PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

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, 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

There are 59 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 126973 collections

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International Chronostratigraphic Timescale					Ordovician of Australia	Obsolete Precambrian Ages		Ordovician of China			Devonian of Czechoslovakia	Permian of the Salt Range	Cretaceous Subepochs	Ordovician of Britain
Phanerozoic	Mesozoic	Cretaceous	Late Cretaceous	Maastrichtian									Senonian				66
				Campanian													72.1
				Santonian													83.6
				Coniacian													86.3
				Turonian													89.8
				Cenomanian													93.9
			Early Cretaceous	Albian									Gallic				100.5
				Aptian													113
				Barremian													121.4
				Hauterivian									Neocomian				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
				Induan													251.2
				Induan								Kathwai					251.5 *
	Paleozoic	Permian	Lopingian	Changhsingian								Kathwai					251.902
																	252.4 *
												Chhidru					252.9 *
				Wuchiapingian								Chhidru					254.14
												Kalabagh					255 *
												Wargal					256 *
			Guadalupian	Capitanian													259.51
				Wordian													264.28
																	265.3 *
												Amb					266.1 *
				Roadian								Amb					266.9
				Roadian													270.7 *
			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							Srbsko						382.7
			Middle Devonian	Eifelian							Chotec						387.7
			Early Devonian	Emsian							Daleje/Zlichovian						393.3
				Pragian							Pragian						407.6
				Lochkovian							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	Bolindian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Ashgill	Hirnantian	443.8
			Katian		Chientangkiangian				Rawtheyan	445.2
									Cautleyan	448.9 *
				Eastonian					Cautleyan	449 *
									Pusgillian	449.3 *
					Neichianshanian/Hanjiang				Pusgillian	449.5
								Caradoc	Streffordian	Onnian †				449.6 *
									Cheneyan				451.5 *
				Gisbornian					Cheneyan				452 *
									Burrellian				452.7 *
			Sandbian										453
										Actonian †			453.2 *
										Marshbrookian †			Woolstonian †	454.2 *
										Longvillian †				455.2 *
									Aurelucian	Longvillian †				456.8 *
									Aurelucian	Soudleyan †/Harnagian/Costonian				457.4 *
		Middle Ordovician	Darriwilian	Darriwilian	Darriwilian	Guniu †/Hulo		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn					458.4
						Guniu †/Hulo			Abereiddian/Early Llanvirn					461.3 *
						Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
			Dapingian	Yapeenian	Dapingian									467.3
				Yapeenian				Arenig	Fennian					468.4 *
				Castlemainian										468.5 *
		Early Ordovician	Floian	Chewtonian	Yiyangian									470
				Chewtonian					Whitlandian					471.1 *
				Bendigonian										471.8 *
				Lancefieldian										473.5 *
	Moridunian								474.3 *
	Tremadocian		Xinchangian		Tremadoc			Migneintian	477.7
							Lianghekou †	Migneintian	477.9 *
								Cressagian	480.8 *
				Warendian				Cressagian	482.8 *
				Warendian					485 *
Cambrian	Furongian	Stage 10							485.4
		Jiangshanian							489.5
		Paibian							494
	Miaolingian	Guzhangian							497
		Drumian							500.5
		Wuliuan							504.5
	Series 2	Stage 4							509
	Series 2	Stage 3							514
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian							529
Proterozoic	Neoproterozoic	Ediacaran												Vendian †	Poundian †	538.8
Proterozoic	Neoproterozoic	Ediacaran												Vendian †	Wonokan †	571.7 *
																	635