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
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, 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			Permian of the Salt Range	Cretaceous North American Land-Mammal Ages	Cambrian of Kazakhstan	Ten Million Year Bins	Cenozoic Subepochs
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
		Induan									251.2
		Induan				Kathwai					251.5 *
Permian	Lopingian	Changhsingian				Kathwai			Permian 4		251.902
											252.4 *
						Chhidru					252.9 *
		Wuchiapingian		Longtanian †		Chhidru					254.14
						Kalabagh					255 *
						Wargal					256 *
	Guadalupian	Capitanian									259.51
		Wordian									264.28
											265.3 *
					Amb	266.1 *
		Roadian			Amb	Permian 3		266.9
		Roadian				Permian 3		270.7 *
	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						Mapingian †	303.7
		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