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
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
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

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			Cretaceous North American Land-Mammal Ages	Cambrian of Kazakhstan	Ten Million Year Bins	Cenozoic Subepochs	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						Cenozoic 5	Middle Miocene		11.63
		Langhian							Middle Miocene		13.82
		Burdigalian							Early Miocene		15.98
		Aquitanian							Early Miocene		20.44
Paleogene	Oligocene	Chattian						Cenozoic 4	Late Oligocene		23.03
	Oligocene	Rupelian						Cenozoic 4	Early Oligocene		27.82
	Eocene	Priabonian						Cenozoic 3	Late Eocene		33.9
		Bartonian						Cenozoic 3	Middle Eocene		37.71
		Lutetian						Cenozoic 2	Middle Eocene		41.2
		Ypresian						Cenozoic 2	Early Eocene		47.8
	Paleocene	Thanetian						Cenozoic 1	Late Paleocene		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						Silurian 2	419.2
	Ludlow	Ludfordian						423
	Ludlow	Gorstian						425.6
	Wenlock	Homerian						427.4
	Wenlock	Sheinwoodian						430.5
	Llandovery	Telychian					Silurian 1	433.4
		Aeronian						438.5
		Rhuddanian						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	Batyrbaian			Cambrian 5	485.4
		Jiangshanian	Batyrbaian				489.5
			Aksaian				490.7 *
			Sakian				492.2 *
		Paibian	Sakian				494
	Miaolingian	Guzhangian	Series 3 †			Ayusokkanian	Cambrian 4	497
		Guzhangian						499.5
		Drumian				Zhanaarykian		500.5
		Drumian				Tuesaian		503
		Wuliuan		Stage 5 †		Tuesaian	Cambrian 3	504.5
		Wuliuan		Stage 5 †				505.3
	Series 2	Stage 4						509
						Toyonian		510 *
						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