Stratigraphy
Katian
Belongs toUpper Ordovician
Typechronostratigraphy
RankStage
Scopeglobal
Statusformal standard
Year2003
EtymonKaty Lake, Oklahoma, USA
Original localityBlack Knob Ridge outcrop
Age top (Ma)445.2
Age base (Ma)453
Date added2003-04-02
Date changed2022-11-04
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