheniya bashkirskogo i moskovskogo yarusov v razreze “Seryat’” [Bashkirian-Moscowian bordery beds deposits in the “Seryat” section] // Putevoditel’ geologicheskikh ekskursii po karbonu Urala. Chast’ 1. Yuzhnoural’skaya ekskursiya [Guide of the geological excursions of the Carbonifrous of the Urals. Part 1.] / B.I. Chuvashov (ed.). Yekaterinburg: IGG UrO RAN, 2002. P. 34–40 (In Russian).
• Kulagina Ye.I., Klimenko T.V., Kochetova N.N. Bashkirskii yarus v razreze Kur’elga (bassein reki Basu) na zapadnom sklone Yuzhnogo Urala [Bashkirian stage of the Kuryelga section (basin of the Basu River) on the western slope of the Southern Urals] // Geologiya. Izvestiya Otdeleniya nauk o Zemle i prirodnykh resursov AN RB [Geology. Izvestiya of the Department of Earth Sciences and Natural Resources of the Academy of Sciences of the Bashkortostan Republic]. 2016. № 22. P. 3–11 (In Russian).
• Kulagina E.I., Pazukhin V.N., Davydov V.I. Pennsylvanian biostratigraphy of the Basu River section with emphasis on the Bashkirian-Moscovian transition // Carboniferous Type Sections in Russia and Potential Global Stratotypes. Southern Urals Session / V.N. Puchkov E.I. Kulagina, S.V. Nikolaeva, N.N. Kochetova (eds.): Proceedings of the International Field Meeting Ufa–Sibai, 13–18 August, 2009. Ufa, 2009. P. 42–63.
• Mamet B., Préat A. Un atlas d’algues calcaires. Carbonifere, Alaska arctique / Carnets de Géologie (Notebooks on Geology). Brest, Livre / Book / Publication Spéciuale, 2010/01 (CG2010_SP01). 60 p. doi.org/10.4267/2042/33628.
• Maslov V.P. Atlas porodoobrazuyushchikh organizmov (izvestkovykh i kremnevykh)[Atlas of the rock-forming organisms (calcareous and siliceous)]. Moscow: Nauka, 1973. 270 p. (In Russian).
• Proust J.-N., Vennin E., Vachard D., Bousseau Th., Chuvashov B., Ivanova R., Masse P., Maslo A. Etude semintologique et biostratigraphique du stratotype du Bashkirien (Oural du Sud. Russie) // Bull. Centres Rech. Explor.-Prod. Elf Aquitaine. 1996. V. 20, No. 2. P. 341–365.
• Sinitsyna Z.A. Bashkirskii yarus po reke Lakly na zapadnom sklone Yuzhnogo Urala [Bashkirian stage on the Lakly River on the western slope of the Southern Urals] // Stratigrafiya i geologiya karbona Yuzhnogo Urala i vostochnoi okrainy Russkoi platformy [Stratigraphy and geology of the Carboniferous of the Southern Urals and the eastern margin of the Russian Platform]. Ufa: BFAN SSSR, 1975. P. 86–94 (In Russian).
• Sinitsyna Z.A., Sinitsyn I.I. Biostratigrafiya bashkirskogo yarusa v stratotipe [Biostratigraphy of the Bashkirian stage in stratotype]. Ufa: BFAN SSSR, 1987. 76 p. (In Russian). Vachard D., Maslo A. Precisions biostratigraphiques et micropaleontologiques sur le Bashkirien d’Ukraine (Carbonifere moyen) //Revue de Paléobiologie. 1996. V. 15, No.2. P.357–383.