IODP SEDIS - Thesaurus -

Jefferson Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Upper Devonian
	.....Jefferson Group
RT	Idaho
	Utah
	Wyoming
	Montana
	Birdbear Formation
	Duperow Formation
SN	Montana, Idaho, N Utah and W Wyoming. Added to Thesaurus in 1985.