Lower Ordovician

Dolostone, sandy to silty dolostone, and sandstone; includes the Shakopee Formation and Oneota Dolomite of the Prairie du Chien Group.
State Minnesota
Name Lower Ordovician
Geologic age Lower Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)dolostone, sandy to silty dolostone.
References

Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.

NGMDB product
Counties Anoka - Blue Earth - Carver - Chisago - Dakota - Dodge - Faribault - Fillmore - Goodhue - Hennepin - Houston - Le Sueur - Martin - Nicollet - Olmsted - Ramsey - Rice - Scott - Sibley - Steele - Wabasha - Waseca - Washington - Winona