Sandula A.N.
sandula@geo.komisc.ru
Graduated from Syktyvkar State University (1998), specialization "Physics", additional program in specialization "Geology".PhD in Geology and Mineralogy.
Senior Researcher of the Institute of Geology of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences.
Area of scientific interests: lithology of the Carboniferous-Lower Permian carbonate deposits of the north-east of the European part of Russia.
Author of 152 publications.
Stratigraphy and lithology
| Article # 48_2025 | submitted on 10/30/2025 displayed on website on 12/19/2025 |
| 26 p. | Sandula A.N., Shadrin A.N. |
| Limestone microbialites in the Visean-Serpukhovian sections of the Unya River (Northern Urals) | |
| The results of studies of the form of precipitation, distribution, and formation conditions of microbialites in limestone deposition types of the Visean-Serpukhovian, which are widespread in the southeastern boundary of the Timan-Pechora petroleum basin (Unya Cave section, Unya River, Northern Urals) are presented. It has been established that microbialites the Unya Cave section is divided into separate forms (microclots, bacterial biofilms, colonies of cyanobacteria), ooliths, oncoliths, stromatoliths, thromboliths, and dendroliths. Their composition and quantity change from base to top of section. The relatively deep-water Visean limestones contain only isolated microbial forms in small quantities. The shallow-water rocks of the upper part of the Kosogor level of the Serpukhovian section contain columnar and layered stromatolites. The extremely shallow deposits of the Protvian level of the Serpukhovian section contain ooids, stromatolites, thrombolites, and dendrolites. It is assumed that by the beginning of the Protvian time, a shallow-water zone had been formed in the area of the Unya Cave section. Keywords: microbialite, limestone deposition type, Visean, Serpukhovian, Northern Urals. |
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| article citation | Sandula A.N., Shadrin A.N. Mikrobiolity izvestnyakovogo tipa razrezov vizeysko-serpukhovskikh otlozheniy r. Un'ya (Severnyy Ural) [Limestone microbialites in the Visean-Serpukhovian sections of the Unya River (Northern Urals)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2025, vol. 20, no. 4, available at: https://www.ngtp.ru/rub/2025/48_2025.html EDN: EZGFJE |
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Ponomarenko E.S., Ivanova R.M., Sandula A.N. Pervye nakhodki Kamaena (Chlorophyta) v serpukhovskikh otlozheniyakh (razrez «Un'inskaya Peshchera», Severnyy Ural) [The first finding of Kamaena (Chlorophyta) in the Serpukhovian strata ("Un'inskaya peschera" section, Northern Urals)]. Vestnik IG Komi NTs UrO RAN, 2015, no. 7, pp. 3-8. (In Russ.). EDN: UJKCNZ
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Riding R. Microbialites, stromatolites, and thrombolites. In J. Reitner, V. Thiel (eds), Encyclopedia of Geobiology. Encyclopedia of Earth Science Series, Springer, Heidelberg, 2011, pp. 635-654. DOI: 10.1007/978-1-4020-9212-1_196
Sandula A.N. Formatsii kamennougol'no-nizhnepermskikh karbonatnykh otlozheniy zapadnogo sklona Pechorskogo Urala (basseyn Verkhney Pechory) [Formations of the Carboniferous-Lower Permian carbonate strata of the Upper Pechora Basin (Northern Urals)]. Vestnik geonauk, 2023, no. 12, pp. 4-15. (In Russ.). DOI: 10.19110/geov.2023.12.1
Sandula A.N., Shadrin A.N. Mikrobiality v razreze «Un'inskaya peshchera» (nizhniy karbon, r. Un'ya, Severnyy Ural) [Microbialites in the "Un`inskaya peschera (Un`ya Cave)" section (Lower Carboniferous, Un`ya River, Northern Urals)]. Geologiya rifov - 2025: materialy Vserossiyskogo litologicheskogo soveshchaniya s mezhdunarodnym uchastiem. Syktyvkar: IG FITs Komi NTs UrO RAN, 2025, pp. 90-92. (In Russ.).
