The Geology of Southeastern Minnesota
The face of Minnesota has undergone many changes over the centuries as a result of the forces of nature. Its present appearance is the result of modification over four glacial periods that have created the landscape you see along the roadways. These glaciers were masses of moving ice and snow that covered the surface of Minnesota at various times during the past 2 million years. The last, called the Wisconsin, melted away some 10,000 years ago.
As you travel east and descend into the Mississippi River valley, you will notice that the terrain changes. This corner of the state is the driftless area, an area that was not covered by the last glacier. Here you will find no natural lakes, and the deep valleys and towering bluffs are the end result of the erosion caused by the melt-waters of the glacier, located to the north and west. The extreme southeastern corner may never have been glaciated, just like the southwestern corner of Wisconsin.
As you travel through the valley you will notice in the roadcuts and bluffs, exposures of limestone, sandstone and dolomite. These rock formations were deposited by oceans which have covered
The rich soil, and the natural beauty of the area attracted first settlers, and later tourists. Numerous trails have been developed for use by both residents and visitors, allowing them the opportunity to enjoy and explore the geology of the area.
Erected 1998 by Minnesota Historical Society.
Location. 43° 55.897′ N, 91° 51.162′ W. Marker is near Lewiston , Minnesota, in Winona County. Marker is on Interstate 90 at milepost 244, 1.9 miles east of County Road 29. Marker is located at the Enterprise Rest Area on I-90 Eastbound. Touch for map. Marker is at or near this postal address: I-90 E, Lewiston MN 55952, United States of America. Touch for directions.
Other nearby markers. At least 6 other markers are within 16 miles of this marker, measured as the crow flies. Potters' Field (approx. 12 miles away); Stephen Taylor (approx. 12.2 miles away); Winona: River Village, Lumber Town, College Town (approx. 12.3 miles away); Garvin Heights
Categories. • Environment •
More. Search the internet for The Geology of Southeastern Minnesota.
Credits. This page was last revised on October 12, 2019. This page originally submitted on October 11, 2019, by Ruth VanSteenwyk of Aberdeen, South Dakota. This page has been viewed 38 times since then. Photos: 1, 2, 3. submitted on October 11, 2019, by Ruth VanSteenwyk of Aberdeen, South Dakota. • Mark Hilton was the editor who published this page.