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 128254 collections

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International Chronostratigraphic Timescale					Ordovician of the Baltic				Permian of Western Europe	Silurian of England		Carboniferous of Western Europe		Obsolete Precambrian Ages		Ordovician of Britain				Cambrian of North America	Devonian of France
Phanerozoic	Paleozoic	Permian	Lopingian	Wuchiapingian					Zechstein													254.14
			Guadalupian	Capitanian					Rotliegendes													259.51
				Wordian																		264.28
				Roadian																		266.9
			Cisuralian	Kungurian																		273.01
				Artinskian					Autunian													283.5
				Sakmarian																		290.1
				Asselian																		293.52
				Asselian								Kuzel										297.7
		Carboniferous	Pennsylvanian	Gzhelian								Kuzel										298.9
												Stephanian	Stephanian C									300.3 *
													Stephanian B									300.9 *
													Stephanian A									301.4 *
				Kasimovian									Stephanian A									303.7
				Kasimovian									Cantabrian									305 *
				Moscovian									Cantabrian									307
												Westphalian	Westphalian D									307.4 *
													Westphalian C									309.8
													Westphalian B									314.6
				Bashkirian									Westphalian B									315.2
													Westphalian A									317 *
												Namurian	Yeadonian									318.8 *
													Marsdenian									320.2 *
													Kinderscoutian									321.5 *
													Alportian									322 *
													Chokierian									323.1 *
			Mississippian	Serpukhovian									Chokierian									323.2
													Arnsbergian									324 *
													Pendleian									327.4 *
				Visean								Warnantian	Brigantian †									330.9
												Livian	Asbian †									336.3 *
												Moliniacian	Holkerian †/Arundian/Chadian									340.2 *
				Tournaisian								Ivorian										346.7
				Tournaisian								Hastarian										353.7 *
		Devonian	Late Devonian	Famennian																	Famennian	358.9
			Late Devonian	Frasnian																	Frasnian	372.2
			Middle Devonian	Givetian																	Givetian	382.7
			Middle Devonian	Eifelian																	Couvinien	387.7
			Early Devonian	Emsian																		393.3
				Pragian																		407.6
				Pragian																	Coblencien	408.2 *
				Lochkovian																	Gedinnine	410.8
		Silurian	Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine											419.2
			Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Bringewood/Elton											421.3
			Ludlow	Ludfordian						Coalbrookdale	Wenlock (England)/Tickwood											423
				Gorstian																		425.6
				Gorstian							Buildwas											426.4 *
			Wenlock	Homerian							Buildwas											427.4
				Homerian						Wych	Woolhope											428.4 *
				Sheinwoodian																		430.5
			Llandovery	Telychian																		433.4
				Telychian																		436.3 *
				Aeronian																		438.5
				Aeronian						Cowleigh Park												439.3 *
				Rhuddanian						Cowleigh Park												440.8
		Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni										Ashgill	Hirnantian					443.8
				Katian		Pirgu											Rawtheyan					445.2
																	Cautleyan					448.9 *
																	Pusgillian					449.3 *
						Vormsi										Caradoc	Streffordian	Onnian †				449.6 *
						Nabala	Johvi †															450 *
					Viru	Rakvere																450.6 *
						Rakvere											Cheneyan					451.5 *
						Oandu											Cheneyan					452 *
Burrellian	452.7 *					Oandu
	Sandbian			Keila		Idavere †	453
				Keila			Actonian †	453.2 *
				Haljala			Actonian †	453.9
							Marshbrookian †	Woolstonian †						454.2 *
							Longvillian †							455.2 *
				Kukruse										456.4 *
Aurelucian														456.8 *
							Soudleyan †/Harnagian/Costonian							457.4 *
				Uhaku		Aluoja †	Soudleyan †/Harnagian/Costonian		457.5 *
Middle Ordovician	Darriwilian		Llanvirn	Uhaku			Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
				Lasnamagi										458.9 *
				Aseri										460.4 *
				Aseri			Abereiddian/Early Llanvirn							461.3 *
				Oeland	Kunda									462.9 *
					Kunda	Valaste †/Hunderum								464.3 *
					Volkhov									Langevoja †/Vaana/Saka	467.1 *
	Dapingian														467.3
			Arenig				Fennian								468.4 *
					Billingen										469.3 *
Early Ordovician	Floian														470
						Latorp †									470.1 *
							Whitlandian								471.1 *
					Hunneberg		Whitlandian								473.7 *
							Moridunian								474.3 *
	Tremadocian		Tremadoc				Migneintian								477.7
							Cressagian								480.8 *
					Varangu										481.3 *
					Pakerort										482.2 *
															485 *
Cambrian	Furongian	Stage 10													Franconian †/Dresbachian/Millardan	Datsonian	485.4
																	486.3 *
													486.5
													Payntonian			486.8 *
												Sunwaptan	Payntonian			487.5
		Jiangshanian										Sunwaptan	Iverian			489.5
		Jiangshanian										Steptoean	Iverian			493 *
		Paibian										Steptoean	Idamean			494
	Miaolingian	Guzhangian										Marjumian	Albertian †		Mindyallan	497
		Guzhangian													Boomerangian	499
		Drumian													Undillan	500.5
		Drumian													Floran	503
		Wuliuan										Topazan			Templetonian	504.5
												Delamaran			Templetonian	506.5
															Ordian	507.8 *
	Series 2	Stage 4											Waucoban †		Ordian	509
																510.8 *
												Dyeran				511 *
		Stage 3										Dyeran				514
												Montezuman				514.8 *
												Begadean				519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
Proterozoic	Neoproterozoic	Ediacaran											Vendian †			Poundian †			Vendian	538.8
		Ediacaran											Vendian †			Wonokan †			Vendian	571.7 *
		Cryogenian																	635
		Tonian																	720
		Tonian														Karatau			800
	Mesoproterozoic	Stenian														Karatau			1000
		Stenian														Yurmatian			1100
		Ectasian														Yurmatian			1200
		Ectasian														Burzyan			1375
																						1400