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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of China		Ordovician of Ibero-Bohemia				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	Kosovian	Harju	Porkuni	443.8
		Katian		Rawtheyan	Kralodvorian		Bohdalec †	Pirgu	445.2
				Cautleyan					448.9 *
				Pusgillian					449.3 *
			Caradoc	Streffordian				Onnian †	Vormsi	449.6 *
					Berounian				Vormsi	449.7 *
									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 *
												Zahorany †/Vinice	Letna †		456.2 *
									Kukruse						456.4 *
				Aurelucian											456.8 *
								Soudleyan †/Harnagian/Costonian							457.4 *
									Uhaku	Aluoja †					457.5 *
							Liben †								458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn											458.4
					Dobrotivian										458.5 *
					Dobrotivian				Lasnamagi						458.9 *
					Oretanian				Lasnamagi						459.7 *
									Aseri						460.4 *
				Abereiddian/Early Llanvirn											461.3 *
							Sarka †								461.7 *
						Oeland			Kunda						462.9 *
									Kunda	Valaste †/Hunderum					464.3 *
									Volkhov						Langevoja †/Vaana/Saka	467.1 *
		Dapingian					Klabava †									467.3
					Arenigian											468
			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	Tremadocian										477.7
				Cressagian											480.8 *
									Varangu						481.3 *
									Pakerort						482.2 *
															485 *
Cambrian	Furongian	Stage 10			Niuchehean					Taoyuanian †							485.4
																	486.3 *
																	486.5
		Jiangshanian			Jiangshanian												489.5
		Paibian			Paibian												494
		Paibian			Paibian					Waergangian †/Youshuanian							494.9 *
	Miaolingian	Guzhangian			Guzhangian					Wangcunian †							Series 3 †	497
		Drumian			Drumian					Wangcunian †								500.5
		Wuliuan			Wuliuan/Taijangian													Stage 5 †	504.5
	Series 2	Stage 4			Duyunian														509
	Series 2	Stage 3			Nangaoian														514
	Terreneuvian	Stage 2			Meishucunian														521
		Fortunian			Meishucunian														529
		Fortunian			Jinnigian														530.7
																				538.8