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

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 128360 collections

Show more time

Show linear time

International Chronostratigraphic Timescale					Obsolete Precambrian Ages		Silurian of the Baltic	Devonian of Czechoslovakia	Ordovician of Australia	Devonian of France
Phanerozoic	Paleozoic	Devonian	Late Devonian	Famennian						Famennian	358.9
			Late Devonian	Frasnian						Frasnian	372.2
			Middle Devonian	Givetian				Srbsko		Givetian	382.7
			Middle Devonian	Eifelian				Chotec		Couvinien	387.7
			Early Devonian	Emsian				Daleje/Zlichovian			393.3
				Pragian				Pragian			407.6
				Pragian				Pragian		Coblencien	408.2 *
				Lochkovian				Lochkovian		Gedinnine	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							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 †	Poundian †					538.8
Proterozoic	Neoproterozoic	Ediacaran			Vendian †	Wonokan †					571.7 *
											635