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
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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 127083 collections

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International Chronostratigraphic Timescale					Obsolete Precambrian Ages		Precambrian of Russia	Silurian of the Baltic	Devonian of Czechoslovakia	Ordovician of Australia	Cambrian of Britain		Permian of the Pamirs	Cambrian of China
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									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					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							Merioneth	Dolgellian/Trempealeauan		Niuchehean	Taoyuanian †	485.4
				Stage 10								Festiniogian		Niuchehean		489.2 *
				Jiangshanian								Festiniogian		Jiangshanian		489.5
				Jiangshanian								Maentwrogian		Jiangshanian		493.1 *
				Paibian										Paibian		494
				Paibian										Paibian	Waergangian †/Youshuanian	494.9 *
			Miaolingian	Guzhangian							St Davids			Guzhangian	Wangcunian †	497
				Drumian										Drumian	Wangcunian †	500.5
				Wuliuan										Wuliuan/Taijangian		504.5
			Series 2	Stage 4							Caerfai			Duyunian		509
Stage 3	Nangaoian		Series 2	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