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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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, 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 126864 collections

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International Chronostratigraphic Timescale			Ordovician of China			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										Givetian							382.7
	Middle Devonian	Eifelian										Eifelian							387.7
	Early Devonian	Emsian										Emsian							393.3
		Pragian										Siegen							407.6
		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	Hirnantian	Xiaoxita †/Shikou	Wufeng †			Harju	Porkuni										443.8
		Katian	Chientangkiangian		Wufeng †				Pirgu										445.2
			Neichianshanian/Hanjiang						Pirgu	449.5
									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	Darriwilian	Guniu †/Hulo					Uhaku		458.4
									Lasnamagi		458.9 *
									Aseri		460.4 *
								Oeland	Kunda		462.9 *
										Valaste †/Hunderum	464.3 *
				Hunjiang †	Dawan †/Daobaowan/Ningkuo						466.3 *
									Volkhov		Langevoja †/Vaana/Saka							467.1 *
		Dapingian	Dapingian						Volkhov									467.3
		Dapingian	Dapingian						Billingen									469.3 *
	Early Ordovician	Floian	Yiyangian															470
										Latorp †								470.1 *
									Hunneberg									473.7 *
		Tremadocian	Xinchangian															477.7
					Lianghekou †								477.9 *
									Varangu				481.3 *
									Pakerort				482.2 *
Cambrian	Furongian	Stage 10							Pakerort				485.4
Cambrian	Furongian	Stage 10											486.3 *
																			486.5