PBDB Interval Range

449.4 - 443.1 Ma

International Chronostratigraphic Timescale			Ordovician of China			Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Ashgill	Hirnantian			443.1
		Katian	Chientangkiangian				Rawtheyan			445.2
							Cautleyan			448.8
							Pusgillian			449.2
			Neichianshanian/Hanjiang				Pusgillian			449.4 *
						Caradoc	Streffordian	Onnian †		449.5
							Cheneyan			451.3
							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	Guniu †/Hulo		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.2
				Guniu †/Hulo			Abereiddian/Early Llanvirn			461.1
				Hunjiang †	Dawan †/Daobaowan/Ningkuo		Abereiddian/Early Llanvirn			466.6 *
						Arenig	Fennian			468
		Dapingian	Dapingian				Fennian			469.4
		Dapingian	Dapingian				Whitlandian			470.7
	Early Ordovician	Floian	Yiyangian				Whitlandian			471.3
		Floian	Yiyangian				Moridunian			473.8
		Tremadocian	Xinchangian			Tremadoc	Migneintian			477.1
					Lianghekou †		Migneintian			478.8 *
							Cressagian			481.1 *
										486.4 *
										486.85