PBDB Interval Range

Skullrockian age - Tulean age

488.9 - 475.3 Ma

International Chronostratigraphic Timescale			Ordovician of North America
Quaternary	Holocene	Meghalayan							0
		Northgrippian							0.0042
		Greenlandian							0.0082
	Pleistocene	Late Pleistocene							0.0117
		Chibanian							0.129
		Calabrian							0.774
		Gelasian							1.8
Neogene	Pliocene	Piacenzian							2.58
	Pliocene	Zanclean							3.6
	Miocene	Messinian							5.333
		Tortonian							7.246
		Serravallian							11.63
		Langhian							13.82
		Burdigalian							15.98
		Aquitanian							20.45
Paleogene	Oligocene	Chattian							23.04
	Oligocene	Rupelian							27.3
	Eocene	Priabonian							33.9
		Bartonian							37.71
		Lutetian							41.03
		Ypresian							48.07
	Paleocene	Thanetian							56
		Selandian							59.24
		Danian							61.66
Cretaceous	Late Cretaceous	Maastrichtian							66
		Campanian							72.2
		Santonian							83.6
		Coniacian							85.7
		Turonian							89.8
		Cenomanian							93.9
	Early Cretaceous	Albian							100.5
		Aptian							113.2
		Barremian							121.4
		Hauterivian							125.77
		Valanginian							132.6
		Berriasian							137.05
Jurassic	Late Jurassic	Tithonian							143.1
		Kimmeridgian							149.2
		Oxfordian							154.8
	Middle Jurassic	Callovian							161.5
		Bathonian							165.3
		Bajocian							168.2
		Aalenian							170.9
	Early Jurassic	Toarcian							174.7
		Pliensbachian							184.2
		Sinemurian							192.9
		Hettangian							199.5
Triassic	Late Triassic	Rhaetian							201.4
		Norian							205.7
		Carnian							227.3
	Middle Triassic	Ladinian							237
	Middle Triassic	Anisian							241.464
	Early Triassic	Olenekian							246.7
	Early Triassic	Induan							249.9
Permian	Lopingian	Changhsingian							251.902
	Lopingian	Wuchiapingian							254.14
	Guadalupian	Capitanian							259.51
		Wordian							264.28
		Roadian							266.9
	Cisuralian	Kungurian							274.4
		Artinskian							283.3
		Sakmarian							290.1
		Asselian							293.52
Carboniferous	Pennsylvanian	Gzhelian							298.9
		Kasimovian	303.7
		Moscovian	307
		Bashkirian	315.2
	Mississippian	Serpukhovian	323.4
		Visean	330.3
		Tournaisian	346.7
Devonian	Late Devonian	Famennian	358.86
	Late Devonian	Frasnian	372.15
	Middle Devonian	Givetian	382.31
	Middle Devonian	Eifelian	387.95
	Early Devonian	Emsian	393.47
		Pragian	410.62
		Lochkovian	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	Cincinnatian	Gamachian	443.1
		Katian		Gamachian	445.2
				Richmondian	445.5
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.6
				Edenian		450.2
			Mohawkian	Chatfieldian		451
		Sandbian		Chatfieldian		452.8
				Turinian		453.8
			Whiterockian		Canadian †	Chazyan †/Marmor	457.3
	Middle Ordovician	Darriwilian					458.2
		Dapingian					469.4
		Dapingian		Rangerian			470.3
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	471.3
		Floian		Tulean				475.3 *
		Tremadocian		Tulean				477.1
				Stairsian				481.7 *
				Skullrockian/Demingian				483.4 *
								486.85 *
									488.9