# Sludkian Gorizont

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Geologic formation in Russia

The **Sludkian [Gorizont](/source/Gorizont_(geology))** ("Sludkian Horizon") is a [Lower Triassic](/source/Lower_Triassic) [biostratigraphic](/source/Biostratigraphic) unit in Western [Russia](/source/Russia). The Sludkian Gorizont is a part of the [Vetlugian Supergorizont](https://en.wikipedia.org/w/index.php?title=Vetlugian_Supergorizont&action=edit&redlink=1) and corresponds to the middle part of the early [Olenekian](/source/Olenekian) stage, lying above the [Rybinskian Gorizont](/source/Rybinskian_Gorizont) and below the [Ustmylian Gorizont](/source/Ustmylian_Gorizont). The Sludkian and Ustmylian Gorizonts are together encompassed by the "*[Wetlugasaurus](/source/Wetlugasaurus)* fauna", named after a [capitosaur](/source/Capitosaur) amphibian [index fossil](/source/Index_fossil). The Sludkian is characterized by *Wetlugasaurus angustifrons*, while the Ustmylian is characterized by *Wetlugasaurus malachovi*.[1][2]

The Sludkian is exposed in several svitas (equivalent to [geological formations](/source/Geological_formations)) spread out over a wide area: the main assemblage is the **Sludkinskaya Svita** in the [Moscow Syncline](https://en.wikipedia.org/w/index.php?title=Moscow_Syncline&action=edit&redlink=1), and another is the **Kzylsaiskaya Svita** of the [Ural](/source/Ural_(river))-[Samara](/source/Samara_(Volga)) Basin.[1]

## References

1. ^ [***a***](#cite_ref-Setal00_1-0) [***b***](#cite_ref-Setal00_1-1) Shishkin, M.A.; Ochev, V.G.; Lozovskii, V.R.; Novikov, I.V. (2000). "Tetrapod biostratigraphy of the Triassic of Eastern Europe". In Benton, M.J.; Shishkin, M.A.; Unwin, D.M.; Kurochkin, E.N. (eds.). *The Age of Dinosaurs in Russia and Mongolia*. Cambridge: Cambridge University Press. pp. 140–159. [ISBN](/source/ISBN_(identifier)) [9780521545822](https://en.wikipedia.org/wiki/Special:BookSources/9780521545822).

1. **[^](#cite_ref-:3_2-0)** Shishkin, M.A.; Sennikov, A.G.; Novikov, I.V.; Ilyina, N.V. (2006). ["Differentiation of Tetrapod Communities and Some Aspects of Biotic Events in the Early Triassic of Eastern Europe"](https://www.academia.edu/6366186). *Paleontological Journal*. **40** (1): 1–10. [doi](/source/Doi_(identifier)):[10.1134/S0031030106010011](https://doi.org/10.1134%2FS0031030106010011). [S2CID](/source/S2CID_(identifier)) [129895753](https://api.semanticscholar.org/CorpusID:129895753).

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Adapted from the Wikipedia article [Sludkian Gorizont](https://en.wikipedia.org/wiki/Sludkian_Gorizont) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sludkian_Gorizont?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.