Type
Zone
Age range
439.4–437.5 Ma

International Timescale

Llandovery
Telychian
Aeronian

Conodont Zonation

Pterospathodus eopennatus
Distomodus staurognathoides
Pterospathodus tenuis
439.4439.3439.2439.1439.0438.9438.8438.7438.6438.5438.4438.3438.2438.1438.0437.9437.8437.7437.6437.5

Macrostrat

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