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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Ten Million Year Bins	Cambrian of Australia	Cambrian Epochs	Obsolete Names for ICS Units			Ordovician of the Baltic
Quaternary	Holocene	Meghalayan						Cenozoic 6										0
		Northgrippian																0.0042
		Greenlandian																0.0082
	Pleistocene	Late Pleistocene																0.0117
		Chibanian																0.129
		Calabrian																0.774
		Gelasian																1.8
Neogene	Pliocene	Piacenzian									Tertiary †							2.58
	Pliocene	Zanclean																3.6
	Miocene	Messinian																5.333
		Tortonian																7.246
		Serravallian						Cenozoic 5										11.63
		Langhian																13.82
		Burdigalian																15.98
		Aquitanian																20.44
Paleogene	Oligocene	Chattian						Cenozoic 4										23.03
	Oligocene	Rupelian						Cenozoic 4										27.82
	Eocene	Priabonian						Cenozoic 3										33.9
		Bartonian						Cenozoic 3										37.71
		Lutetian						Cenozoic 2										41.2
		Ypresian						Cenozoic 2										47.8
	Paleocene	Thanetian						Cenozoic 1										56
		Selandian																59.2
		Danian																61.6
Cretaceous	Late Cretaceous	Maastrichtian						Cretaceous 8										66
		Campanian						Cretaceous 7										72.1
		Santonian						Cretaceous 6										83.6
		Coniacian																86.3
		Turonian																89.8
		Cenomanian						Cretaceous 5										93.9
	Early Cretaceous	Albian						Cretaceous 4										100.5
		Aptian						Cretaceous 3										113
		Barremian						Cretaceous 2										121.4
		Hauterivian						Cretaceous 2										125.77
		Valanginian						Cretaceous 1										132.6
		Berriasian						Cretaceous 1										139.8
Jurassic	Late Jurassic	Tithonian						Jurassic 6										145
		Kimmeridgian						Jurassic 5										149.2
		Oxfordian																154.8
	Middle Jurassic	Callovian																161.5
		Bathonian						Jurassic 4										165.3
		Bajocian						Jurassic 4										168.2
		Aalenian						Jurassic 3										170.9
	Early Jurassic	Toarcian						Jurassic 3										174.7
		Pliensbachian						Jurassic 2										184.2
		Sinemurian						Jurassic 1										192.9
		Hettangian						Jurassic 1										199.5
Triassic	Late Triassic	Rhaetian						Triassic 4										201.4
		Norian						Triassic 4										208.5
		Carnian						Triassic 3										227
	Middle Triassic	Ladinian						Triassic 2										237
	Middle Triassic	Anisian						Triassic 2										242
	Early Triassic	Olenekian						Triassic 1										247.2
	Early Triassic	Induan						Triassic 1										251.2
Permian	Lopingian	Changhsingian						Permian 4										251.902
	Lopingian	Wuchiapingian										Longtanian †						254.14
	Guadalupian	Capitanian																259.51
		Wordian																264.28
		Roadian						Permian 3										266.9
	Cisuralian	Kungurian						Permian 2										273.01
		Artinskian																283.5
		Sakmarian																290.1
		Asselian						Permian 1										293.52
Carboniferous	Pennsylvanian	Gzhelian						Carboniferous 5										298.9
		Kasimovian	303.7					Carboniferous 5
		Moscovian	Carboniferous 4	307
		Bashkirian	Carboniferous 4	315.2
	Mississippian	Serpukhovian	Carboniferous 3	323.2
		Visean	Carboniferous 2	330.9
		Tournaisian	Carboniferous 1	346.7
Devonian	Late Devonian	Famennian	Devonian 5	358.9
	Late Devonian	Frasnian	Devonian 4	372.2
	Middle Devonian	Givetian	Devonian 3	382.7
	Middle Devonian	Eifelian	Devonian 3	387.7
	Early Devonian	Emsian	Devonian 2	393.3
		Pragian	Devonian 1	407.6
		Lochkovian	Devonian 1	410.8
Silurian	Pridoli		Silurian 2	419.2
	Ludlow	Ludfordian		423
	Ludlow	Gorstian		425.6
	Wenlock	Homerian		427.4
	Wenlock	Sheinwoodian		430.5
	Llandovery	Telychian	Silurian 1	433.4
		Aeronian		438.5
		Rhuddanian		440.8
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian	Ordovician 5	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			Ordovician 4			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			Ordovician 3	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					Ordovician 2						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			Ungurian						Ordovician 1	477.7
				Cressagian								480.8 *
								Varangu				481.3 *
								Pakerort				482.2 *
												485 *
Cambrian	Furongian	Stage 10					Batyrbaian		Cambrian 5			Datsonian	Late Cambrian		485.4
															486.3 *
															486.5
												Payntonian			486.8 *
		Jiangshanian										Iverian			489.5
							Aksaian								490.7 *
							Sakian								492.2 *
		Paibian					Sakian					Idamean			494
	Miaolingian	Guzhangian					Ayusokkanian		Cambrian 4			Mindyallan	Middle Cambrian		Series 3 †	497
							Ayusokkanian					Boomerangian				499
												Boomerangian				499.5
		Drumian					Zhanaarykian					Undillan				500.5
		Drumian					Tuesaian					Floran				503
		Wuliuan					Tuesaian		Cambrian 3			Templetonian				Stage 5 †	504.5
												Templetonian					505.3
												Ordian					507.8 *
	Series 2	Stage 4											Early Cambrian				509
							Toyonian										510 *
							Toyonian										510.8 *
							Botomian										512.5 *
		Stage 3					Botomian		Cambrian 2								514
		Stage 3					Atdabanian										515.6 *
	Terreneuvian	Stage 2					Tommotian										521
		Stage 2															525.5
		Fortunian							Cambrian 1								529
																		538.8