PBDB Interval Range

453 - 449 Ma

International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Bolindian	Ashgill	Hirnantian			443.1
		Katian			Rawtheyan			445.2
					Cautleyan			448.8
			Eastonian		Cautleyan			449 *
					Pusgillian			449.2
				Caradoc	Streffordian	Onnian †		449.5
					Cheneyan			451.3
			Gisbornian		Cheneyan			452.3 *
					Burrellian			452.5
		Sandbian						452.8
						Actonian †		453
						Marshbrookian †	Woolstonian †	454
						Longvillian †		455
					Aurelucian	Longvillian †		456.6
					Aurelucian	Soudleyan †/Harnagian/Costonian		457.2
	Middle Ordovician	Darriwilian	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.2
				Llanvirn	Abereiddian/Early Llanvirn			461.1
				Arenig	Fennian			468
		Dapingian	Yapeenian					469.4
			Castlemainian					470.3
			Castlemainian		Whitlandian			470.7
	Early Ordovician	Floian	Chewtonian					471.3
			Bendigonian					473.1
			Bendigonian		Moridunian			473.8
			Lancefieldian		Moridunian			474.9
		Tremadocian		Tremadoc	Migneintian			477.1
					Cressagian			481.1 *
			Warendian		Cressagian			484.3
			Warendian					486.4 *
								486.85