Type
Zone
Age range
447–445.5 Ma

International Timescale

Late Ordovician
Katian

Conodont Zonation

Aphelognathus shatzeri
Aphelognathus divergens
Aphelognathus grandis
447.0446.9446.8446.7446.6446.5446.4446.3446.2446.1446.0445.9445.8445.7445.6445.5

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