PBDB Interval Range

453.2 - 449 Ma

International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Bolindian	Ashgill	Hirnantian			443.8
		Katian			Rawtheyan			445.2
					Cautleyan			448.9 *
			Eastonian		Cautleyan			449 *
					Pusgillian			449.3 *
				Caradoc	Streffordian	Onnian †		449.6 *
					Cheneyan			451.5 *
			Gisbornian		Cheneyan			452 *
					Burrellian			452.7 *
		Sandbian						453
						Actonian †		453.2 *
						Marshbrookian †	Woolstonian †	454.2 *
						Longvillian †		455.2 *
					Aurelucian	Longvillian †		456.8 *
					Aurelucian	Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian	Darriwilian		Abereiddian/Early Llanvirn			461.3 *
		Dapingian	Yapeenian		Abereiddian/Early Llanvirn			467.3
			Yapeenian	Arenig	Fennian			468.4 *
			Castlemainian					468.5 *
	Early Ordovician	Floian	Chewtonian					470
			Chewtonian		Whitlandian			471.1 *
			Bendigonian					471.8 *
			Lancefieldian					473.5 *
					Moridunian			474.3 *
		Tremadocian		Tremadoc	Migneintian			477.7
					Cressagian			480.8 *
			Warendian		Cressagian			482.8 *
			Warendian					485 *
								485.4