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
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 127057 collections

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International Chronostratigraphic Timescale					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						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