Type
Zone
Age range
449–447 Ma

International Timescale

Late Ordovician
Katian

Conodont Zonation

Aphelognathus divergens
Aphelognathus grandis
Oulodus robustus
449.0448.9448.8448.7448.6448.5448.4448.3448.2448.1448.0447.9447.8447.7447.6447.5447.4447.3447.2447.1447.0

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