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Thesaurus

Middle Ordovician
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Ordovician
	....Middle Ordovician
NT	Darriwilian
	Stage 3
	Ammonoosuc Volcanics
	Bigby-Cannon Limestone
	Bigfork Chert
	Black River Group
	Blackriverian
	Bromide Formation
	Champlainian
	Chazy Group
	Chazyan
	Cloridorme Formation
	Decorah Shale
	Dubuque Formation
	Everton Formation
	Galena Dolomite
	Glenwood Shale
	High Bridge Group
	Holston Formation
	Lenoir Limestone
	Lexington Limestone
	Llandeilian
	Llanvirnian
	Millbrig Bentonite Bed
	Normanskill Formation
	Partridge Formation
	Platteville Formation
	Saint Peter Sandstone
	Schenectady Formation
	Shadow Lake Formation
	Simpson Group
	Stones River Group
	Swan Peak Formation
	Table Head Group
	Trentonian
	Whiterockian
	Winnipeg Formation
	Woods Hollow Shale
RT	Lower Ordovician
	Upper Ordovician
	Bala
	Tippecanoe Sequence