Type
Zone
Age range
456.6–455.8 Ma

International Timescale

Late Ordovician
Sandbian

Conodont Zonation

Erismodus quadridactylus
Plectodina aculeata
Cahabagnathus sweeti
456.6456.6456.5456.4456.4456.4456.3456.3456.2456.1456.1456.1456.0455.9455.9455.9455.8

Macrostrat

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