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Ediacaran period overlaps, but is shorter than the Vendian period, a name that was earlier, in 1952, proposed by Russian geologist/paleontologist Boris Sokolov. The Vendian concept was formed stratigraphically top-down, and the lower boundary of the Cambrian became the upper boundary of the Vendian. Paleontological substantiation of this boundary was worked out separately for the siliciclastic basin (base of the Baltic Stage of the Eastern-European Platform ) and for the carbonate basin (base of the Tommotian Stage of the Siberian Platform ). Lower boundary of the Vendian was suggested to be defined at the base of the Varanger (Laplandian) tillites.

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  • Ediacaran
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  • Ediacaran period overlaps, but is shorter than the Vendian period, a name that was earlier, in 1952, proposed by Russian geologist/paleontologist Boris Sokolov. The Vendian concept was formed stratigraphically top-down, and the lower boundary of the Cambrian became the upper boundary of the Vendian. Paleontological substantiation of this boundary was worked out separately for the siliciclastic basin (base of the Baltic Stage of the Eastern-European Platform ) and for the carbonate basin (base of the Tommotian Stage of the Siberian Platform ). Lower boundary of the Vendian was suggested to be defined at the base of the Varanger (Laplandian) tillites.
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abstract
  • Ediacaran period overlaps, but is shorter than the Vendian period, a name that was earlier, in 1952, proposed by Russian geologist/paleontologist Boris Sokolov. The Vendian concept was formed stratigraphically top-down, and the lower boundary of the Cambrian became the upper boundary of the Vendian. Paleontological substantiation of this boundary was worked out separately for the siliciclastic basin (base of the Baltic Stage of the Eastern-European Platform ) and for the carbonate basin (base of the Tommotian Stage of the Siberian Platform ). Lower boundary of the Vendian was suggested to be defined at the base of the Varanger (Laplandian) tillites. The Vendian in its type area consists of large subdivisions such as Laplandian, Redkino, Kotlin and Rovno Regional stages with the globally traceable subdivisions and their boundaries, including its lower one. The Redkino, Kotlin and Rovno regional stages have been substantiated in the type area of the Vendian on the basis of the abundant organic-walled microfossils, megascopic algae, metazoan body fossils and ichnofossils. The lower boundary of the Vendian could have a biostratigraphic substantiation as well taking into consideration the worldwide occurrence of the Pertatataka assemblage of giant acantomorph acritarchs.
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