Type
Zone
Age range
462.4–461.2 Ma

International Timescale

Middle Ordovician
Darriwilian

Conodont Zonation

Cahabagnathus sweeti
Cahabagnathus friendsvillensis
Phragmodus polonicus
462.4462.4462.4462.3462.3462.2462.1462.1462.1462.0461.9461.9461.9461.8461.8461.7461.6461.6461.6461.5461.4461.4461.4461.3461.3461.2461.1

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