Type
Zone
Age range
443.1–441.1 Ma

International Timescale

Llandovery
Rhuddanian
Late Ordovician
Hirnantian

Conodont Zonation

Aspelunda expansa
Distomodus kentuckyensis
Aphelognathus shatzeri
443.1443.0442.9442.8442.7442.6442.5442.4442.3442.2442.1442.0441.9441.8441.7441.6441.5441.4441.3441.2441.1

Macrostrat

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