IODP SEDIS - Thesaurus -

Frontier Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Frontier Formation
RT	Idaho
	Utah
	Wyoming
	Montana
	Colorado
	Colorado Group
	Mancos Shale
	Tununk Member
	Wall Creek Member
SN	In Colorado Group or Mancos Shale. S Montana, and W Wyoming, Colorado, Idaho, Utah.