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Huangnitang Huangnitang () 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 1997. It was China's first. The boundary is defined as the first appearance of the graptolite ''Undulograptus austrodentatus''. The graptolite ''Arienigraptus zhejiangensis'' appears 0.5 m below this boundary. The rock section is shale. ==See also==
* List of villages in China
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Huangnitang」の詳細全文を読む
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