Abstract
A new species of spheromorphic microfossils of Tasmanites with a characteristically thick cover is established in the Zavkhan association of algae, microfossils, and problematic Upper Vendian organisms from the upper part of the siliciclastic–carbonate section of the Tsagaanolom Formation (632 ± 14 Ma) of the Zavkhan Basin in western Mongolia. Representatives of this genus are widespread in the Phanerozoic beds and their accumulations are recorded in the Domanik facies and near hydrocarbon deposits.
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