PBDB Interval Range

477.7 - 467.1 Ma

International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Ashgill	Hirnantian			443.8
		Katian		Pirgu				Rawtheyan			445.2
								Cautleyan			448.9 *
								Pusgillian			449.3 *
				Vormsi			Caradoc	Streffordian	Onnian †		449.6 *
				Nabala	Johvi †						450 *
			Viru	Rakvere							450.6 *
				Rakvere				Cheneyan			451.5 *
				Oandu				Cheneyan			452 *
				Oandu				Burrellian			452.7 *
		Sandbian		Keila	Idavere †						453
				Keila					Actonian †		453.2 *
				Haljala					Actonian †		453.9
									Marshbrookian †	Woolstonian †	454.2 *
									Longvillian †		455.2 *
				Kukruse							456.4 *
								Aurelucian			456.8 *
									Soudleyan †/Harnagian/Costonian		457.4 *
				Uhaku	Aluoja †				Soudleyan †/Harnagian/Costonian		457.5 *
	Middle Ordovician	Darriwilian		Uhaku			Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
				Lasnamagi							458.9 *
				Aseri							460.4 *
				Aseri				Abereiddian/Early Llanvirn			461.3 *
			Oeland	Kunda							462.9 *
				Kunda	Valaste †/Hunderum						464.3 *
				Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian									467.3
							Arenig	Fennian			468.4 *
				Billingen							469.3 *
	Early Ordovician	Floian									470
					Latorp †						470.1 *
								Whitlandian			471.1 *
				Hunneberg				Whitlandian			473.7 *
								Moridunian			474.3 *
		Tremadocian					Tremadoc	Migneintian			477.7
								Cressagian			480.8 *
				Varangu							481.3 *
				Pakerort							482.2 *
				Pakerort							485 *
											485.4 *
											486.3
											486.5