List of fossiliferous stratigraphic units in Wisconsin

Group or Formation	Period	Notes
Black River Group/Platteville Formation	Ordovician
Black River Group/Platteville Limestone	Ordovician
Brandon Bridge Formation	Silurian
Byron Formation	Silurian
Cedar Valley Group/Little Cedar Formation	Devonian
Decorah Formation	Ordovician
Decorah Shale	Ordovician
Dresbach Formation	Cambrian
Franconia Formation	Cambrian
Galena Formation	Ordovician
Galena Dolomite	Ordovician
Galena Group/Dubuque Formation	Ordovician
Galena Group/Dunleith Formation	Ordovician
Galena Group/Guttenberg Formation	Ordovician
Galena Group/Ion Formation	Ordovician
Galena Group/Spechts Ferry Formation	Ordovician
Galena Group/Wise Lake Formation	Ordovician
Glenwood Formation	Ordovician
Grand Detour Formation	Ordovician
Guttenberg Formation	Ordovician
Ion Formation	Ordovician
Jordan Sandstone	Cambrian
Lake Church Formation	Devonian
Manistique Formation	Silurian
Maquoketa Formation	Ordovician
Maquoketa Group/Brainard Shale Formation	Ordovician
Maquoketa Group/Fort Atkinson Formation	Ordovician
Maquoketa Group/Fort Atkinson Limestone	Ordovician
Maquoketa Group/Neda Formation	Ordovician
Maquoketa Group/Scales Shale Formation	Ordovician
Mayville Formation	Silurian
Mifflin Formation	Ordovician
Milwaukee Formation	Devonian
Nachusa Formation	Ordovician
Oneota Formation	Ordovician
Pecatonica Formation	Ordovician
Platteville Formation	Ordovician
Platteville Group/Grand Detour Formation	Ordovician
Platteville Group/McGregor Formation	Ordovician
Platteville Group/Mifflin Formation	Ordovician
Platteville Group/Pecatonica Formation	Ordovician
Platteville Group/Quimbys Mill Formation	Ordovician
Potsdam Sandstone	Cambrian
Prairie du Chien Group	Ordovician
Quimbys Mill Formation	Ordovician
Racine Formation	Silurian
Racine Dolomite	Silurian
Spechts Ferry Formation	Ordovician
St. Peter Sandstone	Ordovician
Trempealeau Formation	Cambrian
Waukesha Formation	Silurian
Waukesha Dolomite	Silurian

See also

• Paleontology in Wisconsin