Type
Zone
Age range
454.7–453.7 Ma

International Timescale

Late Ordovician
Sandbian

Conodont Zonation

Phragmodus undatus
Belodina compressa
Erismodus quadridactylus
454.7454.6454.6454.6454.5454.4454.4454.4454.3454.3454.2454.1454.1454.1454.0453.9453.9453.9453.8453.8453.7

Macrostrat

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