PBDB Timescale

Obsolete Names for ICS Units

The interval definitions in this timescale are derived from the following sources:

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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 view

There are 55 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 92 collections

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Cambrian of Australia	Cenozoic Subepochs	Silurian of England		Cretaceous North American Land-Mammal Ages	Cambrian of Kazakhstan	Ten Million Year Bins	Obsolete Carboniferous Ages of China
Quaternary	Holocene	Meghalayan										Cenozoic 6		0
		Northgrippian												0.0042
		Greenlandian												0.0082
	Pleistocene	Late Pleistocene					Late Pleistocene							0.0117
		Chibanian					Middle Pleistocene							0.129
		Calabrian					Early Pleistocene							0.774
		Gelasian					Early Pleistocene							1.8
Neogene	Pliocene	Piacenzian	Tertiary †				Late Pliocene							2.58
	Pliocene	Zanclean					Early Pliocene							3.6
	Miocene	Messinian					Late Miocene							5.333
		Tortonian					Late Miocene							7.246
		Serravallian					Middle Miocene					Cenozoic 5		11.63
		Langhian					Middle Miocene							13.82
		Burdigalian					Early Miocene							15.98
		Aquitanian					Early Miocene							20.44
Paleogene	Oligocene	Chattian					Late Oligocene					Cenozoic 4		23.03
	Oligocene	Rupelian					Early Oligocene					Cenozoic 4		27.82
	Eocene	Priabonian					Late Eocene					Cenozoic 3		33.9
		Bartonian					Middle Eocene					Cenozoic 3		37.71
		Lutetian					Middle Eocene					Cenozoic 2		41.2
		Ypresian					Early Eocene					Cenozoic 2		47.8
	Paleocene	Thanetian					Late Paleocene					Cenozoic 1		56
		Selandian					Middle Paleocene							59.2
		Danian					Early Paleocene							61.6
Cretaceous	Late Cretaceous	Maastrichtian								Lancian/Edmontonian		Cretaceous 8		66
		Campanian								Judithian/Aquilan		Cretaceous 7		72.1
		Santonian										Cretaceous 6		83.6
		Coniacian												86.3
		Turonian												89.8
		Cenomanian										Cretaceous 5		93.9
	Early Cretaceous	Albian										Cretaceous 4		100.5
		Aptian										Cretaceous 3		113
		Barremian										Cretaceous 2		121.4
		Hauterivian										Cretaceous 2		125.77
		Valanginian										Cretaceous 1		132.6
		Berriasian										Cretaceous 1		139.8
Jurassic	Late Jurassic	Tithonian										Jurassic 6		145
		Kimmeridgian										Jurassic 5		149.2
		Oxfordian												154.8
	Middle Jurassic	Callovian												161.5
		Bathonian										Jurassic 4		165.3
		Bajocian										Jurassic 4		168.2
		Aalenian										Jurassic 3		170.9
	Early Jurassic	Toarcian										Jurassic 3		174.7
		Pliensbachian										Jurassic 2		184.2
		Sinemurian										Jurassic 1		192.9
		Hettangian										Jurassic 1		199.5
Triassic	Late Triassic	Rhaetian										Triassic 4		201.4
		Norian										Triassic 4		208.5
		Carnian										Triassic 3		227
	Middle Triassic	Ladinian										Triassic 2		237
	Middle Triassic	Anisian										Triassic 2		242
	Early Triassic	Olenekian										Triassic 1		247.2
	Early Triassic	Induan										Triassic 1		251.2
Permian	Lopingian	Changhsingian										Permian 4		251.902
	Lopingian	Wuchiapingian		Longtanian †										254.14
	Guadalupian	Capitanian												259.51
		Wordian												264.28
		Roadian										Permian 3		266.9
	Cisuralian	Kungurian										Permian 2		273.01
		Artinskian												283.5
		Sakmarian												290.1
		Asselian										Permian 1		293.52
Carboniferous	Pennsylvanian	Gzhelian										Carboniferous 5	Mapingian †	298.9
		Kasimovian			303.7								Mapingian †
		Kasimovian				305.9
		Moscovian				Carboniferous 4		307
		Bashkirian				Carboniferous 4		315.2
	Mississippian	Serpukhovian				Carboniferous 3		323.2
		Visean				Carboniferous 2		330.9
		Tournaisian				Carboniferous 1		346.7
Devonian	Late Devonian	Famennian				Devonian 5		358.9
	Late Devonian	Frasnian				Devonian 4		372.2
	Middle Devonian	Givetian				Devonian 3		382.7
	Middle Devonian	Eifelian				Devonian 3		387.7
	Early Devonian	Emsian				Devonian 2		393.3
		Pragian				Devonian 1		407.6
		Lochkovian				Devonian 1		410.8
Silurian	Pridoli					Red Downtonian/Temeside Shales/Downton Castle		Whitcliffe/Leintwardine	Silurian 2		419.2
	Pridoli					Red Downtonian/Temeside Shales/Downton Castle		Bringewood/Elton			421.3
	Ludlow	Ludfordian				Coalbrookdale		Wenlock (England)/Tickwood			423
		Gorstian									425.6
		Gorstian						Buildwas			426.4 *
	Wenlock	Homerian						Buildwas			427.4
		Homerian				Wych		Woolhope			428.4 *
		Sheinwoodian									430.5
	Llandovery	Telychian							Silurian 1		433.4
		Telychian									436.3 *
		Aeronian	438.5
		Aeronian	Cowleigh Park			439.3 *
		Rhuddanian	Cowleigh Park			440.8
Ordovician	Late Ordovician	Hirnantian				Ordovician 5	443.8
		Katian				Ordovician 5	445.2
		Sandbian				Ordovician 4	453
	Middle Ordovician	Darriwilian				Ordovician 3	458.4
	Middle Ordovician	Dapingian				Ordovician 2	467.3
	Early Ordovician	Floian				Ordovician 2	470
	Early Ordovician	Tremadocian				Ungurian	Ordovician 1		477.7
Cambrian	Furongian	Stage 10				Datsonian	Batyrbaian		Cambrian 5	485.4
		Stage 10				Payntonian				486.8 *
		Jiangshanian				Iverian				489.5
							Aksaian			490.7 *
							Sakian			492.2 *
		Paibian				Idamean	Sakian			494
	Miaolingian	Guzhangian				Series 3 †	Mindyallan		Ayusokkanian	Cambrian 4	497
							Boomerangian		Ayusokkanian		499
							Boomerangian				499.5
		Drumian					Undillan		Zhanaarykian		500.5
		Drumian					Floran		Tuesaian		503
		Wuliuan		Stage 5 †			Templetonian		Tuesaian	Cambrian 3	504.5
							Templetonian				505.3
							Ordian				507.8 *
	Series 2	Stage 4									509
									Toyonian		510 *
									Toyonian		510.8 *
									Botomian		512.5 *
		Stage 3							Botomian	Cambrian 2	514
		Stage 3							Atdabanian		515.6 *
	Terreneuvian	Stage 2							Tommotian		521
		Stage 2									525.5
		Fortunian								Cambrian 1	529
														538.8