IODP SEDIS - Thesaurus -

Ravalli Group
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Mesoproterozoic
	....Ravalli Group
RT	Idaho
	Montana
	Altyn Limestone
	Belt Supergroup
	Revett Quartzite
	Saint Regis Formation
SN	Of Belt Supergroup. Includes Altyn Formation, Appekunny Formation, Grinnell Formation. NE Idaho, and NW Montana.