Type
Zone
Age range
437.5–436.4 Ma

International Timescale

Llandovery
Telychian

Conodont Zonation

Pterospathodus amorphognathoides angulatus
Pterospathodus eopennatus
Distomodus staurognathoides
437.5437.4437.4437.4437.3437.3437.2437.1437.1437.1437.0436.9436.9436.9436.8436.8436.7436.6436.6436.6436.5436.4436.4

Macrostrat

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