Ilek Formation

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Ilek Formation
Stratigraphic range: Lower Cretaceous
TypeGeological formation
Unit of
Underlies
Overlies
ThicknessUp to 746 metres (2,450 ft)
Lithology
PrimaryClay, siltstone
OtherMarl, sandstone
Location
Coordinates55°54′N 88°00′E / 55.9°N 88.0°E / 55.9; 88.0Coordinates: 55°54′N 88°00′E / 55.9°N 88.0°E / 55.9; 88.0
Approximate paleocoordinates54°12′N 84°36′E / 54.2°N 84.6°E / 54.2; 84.6
RegionWestern Siberia
Country Russia
Extent Kemerovo Oblast
Type section
Named byL. A. Ragozin
Year defined1935
Ilek Formation is located in Russia
Ilek Formation
Ilek Formation (Russia)

The Ilek Formation is a Lower Cretaceous geologic formation in Western Siberia. Many different fossils have been recovered from the formation. It overlies the Late Jurassic Tyazhin Formation and underlies the Albian Kiya Formation.[1]

The formation was described by L. A. Ragozin in 1935. It consists of sands with sandstone concretions, layers of silts, clays and marls.[2] Age of the formation, according to a crude 1962 estimate, is Valanginian(?) - Hauterivian - Barremian. Its thickness varies greatly, reaching 746 m in Teguldet borehole.[3]

Fauna[]

Dinosaurs reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
Evgenavis[4] E. nobilis Siberia A set of limb elements A confuciusornithiform
Mystiornis[5] M. cyrili Western Siberia Shestakovo-1 locality Isolated metatarsus An avisaurid enantiornithean
Psittacosaurus[6] P. sibiricus Western Siberia Shestakovo Several skeletons A ceratopsian
Sibirotitan[7] S. astrosacralis Western Siberia Vertebrae, sacrum, and previously published pedal elements A somphospondylan
Dromaeosauridae[8] Indeterminate Teeth
Lithostrotia indet.[9] Indeterminate Western Siberia Caudal vertebrae A titanosaur
?Tyrannosauroidea Indeterminate Teeth
Turtles reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
Kirgizemys Indeterminate A macrobaenid
Crocodylomorphs reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
Kyasuchus[10] K. saevi Siberia A partial skull A shartegosuchid crocodyliform
Tagarosuchus[11] T. kulemzini Southern Siberia Shestakovo Nearly complete skull A crocodyliform
Mammaliamorphs reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
Acinacodus[12] A. tagaricus Western Siberia Right dentary fragment An amphidontid mammal
[13] B. clivosus Siberia Bol'shoi Kemchug 3 locality Upper premolar A multituberculate

Gobiconodon

G. hoburensis[14]

Siberia

21 upper and lower jaws. A gobiconodont

G. borissiaki[15]

Siberia A fragmentary lower jaw A gobiconodont
[16] K. magna A tooth An amphilestid mammal
[17] K. cardiodens Western Siberia A maxilla A zhangheotheriid mammal
[18] S. rossicus Siberia Lower jaw fragments A docodont mammaliaform
Xenocretosuchus[19] X. sibiricus Siberia Dental elements A tritylodontid mammaliamorph
[16] Y. domitor Siberia Shestakovo-1 locality A mandible A tinodontid mammal
Amphibians reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
K. leshchinskiyi Western Siberia A set of vertebrae A salamander
Lizards reported from the Ilek Formation
Genus Species Location Stratigraphic position Material Notes Images
[20] I. sibirica Western Siberia Bol'shoi Kemchug 3 locality A member of Paramacellodidae
S. voronkevichi Western Siberia Bol'shoi Kemchug 3 locality A knob-scaled lizard

See also[]

References[]

