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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 126844 collections

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International Chronostratigraphic Timescale					Ordovician of North America					Silurian Ages of Europe	Precambrian of Russia
Phanerozoic	Paleozoic	Silurian	Wenlock	Homerian						Gleedonian		427.4
				Homerian						Whitwellian		429.7 *
				Sheinwoodian								430.5
			Llandovery	Telychian								433.4
				Aeronian								438.5
				Rhuddanian								440.8
		Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian						443.8
				Katian		Gamachian						445.2
						Richmondian						446 *
						Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					449.8 *
						Edenian						450.4 *
					Mohawkian	Chatfieldian						451.1 *
				Sandbian		Chatfieldian						453
						Turinian						453.7 *
					Whiterockian		Canadian †	Chazyan †/Marmor				457 *
			Middle Ordovician	Darriwilian								458.4
				Dapingian								467.3
				Dapingian		Rangerian						469.1 *
			Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †			470
				Floian		Tulean						473.9 *
				Tremadocian		Tulean						477.7
						Stairsian						480.3 *
						Skullrockian			Demingian †			482 *
		Cambrian	Furongian	Stage 10		Skullrockian						485.4
				Stage 10								487.5
				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