Type
Zone
Age range
421.2–419 Ma

International Timescale

Early Devonian
Lochkovian
Pridoli

Conodont Zonation

Caudicriodus hesperius
Oulodus elegans detortus
Ozarkodina eosteinhornensis
421.2421.1421.0420.9420.8420.7420.6420.5420.4420.3420.2420.1420.0419.9419.8419.7419.6419.5419.4419.3419.2419.1419.0

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