PBDB Timescale

Ordovician of Britain

The interval definitions in this timescale are derived from the following sources:

F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view

There are 14 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Obsolete Names for ICS Units			Ordovician of the Baltic
Neogene	Pliocene	Piacenzian					Tertiary †							2.58
	Pliocene	Zanclean												3.6
	Miocene	Messinian												5.333
		Tortonian												7.246
		Serravallian												11.63
		Langhian												13.82
		Burdigalian												15.98
		Aquitanian												20.44
Paleogene	Oligocene	Chattian												23.03
	Oligocene	Rupelian												27.82
	Eocene	Priabonian												33.9
		Bartonian												37.71
		Lutetian												41.2
		Ypresian												47.8
	Paleocene	Thanetian												56
		Selandian												59.2
		Danian												61.6
Cretaceous	Late Cretaceous	Maastrichtian												66
		Campanian												72.1
		Santonian												83.6
		Coniacian												86.3
		Turonian												89.8
		Cenomanian												93.9
	Early Cretaceous	Albian												100.5
		Aptian												113
		Barremian												121.4
		Hauterivian												125.77
		Valanginian												132.6
		Berriasian												139.8
Jurassic	Late Jurassic	Tithonian												145
		Kimmeridgian												149.2
		Oxfordian												154.8
	Middle Jurassic	Callovian												161.5
		Bathonian												165.3
		Bajocian												168.2
		Aalenian												170.9
	Early Jurassic	Toarcian												174.7
		Pliensbachian												184.2
		Sinemurian												192.9
		Hettangian												199.5
Triassic	Late Triassic	Rhaetian												201.4
		Norian												208.5
		Carnian												227
	Middle Triassic	Ladinian												237
	Middle Triassic	Anisian												242
	Early Triassic	Olenekian												247.2
	Early Triassic	Induan												251.2
Permian	Lopingian	Changhsingian												251.902
	Lopingian	Wuchiapingian						Longtanian †						254.14
	Guadalupian	Capitanian												259.51
		Wordian												264.28
		Roadian												266.9
	Cisuralian	Kungurian												273.01
		Artinskian												283.5
		Sakmarian												290.1
		Asselian												293.52
Carboniferous	Pennsylvanian	Gzhelian												298.9
		Kasimovian												303.7
		Moscovian												307
		Bashkirian												315.2
	Mississippian	Serpukhovian												323.2
		Visean												330.9
		Tournaisian												346.7
Devonian	Late Devonian	Famennian												358.9
	Late Devonian	Frasnian	372.2
	Middle Devonian	Givetian	382.7
	Middle Devonian	Eifelian	387.7
	Early Devonian	Emsian	393.3
		Pragian	407.6
		Lochkovian	410.8
Silurian	Pridoli		419.2
	Ludlow	Ludfordian	423
	Ludlow	Gorstian	425.6
	Wenlock	Homerian	427.4
	Wenlock	Sheinwoodian	430.5
	Llandovery	Telychian	433.4
		Aeronian	438.5
		Rhuddanian	440.8
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian	Harju	Porkuni			443.8
		Katian		Rawtheyan		Pirgu			445.2
				Cautleyan					448.9 *
				Pusgillian			449.3 *
			Caradoc	Streffordian		Onnian †	Vormsi		449.6 *
							Nabala		Johvi †	450 *
					Viru		Rakvere			450.6 *
				Cheneyan			Rakvere			451.5 *
				Cheneyan			Oandu			452 *
				Burrellian			Oandu			452.7 *
		Sandbian					Keila		Idavere †	453
						Actonian †	Keila			453.2 *
						Actonian †	Haljala			453.9
						Marshbrookian †				Woolstonian †	454.2 *
						Longvillian †					455.2 *
							Kukruse				456.4 *
				Aurelucian							456.8 *
						Soudleyan †/Harnagian/Costonian					457.4 *
						Soudleyan †/Harnagian/Costonian	Uhaku		Aluoja †		457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Uhaku				458.4
							Lasnamagi				458.9 *
							Aseri				460.4 *
				Abereiddian/Early Llanvirn			Aseri				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 *
				Whitlandian			Hunneberg					473.7 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian								477.7
				Cressagian				480.8 *
							Varangu	481.3 *
							Pakerort	482.2 *
								485 *
Cambrian	Furongian	Stage 10							485.4
									486.3 *
									486.5
		Jiangshanian							489.5
		Paibian							494
	Miaolingian	Guzhangian							Series 3 †			497
		Drumian										500.5
		Wuliuan										Stage 5 †	504.5
														509