Lower Ordovician rocks, undivided (MNOl;0)

Lower Ordovician rocks, undivided - Shakopee and Oneota Formations of the Prairie du Chien Group in the Hollandale embayment of southeastern Minnesota. Unit consists dominantly of dolostone and dolomitic limestone. The Shakopee also contains intervals of quartz arenite, including a pronounced basal unit named the New Richmond Member

State	Minnesota
Name	Lower Ordovician rocks, undivided
Geologic age	Lower Ordovician
Original map label	Ol
Primary rock type	dolostone (dolomite)
Secondary rock type	limestone
Other rock types	sandstone
Lithologic constituents	Major Sedimentary > Carbonate > Limestone Sedimentary > Carbonate > Dolostone Minor Sedimentary > Clastic > Sandstone > Arenitequartz arenite
Map references	Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm [http://www.geo.umn.edu/mgs/currentpubs.htm]
Unit references	Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm [http://www.geo.umn.edu/mgs/currentpubs.htm]
Geographic coverage	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