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

Show more time

Show linear time

International Chronostratigraphic Timescale					Obsolete Precambrian Ages		Silurian of the Baltic	Devonian of Czechoslovakia	Ordovician of Australia	Cambrian of Britain		Permian of the Pamirs	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