Ilek Formation
Ilek Formation Stratigraphic range: Lower Cretaceous | |
---|---|
Type | Geological formation |
Unit of | |
Underlies | |
Overlies | |
Thickness | Up to 746 metres (2,450 ft) |
Lithology | |
Primary | Clay, siltstone |
Other | Marl, sandstone |
Location | |
Coordinates | 55°54′N 88°00′E / 55.9°N 88.0°ECoordinates: 55°54′N 88°00′E / 55.9°N 88.0°E |
Approximate paleocoordinates | 54°12′N 84°36′E / 54.2°N 84.6°E |
Region | Western Siberia |
Country | ![]() |
Extent | ![]() |
Type section | |
Named by | L. A. Ragozin |
Year defined | 1935 |
![]() ![]() 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 | |
G. hoburensis[14] |
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[]
- ^ 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.
- ^ Криштофович А. Н., ed. (1955). "Илекская свита". Геологический словарь. 1 (А-Л). p. 271. ISBN 9785458366533.
- ^ Лебедев И. В., ed. (1962). Биостратиграфия мезозойских и третичных отложений Западной Сибири. pp. 168–169.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Fiorelli, L.E.; Calvo, J.O. (2007). "The first "protosuchian" (Archosauria: Crocodyliformes) from the Cretaceous (Santonian) of Gondwana" (PDF).
- ^ 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.
- ^ 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.
- ^ Trofimov, B. A. (1978). "The first triconodonts (Mammalia, Triconodonta) from Mongolia". Doklady Akademii Nauk SSSR. 243 (1): 213–216.
- ^ 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.
- ^ 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
- ^ E. N. Maschenko and A. V. Lopatin. 2002. A new Early Cretaceous mammal from Western Siberia. Doklady Biological Sciences 386:475-477
- ^ 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.
- ^ "Fossilworks: Stereognathus".
- ^ 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
Categories:
- Geologic formations of Russia
- Lower Cretaceous Series of Asia
- Cretaceous Russia
- Shale formations
- Siltstone formations
- Paleontology in Russia
- Geology of Siberia