IODP SEDIS - Thesaurus -

Keokuk Limestone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Lower Mississippian
	......Osagian
	.......Keokuk Limestone
RT	Iowa
	Kentucky
	Missouri
	Illinois
SN	Uppermost formation of Osagian Series. Iowa, Illinois, W Kentucky, and E Missouri.