Geology of Minnesota Historical

Geology of Minnesota Historical (HM1WU3)

Location: Ortonville, MN 56278 Big Stone County
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Country: United States of America
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N 45° 17.812', W 96° 25.95'

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Inscription

Ortonville Region

Of all the geological agents which have played a part in shaping the face of Minnesota, the most overwhelming and powerful one is glacial ice. At least four times during the last million years, continental glaciers have spread over the state during long periods of cold climate, each advance being followed by widespread retreat.

The last glacier that invaded Minnesota from Canada came by the low valley of the Red River of the north, pushed its way southward across Minnesota and advanced as far as Des Moines. During its slow retreat, 11,000 years ago, the largest glacial river of them all, the Glacial River Warren, formed the valley in which the Minnesota River now flows. This valley, as seen from here is an impressive reminder of the volume of water it once carried.

Big Stone Lake, now the headwaters of the Minnesota river, visible to the northwest, was formed behind a delta-like barrier of sand and silt deposit across this ancient drainage channel by the Whetstone River of South Dakota.
Details
HM NumberHM1WU3
Tags
Year Placed1960
Placed ByGeological Society of Minnesota in Cooperation with Department of Highways State of Minnesota
Marker ConditionNo reports yet
Date Added Tuesday, February 7th, 2017 at 9:03am PST -08:00
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Locationbig map
UTM (WGS84 Datum)14T E 701309 N 5019136
Decimal Degrees45.29686667, -96.43250000
Degrees and Decimal MinutesN 45° 17.812', W 96° 25.95'
Degrees, Minutes and Seconds45° 17' 48.72" N, 96° 25' 57" W
Driving DirectionsGoogle Maps
Area Code(s)320
Closest Postal AddressAt or near 14 US-12, Ortonville MN 56278, US
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