c. 491 Ma to 486.85 ± 1.5 Ma.

Cambrian-Ordovician boundary

The GSSP for the Cambrian-Ordovician boundary is at Green Point, western Newfoundland, Canada, and is dated at 486.85 Ma. It is defined by the appearance of the conodont Iapetognathus fluctivagus. Where these conodonts are not found the appearance of planktonic

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