Franconia Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Cambrian
 ....Upper Cambrian
 .....Franconia Formation
RTIllinois
 Wisconsin
 Minnesota
SNIncludes Woodhill, Birkmose, Tomah, Reno and Mazomanie members. N Illinois, SE Minnesota, and SW Wisconsin. Indexed with states as applicable.