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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is fossil range of |