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Wang BX, Stouge S, Maletz J, Bagnoli G, Qi Y, Raevskaya EG, Wang C, , Yan C.  The Xiaoyangqiao section, Dayangcha, North China: the new global Auxiliary Boundary Stratotype Section and Point (ASSP) for the base of the Ordovician System.  Episodes 2021;44:359-383.  https://doi.org/10.18814/epiiugs/2020/020091