Upper Ordovician
General info
Belongs to
Type chronostratigraphy
Rank Series
Scope global
Status formal standard
Age top (Ma) 443.8
Age base (Ma) 458.4
Index
O3
Alt. index
O3
Date added 2003-03-23
Date changed 2022-11-04
ReferenceContentYear1PagesRemarks
Gradstein et al., 2004
2004
Gradstein et al., 2012
2012
603-608
Goldman et al., 2020
2020
630-694