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Hirnantian

Hirnantian

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奥陶纪末赫南特期(Hirnantian)以北非为中心的大陆冰川形成,全球海平面大幅下降,凉浅水海域广泛分布,底栖无脊椎动物群与前 …

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (Upper Ordovician ) is defined at a point 0 .

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