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Itat Formation
Stratigraphic range: Bajocian-Bathonian ~170–166 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Sub-units	Lower, Middle and Upper members
Underlies	Tyazhin Formation
Overlies	Ilan Formation
Thickness	Several hundred metres
Lithology
Primary	Sandstone, mudstone, coal
Other	Siltstone
Location
Coordinates	55°42′N 89°12′E / 55.7°N 89.2°E / 55.7; 89.2
Approximate paleocoordinates	58°12′N 86°42′E / 58.2°N 86.7°E / 58.2; 86.7
Region	Siberia
Country	Russia
Extent	Krasnoyarsk krai, Nazarovo depression, SE West Siberian basin
Type section
Named for	Itatsky
Itat Formation (Russia)Show map of RussiaItat Formation (Krasnoyarsk Krai)Show map of Krasnoyarsk Krai

The Itat Formation (Russian: итатская свита) is a geologic formation in western Siberia. It was deposited in the Bajocian to Bathonian ages of the Middle Jurassic. Dinosaur remains are among the fossils that have been recovered from the formation, including the proceratosaurid Kileskus, as well as fish, amphibians, mammals and many other vertebrates. The formation is noted for bearing significant coal reserves, with large open pit coal mines extracting lignite from the unit currently in operation.

Lithology

The lower section of the formation is around 50–130 m thick, and consists of light grey sandstones with gravel, siltstone and rare coal beds. At the Dubinino locality, the 50 m exposed section of the upper part of the formation shows an irregular rhythmic alteration of fine grained sandstone, siltstone and mudstone and coal seams typically a few tens of cm's but up to several meters thick. The deposit is located on the South Eastern margin of the West Siberian basin

Locality

Most of the fossils were found in the overburden of Berezovsk coal mine, which is located in southern Krasnoyarsk Krai (Sharypovsky District) near the border with Kemerovo Oblast. The deposit is stratigraphically located in the upper member of the formation. The fossiliferous level of the locality is located above thick (> 50 m) coal seams and consists of unconsolidated silt and sand, which were deposited on an alluvial plain. Due to the fluvial origin of the sediment the remains are disarticulated and often are water worn, though they are mostly well preserved, which suggests they had not been significantly transported. The fossils were largely obtained by screenwashing of the debris. 10-15 tons of material have been processed so far.

Paleobiota

Taken from unless otherwise noted.

Fish

Amphibians

Turtles

Lepidosauromorphs

Choristoderes

Pterosaurs

Crocodyliforms

Dinosaurs

Dinosaurs of the Itat Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Kileskus	K. aristotocus	Berezovsk coal mine	Upper Member	Holotype description: "premaxilla, maxilla, a mandible fragment, and several limb bone parts"; referred material includes cervical and caudal vertebrae and numerous isolated teeth, as well as a fibula	Proceratosaurid
Heterodontosauridae	Indeterminate	Berezovsk coal mine	Upper Member	Isolated maxillary and dentary teeth
Mamenchisauridae	Indeterminate	Berezovsk coal mine	Upper Member	Numerous isolated teeth and two platycoelous posterior caudal vertebrae	Sauropod
Stegosauria	Indeterminate	Berezovsk coal mine	Upper Member	Fragmentary skeletons of at least two individuals

Mammaliamorphs

Insects

Numerous insect species are known from the Kubekovo village locality located within the upper member of the formation.

