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
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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 128152 collections

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International Chronostratigraphic Timescale					Cambrian of Siberia			Devonian Subages	Cambrian Epochs	Carboniferous Subepochs	Precambrian of Russia
Phanerozoic	Paleozoic	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
				Tremadocian								477.7
				Tremadocian	Mansian †							483.55 *
		Cambrian	Furongian	Stage 10	Batyrbaian	Tavgian †	Ketyan †/Yurakian		Late Cambrian			485.4
				Jiangshanian	Batyrbaian							489.5
					Aksaian							490.7 *
					Sakian							492.2 *
				Paibian								494
				Paibian			Ensyan †/Maduan/Nganasanian					494.7 *
			Miaolingian	Guzhangian	Ayusokkanian				Middle Cambrian			497
				Guzhangian	Mayan/Menevian							499.5
				Drumian	Mayan/Menevian							500.5
				Wuliuan	Amgan/Solvan							504.5
			Series 2	Stage 4	Amgan/Solvan				Early Cambrian			509
					Toyonian	Lenian †						510 *
					Botomian							512.5 *
				Stage 3	Botomian							514
				Stage 3	Atdabanian							515.6 *
			Terreneuvian	Stage 2	Tommotian							521
				Stage 2	Nemakit-Daldynian							525.5
				Fortunian	Nemakit-Daldynian	Manykaian †						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