From latest Late Riphean through Vendian, stromatolites that occupied extensive intertidal zones of the Siberian basin became gradually extinct, giving way to a new type of bioherms as a result of critical biotic and abiotic effects during the span of 535–550 Ma BP. The Vendian-Cambrian bioherms consisted of calcareous algae and destructive bacteria (calcimicrobes) that colonized the intertidal zone of shallow-water shelf. The bacteria were responsible for most of the carbonate induction and lithification. Through the Vendian-Cambrian boundary (earliest Tommotian Stage), bioherms occupied far greater areas of the Siberian Platform than the Cambrian Sakha reef belt.
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