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International chronostratigraphic chart: Paleozoic

Based on the 2024 version

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Last updated: December 17, 2025

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First submitted	December 17, 2025
Times taken	10
Average score	20.3%
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System / Period	Series / Epoch	Subseries / subepoch	Stage / Age	Numerical age (Ma)
Cambrian	Terrenuevian		Fortunian	538.8 ± 0.6
	Terrenuevian		Stage 2	529
	Series 2		Stage 3	521
	Series 2		Stage 4	514.5
	Miaolingian		Wulian	506.5
			Drumian	504.5
			Guzhangian	500.5
	Furongian		Paibian	497
			Jiangshanian	494.2
			Stage 10	491
Ordovician	Lower		Tremadocian	486.85 ± 1.5
	Lower		Floian	477.1 ± 1.2
	Middle		Dapingian	471.3 ± 1.4
	Middle		Darriwilian	469.4 ± 0.9
	Upper		Sandbian	458.2 ±0.7
			Katian	452.8 ±0.7
			Hirnantian	445.2 ±0.9
Silurian	Llandovery		Rhuddanian	443.1 ±0.9
			Aeronian	440.5 ±1.0
			Telychian	438.6 ±1.0
	Wenlock		Sheinwoodian	432.9 ±1.2
	Wenlock		Homerian	430.6 ±1.3
	Ludlow		Gorstian	426.7 ±1.5
	Ludlow		Ludfordian	425.0 ±1.5
	Pridoli			422.7 ±1.6
Devonian	Lower		Lochkovian	419.62 ±1.36
			Pragian	413.02 ±1.91
			Emsian	410.62 ±1.95
	Middle		Eifelian	393.47 ±0.99
	Middle		Givetian	387.95 ±1.04
	Upper		Frasnian	382.31 ±1.36
	Upper		Famennian	372.15 ±0.46
Carboniferous	Mississippian	Lower	Tournaisian	358.86 ±0.19
		Middle	Visean	346.7 ±0.4
		Upper	Serpukhovian	330.3 ±0.4
	Pennsylvanian	Lower	Bashkirian	323.4 ±0.4
		Middle	Moscovian	315.2 ±0.2
		Upper	Kasimovian	307.0 ±0.1
		Upper	Gzhelian	303.7 ±0.1
Permian	Cisuralian		Asselian	298.9 ±0.15
			Sakmarian	293.52 ±0.17
			Artinskian	290.1 ±0.26
			Kungurian	283.3 ±0.4
	Guadalupian		Roadian	274.4 ±0.4
			Wordian	266.9 ±0.4
			Capitanian	264.28 ±0.16
	Lopingian		Wuchiapingian	259.51 ±0.21
	Lopingian		Changhsingian	254.14 ±0.07

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