Flora

See also

• List of dinosaur-bearing rock formations

References

1. ^ Ivantsov, S. V.; Bystritskaya, L. I.; Krasnolutskii, S. A.; Lyalyuk, K. P.; Frolov, A. O.; Alekseev, A. S. (September 2016). "Middle Jurassic continental biota and paleolandscape in the Dubinino locality (Sharypovo area, Krasnoyarsk krai)". Stratigraphy and Geological Correlation. 24 (5): 486–502. Bibcode:2016SGC....24..486I. doi:10.1134/s0869593816050038. ISSN 0869-5938. S2CID 131891128.
2. ^ Averianov AO, Martin T, Skutschas PP, Danilov IG, Schultz JA, Schellhorn R, et al. (2016). "Middle Jurassic vertebrate assemblage of Berezovsk coal mine in western Siberia (Russia)". Global Geology. 19 (4): 187–204. doi:10.3969/j.issn.1673-9736.2016.04.01.
3. "THE ILANSK FORMATION AND ITS STRATOȚYPE". Russian Geology and Geophysics.
4. Le Heron, Daniel Paul; Buslov, Micha M.; Davies, Clare; Richards, Keith; Safonova, Inna (July 2008). "Evolution of Mesozoic fluvial systems along the SE flank of the West Siberian Basin, Russia". Sedimentary Geology. 208 (1–2): 45–60. Bibcode:2008SedG..208...45L. doi:10.1016/j.sedgeo.2008.05.001.
5. ^ Averianov, Alexander O.; Martin, Thomas; Lopatin, Alexey V.; Schultz, Julia A.; Schellhorn, Rico; Krasnolutskii, Sergei; Skutschas, Pavel; Ivantsov, Stepan (2020-04-30). Hautier, Lionel (ed.). "Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata". Papers in Palaeontology. 7 (2): 769–787. doi:10.1002/spp2.1317. ISSN 2056-2802. S2CID 219067218.
6. Skutschas, Pavel P.; Martin, Thomas; Krasnolutskii, Sergei A. (2016-02-24). "First Jurassic frog from Siberia, Russia". Journal of Vertebrate Paleontology. 36 (3): e1101376. doi:10.1080/02724634.2016.1101376. ISSN 0272-4634. S2CID 87712484.
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8. P. P. Skutschas & S. A. Krasnolutskii (2011). "A new genus and species of basal salamanders from the Middle Jurassic of western Siberia, Russia" (PDF). Proceedings of the Zoological Institute RAS. 315 (2): 167–175. doi:10.31610/trudyzin/2011.315.2.167. S2CID 32633522.
9. Skutschas, Pavel; Kolchanov, Veniamin; Krasnolutskii, Sergey; Averianov, Alexander; Schellhorn, Rico; Schultz, Julia; Martin, Thomas (2020-02-19). Porro, Laura Beatriz (ed.). "A new small-sized stem salamander from the Middle Jurassic of Western Siberia, Russia". PLOS ONE. 15 (2): e0228610. Bibcode:2020PLoSO..1528610S. doi:10.1371/journal.pone.0228610. ISSN 1932-6203. PMC 7029856. PMID 32074114.
10. Obraztsova, Ekaterina M.; Krasnolutskii, Sergei A.; Sukhanov, Vladimir B.; Danilov, Igor G. (2022-12-31). "Xinjiangchelyid turtles from the Middle Jurassic of the Berezovsk coal mine (Krasnoyarsk Territory, Russia): systematics, skeletal morphology, variation, relationships and palaeobiogeographic implications". Journal of Systematic Palaeontology. 20 (1): 2093662. doi:10.1080/14772019.2022.2093662. ISSN 1477-2019. S2CID 252140996.
11. ^ Danilov, I. G.; Obraztsova, E. M.; Boitsova, E. A.; Skutschas, P. P. (March 2018). "Diversity of Middle Jurassic Turtles from the Berezovsk Quarry Locality, Krasnoyarsk Region, Russia: Morphology and Histological Study". Paleontological Journal. 52 (2): 188–200. doi:10.1134/s0031030118010070. ISSN 0031-0301. S2CID 90021437.
12. Kuzmin, I.T.; Skutschas, P.P.; Grigorieva, O.I.; Krasnolutskii, S.A. (2013). "Goniopholidid crocodylomorph from the Middle Jurassic Berezovsk Quarry locality ( Western Siberia, Russia)". Proceedings of the Zoological Institute of the Russian Academy of Sciences. 317 (4): 452–458.
