The Paleobiology Database

Webby et al. Ordovician of North America

Interval	Maximum correlate	Minimum correlate	Ma

Cincinnatian	Caradoc	Ashgill
			452.5

Mohawkian	Caradoc
			457.5

Whiterockian	Arenig	Caradoc
			472

Ibexian	Tremadoc	Arenig
base shown as going somewhere into the Cambrian, so base estimate is a minimum
			490

Authorizer: J. Alroy Enterer: J. Alroy

Continent: North America Rank of each interval: epoch/series

Basis of scale: paleontological