Geologic Time Scale: Ordovician Period

The Ordovician Period

Katian Age/Stage

Late Ordovician: 453.0 to 445.2 million years ago

Sandian Age/Stage

Late Ordovician: 458.4 to 453.0 million years ago

Darriwilian Age/Stage

Middle Ordovician: 467.3 to 458.4 million years ago

Dapingian Age/Stage

Middle Ordovician: 470.0 to 467.3 million years ago

Floian Age/Stage

Early Ordovician: 477.7 to 470.0 million years ago

Tremadocian Age/Stage

Early Ordovician: 485.4 to 477.7 million years ago

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