IODP SEDIS - Thesaurus -

Montana Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Montana Group
RT	New Mexico
	Utah
	Wyoming
	Montana
	Colorado
	North Dakota
	Bearpaw Formation
	Kansas
	South Dakota
	Cody Shale
	Eagle Sandstone
	Fox Hills Formation
	Pierre Shale
	Judith River Formation
	Parkman Sandstone
	Two Medicine Formation
SN	Includes Bearpaw Shale, Claggett Shale, Cody Shale (upper part), Eagle Sandstone, Fox Hills Sandstone, Horsethief Sandstone, Judith River Formation, Lennep Sandstone, Parkman Sandstone, Pierre Shale, Trinidad Sandstone, Two Medicine Formation, and Virgell