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
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 127969 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Cambrian of Australia	Cambrian of China		Silurian Ages of Europe	Silurian of the Baltic
Silurian	Pridoli											Ohesaare	419.2
	Pridoli											Kaugetuma	421.7 *
	Ludlow	Ludfordian										Kuressaare	423
		Ludfordian										Paadla	423.4 *
		Gorstian										Paadla	425.6
	Wenlock	Homerian									Gleedonian	Rootsikula	427.4
											Gleedonian	Jaagarahu	429.2 *
											Whitwellian		429.7 *
		Sheinwoodian											430.5
		Sheinwoodian										Jaani	431.8 *
	Llandovery	Telychian										Jaani	433.4
		Telychian										Adavere	434 *
		Aeronian										Adavere	438.5
		Aeronian										Raikkula	439.4 *
		Rhuddanian										Raikkula	440.8
		Rhuddanian										Juuru	441.4 *
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						Datsonian	Niuchehean	Taoyuanian †			485.4
								Payntonian					486.8 *
								Payntonian					487.5
		Jiangshanian						Iverian	Jiangshanian				489.5
		Paibian						Idamean	Paibian				494
		Paibian						Idamean	Paibian	Waergangian †/Youshuanian			494.9 *
	Miaolingian	Guzhangian						Mindyallan	Guzhangian	Wangcunian †			497
		Guzhangian						Boomerangian	Guzhangian				499
		Drumian						Undillan	Drumian				500.5
		Drumian						Floran	Drumian				503
		Wuliuan						Templetonian	Wuliuan/Taijangian				504.5
		Wuliuan						Ordian	Wuliuan/Taijangian				507.8 *
	Series 2	Stage 4						Ordian	Duyunian				509
		Stage 4							Duyunian				510.8 *
		Stage 3							Nangaoian				514
	Terreneuvian	Stage 2							Meishucunian				521
		Fortunian							Meishucunian				529
		Fortunian							Jinnigian				530.7
													538.8