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Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution.
- M. W. Martin, D. Grazhdankin, S. Bowring, D. Evans, M. Fedonkin, J. Kirschvink
- Geology, Environmental ScienceScience
- 5 May 2000
A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago, making co-occurring trace fossils the oldest that are reliably dated.
Ediacaran biota: The dawn of animal life in the shadow of giant protists
Abstract Functional, constructional, and preservational criteria led to a reinterpretation of seemingly complex trace fossils and the majority of assumed metazoan body fossils from Vendian…
Patterns of Evolution of the Ediacaran Soft-Bodied Biota
- D. Grazhdankin
- Environmental Science, Geography
- 1 April 2014
Abstract When each of the Avalon-, Ediacara-, and Nama-type fossil assemblages are tracked through geological time, there appear to be changes in species composition and diversity, almost…
Underground Vendobionta From Namibia
The late Precambrian fossils from Namibia have generally been regarded as soft‐bodied organisms whose three‐dimensional preservation resulted from smothering in fluidized sand. The sedimentological…
Carbonate-hosted Avalon-type fossils in arctic Siberia
- D. Grazhdankin, U. Balthasar, K. Nagovitsin, B. Kochnev
- Geography, Environmental Science
- 1 October 2008
Avalon-type fossils are crucial to understanding the origin of Phanerozoic ecosystems, but their usual occurrence in volcaniclastic and siliciclastic facies greatly limits their paleobiological…
Towards an ediacaran time scale: Problems, protocols, and prospects
The Ediacaran Period follows the Cryogenian Period in the wake of a snowball Earth glaciation and precedes the Cambrian Period with its rising tide of animal radiation. It is also the longest among…
Structure and Depositional Environment of the Vendian Complex in the Southeastern White Sea Area
- D. Grazhdankin
The subdivision and correlation scheme of the Vendian Complex is revised based on new data from outcrops along the eastern margin of the Baltic Shield (the southeastern White Sea area) and recently…
Late Vendian Miaohe-type ecological assemblage of the east European platform
Upper Vendian rocks of the East European Platform (EEP) are characterized by the presence of the White Sea fossil biota, which colonized the region from the southeastern White Sea area to the Central…
Ediacaran microbial colonies
There is no support from the fossil record for identifying a radiate ancestry for the Metazoa, and at least some Ediacaran discoids can be compared with extant concentric ring-shaped microbial colonies that grow in hypersaline microbial mats.
The oldest evidence of bioturbation on Earth
Detailed study of the Khatyspyt Formation in arctic Siberia has shown that, contrary to common expectations, the earliest ichnofabric is of late Ediacaran age, records a food-seeking behavior, and is…