PBDB Interval Range

477.1 - 457.3 Ma

International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Kosovian				Cincinnatian	Gamachian				443.1
		Katian	Kralodvorian	Bohdalec †				Gamachian				445.2
								Richmondian				445.5
								Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.6
			Berounian					Maysvillian				450.1 *
								Edenian				450.2
							Mohawkian	Chatfieldian				451
		Sandbian						Chatfieldian				452.8
								Turinian				453.8
					Zahorany †/Vinice	Letna †	Whiterockian		Canadian †	Chazyan †/Marmor		457.3 *
	Middle Ordovician	Darriwilian			Zahorany †/Vinice							458.2
				Liben †								459.3 *
			Dobrotivian									459.7 *
			Oretanian									461 *
			Oretanian	Sarka †								463.3 *
			Arenigian	Sarka †								468
		Dapingian		Klabava †								469.4
		Dapingian						Rangerian				470.3
	Early Ordovician	Floian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	471.3
		Floian						Tulean				475.3 *
		Tremadocian	Tremadocian					Tulean				477.1
								Stairsian				481.7 *
								Skullrockian/Demingian				483.4 *
												486.85 *
												488.9