PBDB Interval Range

448.8 - 443.1 Ma

International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Harju	Porkuni			443.1
		Katian		Rawtheyan				Pirgu			445.2
				Cautleyan							448.8
				Pusgillian							449.2
			Caradoc	Streffordian	Onnian †			Vormsi			449.5
								Nabala	Johvi †		449.9
							Viru	Rakvere			450.5
				Cheneyan				Rakvere			451.3
				Cheneyan				Oandu			451.8
				Burrellian				Oandu			452.5
		Sandbian						Keila	Idavere †		452.8
					Actonian †			Keila			453
					Actonian †			Haljala			453.9
					Marshbrookian †	Woolstonian †					454
					Longvillian †						455
				Aurelucian							456.6
								Kukruse			456.8
					Soudleyan †/Harnagian/Costonian			Kukruse			457.2
					Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †		458
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku			458.2
								Lasnamagi			459.7
				Abereiddian/Early Llanvirn				Lasnamagi			461.1
								Aseri			461.4
							Oeland	Kunda			464.3
									Valaste †/Hunderum		465.9 *
			Arenig	Fennian							468
								Volkhov		Langevoja †/Vaana/Saka	469.1 *
		Dapingian									469.4
		Dapingian		Whitlandian							470.7
	Early Ordovician	Floian						Billingen			471.3 *
									Latorp †		472.1 *
				Moridunian							473.8
				Moridunian				Hunneberg			475.6 *
		Tremadocian	Tremadoc	Migneintian							477.1
				Cressagian							481.1 *
								Varangu			482.9 *
								Pakerort			483.8 *
								Pakerort			486.4 *
											486.85