Type
Zone
Age range
479.8–477.5 Ma

International Timescale

Early Ordovician
Tremadocian

Conodont Zonation

Oepikodus communis
Acodus delatus/Oneotodus costatus
Macerodus dianae
479.9479.8479.7479.6479.5479.4479.3479.2479.1479.0478.9478.8478.7478.6478.5478.4478.3478.2478.1478.0477.9477.8477.7477.6477.5477.4

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