IODP SEDIS - Thesaurus -

Imo Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Upper Mississippian
	......Chesterian
	.......Imo Formation
RT	Oklahoma
	Illinois
	Arkansas
SN	Before 1989, also search Imo Shale AND United States. Added to Thesaurus in 1989.