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
A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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			North American Land Mammal Ages	Cambrian of Australia	Ordovician of China			Mammal Paleogene Zones
Quaternary	Holocene	Meghalayan				Saintaugustinean							0
		Meghalayan				Santarosean							0.0004
		Northgrippian											0.0042
		Greenlandian											0.0082
	Pleistocene	Late Pleistocene											0.0117
		Late Pleistocene				Rancholabrean							0.014
		Chibanian				Rancholabrean							0.129
		Chibanian				Irvingtonian							0.21
		Calabrian				Irvingtonian							0.774
		Calabrian				Blancan							1.4
		Gelasian											1.8
Neogene	Pliocene	Piacenzian	Tertiary †										2.58
		Zanclean											3.6
		Zanclean				Hemphillian							4.7
	Miocene	Messinian											5.333
		Tortonian											7.246
		Tortonian				Clarendonian							9.4
		Serravallian				Clarendonian							11.63
		Serravallian				Barstovian							12.5
		Langhian											13.82
		Burdigalian											15.98
						Hemingfordian							16.3
						Arikareean							18.5
		Aquitanian											20.44
Paleogene	Oligocene	Chattian									MP 30/MP 29/MP 28/MP 27/MP 26	MP 25	23.03
		Rupelian									MP 24/MP 23/MP 22/MP 21		27.82
						Whitneyan							29.5
						Orellan							31.8
	Eocene	Priabonian				Chadronian					MP 20/MP 19/MP 18/MP 17B/MP 17A		33.9
		Priabonian				Duchesnean					MP 20/MP 19/MP 18/MP 17B/MP 17A		37
		Bartonian				Duchesnean					MP 16		37.71
		Bartonian				Uintan					MP 16		39.7
		Lutetian				Uintan					MP 15/MP 14/MP 13/MP 12/MP 11		41.2
		Lutetian				Bridgerian					MP 15/MP 14/MP 13/MP 12/MP 11		46.2
		Ypresian				Bridgerian					MP 10/MP 8 + 9/MP 7		47.8
						Wasatchian							50.5
						Clarkforkian							54.9
	Paleocene	Thanetian				Clarkforkian					MP 6	MP 1 - 5	56
		Thanetian				Tiffanian					MP 6		56.2
		Selandian				Tiffanian							59.2
		Selandian				Torrejonian							60.9
		Danian				Torrejonian							61.6
		Danian				Puercan							63.8
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			293.52
Carboniferous	Pennsylvanian	Gzhelian			298.9
		Kasimovian			303.7
		Moscovian			307
		Bashkirian			315.2
	Mississippian	Serpukhovian			323.2
		Visean			330.9
		Tournaisian			346.7
Devonian	Late Devonian	Famennian			358.9
	Late Devonian	Frasnian			372.2
	Middle Devonian	Givetian			Srbsko		382.7
	Middle Devonian	Eifelian			Chotec		387.7
	Early Devonian	Emsian			Daleje/Zlichovian		393.3
		Pragian			Pragian		407.6
		Lochkovian			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					Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian					Chientangkiangian		Wufeng †	445.2
		Katian					Neichianshanian/Hanjiang			449.5
		Sandbian	453				Neichianshanian/Hanjiang
	Middle Ordovician	Darriwilian	Darriwilian			Guniu †/Hulo	458.4
		Darriwilian	Darriwilian			Hunjiang †	Dawan †/Daobaowan/Ningkuo	466.3 *
		Dapingian	Dapingian					467.3
	Early Ordovician	Floian	Yiyangian					470
		Tremadocian	Xinchangian					477.7
		Tremadocian	Xinchangian				Lianghekou †	477.9 *
Cambrian	Furongian	Stage 10	Datsonian						485.4
		Stage 10	Payntonian						486.8 *
		Jiangshanian	Iverian						489.5
		Paibian	Idamean						494
	Miaolingian	Guzhangian	Series 3 †						Mindyallan	497
		Guzhangian							Boomerangian	499
		Drumian							Undillan	500.5
		Drumian							Floran	503
		Wuliuan		Stage 5 †					Templetonian	504.5
		Wuliuan		Stage 5 †					Ordian	507.8 *
	Series 2	Stage 4							Ordian	509
													510.8 *