Middle Ordovician
General info
Belongs to
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
ReferenceContentYear1PagesRemarks
Goldman et al., 2020
2020
630-694
Gradstein et al., 2004
2004