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

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 127682 collections

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International Chronostratigraphic Timescale					Ordovician of Ibero-Bohemia				Devonian Subages	Carboniferous of China	Permian of Western Europe	Precambrian of Russia	Silurian of the Baltic
Phanerozoic	Paleozoic	Permian	Lopingian	Wuchiapingian							Zechstein			254.14
			Guadalupian	Capitanian							Rotliegendes			259.51
				Wordian										264.28
				Roadian										266.9
			Cisuralian	Kungurian										273.01
				Artinskian							Autunian			283.5
				Sakmarian										290.1
				Asselian										293.52
		Carboniferous	Pennsylvanian	Gzhelian										298.9
				Gzhelian						Xiaodushanian				300 *
				Kasimovian						Xiaodushanian				303.7
				Kasimovian						Dalaun				305.8 *
				Moscovian										307
				Bashkirian										315.2
										Huashibanian				318.5 *
										Lousuan				321.2 *
			Mississippian	Serpukhovian						Dewunian				323.2
				Serpukhovian						Shangsian				330.8 *
				Visean						Shangsian				330.9
				Visean						Jiusian				335 *
				Tournaisian						Tangbagouan				346.7
		Devonian	Late Devonian	Famennian					Late Famennian					358.9
									Middle Famennian					365.3 *
									Early Famennian					368.5 *
				Frasnian					Late Frasnian					372.2
									Middle Frasnian					375.4 *
									Early Frasnian					379.3 *
			Middle Devonian	Givetian					Late Givetian					382.7
									Middle Givetian					383.7 *
									Early Givetian					385.9 *
				Eifelian					Late Eifelian					387.7
				Eifelian					Early Eifelian					390.3 *
			Early Devonian	Emsian					Late Emsian					393.3
				Emsian					Early Emsian					398.3 *
				Pragian					Pragian					407.6
				Lochkovian					Late Lochkovian					410.8
									Middle Lochkovian					412.8 *
									Early Lochkovian					415.6 *
		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
Arenigian	468			Dapingian
Arenigian	Early Ordovician		Floian	470
Tremadocian	Early Ordovician		Tremadocian		477.7
Cambrian	Furongian	Stage 10			485.4
		Jiangshanian			489.5
		Paibian			494
	Miaolingian	Guzhangian			497
		Drumian			500.5
		Wuliuan			504.5
	Series 2	Stage 4			509
	Series 2	Stage 3			514
	Terreneuvian	Stage 2			521
	Terreneuvian	Fortunian			529
Proterozoic	Neoproterozoic	Ediacaran									Vendian	538.8
		Cryogenian										635
		Tonian										720
		Tonian									Karatau	800
	Mesoproterozoic	Stenian									Karatau	1000
		Stenian									Yurmatian	1100
		Ectasian									Yurmatian	1200
		Ectasian									Burzyan	1375
														1400