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

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				Ten Million Year Bins	Ordovician of China			Cambrian of Britain		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														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														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 †	Bolindian	443.8
		Katian		Rawtheyan		Chientangkiangian				445.2
				Cautleyan						448.9 *
				Cautleyan					Eastonian	449 *
				Pusgillian						449.3 *
				Pusgillian		Neichianshanian/Hanjiang				449.5
			Caradoc	Streffordian						Onnian †	449.6 *
				Cheneyan							451.5 *
				Cheneyan					Gisbornian		452 *
				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	Darriwilian		458.4
				Abereiddian/Early Llanvirn					Guniu †/Hulo			461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo			466.3 *
		Dapingian				Ordovician 2	Dapingian			Yapeenian		467.3
			Arenig	Fennian						Yapeenian		468.4 *
										Castlemainian		468.5 *
	Early Ordovician	Floian					Yiyangian			Chewtonian		470
				Whitlandian						Chewtonian		471.1 *
										Bendigonian		471.8 *
										Lancefieldian		473.5 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian		Ordovician 1	Xinchangian					477.7
				Migneintian					Lianghekou †			477.9 *
				Cressagian								480.8 *
				Cressagian						Warendian		482.8 *
										Warendian		485 *
Cambrian	Furongian	Stage 10				Cambrian 5				Merioneth		Dolgellian/Trempealeauan	Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
												Dolgellian/Trempealeauan			Sunwaptan	487.5
												Festiniogian				489.2 *
		Jiangshanian														489.5
															Steptoean	493 *
												Maentwrogian				493.1 *
		Paibian										Maentwrogian				494
	Miaolingian	Guzhangian				Cambrian 4				St Davids			Marjumian	Albertian †	Middle Cambrian	497
		Drumian				Cambrian 4							Marjumian			500.5
		Wuliuan				Cambrian 3							Topazan			504.5
		Wuliuan											Delamaran			506.5
	Series 2	Stage 4								Caerfai			Delamaran	Waucoban †	Early Cambrian	509
		Stage 4											Dyeran			511 *
		Stage 3				Cambrian 2							Dyeran			514
													Montezuman			514.8 *
													Begadean			519.9 *
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian				Cambrian 1										529
																538.8