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′N116°42′E / 52.5°N 116.7°E |
Approximate paleocoordinates | 58°00′N117°12′E / 58.0°N 117.2°E |
Region | Zabaykalsky Krai |
Country | Russia |
Extent | 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]
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.
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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: CS1 maint: DOI inactive as of July 2025 (link)