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Intervals
Macrostrat
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Fritzaspis
517
Type
Zone
Age range
521–520
Ma
International Timescale
Series 2
Stage 3
Terreneuvian
Stage 2
Trilobite Zonation - Laurentia
Fallotaspis
Fritzaspis
Wyattia
521.0
521.0
520.9
520.9
520.8
520.8
520.7
520.6
520.6
520.5
520.5
520.5
520.4
520.4
520.3
520.3
520.2
520.1
520.1
520.0
520.0
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