Sludkian Gorizont

{{Short description|Geologic formation in Russia}} The '''Sludkian [[Gorizont (geology)|Gorizont]]''' ("Sludkian Horizon") is a [[Lower Triassic]] [[biostratigraphic]] unit in Western [[Russia]]. The Sludkian Gorizont is a part of the [[Vetlugian Supergorizont]] and corresponds to the middle part of the early [[Olenekian]] stage, lying above the [[Rybinskian Gorizont]] and below the [[Ustmylian Gorizont]]. The Sludkian and Ustmylian Gorizonts are together encompassed by the "''[[Wetlugasaurus]]'' fauna", named after a [[capitosaur]] amphibian [[index fossil]]. The Sludkian is characterized by ''Wetlugasaurus angustifrons'', while the Ustmylian is characterized by ''Wetlugasaurus malachovi''.<ref name="Setal00">{{cite book |last1=Shishkin |first1=M.A. |title=The Age of Dinosaurs in Russia and Mongolia |last2=Ochev |first2=V.G. |last3=Lozovskii |first3=V.R. |last4=Novikov |first4=I.V. |publisher=Cambridge University Press |year=2000 |isbn=9780521545822 |editor=Benton, M.J. |location=Cambridge |pages=140–159 |chapter=Tetrapod biostratigraphy of the Triassic of Eastern Europe |editor2=Shishkin, M.A. |editor3=Unwin, D.M. |editor4=Kurochkin, E.N.}}</ref><ref name=":3">{{Cite journal |last1=Shishkin |first1=M.A. |last2=Sennikov |first2=A.G. |last3=Novikov |first3=I.V. |last4=Ilyina |first4=N.V. |date=2006 |title=Differentiation of Tetrapod Communities and Some Aspects of Biotic Events in the Early Triassic of Eastern Europe |url=https://www.academia.edu/6366186 |journal=Paleontological Journal |volume=40 |issue=1 |pages=1–10 |doi=10.1134/S0031030106010011 |s2cid=129895753}}</ref>

The Sludkian is exposed in several svitas (equivalent to [[geological formations]]) spread out over a wide area: the main assemblage is the '''Sludkinskaya Svita''' in the [[Moscow Syncline]], and another is the '''Kzylsaiskaya Svita''' of the [[Ural (river)|Ural]]-[[Samara (Volga)|Samara]] Basin.<ref name="Setal00" />

== References == {{reflist}}

[[Category:Geologic formations of Russia]] [[Category:Triassic System of Europe]] [[Category:Triassic Russia]] [[Category:Olenekian Stage]] [[Category:Paleontology in Russia]]