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
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 126762 collections

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International Chronostratigraphic Timescale			Carboniferous of Western Europe		Devonian of Czechoslovakia	Cambrian of Britain		Permian of the Salt Range
Triassic	Early Triassic	Induan						Kathwai	251.5 *
Permian	Lopingian	Changhsingian						Kathwai	251.902
									252.4 *
								Chhidru	252.9 *
		Wuchiapingian						Chhidru	254.14
								Kalabagh	255 *
								Wargal	256 *
	Guadalupian	Capitanian							259.51
		Wordian							264.28
									265.3 *
								Amb	266.1 *
		Roadian						Amb	266.9
		Roadian							270.7 *
	Cisuralian	Kungurian							273.01
		Artinskian							283.5
		Sakmarian							290.1
		Asselian							293.52
		Asselian	Kuzel						297.7
Carboniferous	Pennsylvanian	Gzhelian	Kuzel						298.9
			Stephanian	Stephanian C					300.3 *
				Stephanian B					300.9 *
				Stephanian A					301.4 *
		Kasimovian		Stephanian A					303.7
		Kasimovian		Cantabrian					305 *
		Moscovian		Cantabrian					307
			Westphalian	Westphalian D					307.4 *
				Westphalian C					309.8
				Westphalian B					314.6
		Bashkirian		Westphalian B					315.2
				Westphalian A					317 *
			Namurian	Yeadonian					318.8 *
				Marsdenian					320.2 *
				Kinderscoutian					321.5 *
				Alportian					322 *
				Chokierian					323.1 *
	Mississippian	Serpukhovian		Chokierian					323.2
				Arnsbergian					324 *
				Pendleian					327.4 *
		Visean	Warnantian	Brigantian †					330.9
			Livian	Asbian †					336.3 *
			Moliniacian	Holkerian †/Arundian/Chadian					340.2 *
		Tournaisian	Ivorian						346.7
		Tournaisian	Hastarian						353.7 *
Devonian	Late Devonian	Famennian							358.9
	Late Devonian	Frasnian							372.2
	Middle Devonian	Givetian			Srbsko				382.7
	Middle Devonian	Eifelian			Chotec				387.7
	Early Devonian	Emsian			Daleje/Zlichovian				393.3
		Pragian			Pragian				407.6
		Lochkovian			Lochkovian				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							443.8
		Katian							445.2
		Sandbian							453
	Middle Ordovician	Darriwilian							458.4
	Middle Ordovician	Dapingian							467.3
	Early Ordovician	Floian							470
	Early Ordovician	Tremadocian				477.7
Cambrian	Furongian	Stage 10				Merioneth	Dolgellian/Trempealeauan		485.4
		Stage 10					Festiniogian		489.2 *
		Jiangshanian					Festiniogian		489.5
		Jiangshanian					Maentwrogian		493.1 *
		Paibian					Maentwrogian		494
	Miaolingian	Guzhangian				St Davids			497
		Drumian							500.5
		Wuliuan							504.5
	Series 2	Stage 4				Caerfai			509
	Series 2	Stage 3							514
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian						529
									538.8