IODP SEDIS - Thesaurus -

Charles Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Charles Formation
RT	Saskatchewan
	Montana
	North Dakota
	South Dakota
	Madison Group
SN	In Madison Group. Added to Thesaurus in 1989.