Shadrin A.N. Vizeyskoe osadkonakoplenie na severnom Urale [Visean sedimentation in the Northern Urals]. Paleozoyskoe osadkonakoplenie na vneshney zone shel'fa passivnoy kontinental'noy okrainy severo-vostoka Evropeyskoy platformy; otv. red. A.I. Antoshkina, V.A. Saldin. part 6, Syktyvkar: Geoprint, 2011, pp. 91-108. (In Russ.).
Shadrin A.N., Ivanova R.M., Ponomarenko E.S. Stromatolity v verkhnevizeyskikh otlozheniyakh razreza «Pacha-Lasta» (r. Ilych, Severnyy Ural) [Stromatolites in the Upper Visean strata of the Pacha-Lasta section (Ilych River, Northern Urals)]. Vestnik geonauk, 2023, no. 12 (348), pp. 16-23. (In Russ.). DOI: 10.19110/geov.2023.12.2
Shadrin A.N., Sandula A.N. Izvestnyakovyy tip razreza verkhnevizeysko-serpukhovskikh otlozheniy basseyna r. Un'ya (Severnyy Ural) [Limestone type of section of the Upper Visean–Serpukhovian strata of the Unya River basin (Northern Urals)]. Struktura, veshchestvo, istoriya litosfery Timano-Severoural'skogo segmenta: materialy 19-y nauchnoy konferentsii. Syktyvkar: Geoprint, 2010, pp. 202-205. (In Russ.).
Shadrin A.N., Sandula A.N. Litogeneticheskie osobennosti verkhnevizeyskikh otlozheniy izvestnyakovogo tipa Verkhney Pechory (Severnyy Ural) [Lithogenetic features of limestone strata types of Upper Viséan in the Upper Pechora Region (Northern Urals)]. Ot analiza veshchestva - k basseynovomu analizu: materialy 13-go Ural'skogo litologicheskogo soveshchaniya. Ekaterinburg: IGG UrO RAN, 2020, pp. 298-300. (In Russ.). EDN: LPKBZW
Shadrin A.N., Sandula A.N. Stroenie razreza nizhnekamennougol'nykh otlozheniy izvestnyakovogo tipa v basseyne r. Un'ya (Severnyy Ural) [Structure of the Lower Carboniferous limestone strata in the Un`ya River basin (Northern Urals)]. Geologiya i mineral'nye resursy Evropeyskogo Severo-Vostoka Rossii: materialy 17 Geologicheskogo s"ezda Respubliki Komi, Syktyvkar: Geoprint, 2019, vol. 2, pp. 233-235. (In Russ.).
Shadrin A.N., Sandula A.N. Tipy porod verkhnevizeysko-nizhneserpukhovskikh otlozheniy v razreze r. Un'ya (Severnyy Ural) [Types of rocks in the Upper Visean-Lower Serpukhovian strata in the Un`ya River section (Northern Urals)]. Karbonatnye osadochnye posledovatel'nosti Urala i sopredel'nykh territoriy: sedimento- i litogenez, minerageniya: materialy 6 Ural'skogo regional'nogo litologicheskogo soveshchaniya. Ekaterinburg, 2004, pp. 193-195.
Varsanof'eva V.A. K kharakteristike vizeyskikh otlozheniy basseyna Maloy Pechory [To characteristics of the Visean strata in the Malaya Pechora basin]. Geologiya severo-vostoka Russkoy platformy i Pripolyarnogo Urala. Syktyvkar: Komi knizhnoe izdatel'stvo, 1965, pp. 3-20. (Trudy Instituta geologii/ AN SSSR. Komi filial; issue 5). (In Russ.).
Varsanof'eva V.A. Predvaritel'nyy otchet o rabotakh 1927 g. v zapadnoy chasti yugo-vostochnoy chetverti 124-go lista (basseyn r. Un'i) [Preliminary report on the works of 1927 in the western part of the southeastern quarter of the 124th sheet (Basin of the Un`ya river)]. Moscow-Leningrad, 1933, 47 p. (Tr. VGRO, vyp. 289). (In Russ.).
Varsanof'eva V.A., Kalashnikov N.V., Lipina O.A. Turneyskie otlozheniya basseyna Verkhney Pechory [Tournaisian strata of the Upper Pechora basin]. Syktyvkar: Komi nauchnyy tsentr UrO AN SSSR, 1990, pp. 52-86. (In Russ.).
