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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 Siberia			Ten Million Year Bins	Obsolete Names for ICS Units					Cambrian of North America		Cambrian Epochs
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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian		Rawtheyan		Chientangkiangian			445.2
				Cautleyan					448.9 *
				Pusgillian					449.3 *
				Pusgillian		Neichianshanian/Hanjiang			449.5
			Caradoc	Streffordian					Onnian †	449.6 *
				Cheneyan						451.5 *
				Burrellian						452.7 *
		Sandbian			Ordovician 4					453
									Actonian †	453.2 *
									Marshbrookian †	Woolstonian †	454.2 *
									Longvillian †		455.2 *
				Aurelucian					Longvillian †		456.8 *
				Aurelucian					Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn		Ordovician 3	Darriwilian		Guniu †/Hulo		458.4
				Abereiddian/Early Llanvirn					Guniu †/Hulo		461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo		466.3 *
		Dapingian				Ordovician 2	Dapingian				467.3
		Dapingian	Arenig	Fennian			Dapingian				468.4 *
	Early Ordovician	Floian		Fennian			Yiyangian				470
				Whitlandian							471.1 *
				Moridunian							474.3 *
		Tremadocian	Tremadoc	Migneintian		Ordovician 1	Xinchangian				477.7
				Migneintian					Lianghekou †		477.9 *
				Cressagian							480.8 *
				Cressagian							Mansian †		483.55 *
											Mansian †		485 *
Cambrian	Furongian	Stage 10				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Cambrian 5					Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10														Sunwaptan	487.5
		Jiangshanian															489.5
						Aksaian											490.7 *
						Sakian											492.2 *
																Steptoean	493 *
		Paibian															494
		Paibian						Ensyan †/Maduan/Nganasanian									494.7 *
	Miaolingian	Guzhangian				Ayusokkanian			Cambrian 4			Series 3 †		Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian				Mayan/Menevian											499.5
		Drumian				Mayan/Menevian											500.5
		Wuliuan				Amgan/Solvan			Cambrian 3					Stage 5 †			Topazan	504.5
		Wuliuan												Stage 5 †			Delamaran	506.5
	Series 2	Stage 4													Waucoban †	Early Cambrian		509
						Toyonian	Lenian †											510 *
						Toyonian											Dyeran	511 *
						Botomian												512.5 *
		Stage 3							Cambrian 2									514
																	Montezuman	514.8 *
						Atdabanian											Montezuman	515.6 *
						Atdabanian											Begadean	519.9 *
	Terreneuvian	Stage 2				Tommotian												521
		Stage 2				Nemakit-Daldynian												525.5
		Fortunian				Nemakit-Daldynian	Manykaian †		Cambrian 1									529
																			538.8