The Paleobiology Database

ammonites

Webby et al. Ordovician of Britain

Interval	Maximum correlate	Minimum correlate	Ma

Ashgill	middle Late Ordovician	late Late Ordovician
			449.5

Caradoc	early Late Ordovician	middle Late Ordovician
			460.5

Llanvirn	Darriwilian
			466

Arenig	late Early Ordovician	Darriwilian
			479

Tremadoc	Tremadocian
			490

Authorizer: J. Alroy Enterer: J. Alroy

Continent: Europe Rank of each interval: age/stage

Basis of scale: paleontological

Reference: B. D. Webby et al. 2004

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