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| details | Arenigian | China(Hopei) | Wang,X et al. The Huanghuachang section, near Yichang, China, proposed as global stratotype for the base of the Middle Ordovician Series. | 2002 | |
| details | Middle Ordovician | China(Hopei) | Wang,X. et al. The Huanghuachang Section, potential as Global Stratotype for the base of the Middle Ordovician Series. (In: Ordovician from the Andes. G.L.Albanesi,M.S.Beresi,S.H.Peralta,editors) | 2003 |