IODP SEDIS - Thesaurus -

Atokan
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Pennsylvanian
	.....Middle Pennsylvanian
	......Atokan
NT	Atoka Formation
RT	Manakacha Formation
	Watahomigi Formation
SN	Provincial series, North America: lower Middle Pennsylvanian. Above Morrowan, below Desmoinesian.