The Global BoundaryStratotype Sectionand Point (GSSP) forthe base of theHirnantian Stage (theuppermost of theOrdovician System) Xu ChenRong JiayuJunxuan Fan2006 год

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System)
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