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
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

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 127243 collections

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International Chronostratigraphic Timescale			Ordovician of North America						Ordovician of China			Ordovician of Britain
Quaternary	Holocene	Meghalayan														0
		Northgrippian														0.0042
		Greenlandian														0.0082
	Pleistocene	Late Pleistocene														0.0117
		Chibanian														0.129
		Calabrian														0.774
		Gelasian														1.8
Neogene	Pliocene	Piacenzian														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														254.14
	Guadalupian	Capitanian														259.51
		Wordian														264.28
		Roadian														266.9
	Cisuralian	Kungurian														273.01
		Artinskian														283.5
		Sakmarian														290.1
		Asselian														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	Cincinnatian	Gamachian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Ashgill	Hirnantian	443.8
		Katian		Gamachian	Chientangkiangian				Rawtheyan	445.2
				Richmondian					Rawtheyan	446 *
									Cautleyan	448.9 *
									Pusgillian	449.3 *
					Neichianshanian/Hanjiang				Pusgillian	449.5
								Caradoc	Streffordian	Onnian †	449.6 *
				Maysvillian							Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.8 *
				Edenian								450.4 *
			Mohawkian	Chatfieldian								451.1 *
									Cheneyan			451.5 *
									Burrellian			452.7 *
		Sandbian										453
										Actonian †		453.2 *
				Turinian						Actonian †		453.7 *
										Marshbrookian †		Woolstonian †	454.2 *
										Longvillian †			455.2 *
									Aurelucian				456.8 *
			Whiterockian								Canadian †		Chazyan †/Marmor	457 *
										Soudleyan †/Harnagian/Costonian				457.4 *
	Middle Ordovician	Darriwilian			Darriwilian	Guniu †/Hulo		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn					458.4
						Guniu †/Hulo			Abereiddian/Early Llanvirn					461.3 *
						Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
		Dapingian			Dapingian									467.3
								Arenig	Fennian					468.4 *
				Rangerian										469.1 *
	Early Ordovician	Floian	Ibexian	Blackhillsian	Jeffersonian †								Cassinian †	Yiyangian	470
				Blackhillsian					Whitlandian						471.1 *
				Tulean					Whitlandian						473.9 *
									Moridunian						474.3 *
		Tremadocian						Xinchangian	Tremadoc					Migneintian	477.7
							Lianghekou †								477.9 *
				Stairsian											480.3 *
				Stairsian										Cressagian	480.8 *
				Skullrockian									Demingian †	Cressagian	482 *
													Demingian †		485 *
Cambrian	Furongian	Stage 10													485.4
		Stage 10													487.5
		Jiangshanian													489.5
		Paibian													494
	Miaolingian	Guzhangian													497
		Drumian													500.5
		Wuliuan													504.5
	Series 2	Stage 4													509
	Series 2	Stage 3													514
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
																538.8