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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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 127057 collections

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International Chronostratigraphic Timescale					Carboniferous of North America	Cambrian of Australia	Silurian of the Baltic	Devonian of Czechoslovakia	Ordovician of Australia	Cambrian of Britain		Permian of the Pamirs	Obsolete Precambrian Ages		Cambrian of China		Precambrian of Russia
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian								Dorashamian						251.902
			Lopingian	Wuchiapingian								Dzhulfian						254.14
			Guadalupian	Capitanian								Midian						259.51
				Wordian								Midian						264.28
				Wordian								Murgabian						266.2 *
				Roadian								Murgabian						266.9
			Cisuralian	Kungurian								Kubergandian						273.01
				Kungurian								Bolorian						279.8
				Artinskian								Bolorian						283.5
				Artinskian								Yakhtashian						286
				Sakmarian								Sakmarian						290.1
				Asselian	Bursumian †							Asselian						293.52
		Carboniferous	Pennsylvanian	Gzhelian	Virgilian													298.9
				Kasimovian	Missourian													303.7
				Kasimovian	Desmoinesian													305.9 *
				Moscovian	Desmoinesian													307
				Moscovian	Atokan													312.7 *
				Bashkirian	Atokan													315.2
				Bashkirian	Morrowan													318.4 *
			Mississippian	Serpukhovian	Chesterian													323.2
				Visean	Chesterian													330.9
					Meramecian													335.8 *
					Osagean													343.1 *
				Tournaisian	Osagean													346.7
				Tournaisian	Kinderhookian													351.9 *
		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				Ohesaare											419.2
			Pridoli				Kaugetuma											421.7 *
			Ludlow	Ludfordian			Kuressaare											423
				Ludfordian			Paadla											423.4 *
				Gorstian			Paadla											425.6
			Wenlock	Homerian			Rootsikula											427.4
				Homerian			Jaagarahu											429.2 *
				Sheinwoodian			Jaagarahu											430.5
				Sheinwoodian			Jaani											431.8 *
			Llandovery	Telychian			Jaani											433.4
				Telychian			Adavere											434 *
				Aeronian			Adavere											438.5
				Aeronian			Raikkula											439.4 *
				Rhuddanian			Raikkula											440.8
				Rhuddanian			Juuru											441.4 *
		Ordovician	Late Ordovician	Hirnantian					Bolindian									443.8
				Katian					Bolindian									445.2
									Eastonian									449 *
									Gisbornian									452 *
				Sandbian					Gisbornian									453
			Middle Ordovician	Darriwilian					Darriwilian									458.4
				Dapingian					Yapeenian									467.3
				Dapingian					Castlemainian									468.5 *
			Early Ordovician	Floian					Chewtonian									470
									Bendigonian									471.8 *
									Lancefieldian									473.5 *
				Tremadocian					Lancefieldian									477.7
				Tremadocian					Warendian									482.8 *
		Cambrian	Furongian	Stage 10		Datsonian				Merioneth	Dolgellian/Trempealeauan				Niuchehean	Taoyuanian †		485.4
						Payntonian					Dolgellian/Trempealeauan							486.8 *
						Payntonian					Festiniogian							489.2 *
				Jiangshanian		Iverian					Festiniogian				Jiangshanian			489.5
Maentwrogian	493.1 *			Jiangshanian		Iverian									Jiangshanian
	Paibian			Idamean		Paibian					494
	Paibian			Idamean		Paibian					Waergangian †/Youshuanian		494.9 *
Miaolingian	Guzhangian		Mindyallan	St Davids						Guzhangian	Wangcunian †		497
	Guzhangian		Boomerangian							Guzhangian			499
	Drumian		Undillan							Drumian			500.5
	Drumian		Floran							Drumian			503
	Wuliuan		Templetonian							Wuliuan/Taijangian			504.5
	Wuliuan		Ordian							Wuliuan/Taijangian			507.8 *
Series 2	Stage 4		Ordian	Caerfai						Duyunian			509
	Stage 4									Duyunian			510.8 *
	Stage 3									Nangaoian			514
Terreneuvian	Stage 2									Meishucunian		521
	Fortunian									Meishucunian		529
	Fortunian									Jinnigian		530.7
Proterozoic	Neoproterozoic	Ediacaran											Vendian †	Poundian †		Vendian	538.8
		Ediacaran											Vendian †	Wonokan †		Vendian	571.7 *
		Cryogenian															635
		Tonian															720
		Tonian														Karatau	800
	Mesoproterozoic	Stenian														Karatau	1000
		Stenian														Yurmatian	1100
		Ectasian														Yurmatian	1200
		Ectasian														Burzyan	1375
																		1400