13. Averianov, A. O.; Krasnolutskii, S. A.; Ivantsov, S. V. (2010). "A new basal coelurosaur (Dinosauria: Theropoda) from the Middle Jurassic of Siberia". Proceedings of the Zoological Institute. 314 (1): 42–57. doi:10.31610/trudyzin/2010.314.1.42. S2CID 53491764.
14. O. Averianov, Alexander; Osochnikova, Anastasia; Skutschas, Pavel; Krasnolutskii, Sergei; Schellhorn, Rico; A. Schultz, Julia; Martin, Thomas (2019-09-16). "New data on the tyrannosauroid dinosaur Kileskus from the Middle Jurassic of Siberia, Russia". Historical Biology. 33 (7): 897–903. doi:10.1080/08912963.2019.1666839. ISSN 0891-2963. S2CID 203890300.
15. Averianov, Alexander; Krasnolutskii, Sergei; Ivantsov, Stepan; Skutschas, Pavel; Schellhorn, Rico; Schultz, Julia; Martin, Thomas (2019-03-01). "Sauropod remains from the Middle Jurassic Itat Formation of West Siberia, Russia". PalZ. 93 (4): 691–701. doi:10.1007/s12542-018-00445-8. ISSN 0031-0220. S2CID 135205021.
16. Averianov, A.O.; Krasnolutskii, S.A. (2009). "Stegosaur remains from the Middle Jurassic of West Siberia". Proceedings of the Zoological Institute RAS. 313 (2): 153–167. doi:10.31610/trudyzin/2009.313.2.153. S2CID 252886361.
17. Lopatin, A. V.; Averianov, A. O. (December 2007). "The earliest Asiatic pretribosphenic mammal (Cladotheria, Amphitheriidae) from the Middle Jurassic of Siberia". Doklady Biological Sciences. 417 (1): 432–434. doi:10.1134/s0012496607060063. ISSN 0012-4966. PMID 18274483. S2CID 1198624.
18. Averianov, Alexander; Martin, Thomas; Lopatin, Alexey; Krasnolutskii, Sergei (2013-12-22). "Stem therian mammal Amphibetulimus from the Middle Jurassic of Siberia". Paläontologische Zeitschrift. 89 (2): 197–206. doi:10.1007/s12542-013-0217-x. ISSN 0031-0220. S2CID 132581198.
19. Averianov, Alexander O.; Martin, Thomas; Lopatin, Alexey (2014-06-07). "The oldest dryolestid mammal from the Middle Jurassic of Siberia". Journal of Vertebrate Paleontology. 34 (4): 924–931. doi:10.1080/02724634.2014.837471. ISSN 0272-4634. S2CID 85070390.
20. ^ Averianov, A. A.; Lopatin, A. V.; Krasnolutskii, S. A.; Ivantsov, S. V. (2010). "New docodontians from the Middle Jurassic of Siberia and reanalysis of docodonta interrelationships" (PDF). Proceedings of the Zoological Institute RAS. 314 (2): 121–148. doi:10.31610/trudyzin/2010.314.2.121. S2CID 35820076.
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23. A. O. Averianov, A. V. Lopatin and S. A. Krasnolutskii (2011). "The first Haramiyid (Mammalia, Allotheria) from the Jurassic of Russia". Doklady Biological Sciences. 437 (1): 103–106. doi:10.1134/S0012496611020074. PMID 21562957. S2CID 31481732.
24. Averianov, Alexander O.; Martin, Thomas; Lopatin, Alexey V.; Schultz, Julia A.; Skutschas, Pavel P.; Rico, Schellhorn; Krasnolutskii, Sergei A. (2017-09-03). "A tritylodontid synapsid from the Middle Jurassic of Siberia and the taxonomy of derived tritylodontids". Journal of Vertebrate Paleontology. 37 (5): e1363767. doi:10.1080/02724634.2017.1363767. ISSN 0272-4634. S2CID 90249441.
25. Averianov, A. O.; Lopatin, A. V.; Krasnolutskii, S. A. (2008). "An amphilestid grade eutriconodontan from the Middle Jurassic of Russia". Russian Journal of Theriology. 7 (1): 1–4. doi:10.15298/rusjtheriol.07.1.01.
26. "Kubekovo village (PIN collection 1255)". Paleobiology Database.

• Geologic formations of Russia
• Jurassic System of Asia
• Jurassic Russia
• Bathonian Stage
• Bajocian Stage
• Paleontology in Russia
• Geography of Krasnoyarsk Krai