Whiterock – Macrostrat

Type

Age

Age range

471.3–456.5 Ma

International Timescale

Late Ordovician

Sandbian

Middle Ordovician

Darriwilian

Dapingian

Early Ordovician

Floian

COSUNA

Rocklandian

Whiterock

Blackriverian

Chazyan

Arenigian

North American Regional

Mohawkian

Whiterock

Blackhillsian

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