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Environmental Control on Biotic Development in Siberia (Verkhoyansk Region) and Neighbouring Areas During Permian-Triassic Large Igneous Province Activity

Zakharov, Yuri D.; Biakov, Alexander S.; Horacek, Micha; Kutygin, Ruslan V.; Sobolev, Evgeny S.; Bond, David P.G.

Authors

Yuri D. Zakharov

Alexander S. Biakov

Micha Horacek

Ruslan V. Kutygin

Evgeny S. Sobolev

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David Bond D.Bond@hull.ac.uk
Palaeoenvironmental Scientist and Schools Liason Officer



Contributors

Jean Guex
Editor

John S. Torday
Editor

William B. Miller Jr.
Editor

Abstract

We propose an updated ammonoid zonation for the Permian-Triassic boundary succession (the lower Nekuchan Formation) in the Verkhoyansk region of Siberia: (1) Otoceras concavum zone (uppermost Changhsingian); (2) Otoceras boreale zone (lowermost Induan); (3) Tompophiceras morpheous zone (lower Induan); and (4) Wordieoceras decipiens zone (lower Induan). The Tompophiceras pascoei zone, previously defined between the Otoceras boreale and Tompophiceras morpheous zones, is removed in our scheme. Instead of this the Tompophiceras pascoei epibole zone is proposed for the lower part of the Tompophiceras morpheous zone. New and previously published nitrogen isotope records are interpreted as responses to climatic fluctuations in the middle to higher palaeolatitudes of Northeastern Asia and these suggest a relatively cool climatic regime for the Boreal Superrealm; however the trend towards warming across the Permian-Triassic boundary transition is also seen. The evolutionary development and geographical differentiation of otoceratid ammonoids and associated groups are considered. It is likely that the Boreal Superrealm was their main refugium, where otocerid, dzhulfitid and some other ammonoids survived the major biotic crisis at the end of the Permian. The similarity of ontogenetic development of suture lines of Otoceras woodwardi Griesbach and O. boreale Spath gives some grounds for suggesting a monophyletic origin of the genus Otoceras, having bipolar distribution.

Citation

Zakharov, Y. D., Biakov, A. S., Horacek, M., Kutygin, R. V., Sobolev, E. S., & Bond, D. P. (2020). Environmental Control on Biotic Development in Siberia (Verkhoyansk Region) and Neighbouring Areas During Permian-Triassic Large Igneous Province Activity. In J. Guex, J. S. Torday, & W. B. Miller Jr. (Eds.), Morphogenesis, Environmental Stress and Reverse Evolution (197-231). Cham: Springer. https://doi.org/10.1007/978-3-030-47279-5_10

Online Publication Date Jul 24, 2020
Publication Date Jul 24, 2020
Deposit Date Mar 31, 2023
Publisher Springer
Pages 197-231
Book Title Morphogenesis, Environmental Stress and Reverse Evolution
ISBN 9783030472818; 9783030472788
DOI https://doi.org/10.1007/978-3-030-47279-5_10
Keywords Permian–Triassic transition; South Verkhoyansk; Molluscs; N-isotopes
Public URL https://hull-repository.worktribe.com/output/4254605