Bukobay Svita

The Bukobay Svita (also anglicized as Bukobay or Bukobai Formation) is a Middle Triassic geological unit in Russia.^[1][2][3] It is composed primarily of red or grey lacustrine sediments, reconstructing a humid and marshy depositional environment. Bukobay is the youngest section of a Triassic terrestrial succession exposed south of the Ural Mountains. It is equivalent to a biostratigraphic unit, the Bukobay Gorizont, which is also called the "Bukobay Horizon" or "Mastodonsaurus" fauna).

Bukobay Svita
Stratigraphic range: Ladinian ~242–235 Ma PreꞒ Ꞓ O S D C P T J K Pg N
"Mastodonsaurus" torvus, an index fossil of the Bukobay Svita / Gorizont
Type	Stratigraphic Formation
Overlies	Donguz Svita
Lithology
Primary	Claystone, siltstone
Other	Sandstone
Location
Coordinates	51.4°N 55.5°E / 51.4; 55.5
Approximate paleocoordinates	35.4°N 41.0°E / 35.4; 41.0
Region	Orenburg, Bashkortostan
Country	Russia
Bukobay Svita (Russia)

Fossil content

Notable components of the Bukobay fauna include "Mastodonsaurus" torvus (a giant capitosaur amphibian), Malutinisuchus gratus and Energosuchus garjainovi, the insect Mesoneta uralensis, Elephantosaurus jachimovitschi (a large dicynodont), and Chalishevia cothurnata (the youngest known erythrosuchid). Temnospondyls include Bukobaja enigmatica, Cyclotosaurus, Plagioscutum caspiense and Plagiorophus paraboliceps, with Ceratodus orenburgensis and C. bucobaensis as fish. The flora is also diverse, including Equisetites arenaceus (a species of giant horsetails) and Ladinian-age palynomorphs.^[4][5]

See also

• Triassic land vertebrate faunachrons
• Erfurt Formation, contemporaneous fossiliferous formation of Germany
• Wetterstein Formation, contemporaneous fossiliferous formation of the Alps
• Omingonde Formation, contemporaneous fossiliferous formation of Namibia
• Santa Maria Formation, contemporaneous fossiliferous formation of Brazil

References

1. Bukobay Formation at Fossilworks.org
2. Bukobai Formation at Fossilworks.org
3. Bukobaiskaya Suite at Fossilworks.org
4. Tverdokhlebov et al., 2003
5. Tverdokhlebov et al., 2020

Bibliography

• Tverdokhlebov, V. P.; Sennikov, A. G.; Novikov, I. V.; Ilyina, N. V. (2020). "The Youngest Triassic Land Vertebrate Assemblage of Russia: Composition and Dating". Paleontological Journal. 54 (3): 297–310. Bibcode:2020PalJ...54..297T. doi:10.1134/S0031030120030156. S2CID 219958855.
• Tverdokhlebov, Valentin P.; Tverdokhlebova, Galina I.; Surkov, Mikhail V.; Benton, Michael J. (2003). "Tetrapod localities from the Triassic of the SE of European Russia". Earth-Science Reviews. 60 (1): 1–66. Bibcode:2003ESRv...60....1T. doi:10.1016/S0012-8252(02)00076-4.
• Schoch, R.; Milner, A. R. (2000). "Stereospondyli". Handbuch der Paläoherpetologie. 3B: 1–20.

Further reading

• I. A. Dobruskina. 1982. Triassic Floras of Eurasia. Akademia Nauk SSSR, Transactions 365:1-196