Geology of Minnesota

Geology of Minnesota (HMRAK)

Location: Minneapolis, MN 55417 Hennepin County
Country: United States of America

N 44° 54.92', W 93° 12.575'

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Inscription

Minnehaha Falls

Near Fort Snelling, 10,000 years ago, melt water from the Wisconsin glacier was discharged through the Mississippi River and plunged over a ledge of Platteville limestone into a gorge cut chiefly in the white St. Peter sandstone. The undercutting action in the soft sandstone caused the limestone ledge to break off with a vertical face, thus maintaining the falls, while causing them to retreat upstream. When the falls in the main channel passed the upper end of the island-where the Soldiers Home now stands-the entire flow in the river was diverted to the main gorge and the falls in the west channel were abandoned. This unique and unusual geologic feature, an abandoned waterfall, is located at the north end of the former west channel which lies 200 feet east of this tablet.

The cataract in the Mississippi has migrated to St. Anthony Falls and Minnehaha has retreated from the abandoned channel to its present location, where the undercutting action responsible for the migration is apparent.

Erected by the Geological Society of Minnesota
in cooperation with the Board of Park Commissioners
City of Minneapolis - 1953
Details
HM NumberHMRAK
Tags
Year Placed1953
Placed ByThe City of Minneapolis
Marker ConditionNo reports yet
Date Added Wednesday, September 24th, 2014 at 9:43am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)15T E 483457 N 4973566
Decimal Degrees44.91533333, -93.20958333
Degrees and Decimal MinutesN 44° 54.92', W 93° 12.575'
Degrees, Minutes and Seconds44° 54' 55.20" N, 93° 12' 34.50" W
Driving DirectionsGoogle Maps
Area Code(s)651, 612
Closest Postal AddressAt or near 5001 Minnehaha Ave, Minneapolis MN 55417, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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