PBDB Interval

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 126679 collections

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International Chronostratigraphic Timescale					Ordovician of Britain				Cambrian of Kazakhstan	Obsolete Precambrian Ages		Permian of the Pamirs	Ordovician of the Baltic			Carbo-Permian of the Russian Platform	Permian of the Russian Platform		Obsolete Names for ICS Units
Phanerozoic	Cenozoic	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
	Mesozoic	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
	Paleozoic	Permian	Lopingian	Changhsingian								Dorashamian				Melekhovian					251.902
				Wuchiapingian								Dzhulfian								Longtanian †	254.14
				Wuchiapingian								Dzhulfian					Tatarian	Vyatkian		Longtanian †	256.8 *
			Guadalupian	Capitanian								Midian						Severodvinian			259.51
				Wordian														Urzhumian			264.28
																Noginskian					264.9 *
												Murgabian									266.2 *
				Roadian													Kazanian	Povolzhian			266.9
				Roadian													Kazanian	Sokian			270.7 *
			Cisuralian	Kungurian								Kubergandian					Kungurian	Irenian/Ufimian			273.01
																		Filipovian			276.5 *
																Pavlovoposadian					276.8 *
												Bolorian									279.8
																		Saraninian			280.1 *
				Artinskian													Artinskian	Sarginian			283.5
																		Irginian			285.9 *
												Yakhtashian									286
Rusavkinian					287.6 *
					Burtsevian	287.8 *
				Sakmarian	Sakmarian	Sakmarian	Sterlitamakian	290.1
				Sakmarian	Sakmarian	Sakmarian	Tastubian	291.7 *
				Asselian	Asselian	Asselian	Shikhanian	293.52
							Uskalykian	294.8
							Surenian	297.5
		Carboniferous	Pennsylvanian	Gzhelian				298.9
Kasimovian				Dorogomilovian				303.7
				Khamovnikian				304.8
				Krevyakinian				305.8 *
Moscovian				Myachkovian				307
				Podolskian				308.9 *
				Kashirian				311.4 *
				Vereian				313.8
				Melekessian				314.8
Bashkirian				Melekessian				315.2
				Cheremshanian				316.9 *
				Prikamian				318.6 *
				Severokeltmian				319.9 *
				Krasnopolyanian				321.2 *
				Voznesenian				321.9 *
Mississippian			Serpukhovian	Zapaltjubian				323.2
				Protvian				324.4 *
				Steshevian				326.8 *
				Tarusian				329 *
			Visean	Venevian				330.9
				Mikhailovian				331.9 *
				Aleksinian				333.7 *
				Tulian				335.8 *
				Bobrikian				339.9 *
				Radaevkian				343.4 *
			Tournaisian	Kosvian				346.7
				Kizelian				350.7 *
				Cherepetian				351.9 *
				Karakubian				354.4 *
				Upinian				356.3 *
				Malevkian				357.6 *
				Gumerovian				358 *
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	Harju	Porkuni	443.8
		Katian						Rawtheyan		Pirgu	445.2
								Cautleyan			448.9 *
								Pusgillian			449.3 *
			Caradoc					Streffordian		Onnian †	Vormsi	449.6 *
											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 *
											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		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										467.3
			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							Ungurian	477.7
					Cressagian								480.8 *
									Varangu				481.3 *
									Pakerort				482.2 *
													485 *
Cambrian	Furongian	Stage 10								Batyrbaian			485.4
													486.3 *
													486.5
		Jiangshanian											489.5
										Aksaian			490.7 *
										Sakian			492.2 *
		Paibian								Sakian			494
	Miaolingian	Guzhangian								Ayusokkanian			Series 3 †	497
		Guzhangian												499.5
		Drumian								Zhanaarykian				500.5
		Drumian		Tuesaian						503
		Wuliuan		Tuesaian						Stage 5 †				504.5
		Wuliuan								Stage 5 †				505.3
	Series 2	Stage 4												509
				Toyonian										510 *
				Botomian										512.5 *
		Stage 3		Botomian										514
		Stage 3		Atdabanian										515.6 *
	Terreneuvian	Stage 2		Tommotian										521
		Stage 2												525.5
		Fortunian												529
Proterozoic	Neoproterozoic	Ediacaran													Vendian †	Poundian †	538.8
Proterozoic	Neoproterozoic	Ediacaran													Vendian †	Wonokan †	571.7 *
																					635