,The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the u

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The Global boundary Stratotype Section and Point (GSSP) for the base of the Hiantian Stage (the uppermost of the Ordovician System) is defined at a point 0.39m below the base of the Kuanyinchiao Bed in the Wangjiawan North section.
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