Type
Zone
Age range
520–518.5 Ma

International Timescale

Series 2
Stage 3

Trilobite Zonation - Laurentia

Nevadella
Fallotaspis
Fritzaspis
520.0519.9519.8519.7519.6519.5519.4519.3519.2519.1519.0518.9518.8518.7518.6518.5

Macrostrat

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