PBDB Interval Range

450.1 - 443.1 Ma

International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Kosovian				Ashgill	Hirnantian			443.1
		Katian	Kralodvorian	Bohdalec †				Rawtheyan			445.2
								Cautleyan			448.8
								Pusgillian			449.2
							Caradoc	Streffordian	Onnian †		449.5
			Berounian					Streffordian			450.1 *
								Cheneyan			451.3
								Burrellian			452.5
		Sandbian									452.8
									Actonian †		453
									Marshbrookian †	Woolstonian †	454
									Longvillian †		455
								Aurelucian	Longvillian †		456.6
									Soudleyan †/Harnagian/Costonian		457.2
					Zahorany †/Vinice	Letna †			Soudleyan †/Harnagian/Costonian		457.3 *
	Middle Ordovician	Darriwilian			Zahorany †/Vinice		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.2
				Liben †							459.3 *
			Dobrotivian								459.7 *
			Oretanian								461 *
								Abereiddian/Early Llanvirn			461.1
				Sarka †				Abereiddian/Early Llanvirn			463.3 *
			Arenigian	Sarka †			Arenig	Fennian			468
		Dapingian		Klabava †				Fennian			469.4
		Dapingian						Whitlandian			470.7
	Early Ordovician	Floian						Whitlandian			471.3
		Floian						Moridunian			473.8
		Tremadocian	Tremadocian				Tremadoc	Migneintian			477.1
							Tremadoc	Cressagian			481.1 *
											486.4 *
											486.85