PBDB Timescale

International Chronostratigraphic Timescale

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

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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

There are 59 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 127083 collections

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International Chronostratigraphic Timescale					Obsolete Names for ICS Units			Devonian Subages	Obsolete Precambrian Ages		Permian-Jurassic of New Zealand		Ordovician of the Baltic				Mesozoic Subages		Ten Million Year Bins	North American Land Mammal Ages
Phanerozoic	Cenozoic	Quaternary	Holocene	Meghalayan															Cenozoic 6	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															Cenozoic 5	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															Cenozoic 4		23.03
				Rupelian																	27.82
																				Whitneyan	29.5
																				Orellan	31.8
			Eocene	Priabonian															Cenozoic 3	Chadronian	33.9
				Priabonian																Duchesnean	37
				Bartonian																Duchesnean	37.71
				Bartonian																Uintan	39.7
				Lutetian															Cenozoic 2	Uintan	41.2
				Lutetian																Bridgerian	46.2
				Ypresian																Bridgerian	47.8
																				Wasatchian	50.5
																				Clarkforkian	54.9
			Paleocene	Thanetian															Cenozoic 1	Clarkforkian	56
				Thanetian																Tiffanian	56.2
				Selandian																Tiffanian	59.2
				Selandian																Torrejonian	60.9
				Danian																Torrejonian	61.6
				Danian																Puercan	63.8
	Mesozoic	Cretaceous	Late Cretaceous	Maastrichtian													Late Maastrichtian/Early Maastrichtian		Cretaceous 8		66
				Campanian													Late Campanian/Middle Campanian/Early Campanian		Cretaceous 7		72.1
				Santonian													Late Santonian/Middle Santonian/Early Santonian		Cretaceous 6		83.6
				Coniacian													Late Coniacian/Middle Coniacian/Early Coniacian				86.3
				Turonian													Late Turonian/Middle Turonian/Early Turonian				89.8
				Cenomanian													Late Cenomanian/Middle Cenomanian/Early Cenomanian		Cretaceous 5		93.9
			Early Cretaceous	Albian													Late Albian		Cretaceous 4		100.5
																	Middle Albian				106.2 *
																	Early Albian				109.9 *
				Aptian													Late Aptian		Cretaceous 3		113
				Aptian													Early Aptian		Cretaceous 3		119.5 *
				Barremian													Late Barremian/Early Barremian		Cretaceous 2		121.4
				Hauterivian													Late Hauterivian/Early Hauterivian		Cretaceous 2		125.77
				Valanginian													Late Valanginian/Early Valanginian		Cretaceous 1		132.6
				Berriasian													Late Berriasian				139.8
																	Middle Berriasian				140.6 *
																	Early Berriasian				142.7 *
		Jurassic	Late Jurassic	Tithonian							Oteke	Puaroan					Late Tithonian	Middle Tithonian	Jurassic 6		145
				Tithonian													Early Tithonian	Middle Tithonian	Jurassic 6		146.3 *
				Kimmeridgian													Late Kimmeridgian		Jurassic 5		149.2
											Kawhia	Ohauan					Late Kimmeridgian				150
Early Kimmeridgian						152.2 *						Ohauan
Early Kimmeridgian						Heterian	154.5
Oxfordian				Late Oxfordian			Middle Oxfordian/Early Oxfordian	154.8
Oxfordian							Middle Oxfordian/Early Oxfordian	157.9 *
Middle Jurassic			Callovian	Late Callovian/Middle Callovian/Early Callovian				161.5
			Callovian	Late Callovian/Middle Callovian/Early Callovian		Temaikan		164.3
			Bathonian	Late Bathonian/Middle Bathonian/Early Bathonian				Jurassic 4	165.3
			Bajocian	Late Bajocian					168.2
			Bajocian	Early Bajocian					168.6 *
			Aalenian	Late Aalenian/Middle Aalenian/Early Aalenian				Jurassic 3	170.9
Early Jurassic			Toarcian	Late Toarcian					174.7
				Late Toarcian		Herangi			Ururoan	176
				Middle Toarcian						180.4 *
				Early Toarcian						182.9 *
			Pliensbachian	Late Pliensbachian/Early Pliensbachian				Jurassic 2		184.2
