The Paleobiology Database

Gradstein Cambrian-Middle Ordovician of Australasia

Interval	Maximum correlate	Minimum correlate	Ma

Yapeenian	Arenig
			468.9

Castlemainian	Arenig
			472

Chewtonian	Arenig
			473.9

Bendigonian	Arenig
			476.8

Lancefieldian	Tremadoc	Arenig


Warendian	Tremadoc
"pre-Lancefieldian"
			490

Datsonian	Mansian
			491.5

Payntonian	Ketyan
			494

Iverian	Yurakian	Ketyan
			498.5

Idamean	Tavgian	Ensyan
			501

Mindyallan	Nganasanian
possibly Tavgian in part
			503

Boomerangian	Mayan
			504

Undillan	Mayan
			505

Floran	Amgan
possibly Mayan in part
			507

Templetonian	Amgan
upper and lower boundaries not indicated; lower part could be partially Toyonian and upper part partially Mayan; lower boundary estimate is arbitrary
			510

Ordian	Toyonian
upper boundary not indicated; could be in the Amgan
			513

Authorizer: J. Alroy Enterer: J. Alroy

Continent: Australia Rank of each interval: age/stage

Basis of scale: paleontological

Comments: boundary age esimates based on Cooper 2004 next youngest stage is Darriwillian, which is treated as an international unit