Middle Ordovician
General info
Belongs to
Ordovician
Type chronostratigraphy
Rank Series
Scope global
Status informal standard
Age top (Ma) 458.4
Age base (Ma) 470
Index
O2
Alt. index
O2
Date added 2003-03-23
Date changed 2022-11-04
References (2)Sub units (2)Related units (1)Specimens (22952)Samples (7056)
ReferenceContentYear1PagesRemarks
Gradstein et al., 2004
2004
Goldman et al., 2020
2020
630-694
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