Type
Zone
Age range
487.6–486.85 Ma

International Timescale

Early Ordovician
Tremadocian
Furongian
Stage 10

Trilobite Zonation - Laurentia

Symphysurina bulbosa
Symphysurina brevispicata
Missisquoia
487.6487.6487.5487.4487.4487.4487.3487.3487.2487.1487.1487.1487.0486.9486.9486.9

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