  1. ^ Golovneva, L. B.; Shchepetov, S. V. (April 2010). "Phytostratigraphy of Albian-Cenomanian sediments in the Kiya River basin (the Chulym-Yenisei area of the west Siberian lowland)". Stratigraphy and Geological Correlation. 18 (2): 153–165. Bibcode:2010SGC....18..153G. doi:10.1134/s0869593810020048. ISSN 0869-5938. S2CID 140540821.
  2. ^ Криштофович А. Н., ed. (1955). "Илекская свита". Геологический словарь. 1 (А-Л). p. 271. ISBN 9785458366533.
  3. ^ Лебедев И. В., ed. (1962). Биостратиграфия мезозойских и третичных отложений Западной Сибири. pp. 168–169.
  4. ^ O'Connor, JL; Averianov, AO; Zelenkov, NV (2014). "A confuciusornithiform (Aves, Pygostylia)-like tarsometatarsus from the Early Cretaceous of Siberia and a discussion of the evolution of avian hind". Journal of Vertebrate Paleontology. 34 (3): 647–656. doi:10.1080/02724634.2013.828734.
  5. ^ Evgeny N. Kurochkin; Nikita V. Zelenkov; Alexandr O. Averianov; Sergei V. Leshchinskiy (2011). "A new taxon of birds (Aves) from the Early Cretaceous of Western Siberia, Russia". Journal of Systematic Palaeontology. 9 (1): 109–117. doi:10.1080/14772019.2010.522202.
  6. ^ Averianov, Alexander O.; Voronkevich, Alexei V.; Leshchinskiy, Sergei V.; Fayngertz, Alexei V. (2006). "A ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of West Siberia, Russia and its phylogenetic relationships". Journal of Systematic Palaeontology. 4 (4): 359–395. doi:10.1017/s1477201906001933.
  7. ^ Alexander Averianov; Stepan Ivantsov; Pavel Skutschas; Alexey Faingertz; Sergey Leshchinskiy (2018). "A new sauropod dinosaur from the Lower Cretaceous Ilek Formation, Western Siberia, Russia". Geobios. in press. doi:10.1016/j.geobios.2017.12.004.
  8. ^ Averianov, A.O.; Ivantsov, S.V.; Skutschas, P.P. (2019-06-25). "Theropod teeth from the Lower Cretaceous Ilek Formation of Western Siberia, Russia". Proceedings of the Zoological Institute of the Russian Academy of Sciences (in Russian). 323 (2): 65–84. doi:10.31610/trudyzin/2019.323.2.65. ISSN 0206-0477.
  9. ^ Alexander O. Averianov; Stepan V. Ivantsov; Pavel P. Skutschas (2020). "Caudal vertebrae of titanosaurian sauropod dinosaurs from the Lower Cretaceous Ilek Formation in Western Siberia, Russia". Cretaceous Research. 107: Article 104309. doi:10.1016/j.cretres.2019.104309. S2CID 210619334.
  10. ^ Efimov, M. B. and Leshchinskiy, S. V. (2000). First finding of the fossil crocodile skull in Siberia [in Russian]. In: Komarov, A. V., ed., Materialy regional’noj konferencii geologov Sibiri, Dal’nego Vostoka i Severo−Vostoka Rossii. Tom II, 361–363. GalaPress, Tomsk.
  11. ^ Fiorelli, L.E.; Calvo, J.O. (2007). "The first "protosuchian" (Archosauria: Crocodyliformes) from the Cretaceous (Santonian) of Gondwana" (PDF).
  12. ^ A. V. Lopatin; E. N. Maschenko & A. O. Averianov (2010). "A new genus of triconodont mammals from the Early Cretaceous of Western Siberia". Doklady Biological Sciences. 433 (1): 282–285. doi:10.1134/S0012496610040137.
  13. ^ Alexander Averianov; Alexey Lopatin; Pavel Skutschas; Stepan Ivantsov; Elizaveta Boitsova; Ivan Kuzmin (2017). "An enigmatic multituberculate mammal from the Early Cretaceous of Siberia, Russia". Journal of Vertebrate Paleontology. 37 (2): e1293070. doi:10.1080/02724634.2017.1293070.
  14. ^ Trofimov, B. A. (1978). "The first triconodonts (Mammalia, Triconodonta) from Mongolia". Doklady Akademii Nauk SSSR. 243 (1): 213–216.
  15. ^ Maschenko, E. N.; Lopatin, A. V. (1998). "First record of an Early Cretaceous triconodont mammal in Siberia". Bull. Inst. R. Sci. Nat. Belg. 68: 233–236.
  16. ^ a b A. V. Lopatin, E. N. Maschenko, A. O. Averianov, A. S. Rezvyi, P. P. Skutschas and S. V. Leschinskiy. 2005. Early Cretaceous Mammals from Western Siberia: 1. Tinodontidae. Paleontological Journal 39(5):523-534
  17. ^ E. N. Maschenko and A. V. Lopatin. 2002. A new Early Cretaceous mammal from Western Siberia. Doklady Biological Sciences 386:475-477
  18. ^ Maschenko, E. N.; Lopatin, A. V.; Voronkevich, A. V. (2002). "A new genus of the tegotheriid docodonts (Docodonta, Tegotheriidae) from the Early Cretaceous of West Siberia". Russian Journal of Theriology. 1 (2): 75–81. doi:10.15298/rusjtheriol.01.2.01.
  19. ^ "Fossilworks: Stereognathus".
  20. ^ A. O. Averianov, P. P. Skutschas, A. V. Lopatin, S. V. Leschinskiy, A. S. Rezvyi and A. V. Fayngerts. 2005. Early Cretaceous mammals from Bol'shoi Kemchug 3 locality in West Siberia, Russia. Russian Journal of Theriology 4(1):1-12
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