Antoshkina A.I., Ponomarenko E.S. Bioindutsirovannaya krustifikatsiya kak reaktsiya pozdnekamennougol'no-rannepermskikh rifovykh ekosistem na izmeneniya biosfery [Bioinduced crustification as a reaction of Late Carboniferous-Early Permian reef ecosystems to changes in the biosphere)]. Stanovlenie skeleta u razlichnykh grupp organizmov i biomineralizatsiya v istorii Zemli. Seriya «Geo-biologicheskie protsessy v proshlom». Moscow: PIN RAN, 2014, pp. 44-62. (In Russ.).
Burne R.V., Moore L. Microbialites; organosedimentary deposits of benthic microbial communities. Palaios, 1987, no. 2, pp. 241-254. DOI: 10.2307/3514674
Chochia N.G. Geologicheskoe stroenie Kolvo-Visherskogo kraya [The geological structure of the Kolva-Vishera region]. Leningrad: Izd-vo AN SSSR, 1955, 403 p. (Tr. VNIGRI, issue 91) (In Russ.).
Coated Grains. Ed. T.M. Peryt. Springer Berlin–Heidelberg, New York, Tokio, 1983, 655 p. DOI: 10.1007/978-3-642-68869-0
Flügel E. Microfacies of Carbonate Rocks Analysis, Interpretation and Application. Second Edition. With a contribution by A. Munnecke. Springer. Berlin-New York, 2010, 1006 p. DOI: 10.1007/10.1007/978-3-642-03796-2
Flügel E., Hillmer G., Scholz J. Microbial carbonates and reefs: An introduction. Facies 29, 1993, no. 1-2. DOI: 10.1007/BF02536914
Fortunatova N.K., Kartseva O.A., Baranova A.V., Agafonova G.V., Ofman I.P. Atlas strukturnykh komponentov karbonatnykh porod [Atlas of structural components of carbonate rocks]. Moscow: VNIGNI, 2005, 440 p. EDN: QKNUJV
Geologicheskiy slovar'. V trekh tomakh. Izdanie tret'e, pererab. i dop. [Geologicheskij slovar'. V trekh tomakh. Izdanie tret'e, pererab. i dop.]. Editor-in-Chief O.V. Petrov. Vol. 1. A-Y. St. Petersburg: Izd-vo VSEGEI, 2010, 432 p. (In Russ.).
Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:200000 (vtoroe izdanie). Severo-Ural'skaya seriya List R-40-XXIII (Talovo). Ob"yasnitel'naya zapiska [State Geological Map of the Russian Federation. Scale 1:200,000 (second edition). North Ural Series Sheet R-40-XXIII (Talovo). Explanatory Note]. V.N. Ivanov, S.I. Kirillin, I.Yu. Kurzanov, D.V. Zarkhidze, N.A. Kuzenkov, G.A. Chupriyanovskaya, N.A. Vasil'chenko; ed. G.G. Morozov. St. Peterburg, 2008, 141 p. (In Russ.).