			Pliensbachian	Late Pliensbachian/Early Pliensbachian				Jurassic 2	Aratauran	188.9
			Sinemurian	Late Sinemurian/Early Sinemurian				Jurassic 1		192.9
			Hettangian	Late Hettangian/Middle Hettangian/Early Hettangian				Jurassic 1		199.5
Triassic		Late Triassic	Rhaetian	Balfour		Otapirian			Triassic 4	201.4
			Norian			Warepan		Sevatian		208.5
								Alaunian		213.2 *
								Lacian		216.7 *
						Otamitan				217
						Oretian				221
			Carnian			Oretian		Tuvalian	Triassic 3	227
				Gore		Kaihikuan		Tuvalian		227.5
								Julian		233.4 *
		Middle Triassic	Ladinian					Longobardian	Triassic 2	237
						Etalian		Longobardian		238
								Fassanian		239.7 *
			Anisian					Illyrian		242
								Pelsonian		243.8 *
								Bithynian		244.7 *
								Aegean		245.5 *
						Malakovian		Aegean		246
		Early Triassic	Olenekian					Spathian	Triassic 1	247.2
								Smithian		248.9 *
						Nelsonian		Smithian		249
			Induan					Dienerian		251.2
								Griesbachian		251.4 *
				DUrville		Makarewan		Griesbachian		251.5
Paleozoic	Permian	Lopingian	Changhsingian			Makarewan			Permian 4	251.902
			Changhsingian			Waiitian				253.2
			Wuchiapingian		Longtanian †	Waiitian				254.14
			Wuchiapingian		Longtanian †	Puruhauan				254.2
		Guadalupian	Capitanian		Aparima	Flettian				259.51
			Wordian			Flettian				264.28
			Wordian			Barettian				266
			Roadian						Permian 3	266.9
		Cisuralian	Kungurian						Permian 2	273.01
			Kungurian			Mangapirian				276
			Artinskian			Mangapirian				283.5
						Telfordian				285
										288.5
			Sakmarian							290.1
			Asselian						Permian 1	293.52
	Carboniferous	Pennsylvanian	Gzhelian						Carboniferous 5	298.9
			Kasimovian						Carboniferous 5	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						Late Famennian	Wocklum/Dasberg/Hemberg/Nehden	Devonian 5	358.9
									Middle Famennian			365.3 *
									Early Famennian			368.5 *
			Frasnian						Late Frasnian	Adorf	Devonian 4	372.2
									Middle Frasnian			375.4 *
							Early Frasnian		379.3 *
		Middle Devonian	Givetian				Late Givetian		Givetian	Devonian 3	382.7
							Middle Givetian				383.7 *
							Early Givetian				385.9 *
			Eifelian				Late Eifelian		Eifelian		387.7
			Eifelian				Early Eifelian		Eifelian		390.3 *
		Early Devonian	Emsian				Late Emsian		Emsian	Devonian 2	393.3
			Emsian				Early Emsian		Emsian	Devonian 2	398.3 *
			Pragian				Pragian		Siegen	Devonian 1	407.6
			Lochkovian				Late Lochkovian		Gedinnine		410.8
							Middle Lochkovian				412.8 *
							Early Lochkovian				415.6 *
	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							Harju	Porkuni	Ordovician 5	443.8
			Katian								Pirgu		445.2
											Vormsi		449.6 *
											Nabala		Johvi †	450 *
										Viru	Rakvere			450.6 *
											Oandu			452 *
			Sandbian								Keila	Idavere †	Ordovician 4	453
											Haljala			453.9
											Kukruse			456.4 *
											Uhaku	Aluoja †		457.5 *
		Middle Ordovician	Darriwilian								Uhaku		Ordovician 3	458.4
											Lasnamagi			458.9 *
											Aseri			460.4 *
										Oeland	Kunda			462.9 *
											Kunda	Valaste †/Hunderum		464.3 *
											Volkhov			Langevoja †/Vaana/Saka	467.1 *
			Dapingian								Volkhov		Ordovician 2		467.3
Billingen			Dapingian					469.3 *
		Early Ordovician	Floian					470
								Latorp †				470.1 *
Hunneberg												473.7 *
Hunneberg			Tremadocian	Ordovician 1								477.7
Varangu												481.3 *
Pakerort												482.2 *
Pakerort	Cambrian	Furongian	Stage 10					Cambrian 5				485.4
												486.3 *
												486.5
			Jiangshanian									489.5
			Paibian									494
		Miaolingian	Guzhangian		Series 3 †	Cambrian 4		497
			Drumian			Cambrian 4		500.5
			Wuliuan			Stage 5 †		Cambrian 3				504.5
		Series 2	Stage 4					Cambrian 3				509
		Series 2	Stage 3					Cambrian 2				514
		Terreneuvian	Stage 2					Cambrian 2				521
		Terreneuvian	Fortunian					Cambrian 1				529
	Proterozoic	Neoproterozoic	Ediacaran										Vendian †	Poundian †		538.8
	Proterozoic	Neoproterozoic	Ediacaran										Vendian †	Wonokan †		571.7 *
																					635