Type
Age
Age range
475–471.3 Ma

International Timescale

Middle Ordovician
Dapingian
Early Ordovician
Floian

North American Regional

Whiterock
Blackhillsian
Tulean
475.0474.8474.6474.4474.2474.0473.8473.6473.4473.2473.0472.8472.6472.4472.2472.0471.8471.6471.4471.2

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