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 126762 collections

Show more time

Show linear time

International Chronostratigraphic Timescale					Obsolete Precambrian Ages		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							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							443.8
				Katian							445.2
				Sandbian							453
			Middle Ordovician	Darriwilian							458.4
			Middle Ordovician	Dapingian							467.3
			Early Ordovician	Floian							470
			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 †	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