The Franconia Formation is a geologic formation in the upper mid-western United States, with outcroppings found in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, and Wisconsin.
[1] It preserves fossils dating back to the Cambrian period.
It was named the Franconia Formation due to the first published documentation of exposures in vicinity of Franconia, Minnesota[1] in the 1897 Ph.D. dissertation by Charles P. Berkley at the University of Minnesota titled Geology of the St. Croix Dalles.
[2] The Franconian stratigraphic stage was named after this formation.
This article about a specific stratigraphic formation in Wisconsin is a stub.