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

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

Show more time

Show linear time

International Chronostratigraphic Timescale			North American Land Mammal Ages	Devonian Subages	Mesozoic Subages		Carboniferous Subepochs	Cambrian of North America
Quaternary	Holocene	Meghalayan	Saintaugustinean						0
		Meghalayan	Santarosean						0.0004
		Northgrippian							0.0042
		Greenlandian							0.0082
	Pleistocene	Late Pleistocene							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							2.58
		Zanclean							3.6
		Zanclean	Hemphillian						4.7
	Miocene	Messinian							5.333
		Tortonian							7.246
		Tortonian	Clarendonian						9.4
		Serravallian	Clarendonian						11.63
		Serravallian	Barstovian						12.5
		Langhian							13.82
		Burdigalian							15.98
			Hemingfordian						16.3
			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	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				293.52
Carboniferous	Pennsylvanian	Gzhelian				Late Pennsylvanian	298.9
		Kasimovian				Late Pennsylvanian	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	Late Famennian				358.9
			Middle Famennian				365.3 *
			Early Famennian				368.5 *
		Frasnian	Late Frasnian				372.2
			Middle Frasnian				375.4 *
			Early Frasnian				379.3 *
	Middle Devonian	Givetian	Late Givetian				382.7
			Middle Givetian				383.7 *
			Early Givetian				385.9 *
		Eifelian	Late Eifelian				387.7
		Eifelian	Early Eifelian				390.3 *
	Early Devonian	Emsian	Late Emsian				393.3
		Emsian	Early Emsian				398.3 *
		Pragian	Pragian				407.6
		Lochkovian	Late Lochkovian				410.8
			Middle Lochkovian				412.8 *
			Early Lochkovian				415.6 *
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			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