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Research identifies full representation of Norian and Rhaetian stages in northern Middle Siberia, suggesting refined stratigraphic accuracy.
On the basis of new data chiefly on bivalve mollusks the Norian and Rhaetian stages are shown to be represented to a full extent in the northern part of Middle Siberia. The major cross sections and paleontologic characteristics are given. Subzones are distinguished according to bivalve mollusks. A more exact stratigraphic scheme is compiled for the Upper Triassic deposits.
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Kazakov et al. (1992) studied this question.
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