Type
Zone
Age range
440.5–439.4 Ma

International Timescale

Llandovery
Aeronian
Rhuddanian

Conodont Zonation

Distomodus staurognathoides
Pterospathodus tenuis
Aspelunda expansa
440.5440.4440.4440.4440.3440.3440.2440.1440.1440.1440.0439.9439.9439.9439.8439.8439.7439.6439.6439.6439.5439.4439.4

Macrostrat

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