Ukureyskaya Formation
| Ukureyskaya Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Sub-units | Lower, Middle and Upper subformations |
| Underlies | Utanskaya Formation |
| Overlies | Kulindinskaya Formation |
| Thickness | Several hundred metres |
| Lithology | |
| Primary | Sandstone, siltstone, tuffite |
| Other | Mudstone |
| Location | |
| Coordinates | 52°30′N 116°42′E / 52.5°N 116.7°E |
| Approximate paleocoordinates | 58°00′N 117°12′E / 58.0°N 117.2°E |
| Region | Zabaykalsky Krai |
| Country | Russia |
| Extent | Zabaykalsky Krai |
  Ukureyskaya Formation (Russia)  Ukureyskaya Formation (Zabaykalsky Krai) | |
The Ukureyskaya Formation, also referred to as the Ukurey Formation, is a geological formation in Zabaykalsky Krai, part of the Russian Far East. It is made up of Middle Jurassic and Late Jurassic layers.[1] It covers large areas around Kulinda.[2]
History[edit]
The Ukureyskaya Formation was mentioned by Sinitsa & Starukhina (1986),[3] and was first discovered by Sofia M. Sinitsa and her team from the Russian Academy of Sciences before being excavated in 2010 by a group of Russian and Belgian palaeontologists;[4] during this time, the holotype of Kulindadromeus zabaikalicus was discovered.[5] Excavations wrapped up in 2013 or 2014.[6]
Description[edit]
The volcanic ash layers of the Ukureyskaya Formation form a Konservat-Lagerstätte with an exceptional preservation,[1] and it likely represents a nearshore lacustrine or estuarine-deltaic environment similar to the Yixian Formation.[2]
In total, two bone beds were identified during the excavations that took place between 2010 and 2013/14;[6] Bonebed 4 is older than Bonebed 3.
Age[edit]
Sinitsa & Starukhina (1986) and Sinitsa (2011) suggested that the Ukureyskaya Formation dated to the Late Jurassic-Early Cretaceous.[3][4]
Godefroit et al. (2014) and Alivanov & Saveliev (2014) have suggested that as a whole, the Ukureyskaya Formation dates to the Bajocian-Tithonian,[5][7] while more recent dating work by Cincotta et al. (2019) suggests that the layers containing the remains of Kulindadromeus are Bathonian in age.[8]
Paleofauna[edit]
| Genus | Species | Location | Stratigraphic position | Material | Notes | Image |
|---|---|---|---|---|---|---|
| Crustacea[2] | Indeterminate[2] | Kulinda[2] | "Indeterminate remains"[2] | |||
| Insecta[5] | Indeterminate[5] | Kulinda[5] | Represented by multiple species.[5] | 
| ||
| Kulindadromeus[5][7] | K. zabaikalicus[5][7] | Kulinda[5] | "Base of the Ukureyska Formation"[5] | "Hundreds of disarticulated skeletons including six skulls"[5] | Synonyms include Daurosaurus olovus and Lepidocheirosaurus natalis.[9] | 
|
| Ornithopoda[2] | Indeterminate[2] | Kulinda[2] | "Indeterminate remains"[2] | Represents an unnamed genus that is distinct from Kulindadromeus.[2] | ||
| Theropoda[2] | Indeterminate[2] | Kulinda[2] | "Single tooth"[2] | Based on undiagnostic remains.[2] |
References[edit]
- ^ a b Sinitsa, S.; Reshetova, S.; Vilmova, E. (2017). "Hypostratotypes of Ukureyskaya Formation of Novoberezovka and Olov Depressions of Transbaikalia (Part 1. Hypostratotype-1 of Ukureyskaya Formation of Novoberezovka Depression)". Transbaikal State University Journal (in Russian). 23 (6): 52–62. doi:10.21209/2227-9245-2017-23-6-52-62 (inactive 2024-06-12). ISSN 2227-9245.
{{cite journal}}: CS1 maint: DOI inactive as of June 2024 (link) - ^ a b c d e f g h i j k l m n o p "The Kulinda fossil site", University of Bristol Palaeobiology Research Group. Retrieved 4 April 2015
- ^ a b Sinitsa S.M., Starukhina S. (1986) New data and problems in stratigraphy and palaeontology of the Upper Meso�zoic in East Transbaikalia. In: Novye Dannye po Geologii Zabaikal’ya. Min. Geol. RSFSR, Moscow, pp 46–51
- ^ a b Sinitsa S.M. (2011). Jurassic dinosaurs of Transbaikalia. In: Sinitsa SM (ed) Environmental cooperative studies in the cross-border ecological region: Russia, China, and Mongolia. Inst. Min. Res., Ecol. Cryol. SB RAS, Chita, pp 173–176
- ^ a b c d e f g h i j k Godefroit, P.; Sinitsa, S.M.; Dhouailly, D.; Bolotsky, Y.L.; Sizov, A.V.; McNamara, M.E.; Benton, M.J.; Spagna, P. (2014). "A Jurassic ornithischian dinosaur from Siberia with both feathers and scales" (PDF). Science. 345 (6195): 451–455. Bibcode:2014Sci...345..451G. doi:10.1126/science.1253351. hdl:1983/a7ae6dfb-55bf-4ca4-bd8b-a5ea5f323103. PMID 25061209. S2CID 206556907. Archived from the original (PDF) on 2019-02-09. Retrieved 2016-07-27.
- ^ a b Dan Vergano, 2014, "Siberian Discovery Suggests Almost All Dinosaurs Were Feathered", National Geographic Daily News [1]
- ^ a b c Alifanov, V.R.; Saveliev, S.V. (2014). "Two new ornithischian dinosaurs (Hypsilophodontia, Ornithopoda) from the Late Jurassic of Russia" (PDF). Paleontologicheskii Zhurnal. 4: 72–82. (in Russian; English translation published in Alifanov, V. R. (2014). "Two new ornithischian dinosaurs (Hypsilophodontia, Ornithopoda) from the Late Jurassic of Russia". Paleontological Journal. 48 (4): 414–425. doi:10.1134/S0031030114040029. S2CID 85539844.)
- ^ Cincotta, Aude; Pestchevitskaya, Ekaterina B.; Sinitsa, Sofia M.; Markevich, Valentina S.; Debaille, Vinciane; Reshetova, Svetlana A.; Mashchuk, Irina M.; Frolov, Andrei O.; Gerdes, Axel; Yans, Johan; Godefroit, Pascal (2019-02-01). "The rise of feathered dinosaurs: Kulindadromeus zabaikalicus , the oldest dinosaur with 'feather-like' structures". PeerJ. 7: e6239. doi:10.7717/peerj.6239. ISSN 2167-8359. PMC 6361000. PMID 30723614.
- ^ Andrea Cau (November 24, 2015). "Cosa è Lepidocheirosaurus?". Theropoda. Retrieved November 25, 2015.
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