Near Ramsey in Anoka County, Minnesota — The American Midwest (Upper Plains)
Ice Age Souvenir
—Great River Road Minnesota —
Twenty thousand years ago, a great sheet of ice, the Superior lobe, covered this area. At its farthest advance, it formed the St. Croix moraine, a series of high hills to the west, south, and east. When it melted, it left behind vast deposits of gravel, sand, and clay.
The Anoka Sand Plain
After the Superior lobe retreated, another glacier, the Grantsburg sublobe, moved in from the southwest, filling the lowlands with ice. Again the climate warmed, melting the ice and creating a lake that covered most of Anoka County – including this spot. Fine sand carried in the meltwater settled to the bottom. The lake disappeared when its water found an outlet into the Mississippi River, leaving the Anoka Sand Plain, an expanse of sand measuring 2,200 square km (850 square miles).
Dunes and Bogs
Beginning about eight thousand years ago, drier weather and wind formed sand dunes in some areas of the Anoka Sand Plain. Dunes often rise 9m (30 ft) or more above the surrounding land. Meanwhile, low-lying areas of the glacial lake basin are gradually filling up with organic matter and evolving into bogs.
Kettle Lakes and Outwash Plains
As the glaciers retreated, they left behind huge blocks of ice buried by gravel, sand, and clay. When the
Erected 1995 by Minnesota Department of Natural Resource Great River Road marker program.
Location. 45° 14.743′ N, 93° 30.281′ W. Marker is near Ramsey, Minnesota, in Anoka County. Marker is on U.S. 10 0.8 miles east of Cleveland Street, on the right when traveling east. Touch for map. Marker is in the eastbound Dayton Port Rest Area / Itasca Wayside along the Mississippi River. Marker is at or near this postal address: 95511 U.S. Highway 10, Anoka MN 55303, United States of America.
Other nearby markers. At least 8 other markers are within 7 miles of this marker, measured as the crow flies. Itasca Village Townsite (within shouting distance of this marker); Grange Shrine (approx. 1.9 miles away); Geology of the Elk River Region (approx. 4.3 miles away); Rum River Dam (approx. 6.4 miles away); Perseverance Needed (approx. 6.4 miles away); The Stone House / Robert W. Akin (approx. 6.4 miles away); Why Settle Here? / Time to Play (approx. 6½ miles away); The Gathering Place (approx. 6½ miles away).
More about this marker. There are two maps on the northern
Also see . . .
1. Glacial history of Minnesota. Wikipedia entry. (Submitted on November 18, 2013.)
2. Natural History: Minnesota's Geology. Minnesota Department of Natural Resources. (Submitted on November 18, 2013.)
3. Minnesota Department of Transportation. Historic Roadside Development Structures Inventory. (Submitted on November 18, 2013.)
Categories. • Natural Features •
Credits. This page was last revised on June 16, 2016. This page originally submitted on November 18, 2013, by Keith L of Wisconsin Rapids, Wisconsin. This page has been viewed 479 times since then. Photos: 1, 2, 3, 4. submitted on November 18, 2013, by Keith L of Wisconsin Rapids, Wisconsin.