PBDB Interval Range

449.5 - 413.02 Ma

International Chronostratigraphic Timescale			Ordovician of Britain				Devonian of France
Devonian	Late Devonian	Famennian					Famennian	358.86
	Late Devonian	Frasnian					Frasnian	372.15
	Middle Devonian	Givetian					Givetian	382.31
	Middle Devonian	Eifelian					Couvinien	387.95
	Early Devonian	Emsian					Couvinien	393.47
		Emsian					Coblencien	410.2 *
		Pragian					Coblencien	410.62
		Lochkovian					Gedinnine	413.02
Silurian	Pridoli							419.62
	Ludlow	Ludfordian						422.7
	Ludlow	Gorstian						425
	Wenlock	Homerian						426.7
	Wenlock	Sheinwoodian						430.6
	Llandovery	Telychian						432.9
		Aeronian						438.6
		Rhuddanian						440.5
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian				443.1
		Katian		Rawtheyan				445.2
				Cautleyan				448.8
				Pusgillian				449.2
			Caradoc	Streffordian	Onnian †			449.5
				Cheneyan				451.3
				Burrellian				452.5
		Sandbian						452.8
					Actonian †			453
					Marshbrookian †	Woolstonian †		454
					Longvillian †			455
				Aurelucian	Longvillian †			456.6
				Aurelucian	Soudleyan †/Harnagian/Costonian			457.2
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				458.2
			Llanvirn	Abereiddian/Early Llanvirn				461.1
			Arenig	Fennian				468
		Dapingian		Fennian				469.4
		Dapingian		Whitlandian				470.7
	Early Ordovician	Floian		Whitlandian				471.3
		Floian		Moridunian				473.8
		Tremadocian	Tremadoc	Migneintian				477.1
			Tremadoc	Cressagian				481.1 *
								486.4 *
								486.85