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Thesaurus

Upper Ordovician
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Ordovician
	....Upper Ordovician
NT	Hirnantian
	Katian
	Sandbian
	Ashgillian
	Bighorn Dolomite
	Caradocian
	Cincinnatian
	Cortlandt Complex
	Edenian
	Fairview Formation
	Fernvale Formation
	Fish Haven Dolomite
	Juniata Formation
	Kope Formation
	Maquoketa Formation
	Neda Formation
	Queenston Shale
	Red River Formation
	Reedsville Formation
	Richmond Group
	Utica Shale
	Wufeng Formation
RT	Lower Ordovician
	Middle Ordovician
	Ellis Bay Formation
	Bala
	Tippecanoe Sequence
	Matapedia Group
	Maravillas Formation