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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ten Million Year Bins	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Ordovician 5	Harju	Porkuni			443.8
		Katian			Pirgu			445.2
					Vormsi			449.6 *
					Nabala	Johvi †		450 *
				Viru	Rakvere			450.6 *
					Oandu			452 *
		Sandbian	Ordovician 4		Keila	Idavere †		453
					Haljala			453.9
					Kukruse			456.4 *
					Uhaku	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian	Ordovician 3		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	Ordovician 2		Volkhov			467.3
		Dapingian			Billingen			469.3 *
	Early Ordovician	Floian						470
						Latorp †		470.1 *
					Hunneberg			473.7 *
		Tremadocian	Ordovician 1		Hunneberg			477.7
					Varangu			481.3 *
					Pakerort			482.2 *
								485.4 *
								486.3
								486.5