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
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 126973 collections

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International Chronostratigraphic Timescale			Devonian of Czechoslovakia	Silurian of England		Ordovician of the Baltic				Devonian of Germany	Permian of the Pamirs	Permian of North America		Silurian of the Baltic	Carboniferous of North America	Permian of the Salt Range
Triassic	Early Triassic	Induan														Kathwai	251.5 *
Permian	Lopingian	Changhsingian									Dorashamian					Kathwai	251.902
																	252.4 *
																Chhidru	252.9 *
		Wuchiapingian									Dzhulfian					Chhidru	254.14
																Kalabagh	255 *
																Wargal	256 *
	Guadalupian	Capitanian									Midian	Capitanian					259.51
		Wordian										Wordian					264.28
																	265.3 *
																Amb	266.1 *
											Murgabian						266.2 *
		Roadian										Roadian					266.9
		Roadian										Roadian					270.7 *
	Cisuralian	Kungurian									Kubergandian	Leonardian	Cathedralian				273.01
											Bolorian		Cathedralian				279.8
													Hessian				281.9 *
		Artinskian															283.5
											Yakhtashian						286
											Yakhtashian	Wolfcampian	Lenoxian				286.1 *
		Sakmarian									Sakmarian		Lenoxian				290.1
		Asselian									Asselian		Nealian		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								Wocklum/Dasberg/Hemberg/Nehden							358.9
	Late Devonian	Frasnian								Adorf							372.2
	Middle Devonian	Givetian	Srbsko							Givetian							382.7
	Middle Devonian	Eifelian	Chotec							Eifelian							387.7
	Early Devonian	Emsian	Daleje/Zlichovian							Emsian							393.3
		Pragian	Pragian							Siegen							407.6
		Lochkovian	Lochkovian							Gedinnine							410.8
Silurian	Pridoli			Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine									Ohesaare			419.2
					Bringewood/Elton									Ohesaare			421.3
					Bringewood/Elton									Kaugetuma			421.7 *
	Ludlow	Ludfordian		Coalbrookdale	Wenlock (England)/Tickwood									Kuressaare			423
		Ludfordian			Wenlock (England)/Tickwood									Paadla			423.4 *
		Gorstian															425.6
		Gorstian			Buildwas												426.4 *
	Wenlock	Homerian			Buildwas									Rootsikula			427.4
				Wych	Woolhope									Rootsikula			428.4 *
														Jaagarahu			429.2 *
		Sheinwoodian												Jaagarahu			430.5
		Sheinwoodian												Jaani			431.8 *
	Llandovery	Telychian												Jaani			433.4
														Adavere			434 *
																	436.3 *
		Aeronian															438.5
				Cowleigh Park													439.3 *
														Raikkula			439.4 *
		Rhuddanian												Raikkula			440.8
		Rhuddanian												Juuru			441.4 *
Ordovician	Late Ordovician	Hirnantian				Harju	Porkuni										443.8
		Katian					Pirgu										445.2
							Vormsi	449.6 *
							Nabala	Johvi †	450 *
						Viru	Rakvere		450.6 *
							Oandu		452 *
		Sandbian					Keila	Idavere †	453
							Haljala		453.9
							Kukruse		456.4 *
							Uhaku	Aluoja †	457.5 *
	Middle Ordovician	Darriwilian					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					Volkhov									467.3
		Dapingian					Billingen									469.3 *
	Early Ordovician	Floian														470
								Latorp †								470.1 *
							Hunneberg									473.7 *
		Tremadocian					Hunneberg									477.7
							Varangu									481.3 *
							Pakerort									482.2 *
Cambrian	Furongian	Stage 10					Pakerort				485.4
Cambrian	Furongian	Stage 10									486.3 *
																	486.5