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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ten Million Year Bins	Permian of China	Cambrian of Siberia			Devonian of Czechoslovakia	Cenozoic Subepochs	Silurian of North America
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				Cretaceous 8												66
		Campanian				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	Meishanian											251.902
		Changhsingian					Baoqingian											253.4 *
		Wuchiapingian		Longtanian †			Laoshanian											254.14
		Wuchiapingian		Longtanian †			Laibinian											257.7 *
	Guadalupian	Capitanian					Lengwuan											259.51
		Wordian					Kuhfengian											264.28
		Roadian				Permian 3	Kuhfengian											266.9
	Cisuralian	Kungurian				Permian 2	Luodianian											273.01
		Artinskian					Luodianian											283.5
		Artinskian					Longlinian											285.4 *
		Sakmarian			290.1		Longlinian
		Asselian			Permian 1	Zisongian	293.52
Carboniferous	Pennsylvanian	Gzhelian			Carboniferous 5	Zisongian	298.9
		Gzhelian					300.1
		Kasimovian					303.7
		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		Srbsko	382.7
	Middle Devonian	Eifelian			Devonian 3		Chotec	387.7
	Early Devonian	Emsian			Devonian 2		Daleje/Zlichovian	393.3
		Pragian			Devonian 1		Pragian	407.6
		Lochkovian			Devonian 1		Lochkovian	410.8
Silurian	Pridoli				Silurian 2			Cayugan	419.2
	Pridoli							Niagaran	422.5 *
	Ludlow	Ludfordian							423
	Ludlow	Gorstian							425.6
	Wenlock	Homerian							Lockportian	427.4
	Wenlock	Sheinwoodian								430.5
	Llandovery	Telychian			Silurian 1				Ontarian	433.4
		Aeronian	438.5
			Alexandrian							438.7 *
								Medinan	Clinton	440.1 *
										440.7 *
		Rhuddanian								440.8
Ordovician	Late Ordovician	Hirnantian	Ordovician 5							Harju	Porkuni	443.8
		Katian									Pirgu	445.2
											Vormsi	449.6 *
											Nabala	Johvi †	450 *
										Viru	Rakvere		450.6 *
											Oandu		452 *
		Sandbian	Ordovician 4								Keila	Idavere †	453
											Haljala		453.9
											Kukruse		456.4 *
											Uhaku	Aluoja †	457.5 *
	Middle Ordovician	Darriwilian	Ordovician 3								Uhaku		458.4
											Lasnamagi		458.9 *
											Aseri		460.4 *
										Oeland	Kunda		462.9 *
											Kunda	Valaste †/Hunderum	464.3 *
											Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian	Ordovician 2								Volkhov			467.3
		Dapingian									Billingen			469.3 *
	Early Ordovician	Floian												470
												Latorp †		470.1 *
											Hunneberg			473.7 *
		Tremadocian	Ordovician 1								Hunneberg			477.7
											Varangu			481.3 *
											Pakerort			482.2 *
														Mansian †	483.55 *
Cambrian	Furongian	Stage 10	Cambrian 5									Batyrbaian		Tavgian †	Ketyan †/Yurakian	485.4
																486.3 *
																486.5
		Jiangshanian														489.5
				Aksaian								490.7 *
				Sakian								492.2 *
		Paibian										494
		Paibian										Ensyan †/Maduan/Nganasanian			494.7 *
	Miaolingian	Guzhangian	Series 3 †	Cambrian 4								Ayusokkanian				497
		Guzhangian										Mayan/Menevian				499.5
		Drumian										Mayan/Menevian				500.5
		Wuliuan		Stage 5 †								Cambrian 3				Amgan/Solvan	504.5
	Series 2	Stage 4														Amgan/Solvan	509
						Toyonian								Lenian †		510 *
						Botomian										512.5 *
		Stage 3				Botomian						Cambrian 2				514
		Stage 3				Atdabanian										515.6 *
	Terreneuvian	Stage 2				Tommotian										521
		Stage 2				Nemakit-Daldynian										525.5
		Fortunian				Nemakit-Daldynian						Cambrian 1		Manykaian †		529
																		538.8