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			Ordovician of Australia	Obsolete Names for ICS Units
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	Bolindian	Harju	Porkuni	443.8
		Katian		Rawtheyan			Pirgu	445.2
				Cautleyan				448.9 *
				Cautleyan	Eastonian			449 *
				Pusgillian				449.3 *
			Caradoc	Streffordian			Onnian †	Vormsi	449.6 *
								Nabala	Johvi †	450 *
						Viru		Rakvere		450.6 *
				Cheneyan				Rakvere		451.5 *
				Cheneyan	Gisbornian			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	Uhaku			458.4
								Lasnamagi			458.9 *
								Aseri			460.4 *
				Abereiddian/Early Llanvirn				Aseri			461.3 *
						Oeland		Kunda			462.9 *
								Kunda	Valaste †/Hunderum		464.3 *
								Volkhov			Langevoja †/Vaana/Saka		467.1 *
		Dapingian					Yapeenian						467.3
			Arenig	Fennian			Yapeenian						468.4 *
							Castlemainian						468.5 *
							Castlemainian	Billingen					469.3 *
	Early Ordovician	Floian					Chewtonian						470
									Latorp †				470.1 *
				Whitlandian									471.1 *
							Bendigonian						471.8 *
							Lancefieldian					473.5 *
								Hunneberg				473.7 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian								477.7
				Cressagian								480.8 *
								Varangu				481.3 *
								Pakerort				482.2 *
							Warendian					482.8 *
												Mansian †	483.55 *
												Mansian †	485 *
Cambrian	Furongian	Stage 10					Batyrbaian		Tavgian †			Ketyan †/Yurakian		485.4
														486.3 *
														486.5
		Jiangshanian												489.5
							Aksaian							490.7 *
							Sakian							492.2 *
		Paibian												494
		Paibian										Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian					Ayusokkanian							Series 3 †	497
		Guzhangian					Mayan/Menevian								499.5
		Drumian					Mayan/Menevian								500.5
		Wuliuan					Amgan/Solvan								Stage 5 †	504.5
	Series 2	Stage 4					Amgan/Solvan									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