PBDB Interval

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 127608 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Devonian of France	Permian of the Russian Platform		Carboniferous of North America	Permian of the Pamirs	Ordovician of Britain
Permian	Lopingian	Changhsingian									Dorashamian					251.902
		Wuchiapingian									Dzhulfian					254.14
		Wuchiapingian						Tatarian	Vyatkian		Dzhulfian					256.8 *
	Guadalupian	Capitanian							Severodvinian		Midian					259.51
		Wordian							Urzhumian		Midian					264.28
		Wordian							Urzhumian		Murgabian					266.2 *
		Roadian						Kazanian	Povolzhian							266.9
		Roadian						Kazanian	Sokian							270.7 *
	Cisuralian	Kungurian						Kungurian	Irenian/Ufimian		Kubergandian					273.01
									Filipovian		Kubergandian					276.5 *
									Filipovian		Bolorian					279.8
									Saraninian							280.1 *
		Artinskian						Artinskian	Sarginian							283.5
									Irginian							285.9 *
									Irginian		Yakhtashian					286
									Burtsevian		Yakhtashian					287.8 *
		Sakmarian						Sakmarian	Sterlitamakian		Sakmarian					290.1
		Sakmarian						Sakmarian	Tastubian		Sakmarian					291.7 *
		Asselian						Asselian	Shikhanian	Bursumian †	Asselian					293.52
									Uskalykian							294.8
									Surenian							297.5
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									358.9
	Late Devonian	Frasnian					Frasnian									372.2
	Middle Devonian	Givetian					Givetian									382.7
	Middle Devonian	Eifelian					Couvinien									387.7
	Early Devonian	Emsian														393.3
		Pragian														407.6
		Pragian					Coblencien									408.2 *
		Lochkovian					Gedinnine									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	Harju	Porkuni								Ashgill	Hirnantian			443.8
		Katian		Pirgu									Rawtheyan			445.2
													Cautleyan			448.9 *
													Pusgillian			449.3 *
				Vormsi								Caradoc	Streffordian	Onnian †		449.6 *
				Nabala	Johvi †											450 *
			Viru	Rakvere												450.6 *
				Rakvere									Cheneyan			451.5 *
				Oandu									Cheneyan			452 *
				Oandu									Burrellian			452.7 *
		Sandbian		Keila	Idavere †											453
				Keila										Actonian †		453.2 *
				Haljala										Actonian †		453.9
														Marshbrookian †	Woolstonian †	454.2 *
						Longvillian †								455.2 *
				Kukruse										456.4 *
													Aurelucian	456.8 *
						Soudleyan †/Harnagian/Costonian									457.4 *
				Uhaku	Aluoja †	Soudleyan †/Harnagian/Costonian									457.5 *
	Middle Ordovician	Darriwilian		Uhaku		Llanvirn						Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
				Lasnamagi											458.9 *
				Aseri											460.4 *
				Aseri								Abereiddian/Early Llanvirn			461.3 *
			Oeland	Kunda											462.9 *
				Kunda	Valaste †/Hunderum										464.3 *
				Volkhov											Langevoja †/Vaana/Saka	467.1 *
		Dapingian														467.3
						Arenig						Fennian				468.4 *
				Billingen												469.3 *
	Early Ordovician	Floian														470
					Latorp †											470.1 *
												Whitlandian				471.1 *
				Hunneberg								Whitlandian				473.7 *
												Moridunian				474.3 *
		Tremadocian				Tremadoc						Migneintian				477.7
								Cressagian	480.8 *
				Varangu					481.3 *
				Pakerort					482.2 *
									485 *
Cambrian	Furongian	Stage 10							485.4
Cambrian	Furongian	Stage 10							486.3 *
																486.5