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
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

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 126691 collections

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International Chronostratigraphic Timescale					Obsolete Precambrian Ages		Cambrian Epochs	Ammonite Chrons of North America			Obsolete Names for ICS Units
Phanerozoic	Cenozoic	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
	Mesozoic	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				Epizigzagiceras						168.2
				Bajocian				Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense						168.4
				Aalenian				Howelli/Scissum/Westermanni						170.9
			Early Jurassic	Toarcian				Yakounensis/Hillebrandti/Crassicosta						174.7
								Planulata						179.3 *
								Planulata		Arnioceras arnouldi				179.8 *
								Kanense						181.3 *
								Carlottense						182.3 *
								Kunae						183.5 *
				Pliensbachian				Kunae						184.2
								Freboldi						185.1 *
								Whiteavesi/Imlayi	Tetraspidoceras					186.2 *
									Tetraspidoceras					189.2 *
								Plesechioceras harbledownense/Asteroceras varians/Coroniceras	Canadensis					190.3 *
				Sinemurian										192.9
								Pseudaetomoceras		Psiloceras				196.4 *
								Franziceras/Euphyllites						196.5 *
				Hettangian				Franziceras/Euphyllites						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
	Paleozoic	Permian	Lopingian	Changhsingian										251.902
			Lopingian	Wuchiapingian								Longtanian †		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	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	Late Cambrian	485.4
			Jiangshanian		489.5
			Paibian		494
		Miaolingian	Guzhangian	Middle Cambrian	Series 3 †	497
			Drumian			500.5
			Wuliuan			Stage 5 †	504.5
		Series 2	Stage 4	Early Cambrian			509
		Series 2	Stage 3				514
		Terreneuvian	Stage 2				521
		Terreneuvian	Fortunian				529
Proterozoic	Neoproterozoic	Ediacaran					Vendian †				Poundian †		538.8
Proterozoic	Neoproterozoic	Ediacaran					Vendian †				Wonokan †		571.7 *
														635