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[dinosaur] Permian tetrapod fauna succession in Eastern Europe




Ben Creisler
bcreisler@gmail.com

In the new issue of Paleontological Journal, Russian edition (English translation of the issue is not out yet):



A.G. Sennikov & V.K. Golubev (2017)
The Succession of the Permian Tetrapod Fauna of Eastern Europe and the Permo-Triassic Ecological Crisis.
Paleontological Journal 51 (6): 30-41Â (Russian edition)
DOI: 10.7868/S0031031X17060022Â Â Â
https://elibrary.ru/item.asp?id=30502982


The most complete continuous section of the continental Permian and Triassic deposits in the world is represented in Eastern Europe. It makes it possible to trace the development of tetrapod faunas more than seventeen consecutive successive stages. The newly obtained data on transition Vyazniki and newly discovered Sundyr tetrapod faunas allow more precisely characterize the Late Guadelupian (Pre-Lopingian) and the End-Permian ecological crises and ways to replace the dominant vertebrate groups on the territory of Eastern Europe.

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M.A. Shishkin & I.V. Novikov (2017)
Early Stages of Recovery of the East European Tetrapod Fauna After the end-Permian crisis.
Paleontological Journal 51 (6): 42-52Â (Russian edition)
DOI: 10.7868/S0031031X17060034Â ÂÂ
https://elibrary.ru/item.asp?id=30502983

The succession of tetrapod communities which arose in Eastern Europe after the end-Permian mass extinction permits to recognize the three major evolutionary episodes discernible as the Tupilakosaurus fauna, Benthosuchus-Wetlugasaurus fauna and Parotosuchus fauna. Their age is estimated as the Induan, Early Olenekian and Late Olenekian respectively. Each of the faunas comprises two successive groupings, with some of these showing further subdivisions. In terms of its biochronological importance, the Late Induan tetrapod grouping is currently regarded as the most ambiguous. Presented are revised lists of the taxa that characterize the composition of the distinguished faunal units.

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ÂAbstract translation text is as posted on the Russian site:
Â
A. G. Ponomarenko (2017)
Terrestrial Ecology Around the P/T Border
Paleontological Journal 51 (6): 53-58Â (Russian edition)
DOI: 10.7868/S0031031X17060046Â Â
https://elibrary.ru/item.asp?id=30502984


P/T event is usually considered as the biggest mass extinction in the Earth history but the interpretation of event is quite different in the papers by paleontologists. The reason of crisis is usually considered eruption of Siberian traps but study of plants and insects from intertrappian deposits did not shown any such picture. Sedimentation of traps was very rapid and huge basaltian plateau was constructed for ecological not geological time. Representations about extinction are based on calculations of taxa, found in certain deposits, usually it is a stage. If evolution goes rapid both a diversity and extinction is strongly increased. Really, if for a stage existed 10 taxa replacing each other, and last has died out, both a diversity and extinction will be defined in 10 taxa though really existed and died one only. If for one stage has casually had lagerstÃtte, and on following it is not present, we will automatically receive at first peak of diversity, and then strong extinction. It is necessary to recognise, that the analysis diversity curvae was great achievement, but it is necessary to notice, that the appeared interesting new methods of the analysis are used absolutely insufficiently.

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