Stratigraphy
Hirnantian
Belongs toUpper Ordovician
Typechronostratigraphy
RankStage
Original rankregional formation and stage
Scopeglobal
Statusformal standard
AuthorBancroft
Year1933
EtymonCwm Hirnant near Bala, in northern Wales
Age top (Ma)443.8
Age base (Ma)445.2
Date changed2022-11-04
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