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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]
| 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 | 52.5°N 116.7°E |
| Approximate paleocoordinates | 58.0°N 117.2°E |
| Region | Zabaykalsky Krai |
| Country | Russia |
| Extent | Zabaykalsky Krai |
  Ukureyskaya Formation (Russia)  Ukureyskaya Formation (Zabaykalsky Krai) | |
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]
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
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]
| 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] |
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