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

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of China		Ordovician of China			Cambrian of Kazakhstan	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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Bolindian	Harju	Porkuni	443.8
		Katian		Rawtheyan	Chientangkiangian					Pirgu	445.2
				Cautleyan							448.9 *
				Cautleyan				Eastonian			449 *
				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				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		Guniu †/Hulo		Darriwilian	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				Yapeenian						467.3
			Arenig	Fennian						Yapeenian						468.4 *
										Castlemainian						468.5 *
										Castlemainian	Billingen					469.3 *
	Early Ordovician	Floian				Yiyangian				Chewtonian						470
												Latorp †				470.1 *
				Whitlandian											471.1 *
										Bendigonian					471.8 *
										Lancefieldian					473.5 *
											Hunneberg				473.7 *
				Moridunian											474.3 *
		Tremadocian	Tremadoc	Migneintian		Xinchangian									Ungurian	477.7
				Migneintian				Lianghekou †								477.9 *
				Cressagian												480.8 *
											Varangu					481.3 *
											Pakerort					482.2 *
										Warendian						482.8 *
										Warendian						485 *
Cambrian	Furongian	Stage 10				Niuchehean	Taoyuanian †								Batyrbaian		485.4
																	486.3 *
																	486.5
		Jiangshanian				Jiangshanian											489.5
															Aksaian		490.7 *
															Sakian		492.2 *
		Paibian				Paibian											494
		Paibian				Paibian	Waergangian †/Youshuanian										494.9 *
	Miaolingian	Guzhangian				Guzhangian	Wangcunian †								Ayusokkanian		Series 3 †	497
		Guzhangian				Guzhangian												499.5
		Drumian				Drumian									Zhanaarykian			500.5
		Drumian				Drumian									Tuesaian			503
		Wuliuan				Wuliuan/Taijangian									Tuesaian			Stage 5 †	504.5
		Wuliuan				Wuliuan/Taijangian												Stage 5 †	505.3
	Series 2	Stage 4				Duyunian													509
															Toyonian				510 *
															Botomian				512.5 *
		Stage 3				Nangaoian									Botomian				514
		Stage 3				Nangaoian									Atdabanian				515.6 *
	Terreneuvian	Stage 2				Meishucunian									Tommotian				521
		Stage 2																	525.5
		Fortunian																	529
		Fortunian				Jinnigian													530.7
																				538.8