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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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 126762 collections

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International Chronostratigraphic Timescale			Carboniferous of Western Europe		Cambrian Epochs	Mesozoic Subages		Carboniferous of North America	Cambrian of North America
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				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	Middle Tithonian			146.3 *
		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		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		Bursumian †	293.52
		Asselian		Bursumian †	Kuzel	297.7
Carboniferous	Pennsylvanian	Gzhelian		Virgilian	Kuzel	298.9
					Stephanian	Stephanian C		300.3 *
						Stephanian B		300.9 *
						Stephanian A		301.4 *
		Kasimovian		Missourian		Stephanian A		303.7
				Missourian		Cantabrian		305 *
				Desmoinesian				305.9 *
		Moscovian						307
					Westphalian	Westphalian D		307.4 *
						Westphalian C		309.8
				Atokan		Westphalian C		312.7 *
						Westphalian B		314.6
		Bashkirian				Westphalian B		315.2
						Westphalian A		317 *
				Morrowan		Westphalian A		318.4 *
					Namurian	Yeadonian		318.8 *
						Marsdenian		320.2 *
						Kinderscoutian		321.5 *
						Alportian		322 *
						Chokierian		323.1 *
	Mississippian	Serpukhovian		Chesterian		Chokierian		323.2
						Arnsbergian		324 *
						Pendleian		327.4 *
		Visean			Warnantian	Brigantian †		330.9
				Meramecian	Warnantian	Brigantian †		335.8 *
					Livian	Asbian †		336.3 *
					Moliniacian	Holkerian †/Arundian/Chadian		340.2 *
				Osagean	Moliniacian	Holkerian †/Arundian/Chadian	343.1 *
		Tournaisian		Osagean	Ivorian		346.7
				Kinderhookian	Ivorian		351.9 *
				Kinderhookian	Hastarian		353.7 *
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	Franconian †/Dresbachian/Millardan	485.4
		Stage 10	Sunwaptan						487.5
		Jiangshanian	Sunwaptan						489.5
		Jiangshanian	Steptoean						493 *
		Paibian	Steptoean						494
	Miaolingian	Guzhangian	Middle Cambrian				Marjumian	Albertian †	497
		Drumian					Marjumian		500.5
		Wuliuan					Topazan		504.5
		Wuliuan					Delamaran		506.5
	Series 2	Stage 4	Early Cambrian				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