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 126764 collections

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International Chronostratigraphic Timescale					Devonian Subages	Precambrian of Russia	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	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								419.2
			Ludlow	Ludfordian							423
			Ludlow	Gorstian							425.6
			Wenlock	Homerian							427.4
			Wenlock	Sheinwoodian							430.5
			Llandovery	Telychian							433.4
				Aeronian							438.5
				Rhuddanian							440.8
		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							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