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				Ordovician of Ibero-Bohemia				Cambrian of Siberia			Cambrian of Britain		Obsolete Names for ICS Units						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	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 *
															Mansian †	483.55 *
															Mansian †	485 *
Cambrian	Furongian	Stage 10								Batyrbaian					Tavgian †	Ketyan †/Yurakian	Merioneth	Dolgellian/Trempealeauan	Late Cambrian	485.4
																				486.3 *
																				486.5
																		Festiniogian		489.2 *
		Jiangshanian																		489.5
										Aksaian										490.7 *
										Sakian										492.2 *
																		Maentwrogian		493.1 *
		Paibian																		494
		Paibian														Ensyan †/Maduan/Nganasanian				494.7 *
	Miaolingian	Guzhangian								Ayusokkanian							St Davids		Series 3 †	Middle Cambrian	497
		Guzhangian								Mayan/Menevian											499.5
		Drumian								Mayan/Menevian											500.5
		Wuliuan								Amgan/Solvan											Stage 5 †	504.5
	Series 2	Stage 4								Amgan/Solvan							Caerfai				Early Cambrian	509
										Toyonian					Lenian †							510 *
										Botomian												512.5 *
		Stage 3								Botomian												514
		Stage 3								Atdabanian												515.6 *
	Terreneuvian	Stage 2								Tommotian												521
		Stage 2								Nemakit-Daldynian												525.5
		Fortunian								Nemakit-Daldynian					Manykaian †							529
																							538.8