Type
Zone
Age range
461.2–456.6 Ma

International Timescale

Late Ordovician
Sandbian
Middle Ordovician
Darriwilian

Conodont Zonation

Plectodina aculeata
Cahabagnathus sweeti
Cahabagnathus friendsvillensis
461.4461.2461.0460.8460.6460.4460.2460.0459.8459.6459.4459.2459.0458.8458.6458.4458.2458.0457.8457.6457.4457.2457.0456.8456.6456.4

Macrostrat

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