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
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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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
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 126849 collections

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International Chronostratigraphic Timescale			Devonian of France	Permian of China	Mesozoic Subages		Neogene Mammal Ages of China	North American Land Mammal Ages	Silurian Ages of Europe	Carboniferous Subepochs
Quaternary	Holocene	Meghalayan						Saintaugustinean			0
		Meghalayan						Santarosean			0.0004
		Northgrippian									0.0042
		Greenlandian									0.0082
	Pleistocene	Late Pleistocene					Nihewanian				0.0117
		Late Pleistocene						Rancholabrean			0.014
		Chibanian						Rancholabrean			0.129
		Chibanian						Irvingtonian			0.21
		Calabrian						Irvingtonian			0.774
		Calabrian						Blancan			1.4
		Gelasian									1.8
Neogene	Pliocene	Piacenzian					Yushean				2.58
		Zanclean									3.6
								Hemphillian			4.7
							Baodean				4.9
	Miocene	Messinian									5.333
		Tortonian									7.246
								Clarendonian			9.4
							Tunggurian				11.1
		Serravallian									11.63
		Serravallian						Barstovian			12.5
		Langhian					Shanwangian				13.82
		Burdigalian									15.98
								Hemingfordian			16.3
							Xiejiaan	Hemingfordian			16.9
								Arikareean			18.5
		Aquitanian									20.44
Paleogene	Oligocene	Chattian									23.03
		Rupelian									27.82
								Whitneyan			29.5
								Orellan			31.8
	Eocene	Priabonian						Chadronian			33.9
		Priabonian						Duchesnean			37
		Bartonian						Duchesnean			37.71
		Bartonian						Uintan			39.7
		Lutetian						Uintan			41.2
		Lutetian						Bridgerian			46.2
		Ypresian						Bridgerian			47.8
								Wasatchian			50.5
								Clarkforkian			54.9
	Paleocene	Thanetian						Clarkforkian			56
		Thanetian						Tiffanian			56.2
		Selandian						Tiffanian			59.2
		Selandian						Torrejonian			60.9
		Danian						Torrejonian			61.6
		Danian						Puercan			63.8
Cretaceous	Late Cretaceous	Maastrichtian			Late Maastrichtian/Early Maastrichtian						66
		Campanian			Late Campanian/Middle Campanian/Early Campanian						72.1
		Santonian			Late Santonian/Middle Santonian/Early Santonian						83.6
		Coniacian			Late Coniacian/Middle Coniacian/Early Coniacian						86.3
		Turonian			Late Turonian/Middle Turonian/Early Turonian						89.8
		Cenomanian			Late Cenomanian/Middle Cenomanian/Early Cenomanian						93.9
	Early Cretaceous	Albian			Late Albian						100.5
					Middle Albian						106.2 *
					Early Albian						109.9 *
		Aptian			Late Aptian						113
		Aptian			Early Aptian						119.5 *
		Barremian			Late Barremian/Early Barremian						121.4
		Hauterivian			Late Hauterivian/Early Hauterivian						125.77
		Valanginian			Late Valanginian/Early Valanginian						132.6
		Berriasian			Late Berriasian						139.8
					Middle Berriasian						140.6 *
					Early Berriasian						142.7 *
Jurassic	Late Jurassic	Tithonian			Late Tithonian	Middle Tithonian					145
		Tithonian	Early Tithonian	146.3 *		Middle Tithonian
		Kimmeridgian	Late Kimmeridgian		149.2
		Kimmeridgian	Early Kimmeridgian		152.2 *
		Oxfordian	Late Oxfordian	Middle Oxfordian/Early Oxfordian	154.8
		Oxfordian		Middle Oxfordian/Early Oxfordian	157.9 *
	Middle Jurassic	Callovian	Late Callovian/Middle Callovian/Early Callovian		161.5
		Bathonian	Late Bathonian/Middle Bathonian/Early Bathonian		165.3
		Bajocian	Late Bajocian		168.2
		Bajocian	Early Bajocian		168.6 *
		Aalenian	Late Aalenian/Middle Aalenian/Early Aalenian		170.9
	Early Jurassic	Toarcian	Late Toarcian		174.7
			Middle Toarcian		180.4 *
			Early Toarcian		182.9 *
		Pliensbachian	Late Pliensbachian/Early Pliensbachian		184.2
		Sinemurian	Late Sinemurian/Early Sinemurian		192.9
		Hettangian	Late Hettangian/Middle Hettangian/Early Hettangian		199.5
Triassic	Late Triassic	Rhaetian			201.4
		Norian	Sevatian		208.5
			Alaunian		213.2 *
			Lacian		216.7 *
		Carnian	Tuvalian		227
		Carnian	Julian		233.4 *
	Middle Triassic	Ladinian	Longobardian		237
		Ladinian	Fassanian		239.7 *
		Anisian	Illyrian		242
			Pelsonian		243.8 *
			Bithynian		244.7 *
			Aegean		245.5 *
	Early Triassic	Olenekian	Spathian		247.2
		Olenekian	Smithian		248.9 *
		Induan	Dienerian		251.2
		Induan	Griesbachian		251.4 *
Permian	Lopingian	Changhsingian	Meishanian			251.902
		Changhsingian	Baoqingian			253.4 *
		Wuchiapingian	Laoshanian			254.14
		Wuchiapingian	Laibinian			257.7 *
	Guadalupian	Capitanian	Lengwuan			259.51
		Wordian	Kuhfengian			264.28
		Roadian	Kuhfengian			266.9
	Cisuralian	Kungurian	Luodianian			273.01
		Artinskian	Luodianian			283.5
		Artinskian	Longlinian			285.4 *
		Sakmarian	Longlinian			290.1
		Asselian	Zisongian			293.52
Carboniferous	Pennsylvanian	Gzhelian	Zisongian			Late Pennsylvanian	298.9
		Gzhelian					300.1
		Kasimovian					303.7
		Moscovian				Middle Pennsylvanian	307
		Bashkirian				Early Pennsylvanian	315.2
	Mississippian	Serpukhovian				Late Mississippian	323.2
		Visean				Middle Mississippian	330.9
		Tournaisian				Early Mississippian	346.7
Devonian	Late Devonian	Famennian				Famennian	Wocklum/Dasberg/Hemberg/Nehden	358.9
	Late Devonian	Frasnian				Frasnian	Adorf	372.2
	Middle Devonian	Givetian				Givetian	Givetian	382.7
	Middle Devonian	Eifelian				Couvinien	Eifelian	387.7
	Early Devonian	Emsian					Emsian	393.3
		Pragian					Siegen	407.6
		Pragian				Coblencien	Siegen	408.2 *
		Lochkovian				Gedinnine	Gedinnine	410.8
Silurian	Pridoli							419.2
	Ludlow	Ludfordian						423
	Ludlow	Gorstian						425.6
	Wenlock	Homerian						Gleedonian	427.4
		Homerian						Whitwellian	429.7 *
		Sheinwoodian							430.5
	Llandovery	Telychian							433.4
		Aeronian							438.5
		Rhuddanian							440.8
Ordovician	Late Ordovician	Hirnantian		443.8
		Katian		445.2
		Sandbian		453
	Middle Ordovician	Darriwilian		458.4
	Middle Ordovician	Dapingian		467.3
	Early Ordovician	Floian		470
	Early Ordovician	Tremadocian		477.7
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan					485.4
		Stage 10							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
											538.8