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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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.

This timescale is used in the definition of 126844 collections

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International Chronostratigraphic Timescale					Devonian Subages	Permian of the Pamirs	Carboniferous Subepochs	Precambrian of Russia
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian		Dorashamian			251.902
			Lopingian	Wuchiapingian		Dzhulfian			254.14
			Guadalupian	Capitanian		Midian			259.51
				Wordian		Midian			264.28
				Wordian		Murgabian			266.2 *
				Roadian		Murgabian			266.9
			Cisuralian	Kungurian		Kubergandian			273.01
				Kungurian		Bolorian			279.8
				Artinskian		Bolorian			283.5
				Artinskian		Yakhtashian			286
				Sakmarian		Sakmarian			290.1
				Asselian		Asselian			293.52
		Carboniferous	Pennsylvanian	Gzhelian			Late Pennsylvanian		298.9
				Kasimovian			Late Pennsylvanian		303.7
				Moscovian			Middle Pennsylvanian		307
				Bashkirian			Early Pennsylvanian		315.2
			Mississippian	Serpukhovian			Late Mississippian		323.2
				Visean			Middle Mississippian		330.9
				Tournaisian			Early Mississippian		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					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	538.8
		Cryogenian							635
		Tonian							720
		Tonian						Karatau	800
	Mesoproterozoic	Stenian						Karatau	1000
		Stenian						Yurmatian	1100
		Ectasian						Yurmatian	1200
		Ectasian						Burzyan	1375
									1400