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Thesaurus

Lower Ordovician
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Ordovician
	....Lower Ordovician
NT	Tremadocian
	Floian
	Arenigian
	Beekmantown Group
	Canadian Series
	El Paso Group
	Ellenburger Group
	Fillmore Formation
	Kindblade Formation
	Kingsport Formation
	Manitou Formation
	Mascot Dolomite
	Oneota Dolomite
	Prairie du Chien Group
	Saint George Group
	Shakopee Formation
	Smithville Formation
RT	Middle Ordovician
	Upper Ordovician
	Pacoota Sandstone
	Arbuckle Group
	San Juan Formation
	Rose Run Sandstone
	Knox Group
	Deadwood Formation