Doklady Earth Sciences

, Volume 488, Issue 2, pp 1157–1160 | Cite as

Bol’shoi Ilek as the Ilek Formation Stratotype of the Lower Cretaceous and a New Dinosaur and Mammoth Fauna Site in the Southeastern Western Siberia

  • S. V. LeshchinskiyEmail author
  • A. V. Faingerts
  • S. V. Ivantsov


This paper clarifies the structure of the Bol’shoi Ilek section (height up to 83 m), which is composed by the deposits of Cretaceous and Quaternary systems, in the southeastern part of Western Siberia. The major volume of the section comprises the Lower Cretaceous rocks of the delta complex, reaching a thickness of 80 m and characterizing the Ilek Formation stratotype. The remains of fishes, lizards, turtles, crocodiliforms, dinosaurs, and mammals typical for the Barremian–Early Albian were found for the first time when screen-washing the sand fraction. The Mesozoic rocks are superposed by Quaternary eolian–deluvial and eluvial deposits with a thickness of 3–13.5 m or more. This sequence consists of three layers with mammoth fauna remains, the middle of which is dated at 14C ~ 22 500 years ago. In addition, according to the investigation data, Bol’shoi Ilek is a huge landslide with an area of more than 1 km2. All these facts make it possible to draw an analogy with the even-aged section of the Shestakovo high bank which also partially exposes the giant landslide. Such landslides are triggered by earthquakes with a magnitude of more than nine points, which is indicative of a powerful seismic event that occurred in the southeastern part of the study region at the very end of the Pleistocene.



We thank Ya.A. Bazhenova, E.M. Burkanova, N.N. Starikov, K.P. Lyalyuk, A.S. Samandrosova, A.T. Dzhumanov, and S.S. Perfilev (Tomsk State University), A.O. Averianov (Zoological Institute, Russian Academy of Sciences), I.T. Kuzmin and E.A. Boitsova (St. Petersburg State University), and L. Garbé and B. Hautier (Université Lille) for help in organization and performance of field works.


This study was carried out under the State Assignment of the Ministry of Education and Science of the Russian Federation, project no. 5.4217.2017/4.6.


  1. 1.
    S. V. Leshchinskiy and A. V. Faingerts, in Life Evolution at the Earth (Nauchno-tekhnicheskaya literatura, Tomsk, 2001), pp. 437–447 [in Russian].Google Scholar
  2. 2.
    L. A. Ragozin, Mater. Geol. Zap.-Sib. Kraya, No. 30 (1936).Google Scholar
  3. 3.
    A. R. Anan’ev, Tr. Tomsk. Gos. Univ. 124, 67–96 (1953).Google Scholar
  4. 4.
    A. A. Bulynnikova and L. Ya. Trushkova, in Stratigraphy and Paleontology of Mesozoic and Paleogene-Neogene Continental Sediments of the Asian Part of the USSR (Nauka, Leningrad, 1967), pp. 40–46 [in Russian].Google Scholar
  5. 5.
    A. K. Rozhdestvenskii, Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 40 (4), 118 (1955).Google Scholar
  6. 6.
    S. V. Leshchinsky, A. O. Averianov, A. V. Faingerts, P. P. Skutchas, and A. S. Dokl. Biol. Sci. 391, 349–352 (2003).CrossRefGoogle Scholar
  7. 7.
    A. Averianov, A. Lopatin, P. Skutschas, and S. Leshchinskiy, Geobios 48, 131–136 (2015).CrossRefGoogle Scholar
  8. 8.
    A. Averianov, S. Ivantsov, P. Skutschas, A. Faingertz, and S. Leshchinskiy, Geobios 51, 1–14 (2018).CrossRefGoogle Scholar
  9. 9.
    R. S. Il’in, Mater. Geol. Zap.-Sib. Kraya, No. 14 (1934).Google Scholar
  10. 10.
    E. I. Berzon, V. E. Barsegyan, T. A. Shatalina, and N. Ya. Chernenko, The 1 : 200 000Geological Map of the Russian Federation. Minusinsk Series. Sheet O-46-XXXI (Achinsk). Explanatory Note, 2nd ed. (Karpinsky Russ. Geol. Res. Inst., Moscow, 2015).Google Scholar
  11. 11.
    A. E. Kontorovich, S. V. Ershov, V. A. Kazanenkov, Yu. N. Karogodin, V. A. Kontorovich, N. K. Lebedeva, B. L. Nikitenko, N. I. Popova, and B. N. Shurygin, Russ. Geol. Geophys. 55 (5/6), 582–609 (2014).CrossRefGoogle Scholar
  12. 12.
    T. Elliott, in Sedimentary Environments and Facies, Ed. by H. G. Reading (Blackwell Sci. Publ., Oxford, 1986), pp. 113–154.Google Scholar
  13. 13.
    S. G. Lucas, Cretaceous Res. 27, 189–198 (2006).CrossRefGoogle Scholar
  14. 14.
    A. G. Goloverov, V. P. Rodionova, E. Ya. Goryukhin, V. Ya. Kolpakov, and V. L. Karlson, in Stratigraphy of Siberian Pleistocene. Topical Problems (Inst. Geol. Geophys. USSR Acad. Sci., Novosibirsk, 1985), pp. 29–36 [in Russian].Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • S. V. Leshchinskiy
    • 1
    Email author
  • A. V. Faingerts
    • 1
  • S. V. Ivantsov
    • 1
  1. 1.Tomsk State UniversityTomskRussia

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