Geologicheskii Vestnik

Peculiarities of conodonts and brachiopods change in a Frasnian-Famennian brachiopod coquina interval in classical carbonate sections of the Western Uralian Folded Zone in the Southern Urals are considered. In the Ryauzyak and Kuk-Karauk (Sikaza) sections, the boundary position is substantiated by conodonts at the bottom of the Barminsky horizon. It is established within a lithologically homogeneous brachiopod coquina by simultaneous emergence of the conodonts Palmatolepis triangularis Sann. and brachiopods Parapugnax markovskii (Yud.). The F/F boundary interval is subdivided into the Upper rhenana, linguiformis, Lower and Middle triangularis zones which are thoroughly characterized by means of conodonts and brachiopods. At the top of the Frasnian in all sections (linguiformis zone), a replacement of the palmatolepid biofacies with abundant taxa of the Palmatolepis genus by extremely poor monotaxonic icriodid biofacies is observed. This is probably due to changes in global sea levels and the Mass Extinction Event (Upper Kellwasser Event) at the F/F boundary

South Urals, boundary F/F interval, brachiopod coquina, conodonts, brachiopods, biofacies

• Abramova A.N. Franskii yarus zapadnogo sklona Yuzhnogo Urala [The Frasnian Stage of the western slope of the South Urals]: Preprint / Inst. Geol. USC RAS. Ufa, 1999. 55 p. (In Russian).
• Abramova A.N., Artyushkova O.V. The Frasnian-Famennian boundary in the Southern Urals // Geol. Quart. 2004. Vol. 48, No. 3. Р. 137–154.
• Alekseev A.S. Massovyye vymiraniya v fanerozoye [Mass Extinctions in the Phanerozoic Time]: Avtopef. dis. … d-ra geol.-min. nauk [Synopsis for doctoral thesis]. Moscow: MSU Press, 1998. 76 p. (In Russian).
• Artyushkova O.V., Maslov V.A., Pazukhin V.N., Kulagina E.I., Tagarieva R.Ch., Mizens L.I., Mizens A.G. Devonian and Lower Carboniferous type sections of the western South Urals: Pre-Conference Field Excursion Guidebook. International Conference “Biostratigraphy, Paleogeography and Events in Devonian and Lower Carboniferous”, Ufa, Sterlitamak, Russia, July 20–25, 2011. Ufa, 2011. 92 p.
• Barskov I.S., Alekseev A.S., Kononova L.I., Migdisova A.V. Opredelitel’ konodontov verchnego Devona i Karbona / Pod red. V.V. Mennera [Atlas of the Upper Devonian and Carboniferous conodonts / V V. Menner (ed.)] Moscow: MSU Press, 1987. 144 p. (In Russian).
• Baryshev V.N., Abramova A.N. Zonal’noe raschlenenie verchnedevonskikh otlozhenii zapadnogo sklona Yuzhnogo Urala po konodontam [Conodont zonal subdivision of the Upper Devonian deposites in the western slope of the Southern Urals] // Yezhegodnik – 1995 / IG USC RAS. Ufa, 1996. P. 26–30 (In Russian).
• Domrachev S.M. Devon khrebta Kara-Tau i prilegayushchikh raionov Yuzhnogo Urala [The Devonian of the Karatau Ridge and the adjacent regions of the South Urals] // Devon zapadnogo Priural’a [The Devonian of the West Pre-Urals]. Leningrad, Moscow, 1952. P. 5–121. (Trans. All-Union Res. Geol. Prosp. Inst. New ser.; Vol. 61). (In Russian).
• Kononova L.I. Komplexy konodontov iz verchnedevonskikh i nizhnekamennougol’nykh otlozhenii razreza r. Sikazy (Yuzhnyi Ural) [Upper Devonian and Lower Carboniferous Conodont complexes from the Sikaza section] // Bull. MOIP. Otdel geol. Vol. 44, No. 1. 1969. P. 121–138. (In Russian).
• Kononova L.I., Lipina O.A. Sootnosheniye zonal’nykh skhem verkhnego Famena i nizhnego Turne po foraminiferam i konodontam na zapadnom sklone Yuzhnogo Urala [The correlation of the Upper Famennian and Lower Tournaisian zonal schemes on foraminifera and conodonts in the Western slope of the South Urals] // Voprosy mikropaleontologii. 1971. Iss. 14. P. 39–69 (In Russian).
• Markovskiy B.P. Ocherk stratigrafi i devonskikh otlozhenii zapadnogo sklona Srednego i Yuzhnogo Urala [Essay on the stratigraphy of the Devonian sediments of the western slope of the Middle and Southern Urals] // Mat-ly Vses. nauchnoissled. Geol. in-ta. Obshch. ser. 1948. No. 8. P. 22–28 (In Russian).
• Maslov V.A. Litologiya i fatsial’nye osobennosti verchnedevonskikh karbonatnykh otlozhenii zapadnogo sklona Yuzhnogo Urala [Lithology and facies features of the Upper Devonian carbonate deposits of the western slope of the Southern Urals]: Dis. … kand. geol.-min. nauk. Ufa, 1959. 304 p. (In Russian).
• Mizens A.G. Brakhipody i biostratigrafi ya verkhnego devona Srednego i Yuzhnogo Urala [Brachiopods and biostratigraphy of the Upper Devonian of the Middle and Southern Urals]: Avtopef. dis. … kand. geol.-min. nauk / INGG SO RAN. Novosibirsk, 2009. 18 p. (In Russian).
