Type
Age
Age range
479.5–475 Ma

International Timescale

Early Ordovician
Floian
Tremadocian

North American Regional

Blackhillsian
Tulean
Stairsian
479.6479.4479.2479.0478.8478.6478.4478.2478.0477.8477.6477.4477.2477.0476.8476.6476.4476.2476.0475.8475.6475.4475.2475.0474.8

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