Type	Region
	Layer	Atoka Fm.
	Layer	Belle City Lst. of Seminole Fm.
	Layer	Belle Plains Fm.
	Layer	Cherokee Fm.
	Layer	Cherry Valley Lst.
	Layer	Cherry Valley Lst.
	Layer	Cherry Valley Lst.
	Layer	Cherry Valley Lst.
	Layer	Cherry Valley Lst.
	Layer	Coal Measures ?
	Layer	Coal Measures,unrecognised
	Layer	Devonian
	Layer	do I
	Layer	Gaptank Fm., near top
	Layer	Gaptank Fm., near top
	Layer	Graford Fm.
	Layer	Graford Fm.
	Layer	Graham Fm.
	Layer	Graham Fm.
	Layer	Graham Fm.
	Layer	Graham Fm.
	Layer	Graham Fm.
	Layer	Hunsrück Shale
	Layer	Iatan Lst. of Pedee Group
	Layer	Knobstone Group
	Layer	LaSalle Fm. of McLeansboro Group
	Layer	Maokou Fm., undifferentiated
	Layer	Middle Coal Measures
	Layer	Middle Coal Measures
	Layer	Middle Coal Measures, Des Moines Fm.
	Layer	Middle Devonian
	Layer	Millsap Lake Fm., Kickapoo Falls Lst.
	Layer	Nelagoney Fm.
	Layer	Nellie Bly Fm.
	Layer	Onondaga M. of Romney Fm.
	Layer	P1a
	Layer	Seminole Fm.
	Layer	Stranger Fm. of Douglas Group
	Layer	Timorites Zone
	Layer	unrecognized
	Layer	Upper Coal Measures
	Layer	Upper Coal Measures
	Layer	Upper Devonian
	Layer	upper Strawn
	Layer	Visean
	Layer	Visean
	Layer	Zhigulevskian