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

Geologic units in Rice county, Minnesota

Lower Ordovician (Lower Ordovician) at surface, covers 45 % of this area

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

Middle and Upper Ordovician (Middle and Upper Ordovician) at surface, covers 39 % 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.

Upper Cambrian (Upper Cambrian) at surface, covers 11 % 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.

Upper Ordovician (Upper Ordovician) at surface, covers 5 % 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.