1. Mineral Resources
  2. Online Spatial Data
  3. Geology
  4. by state
  5. Minnesota geologic units

Geologic units in Faribault county, Minnesota

Upper Ordovician (Upper Ordovician) at surface, covers 61 % of this area

Limestone, shaley limestone, and dolostone; includes the Maquoketa Formation, and the Stewartville, Prosser, and Cummingsville Formations of the Galena Group. Also includes limestone and dolostone of the Red River Formation, and sandstone and shale of the Winnipeg Formation in northwest Minnesota.

Middle and Upper Ordovician (Middle and Upper Ordovician) at surface, covers 31 % of this area

Shale, dolomitic limestone, and sandstone; includes the Decorah Shale of the Galena Group, the Platteville and Glenwood Formations, and the St. Peter Sandstone.

Lower Ordovician (Lower Ordovician) at surface, covers 8 % of this area

Dolostone, sandy to silty dolostone, and sandstone; includes the Shakopee Formation and Oneota Dolomite of the Prairie du Chien Group.

Upper Cambrian (Upper Cambrian) at surface, covers 0.4 % of this area

Sandstone, siltstone, shale, and dolostone; includes the Jordan Sandstone and St. Lawrence Formation, and the Mazomanie, Lone Rock, and Davis Formations of the Tunnel City Group.