Huangnitang ({zh|s=黄泥塘|t=黃泥塘|p=Huángnítáng}) is a village in Zhejiang province, China. It is the location of the Global Boundary Stratotype Section and Point (GSSP), which marks the boundary between the Third and Darriwilian Stages of the Middle Ordovician. The GSSP was ratified by the International Union of Geological Sciences in 1
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