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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 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 125929 collections

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International Chronostratigraphic Timescale			Cenozoic Subepochs	Ordovician of Britain				North American Land Mammal Ages
Quaternary	Holocene	Meghalayan						Saintaugustinean	0
		Meghalayan						Santarosean	0.0004
		Northgrippian							0.0042
		Greenlandian							0.0082
	Pleistocene	Late Pleistocene	Late Pleistocene						0.0117
		Late Pleistocene	Late Pleistocene					Rancholabrean	0.014
		Chibanian	Middle Pleistocene					Rancholabrean	0.129
		Chibanian	Middle Pleistocene					Irvingtonian	0.21
		Calabrian	Early Pleistocene					Irvingtonian	0.774
		Calabrian						Blancan	1.4
		Gelasian							1.8
Neogene	Pliocene	Piacenzian	Late Pliocene						2.58
		Zanclean	Early Pliocene						3.6
		Zanclean	Early Pliocene					Hemphillian	4.7
	Miocene	Messinian	Late Miocene						5.333
		Tortonian							7.246
		Tortonian						Clarendonian	9.4
		Serravallian	Middle Miocene					Clarendonian	11.63
		Serravallian						Barstovian	12.5
		Langhian							13.82
		Burdigalian	Early Miocene						15.98
								Hemingfordian	16.3
								Arikareean	18.5
		Aquitanian							20.44
Paleogene	Oligocene	Chattian	Late Oligocene						23.03
		Rupelian	Early Oligocene						27.82
								Whitneyan	29.5
								Orellan	31.8
	Eocene	Priabonian	Late Eocene					Chadronian	33.9
		Priabonian	Late Eocene					Duchesnean	37
		Bartonian	Middle Eocene					Duchesnean	37.71
		Bartonian						Uintan	39.7
		Lutetian						Uintan	41.2
		Lutetian						Bridgerian	46.2
		Ypresian	Early Eocene					Bridgerian	47.8
								Wasatchian	50.5
								Clarkforkian	54.9
	Paleocene	Thanetian	Late Paleocene					Clarkforkian	56
		Thanetian	Late Paleocene					Tiffanian	56.2
		Selandian	Middle Paleocene					Tiffanian	59.2
		Selandian	Middle Paleocene					Torrejonian	60.9
		Danian	Early Paleocene					Torrejonian	61.6
		Danian	Early Paleocene					Puercan	63.8
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		Ashgill	Hirnantian	443.8
		Katian			Rawtheyan	445.2
					Cautleyan	448.9 *
			Pusgillian		449.3 *
			Caradoc	Streffordian	Onnian †	449.6 *
				Cheneyan		451.5 *
				Burrellian		452.7 *
		Sandbian				453
					Actonian †	453.2 *
					Marshbrookian †	Woolstonian †	454.2 *
					Longvillian †		455.2 *
				Aurelucian	Longvillian †		456.8 *
				Aurelucian	Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian		Abereiddian/Early Llanvirn			461.3 *
		Dapingian		Abereiddian/Early Llanvirn			467.3
		Dapingian	Arenig	Fennian			468.4 *
	Early Ordovician	Floian		Fennian			470
				Whitlandian			471.1 *
				Moridunian			474.3 *
		Tremadocian	Tremadoc	Migneintian			477.7
		Tremadocian	Tremadoc	Cressagian			480.8 *
									485 *