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Well preserved and varied sphaeromorphs, filamentous trichomes and synaploid organic-walled microfossils occur in fine-grained clastics in the Měnín-1 borehole. Thirty genera with 40 species have been identified, previously known from Meso-and Neoproterozoic sediments. The Proterozoic microfossils are excellently preserved, not affected by post-diagenetic thermal alteration. The Vendian age is documented by the presence of the taxa Bavlinella faveolata

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