PBDB Interval

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

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 126701 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Ordovician of Ibero-Bohemia				Permian of North America		Ordovician of the Baltic				Obsolete Names for ICS Units
Neogene	Pliocene	Piacenzian																		Tertiary †		2.58
	Pliocene	Zanclean																				3.6
	Miocene	Messinian																				5.333
		Tortonian																				7.246
		Serravallian																				11.63
		Langhian																				13.82
		Burdigalian																				15.98
		Aquitanian																				20.44
Paleogene	Oligocene	Chattian																				23.03
	Oligocene	Rupelian																				27.82
	Eocene	Priabonian																				33.9
		Bartonian																				37.71
		Lutetian																				41.2
		Ypresian																				47.8
	Paleocene	Thanetian																				56
		Selandian																				59.2
		Danian																				61.6
Cretaceous	Late Cretaceous	Maastrichtian																				66
		Campanian																				72.1
		Santonian																				83.6
		Coniacian																				86.3
		Turonian																				89.8
		Cenomanian																				93.9
	Early Cretaceous	Albian																				100.5
		Aptian																				113
		Barremian																				121.4
		Hauterivian																				125.77
		Valanginian																				132.6
		Berriasian																				139.8
Jurassic	Late Jurassic	Tithonian																				145
		Kimmeridgian																				149.2
		Oxfordian																				154.8
	Middle Jurassic	Callovian																				161.5
		Bathonian																				165.3
		Bajocian																				168.2
		Aalenian																				170.9
	Early Jurassic	Toarcian																				174.7
		Pliensbachian																				184.2
		Sinemurian																				192.9
		Hettangian																				199.5
Triassic	Late Triassic	Rhaetian																				201.4
		Norian																				208.5
		Carnian																				227
	Middle Triassic	Ladinian																				237
	Middle Triassic	Anisian																				242
	Early Triassic	Olenekian																				247.2
	Early Triassic	Induan																				251.2
Permian	Lopingian	Changhsingian																				251.902
	Lopingian	Wuchiapingian																			Longtanian †	254.14
	Guadalupian	Capitanian												Capitanian								259.51
		Wordian												Wordian								264.28
		Roadian												Roadian								266.9
	Cisuralian	Kungurian												Leonardian	Cathedralian							273.01
		Kungurian													Hessian							281.9 *
		Artinskian													Hessian							283.5
		Artinskian												Wolfcampian	Lenoxian							286.1 *
		Sakmarian													Lenoxian							290.1
		Asselian													Nealian							293.52
Carboniferous	Pennsylvanian	Gzhelian																				298.9
		Kasimovian																				303.7
		Moscovian																				307
		Bashkirian																				315.2
	Mississippian	Serpukhovian																				323.2
		Visean																				330.9
		Tournaisian	346.7
Devonian	Late Devonian	Famennian	358.9
	Late Devonian	Frasnian	372.2
	Middle Devonian	Givetian	382.7
	Middle Devonian	Eifelian	387.7
	Early Devonian	Emsian	393.3
		Pragian	407.6
		Lochkovian	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	Ashgill	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian	Harju	Porkuni	443.8
		Katian		Rawtheyan	Chientangkiangian			Kralodvorian		Bohdalec †	Pirgu	445.2
				Cautleyan								448.9 *
				Pusgillian								449.3 *
				Pusgillian	Neichianshanian/Hanjiang							449.5
			Caradoc	Streffordian							Onnian †	Vormsi	449.6 *
								Berounian				Vormsi	449.7 *
												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 *
																	Zahorany †/Vinice	Letna †	456.2 *
												Kukruse							456.4 *
				Aurelucian															456.8 *
											Soudleyan †/Harnagian/Costonian								457.4 *
												Uhaku	Aluoja †						457.5 *
										Liben †									458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn		Darriwilian					Guniu †/Hulo								458.4
								Dobrotivian											458.5 *
								Dobrotivian				Lasnamagi							458.9 *
								Oretanian				Lasnamagi							459.7 *
												Aseri							460.4 *
				Abereiddian/Early Llanvirn															461.3 *
										Sarka †									461.7 *
									Oeland			Kunda							462.9 *
													Valaste †/Hunderum						464.3 *
							Hunjiang †				Dawan †/Daobaowan/Ningkuo								466.3 *
												Volkhov							Langevoja †/Vaana/Saka	467.1 *
		Dapingian				Dapingian				Klabava †										467.3
								Arenigian												468
			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		Xinchangian		Tremadocian						477.7
				Migneintian							Lianghekou †			477.9 *
				Cressagian										480.8 *
												Varangu		481.3 *
												Pakerort		482.2 *
														485 *
Cambrian	Furongian	Stage 10												485.4
														486.3 *
														486.5
		Jiangshanian												489.5
		Paibian												494
	Miaolingian	Guzhangian												Series 3 †	497
		Drumian													500.5
		Wuliuan													Stage 5 †					504.5
																						509