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
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				Cambrian of Kazakhstan	Ordovician of the Baltic				Obsolete Names for ICS Units			Ordovician of China			Cambrian of North America		Cambrian Epochs
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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian		Rawtheyan		Pirgu	Chientangkiangian			445.2
				Cautleyan						448.9 *
				Pusgillian						449.3 *
				Pusgillian			Neichianshanian/Hanjiang			449.5
			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			Darriwilian	Guniu †/Hulo		Uhaku				458.4
										Lasnamagi				458.9 *
										Aseri				460.4 *
				Abereiddian/Early Llanvirn						Aseri				461.3 *
					Oeland					Kunda				462.9 *
											Valaste †/Hunderum			464.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
										Volkhov				Langevoja †/Vaana/Saka	467.1 *
		Dapingian					Dapingian								467.3
			Arenig	Fennian											468.4 *
										Billingen					469.3 *
	Early Ordovician	Floian					Yiyangian								470
											Latorp †				470.1 *
				Whitlandian											471.1 *
				Whitlandian						Hunneberg					473.7 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian			Ungurian						Xinchangian		477.7
				Migneintian					Lianghekou †						477.9 *
				Cressagian											480.8 *
										Varangu					481.3 *
										Pakerort					482.2 *
															485 *
Cambrian	Furongian	Stage 10					Batyrbaian								Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
																	486.3 *
																	486.5
																	Sunwaptan	487.5
		Jiangshanian																489.5
							Aksaian											490.7 *
							Sakian											492.2 *
																	Steptoean	493 *
		Paibian															Steptoean	494
	Miaolingian	Guzhangian					Ayusokkanian								Series 3 †	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian																	499.5
		Drumian					Zhanaarykian												500.5
		Drumian					Tuesaian												503
		Wuliuan					Tuesaian									Stage 5 †			Topazan	504.5
																			Topazan	505.3
																			Delamaran	506.5
	Series 2	Stage 4															Waucoban †	Early Cambrian		509
							Toyonian													510 *
							Toyonian												Dyeran	511 *
							Botomian													512.5 *
		Stage 3																		514
																			Montezuman	514.8 *
							Atdabanian												Montezuman	515.6 *
							Atdabanian												Begadean	519.9 *
	Terreneuvian	Stage 2					Tommotian													521
		Stage 2																		525.5
		Fortunian																		529
																					538.8