Type
Zone
Age range
505.25–504.5 Ma

International Timescale

Miaolingian
Drumian
Wuliuan

Trilobite Zonation - Laurentia

Bolaspidella
Ptychagnostus gibbus
Ptychagnostus praecurrens
505.3505.2505.1505.1505.1505.0504.9504.9504.9504.8504.8504.7504.6504.6504.6504.5

Macrostrat

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