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 126764 collections

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International Chronostratigraphic Timescale					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				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					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