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
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 128338 collections

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International Chronostratigraphic Timescale					Ordovician of North America						Ordovician of the Baltic				Obsolete Precambrian Ages		Carbo-Permian of the Russian Platform	Permian of Western Europe	Devonian of Germany	Devonian of Eastern North America
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian													Melekhovian					251.902
			Lopingian	Wuchiapingian														Zechstein				254.14
			Guadalupian	Capitanian														Rotliegendes				259.51
				Wordian																		264.28
				Wordian													Noginskian					264.9 *
				Roadian																		266.9
			Cisuralian	Kungurian																		273.01
				Kungurian													Pavlovoposadian					276.8 *
				Artinskian													Pavlovoposadian	Autunian				283.5
				Artinskian													Rusavkinian					287.6 *
				Sakmarian																		290.1
				Asselian																		293.52
		Carboniferous	Pennsylvanian	Gzhelian																		298.9
				Kasimovian													Dorogomilovian					303.7
																	Khamovnikian					304.8
																	Krevyakinian					305.8 *
				Moscovian													Myachkovian					307
																	Podolskian					308.9 *
																	Kashirian					311.4 *
																	Vereian					313.8
																	Melekessian					314.8
				Bashkirian													Melekessian					315.2
																	Cheremshanian					316.9 *
																	Prikamian					318.6 *
																	Severokeltmian					319.9 *
																	Krasnopolyanian					321.2 *
																	Voznesenian					321.9 *
			Mississippian	Serpukhovian													Zapaltjubian					323.2
																	Protvian					324.4 *
																	Steshevian					326.8 *
																	Tarusian					329 *
				Visean													Venevian					330.9
																	Mikhailovian					331.9 *
																	Aleksinian					333.7 *
																	Tulian					335.8 *
																	Bobrikian					339.9 *
																	Radaevkian					343.4 *
				Tournaisian													Kosvian					346.7
																	Kizelian					350.7 *
																	Cherepetian					351.9 *
																	Karakubian					354.4 *
																	Upinian					356.3 *
																	Malevkian					357.6 *
																	Gumerovian					358 *
		Devonian	Late Devonian	Famennian															Wocklum/Dasberg/Hemberg/Nehden	Conewangan/Conneautan/Canadaway		358.9
			Late Devonian	Frasnian															Adorf	West Fallsian/Sonyean		372.2
			Middle Devonian	Givetian															Givetian	Geneseean/Taghanican/Tioughniogan	Cazenovian	382.7
			Middle Devonian	Eifelian															Eifelian	Southwoodian	Cazenovian	387.7
			Early Devonian	Emsian															Emsian	Sawkillian/Deer Parkian	Helderbergian	393.3
				Pragian															Siegen			407.6
				Lochkovian															Gedinnine			410.8
		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	Cincinnatian	Gamachian					Harju	Porkuni										443.8
				Katian		Gamachian						Pirgu										445.2
						Richmondian						Pirgu										446 *
						Richmondian						Vormsi										449.6 *
						Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					Vormsi										449.8 *
Nabala	Johvi †					Maysvillian		450 *
Nabala						Edenian		450.4 *
Viru						Edenian		Rakvere	450.6 *
					Mohawkian	Chatfieldian		Rakvere	451.1 *
								Oandu	452 *
	Sandbian			Keila				Idavere †	453
				Keila		Turinian			453.7 *
				Haljala					453.9
				Kukruse					456.4 *
				Kukruse	Whiterockian		Canadian †		Chazyan †/Marmor	457 *
				Uhaku				Aluoja †		457.5 *
	Middle Ordovician		Darriwilian	Uhaku						458.4
				Lasnamagi						458.9 *
				Aseri						460.4 *
Oeland				Kunda						462.9 *
				Kunda				Valaste †/Hunderum		464.3 *
				Volkhov						Langevoja †/Vaana/Saka	467.1 *
			Dapingian								467.3
						Rangerian					469.1 *
				Billingen		Rangerian					469.3 *
	Early Ordovician		Floian		Ibexian	Blackhillsian			Jeffersonian †		Cassinian †	470
								Latorp †				470.1 *
				Hunneberg								473.7 *
						Tulean						473.9 *
			Tremadocian			Tulean						477.7
						Stairsian						480.3 *
				Varangu		Stairsian						481.3 *
				Varangu		Skullrockian					Demingian †	482 *
				Pakerort							Demingian †	482.2 *
	Cambrian	Furongian	Stage 10	Pakerort								Franconian †/Dresbachian/Millardan	485.4
													486.3 *
													486.5
													Sunwaptan	487.5
			Jiangshanian										Sunwaptan	489.5
			Jiangshanian										Steptoean	493 *
			Paibian										Steptoean	494
		Miaolingian	Guzhangian									Marjumian	Albertian †	497
			Drumian									Marjumian		500.5
			Wuliuan									Topazan		504.5
			Wuliuan									Delamaran		506.5
		Series 2	Stage 4									Delamaran	Waucoban †	509
			Stage 4									Dyeran		511 *
			Stage 3									Dyeran		514
												Montezuman		514.8 *
												Begadean		519.9 *
		Terreneuvian	Stage 2											521
		Terreneuvian	Fortunian											529
	Proterozoic	Neoproterozoic	Ediacaran											Vendian †	Poundian †	538.8
	Proterozoic	Neoproterozoic	Ediacaran											Vendian †	Wonokan †	571.7 *
																						635