The Great Bend
Posted by: Groundspeak Regular Member GPX Navigators
N 43° 30.054 W 096° 45.084
14T E 681786 N 4818897
Quick Description: A highland existed along the east side of South Dakota long before the Ice Age began.
Location: South Dakota, United States
Date Posted: 7/8/2006 12:57:04 PM
Waymark Code: WMGQ7
Published By: Groundspeak Premium Member MNSearchers
Views: 27

Long Description:
A highland existed along the east side of South Dakota long before the Ice Age began 2 million yrs. ago. Successive periods of glaciation deposited sediment across the highland and increased its elevation.

The last glaciation began 35,000 years ago during the late Wisconsin Stage. By then the highland had become a barrier that divided the ice sheet into 2 south flowing lobes: the James Lobe to the west and the Des Moines Lobe to the east. When the James lobe reached the nearby southwest corner of the highland, it turned to flow east.

In time the glacier began to recede. Meltwater flowing south down the Skunk Creek and Big Sioux River valleys was dammed by the James lobe, causing it to overflow east to Tuthill Park. There it was diverted several miles north before joining the Slip-up and Split Rock creeks and then resuming its southerly flow. In the manner the Great Bend of the Big Sioux River was created by the James Lobe about 15,000 years ago.

Glacial deposits overlay the flatiron-shaped highland that is now called Coteau des Prairies.
Marker Name: The Great Bend

Marker Type: City

Marker Text:
The Slip up creek joined Split Rock and changed course of Big Sioux moved flow East toward modern day Tuthill Park. Slow flow rather than the quick flow if hadn't changed.

Visit Instructions:
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Recent Visits/Logs:
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OpusTerra visited The Great Bend 7/27/2014 OpusTerra visited it
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Cach 22 visited The Great Bend 5/31/2008 Cach 22 visited it
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