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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 127967 collections

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International Chronostratigraphic Timescale					Ordovician of Ibero-Bohemia				Ordovician of the Baltic				Ordovician of China			Carboniferous of North America	Devonian of France	Precambrian of Russia	Silurian Ages of Europe	Devonian of Germany
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian												Bursumian †					293.52
		Carboniferous	Pennsylvanian	Gzhelian												Virgilian					298.9
				Kasimovian												Missourian					303.7
				Kasimovian												Desmoinesian					305.9 *
				Moscovian												Desmoinesian					307
				Moscovian												Atokan					312.7 *
				Bashkirian												Atokan					315.2
				Bashkirian												Morrowan					318.4 *
			Mississippian	Serpukhovian												Chesterian					323.2
				Visean												Chesterian					330.9
																Meramecian					335.8 *
																Osagean					343.1 *
				Tournaisian												Osagean					346.7
				Tournaisian												Kinderhookian					351.9 *
		Devonian	Late Devonian	Famennian													Famennian			Wocklum/Dasberg/Hemberg/Nehden	358.9
			Late Devonian	Frasnian													Frasnian			Adorf	372.2
			Middle Devonian	Givetian													Givetian			Givetian	382.7
			Middle Devonian	Eifelian													Couvinien			Eifelian	387.7
			Early Devonian	Emsian																Emsian	393.3
				Pragian																Siegen	407.6
				Pragian													Coblencien			Siegen	408.2 *
				Lochkovian													Gedinnine			Gedinnine	410.8
		Silurian	Pridoli																		419.2
			Ludlow	Ludfordian																	423
			Ludlow	Gorstian																	425.6
			Wenlock	Homerian															Gleedonian		427.4
				Homerian															Whitwellian		429.7 *
				Sheinwoodian																	430.5
			Llandovery	Telychian																	433.4
				Aeronian																	438.5
				Rhuddanian																	440.8
		Ordovician	Late Ordovician	Hirnantian	Kosovian				Harju	Porkuni			Hirnantian	Xiaoxita †/Shikou	Wufeng †						443.8
				Katian	Kralodvorian	Bohdalec †				Pirgu			Chientangkiangian		Wufeng †						445.2
										Pirgu			Neichianshanian/Hanjiang								449.5
										Vormsi											449.6 *
					Berounian					Vormsi											449.7 *
										Nabala	Johvi †										450 *
									Viru	Rakvere											450.6 *
										Oandu											452 *
				Sandbian						Keila	Idavere †										453
										Haljala											453.9
							Zahorany †/Vinice	Letna †		Haljala											456.2 *
										Kukruse											456.4 *
										Uhaku	Aluoja †										457.5 *
						Liben †															458 *
			Middle Ordovician	Darriwilian									Darriwilian	Guniu †/Hulo							458.4
					Dobrotivian																458.5 *
					Dobrotivian					Lasnamagi											458.9 *
					Oretanian					Lasnamagi											459.7 *
										Aseri											460.4 *
						Sarka †				Aseri											461.7 *
									Oeland	Kunda											462.9 *
											Valaste †/Hunderum										464.3 *
														Hunjiang †	Dawan †/Daobaowan/Ningkuo						466.3 *
										Volkhov		Langevoja †/Vaana/Saka									467.1 *
				Dapingian		Klabava †							Dapingian								467.3
					Arenigian																468
										Billingen											469.3 *
			Early Ordovician	Floian									Yiyangian								470
											Latorp †										470.1 *
										Hunneberg											473.7 *
				Tremadocian	Tremadocian								Xinchangian								477.7
															Lianghekou †						477.9 *
										Varangu											481.3 *
Pakerort	482.2 *
Pakerort	Cambrian	Furongian	Stage 10											485.4
														486.3 *
														486.5
			Jiangshanian											489.5
			Paibian											494
		Miaolingian	Guzhangian											497
			Drumian											500.5
			Wuliuan											504.5
		Series 2	Stage 4											509
		Series 2	Stage 3											514
		Terreneuvian	Stage 2											521
		Terreneuvian	Fortunian											529
	Proterozoic	Neoproterozoic	Ediacaran															Vendian			538.8
			Cryogenian															635
			Tonian															720
			Tonian													Karatau		800
		Mesoproterozoic	Stenian													Karatau		1000
			Stenian													Yurmatian		1100
			Ectasian													Yurmatian		1200
			Ectasian													Burzyan		1375
																					1400