1047 2020-11-20T15:33:30.517Z Gradstein et al. (2012) 77 Ordovicien moyen false Middle Ordovician o3-4 Middle Ordovician true Monde Ordovicien moyen 126 180 ORDM h.bressan@brgm.fr Hélène Bressan 2019-03-25T13:21:08.963Z Ordovicien moyen 2019-03-25T13:23:22.963Z 10 Middle Ordovician 2020-11-20T15:35:45.957Z 2022-12-08T06:53:54.224Z