First Findings of Trace Fossils from the Tavda Formation (Middle–Upper Eocene) in the Southwestern Part of Western Siberia


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Trace fossils have been found for the first time in the Tavda Formation shallow marine facies, and their possible indicative value has been evaluated. The results of the ichnofossil study suggest that the Tavda Basin had low hydrodynamics. Under these conditions boreal and thetic waters of different characteristics were blended, which caused periodic formation of thermohaline water stratification and anoxic conditions in bottom water levels. Such periodic events conditioned mass extinctions of a wide variety of the Eocene marine biota thus preconditioning the development of freshwater fauna in the upper levels of the Tavda Sea along with saturation of the index beds of the Tavda Formation with micro- and macrofossils.

作者简介

I. Nesterov

Tyumen Industrial University

Email: geolog.08@mail.ru
俄罗斯联邦, Tyumen

Ya. Trubin

Tyumen Industrial University

Email: geolog.08@mail.ru
俄罗斯联邦, Tyumen

P. Smirnov

Tyumen Industrial University; Clausthal University of Technology

编辑信件的主要联系方式.
Email: geolog.08@mail.ru
俄罗斯联邦, Tyumen; Clausthal-Zellerfeld

P. Yan

Trofimuk Institute of Oil and gas geology and Geophysics, Siberian Branch

Email: geolog.08@mail.ru
俄罗斯联邦, Novosibirsk

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