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	Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Carboniferous	Pennsylvanian	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										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 †	Poundian †							538.8
Proterozoic	Neoproterozoic	Ediacaran			Vendian †	Wonokan †							571.7 *
													635