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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126778 collections

Show less time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ordovician of Australia	Carboniferous of North America	Ordovician of Britain				Cambrian of Britain		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	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
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		Longtanian †												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
Carboniferous	Pennsylvanian	Gzhelian					Virgilian									298.9
		Kasimovian			Missourian	303.7
		Kasimovian			Desmoinesian	305.9 *
		Moscovian			Desmoinesian	307
		Moscovian			Atokan	312.7 *
		Bashkirian			Atokan	315.2
		Bashkirian			Morrowan	318.4 *
	Mississippian	Serpukhovian			Chesterian	323.2
		Visean			Chesterian	330.9
					Meramecian	335.8 *
					Osagean	343.1 *
		Tournaisian			Osagean	346.7
		Tournaisian			Kinderhookian	351.9 *
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	Bolindian			Ashgill	Hirnantian	443.8
		Katian					Rawtheyan	445.2
							Cautleyan	448.9 *
			Eastonian				Cautleyan	449 *
							Pusgillian	449.3 *
						Caradoc	Streffordian	Onnian †	449.6 *
							Cheneyan		451.5 *
			Gisbornian				Cheneyan		452 *
							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	Darriwilian			Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian	Darriwilian				Abereiddian/Early Llanvirn			461.3 *
		Dapingian	Yapeenian				Abereiddian/Early Llanvirn			467.3
			Yapeenian			Arenig	Fennian			468.4 *
			Castlemainian							468.5 *
	Early Ordovician	Floian	Chewtonian							470
			Chewtonian				Whitlandian			471.1 *
			Bendigonian							471.8 *
			Lancefieldian							473.5 *
							Moridunian			474.3 *
		Tremadocian				Tremadoc	Migneintian			477.7
							Cressagian			480.8 *
			Warendian				Cressagian			482.8 *
			Warendian							485 *
Cambrian	Furongian	Stage 10		Merioneth						Dolgellian/Trempealeauan	Franconian †/Dresbachian/Millardan	485.4
										Dolgellian/Trempealeauan		Sunwaptan	487.5
										Festiniogian			489.2 *
		Jiangshanian											489.5
												Steptoean	493 *
										Maentwrogian			493.1 *
		Paibian								Maentwrogian			494
	Miaolingian	Guzhangian		Series 3 †						St Davids		Marjumian	Albertian †	497
		Drumian										Marjumian		500.5
		Wuliuan										Stage 5 †		Topazan	504.5
		Wuliuan										Stage 5 †		Delamaran	506.5
	Series 2	Stage 4										Caerfai	Waucoban †	Delamaran	509
		Stage 4												Dyeran	511 *
		Stage 3												Dyeran	514
														Montezuman	514.8 *
														Begadean	519.9 *
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
																538.8