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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 127967 collections

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International Chronostratigraphic Timescale					Ordovician of Britain				Cambrian of Kazakhstan	Ordovician of China			Ordovician of the Baltic				Carboniferous of North America	Devonian of France	Silurian Ages of Europe	Devonian of Germany
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian													Bursumian †				293.52
		Carboniferous	Pennsylvanian	Gzhelian													Virgilian				298.9
				Kasimovian													Missourian				303.7
				Kasimovian													Desmoinesian				305.9 *
				Moscovian													Desmoinesian				307
				Moscovian													Atokan				312.7 *
				Bashkirian													Atokan				315.2
				Bashkirian													Morrowan				318.4 *
			Mississippian	Serpukhovian													Chesterian				323.2
				Visean													Chesterian				330.9
																	Meramecian				335.8 *
																	Osagean				343.1 *
				Tournaisian													Osagean				346.7
				Tournaisian													Kinderhookian				351.9 *
		Devonian	Late Devonian	Famennian														Famennian		Wocklum/Dasberg/Hemberg/Nehden	358.9
			Late Devonian	Frasnian														Frasnian		Adorf	372.2
			Middle Devonian	Givetian														Givetian		Givetian	382.7
			Middle Devonian	Eifelian														Couvinien		Eifelian	387.7
			Early Devonian	Emsian																Emsian	393.3
				Pragian																Siegen	407.6
				Pragian														Coblencien		Siegen	408.2 *
				Lochkovian														Gedinnine		Gedinnine	410.8
		Silurian	Pridoli																		419.2
			Ludlow	Ludfordian																	423
			Ludlow	Gorstian																	425.6
			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	Ashgill	Hirnantian				Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni							443.8
				Katian		Rawtheyan				Chientangkiangian				Pirgu							445.2
						Cautleyan															448.9 *
						Pusgillian															449.3 *
						Pusgillian				Neichianshanian/Hanjiang											449.5
					Caradoc	Streffordian	Onnian †							Vormsi							449.6 *
														Nabala	Johvi †						450 *
													Viru	Rakvere							450.6 *
						Cheneyan								Rakvere							451.5 *
						Cheneyan								Oandu							452 *
						Burrellian								Oandu							452.7 *
				Sandbian										Keila	Idavere †						453
							Actonian †							Keila							453.2 *
							Actonian †							Haljala							453.9
							Marshbrookian †	Woolstonian †													454.2 *
							Longvillian †														455.2 *
														Kukruse							456.4 *
						Aurelucian															456.8 *
							Soudleyan †/Harnagian/Costonian														457.4 *
							Soudleyan †/Harnagian/Costonian							Uhaku	Aluoja †						457.5 *
			Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Darriwilian	Guniu †/Hulo			Uhaku							458.4
														Lasnamagi							458.9 *
														Aseri							460.4 *
						Abereiddian/Early Llanvirn								Aseri							461.3 *
													Oeland	Kunda							462.9 *
															Valaste †/Hunderum						464.3 *
											Hunjiang †	Dawan †/Daobaowan/Ningkuo									466.3 *
														Volkhov		Langevoja †/Vaana/Saka					467.1 *
				Dapingian						Dapingian											467.3
					Arenig	Fennian															468.4 *
														Billingen							469.3 *
			Early Ordovician	Floian						Yiyangian											470
															Latorp †						470.1 *
Whitlandian	471.1 *
Whitlandian	Hunneberg					473.7 *
Moridunian						474.3 *
Tremadocian				Tremadoc	Migneintian	Ungurian			Xinchangian	477.7
					Migneintian					Lianghekou †		477.9 *
					Cressagian							480.8 *
	Varangu											481.3 *
	Pakerort											482.2 *
												485 *
Cambrian		Furongian	Stage 10			Batyrbaian								485.4
														486.3 *
														486.5
			Jiangshanian											489.5
						Aksaian								490.7 *
						Sakian								492.2 *
			Paibian			Sakian								494
		Miaolingian	Guzhangian			Ayusokkanian								497
			Guzhangian											499.5
			Drumian			Zhanaarykian								500.5
			Drumian			Tuesaian								503
			Wuliuan			Tuesaian								504.5
			Wuliuan											505.3
		Series 2	Stage 4											509
						Toyonian								510 *
						Botomian								512.5 *
			Stage 3			Botomian								514
			Stage 3			Atdabanian								515.6 *
		Terreneuvian	Stage 2			Tommotian								521
			Stage 2											525.5
			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