Type
Zone
Age range
507.3–506.6 Ma

International Timescale

Series 2
Stage 4

Trilobite Zonation - Laurentia

Ptychagnostus praecurrens
Albertella
Plagiura-Poliella
507.3507.3507.2507.1507.1507.1507.0506.9506.9506.9506.8506.8506.7506.6506.6

Macrostrat

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