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

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 126764 collections

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International Chronostratigraphic Timescale			Ordovician of China			Ordovician of the Baltic				Silurian of the Baltic
Silurian	Pridoli									Ohesaare	419.2
	Pridoli									Kaugetuma	421.7 *
	Ludlow	Ludfordian								Kuressaare	423
		Ludfordian								Paadla	423.4 *
		Gorstian								Paadla	425.6
	Wenlock	Homerian								Rootsikula	427.4
		Homerian								Jaagarahu	429.2 *
		Sheinwoodian								Jaagarahu	430.5
		Sheinwoodian								Jaani	431.8 *
	Llandovery	Telychian								Jaani	433.4
		Telychian								Adavere	434 *
		Aeronian								Adavere	438.5
		Aeronian								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