Kalashnikov N.V. Nizhnekamennougol'nye otlozheniya basseyna reki Un'i [Lower carboniferous strata of the Un`ya River basin]. Stratigrafiya kamennougol'nykh otlozheniy zapadnogo sklona Severnogo i Pripolyarnogo Urala. Syktyvkar: Komi Knizhnoe izdatel'stvo, 1970, pp. 25-40. (Trudy Instituta geologii / AN SSSR. Komi filial; issue 11). (In Russ.). EDN: QZTTLX
Kuznetsov B.G., Antoshkina A.I. Pozdnevizeysko-serpukhovskiy etap paleozoyskogo rifoobrazovaniya [The Late Visean-Serpukhovian stage in Paleozoic reef formation]. Stratigrafiya. Geologicheskaya korrelyatsiya, 2005, vol. 13, no. 4, pp. 61-77. (In Russ.). EDN: HSJACN
Kuznetsov V.G. Asinkhronnost' razvitiya rifov i rifostroyashchey bioty. Paleozoy [Asynchronous development of reefs and reef-building biota. Paleozoic]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka, 2020, vol. 63(1), pp. 54-62. (In Russ.). DOI: 10.32454/0016-7762-2020-63-1-54-62
Kuznetsov V.G. Litologiya mikrobiolitov [Lithology of microbioliths]. Vestnik Rossiyskoy akademii nauk, 2015, vol. 85, no. 12, pp. 1092-1102. (In Russ.). DOI: 10.7868/S0869587315120087
Kuznetsov V.G., Zhuravleva L.M. Mikrobial'nye karbonatnye porody - sostav, struktury, tekstury, mekhanizmy i obstanovki obrazovaniya. Vozniknovenie ucheniya o mikrobial'nykh obrazovaniyakh i ikh formakh. Stat'ya 1 [Microbial carbonate rocks: composition, structures, textures, mechanisms and environments of formation. Microbiolite formation processes and environments. Article 1]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka, 2022a, vol. 64(3), pp. 8-18. (In Russ.). DOI: 10.32454/0016-7762-2022-64-3-8-18
Kuznetsov V.G., Zhuravleva L.M. Mikrobial'nye karbonatnye porody - sostav, struktury, tekstury, mekhanizmy i obstanovki obrazovaniya. Protsessy i obstanovki obrazovaniya mikrobiolitov. Stat'ya 2 [Microbial carbonate rocks: composition, structures, textures, mechanisms and environments of formation. Microbiolite formation processes and environments. Article 2]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka, 2022b, vol. 64(4), pp. 10-21. (In Russ.). DOI: 10.32454/0016-7762-2022-64-4-10-21
Mamet B., Preat A. Un atlas d'algues calcaires. Carbonifère, Alaska arctique. Carnets de Géologie - Notebooks on Geology, Brest, Livre, 2010, 60 p. (Publication Spéciale 2010/01 (CG2010_SP01)). DOI: 10.4267/2042/33628
Ponomarenko E.S., Ivanova R.M., Sandula A.N. Pervye nakhodki Kamaena (Chlorophyta) v serpukhovskikh otlozheniyakh (razrez «Un'inskaya Peshchera», Severnyy Ural) [The first finding of Kamaena (Chlorophyta) in the Serpukhovian strata ("Un'inskaya peschera" section, Northern Urals)]. Vestnik IG Komi NTs UrO RAN, 2015, no. 7, pp. 3-8. (In Russ.). EDN: UJKCNZ
Riding R. Microbial carbonates: the geological record of calcified bacterial-algal mats and biofilms. Sedimentology, 2000, vol. 47 (suppl. 1), pp. 179-214. DOI: 10.1046/j.1365-3091.2000.00003.x
Riding R. Microbialites, stromatolites, and thrombolites. In J. Reitner, V. Thiel (eds), Encyclopedia of Geobiology. Encyclopedia of Earth Science Series, Springer, Heidelberg, 2011, pp. 635-654. DOI: 10.1007/978-1-4020-9212-1_196
Sandula A.N. Formatsii kamennougol'no-nizhnepermskikh karbonatnykh otlozheniy zapadnogo sklona Pechorskogo Urala (basseyn Verkhney Pechory) [Formations of the Carboniferous-Lower Permian carbonate strata of the Upper Pechora Basin (Northern Urals)]. Vestnik geonauk, 2023, no. 12, pp. 4-15. (In Russ.). DOI: 10.19110/geov.2023.12.1
Sandula A.N., Shadrin A.N. Mikrobiality v razreze «Un'inskaya peshchera» (nizhniy karbon, r. Un'ya, Severnyy Ural) [Microbialites in the "Un`inskaya peschera (Un`ya Cave)" section (Lower Carboniferous, Un`ya River, Northern Urals)]. Geologiya rifov - 2025: materialy Vserossiyskogo litologicheskogo soveshchaniya s mezhdunarodnym uchastiem. Syktyvkar: IG FITs Komi NTs UrO RAN, 2025, pp. 90-92. (In Russ.).