• Mizens A.G. Brakhipody i biostratigrafi ya verkhnego devona Srednego i Yuzhnogo Urala [Brachiopods and biostratigraphy of the Upper Devonian of the Middle and Southern Urals]. Yekaterinburg: Ural branch RAS Publ., 2012. 324 p. (In Russian).
• Postanovleniya Mezhvedomstvennogo stratigrafi cheskogo komiteta Rossii i yego postoyannykh komissii [Decisions of the Interagency Stratigraphic Committee and its standing commissions] / A.I. Zhamoida (ed.). St. Petersburg, 2008. Is. 38. 131 p. (In Russian).
• Racki G. The Devonian bio-crisis and brachiopods: Introductory remarks // Acta Palaeontologica Polonica. 1988. Vol. 43, No. 2. P. 135–136.
• Racki G., Racka M., Matyja H., Devleeschouwer X. The Frasnian-Famennian boundary in the South Polish-Moravian shelf basins: integrated event-stratigraphical approach // Palaeogeography, Palaeoclimatology, Palaeoecology. 2002. Vol. 181. Р. 251–297. doi: 10.1016/S0031-0182(01)00481-3.
• Rzhonsnitskaya M.A., Markovskii B.P., Yudina Y.A., Sokiran E.V. Late Frasnian Atrypida (Brachiopoda) from the South Urals, South Timan and Kuznetsk Basin (Russia) // Acta Palaeontologica Polonica. 1998. Vol. 43, No. 2. Р. 305–344.
• Sandberg C.A., Dreesen R. Late Devonian icriodontid biofacies models and alternate shallow-water conodont zonation // Conodont biofacies and provincialism / D.L. Clark (ed.): Geological Society of America Special Paper. 1984. Vol. 196. P. 143–178. Doi: https://doi.org/10.1130/SPE196-p143.
• Sandberg C.A., Ziegler W., Dreesen R., Butler J.L. Late Frasnian mass extinction: conodont event stratigraphy, global changes, and possible causes // Courier Forschungsinstitut Senckenberg. 1988. Vol. 102. P. 263–307. (1st International Senckenberg Conference and 5th European Conodont Symposium (ECOS V); Contribution I).
• Schülke I. Evolutive Prozesse bei Palmatolepis in der frühen Famenne-Stufe (Conodonta, Ober-Devon) // Göttinger Arbeiten zur Geologie und Paläontologie. 1995. Vol. 67. Р. 1–108.
• Seddon G., Sweet W.C. An ecological model for conodonts // Journal of Paleontology. 1971. Vol. 45. P. 896–880.
• Seravkin I.B., Znamensky S.E., Kosarev A.M. Razryvnaja tektonika i rudonosnost’ Bashkirskogo Zaural’ja [Fault tectonics and the ore presence in the Bashkirian Trans-Urals]. Ufa: Poligrafkombinat Publ., 2001. 318 p. (In Russian).
• Stratigrafi cheskie skhemy Urala [Stratigraphic charts of the Urals] / N.Y. Antsygin, B.A. Popov, B.I. Chuvashov (eds.). Ekaterinburg, 1993. (In Russian).
• Tagarieva R.C. Conodont biodiversity of the FrasnianFamennian boundary interval (Upper Devonian) in the Southern Urals // Bul. of Geosciences. 2013. Vol. 88, No. 2. P. 297–314.
• Tagarieva R.Ch., Mizens A.G. Razrezy zapadnogo sklona Yuzhnogo Urala, perspektivnyye dlya vybora tochki regional’nogo stratotipa nizhnei granitsy famenskogo yarusa [Sections in the western slope of the south urals perspective for the choice of the famennian regional boundary stratotype point] // Lithosfera. 2015. No. 3. P. 33–56 (In Russian).
• Tyazheva A.P. Stratigrafi ya Devonskikh otlozhenii zapadnogo sklona Yuzhnogo Urala [The Stratigraphy of the Devonian deposits in the Western slope of the South Urals] // Devonskie otlozheniya Bashkirii [The Devonian deposits of Bashkiria]. Moscow: Acad. Sc. USSR Publ., 1961. Chast’ 1: Stratigraphiya [Pt. 1: Stratigraphy]. P. 5–130 (In Russian).
• Veimarn A.B., Naidin D.P., Kopayevich L.F., Alekseev A.S., Nazarov M.A. Method analiza global’nykh katastrofi cheskikh sobytii pri detal’nykh stratigrafi cheskikh issledovaniyakh: Metodicheskiye rekomendtsii [Methods for Analyzing Global Catastrophic Events under Detailed Stratigraphic Investigations: Guidelines]. Moscow: MSU Press, 1998. 190 p. (In Russian).
• Walliser O.H. Global events in the Devonian and Carboniferous // Global Events and Event Stratigraphy in the Phanerozoic / O.H. Walliser (ed.) Berlin: Springer Verlag, 1996. Р. 225–250. doi: 10.1007/978-3-642-79634-0_11.
• Yudina Yu.A. Rinkhonellidy iz barminskikh otlozhenii zapadnogo sklona Yuzhnogo Urala [Rhynchonellids (Brachiopoda) from the Barma deposits of the western slope of the South Urals] // Paleontologicheskii Journal. 1997. No. 5. P. 63–67 (In Russian).
• Ziegler W., Sandberg C.F. The Late Devonian Standart Conodont Zonation // Cour. Forsch. Inst. Senckenberg. 1990. Vol. 121. Р. 1–115.