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 126844 collections

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International Chronostratigraphic Timescale					Obsolete Precambrian Ages		Silurian of the Baltic	Cambrian of Australia	Ordovician of Ibero-Bohemia				Obsolete Carboniferous Ages of China
Phanerozoic	Paleozoic	Carboniferous	Pennsylvanian	Gzhelian									Mapingian †	298.9
				Kasimovian									Mapingian †	303.7
				Kasimovian										305.9
				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										382.7
			Middle Devonian	Eifelian										387.7
			Early Devonian	Emsian										393.3
				Pragian										407.6
				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					Kosovian					443.8
				Katian					Kralodvorian	Bohdalec †				445.2
				Katian					Berounian					449.7 *
				Sandbian										453
											Zahorany †/Vinice	Letna †		456.2 *
										Liben †				458 *
			Middle Ordovician	Darriwilian										458.4
									Dobrotivian					458.5 *
									Oretanian					459.7 *
										Sarka †				461.7 *
				Dapingian						Klabava †				467.3
				Dapingian					Arenigian					468
			Early Ordovician	Floian					Arenigian					470
			Early Ordovician	Tremadocian					Tremadocian					477.7
		Cambrian	Furongian	Stage 10				Datsonian						485.4
				Stage 10				Payntonian						486.8 *
				Jiangshanian				Iverian						489.5
				Paibian				Idamean						494
			Miaolingian	Guzhangian				Mindyallan						497
				Guzhangian				Boomerangian						499
				Drumian				Undillan						500.5
				Drumian				Floran						503
				Wuliuan				Templetonian						504.5
				Wuliuan				Ordian						507.8 *
			Series 2	Stage 4				Ordian						509
				Stage 4										510.8 *
				Stage 3										514
			Terreneuvian	Stage 2										521
			Terreneuvian	Fortunian										529
Proterozoic	Neoproterozoic	Ediacaran			Vendian †	Poundian †								538.8
Proterozoic	Neoproterozoic	Ediacaran			Vendian †	Wonokan †								571.7 *
														635