Shadrin A.N. Vizeyskoe osadkonakoplenie na severnom Urale [Visean sedimentation in the Northern Urals]. Paleozoyskoe osadkonakoplenie na vneshney zone shel'fa passivnoy kontinental'noy okrainy severo-vostoka Evropeyskoy platformy; otv. red. A.I. Antoshkina, V.A. Saldin. part 6, Syktyvkar: Geoprint, 2011, pp. 91-108. (In Russ.).
Shadrin A.N., Ivanova R.M., Ponomarenko E.S. Stromatolity v verkhnevizeyskikh otlozheniyakh razreza «Pacha-Lasta» (r. Ilych, Severnyy Ural) [Stromatolites in the Upper Visean strata of the Pacha-Lasta section (Ilych River, Northern Urals)]. Vestnik geonauk, 2023, no. 12 (348), pp. 16-23. (In Russ.). DOI: 10.19110/geov.2023.12.2
Shadrin A.N., Sandula A.N. Izvestnyakovyy tip razreza verkhnevizeysko-serpukhovskikh otlozheniy basseyna r. Un'ya (Severnyy Ural) [Limestone type of section of the Upper Visean–Serpukhovian strata of the Unya River basin (Northern Urals)]. Struktura, veshchestvo, istoriya litosfery Timano-Severoural'skogo segmenta: materialy 19-y nauchnoy konferentsii. Syktyvkar: Geoprint, 2010, pp. 202-205. (In Russ.).
Shadrin A.N., Sandula A.N. Litogeneticheskie osobennosti verkhnevizeyskikh otlozheniy izvestnyakovogo tipa Verkhney Pechory (Severnyy Ural) [Lithogenetic features of limestone strata types of Upper Viséan in the Upper Pechora Region (Northern Urals)]. Ot analiza veshchestva - k basseynovomu analizu: materialy 13-go Ural'skogo litologicheskogo soveshchaniya. Ekaterinburg: IGG UrO RAN, 2020, pp. 298-300. (In Russ.). EDN: LPKBZW
Shadrin A.N., Sandula A.N. Stroenie razreza nizhnekamennougol'nykh otlozheniy izvestnyakovogo tipa v basseyne r. Un'ya (Severnyy Ural) [Structure of the Lower Carboniferous limestone strata in the Un`ya River basin (Northern Urals)]. Geologiya i mineral'nye resursy Evropeyskogo Severo-Vostoka Rossii: materialy 17 Geologicheskogo s"ezda Respubliki Komi, Syktyvkar: Geoprint, 2019, vol. 2, pp. 233-235. (In Russ.).
Shadrin A.N., Sandula A.N. Tipy porod verkhnevizeysko-nizhneserpukhovskikh otlozheniy v razreze r. Un'ya (Severnyy Ural) [Types of rocks in the Upper Visean-Lower Serpukhovian strata in the Un`ya River section (Northern Urals)]. Karbonatnye osadochnye posledovatel'nosti Urala i sopredel'nykh territoriy: sedimento- i litogenez, minerageniya: materialy 6 Ural'skogo regional'nogo litologicheskogo soveshchaniya. Ekaterinburg, 2004, pp. 193-195.
Varsanof'eva V.A. K kharakteristike vizeyskikh otlozheniy basseyna Maloy Pechory [To characteristics of the Visean strata in the Malaya Pechora basin]. Geologiya severo-vostoka Russkoy platformy i Pripolyarnogo Urala. Syktyvkar: Komi knizhnoe izdatel'stvo, 1965, pp. 3-20. (Trudy Instituta geologii/ AN SSSR. Komi filial; issue 5). (In Russ.).
Varsanof'eva V.A. Predvaritel'nyy otchet o rabotakh 1927 g. v zapadnoy chasti yugo-vostochnoy chetverti 124-go lista (basseyn r. Un'i) [Preliminary report on the works of 1927 in the western part of the southeastern quarter of the 124th sheet (Basin of the Un`ya river)]. Moscow-Leningrad, 1933, 47 p. (Tr. VGRO, vyp. 289). (In Russ.).
Varsanof'eva V.A., Kalashnikov N.V., Lipina O.A. Turneyskie otlozheniya basseyna Verkhney Pechory [Tournaisian strata of the Upper Pechora basin]. Syktyvkar: Komi nauchnyy tsentr UrO AN SSSR, 1990, pp. 52-86. (In Russ.).