Progress in the study of the Devonian–Carboniferous boundary sections in the Berchogur Depression (Mugodzhary Mountains, western Kazakhstan)
Nikolaeva S.V. Kulagina E.I. Mustapayeva S.N. Alekseev A.S. Gatovsky Y.A. Denayer J. Ohar V. Kurilenko A.V. Zhaimina V.J. Mychko E.V.
September 2022Springer Science and Business Media Deutschland GmbH
PalZ
2022#96Issue 3415 - 447 pp.
The Devonian–Carboniferous boundary beds in the Berchogur (Birshogyr) sections in the Mugodzhary (Mugalzhary) Mountains in western Kazakhstan, known to contain various fossil groups, including ammonoids, conodonts, foraminifers, corals, crinoids, and trilobites, are re-examined. The siliciclastic-carbonate succession of the Zhangana Formation reveals the presence of several ammonoid, conodont, and foraminiferal zones. The succession contains the Acutimitoceras ammonoid Genozone, equivalent to the level of the Stockum ammonoid fauna of Germany, with the conodont Siphonodella sulcata appearing within the Genozone. The same beds show mass occurrences of the foraminifer Tournayellina pseudobeata. The study of the Berchogur sections began in the 1980s; these sections are among very few successions globally with ammonoids of the Acutimitoceras Genozone in association with conodonts and foraminifers. At that time, several outcrops in a small area in the upper reaches of Burtybai (Zhangansai) Creek and two boreholes drilled near the sections were studied, and new taxa of ammonoids, foraminifers, ostracods, conodonts, algae, and spores were described. New excavations in 2018–2020, in conjunction with a search for a new definition of the Devonian–Carboniferous boundary, provided abundant new information on these taxa, on the lithology, and on crinoids, trilobites, and corals. The exact position of marker fossils and lithological changes are documented in several sections along Burtybai Creek allowing an amended correlation with sections of the D–C boundary beds in Western Europe.
Ammonoids , Berchogur , Conodonts , Corals , Crinoids , Devonian–Carboniferous boundary , Foraminifers , Stratigraphy , Trilobites , Western Kazakhstan
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Natural History Museum, London, SW7 5BD, United Kingdom
Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya 123, Moscow, 117647, Russian Federation
Kazan Federal University, Kremlyovskaya 18, Kazan, 420008, Russian Federation
Institute of Geology, Ufa Federal Research Centre of the Russian Academy of Sciences, Karla Marksa 16/2, Ufa, Russian Federation
Institute of Geology, Oil, and Mining, Satbayev University (Kazakh National Research Technical University), Satbayev 22, Almaty, Kazakhstan
Department of Paleontology, Geology Faculty, Lomonosov Moscow State University, Leninskiye Gory 1, Moscow, 119991, Russian Federation
Evolution and Diversity Dynamics Lab, University of Liège, Allée du Six-Août B18, Sart Tilman, Liege, B4000, Belgium
Institute of Geology, Taras Shevchenko National University of Kyiv, Vasylkivska 90, Kyiv, 03022, Ukraine
Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences, Sakhyanova 6a, Ulan-Ude, 6720047, Russian Federation
Institute of Geological Sciences named after K. I. Satbayev, Satbayev University, Kabanbay Batyra 69a, Almaty, Kazakhstan
Shirshov Institute of Oceanology, Russian Academy of Sciences, Nahimovsky 36, Moscow, 117997, Russian Federation
Natural History Museum
Borissiak Paleontological Institute
Kazan Federal University
Institute of Geology
Institute of Geology
Department of Paleontology
Evolution and Diversity Dynamics Lab
Institute of Geology
Dobretsov Geological Institute
Institute of Geological Sciences named after K. I. Satbayev
Shirshov Institute of Oceanology
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