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The regional stratotype section and point for the base of the Hirnantian Stage(the uppermost Ordovician) at Mirny Creek,Omulev Mountains,Northeast Russia
Hirnantian regional stratotype graptolites brachiopods NE Russia
2009/10/21
A complete Hirnantian sequence comprising the Normalograptus extraordinarius and N. persculptus biozones is well developed at the Mirny Creek section in the Omulev Mountains. The underlying beds are a...