Locality	Layer
	Amana	Givetian or Frasnian
	Bird Hill near Rockford	Cerro Gordo Fm.
	Brandon	Independence Shale
	Burlington	Chonopectus Sdst.
	Burlington	Wassonville Lst., between Oolith + Buff
	Des Moines	Middle Coal Measures
	Hackberg Grove	Lime Creek Fm.
	Iowa, unrecorded, southeastern Ia.	Wassonville Limestone