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Identifies the Zittelihalobia zitteli Zone in Eastern Taimyr, indicating a significant Triassic boundary implication.
In Eastern Taimyr, bivalves suggested the establishment of the Zittelihalobia zitteli Zone, which appears to be of the same age as the Nathorstites tenuis Zone of boreal standard at the base of the Osipai Formation. The boundary between the Middle and Upper Triassic in Eastern Taimyr and in the northern Central Siberia is proposed to be drawn at the base of zitteli zone, which coincides with the beginning of the transgressive cycle.
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N. I. Kurushin (1991) studied this question.
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