Indigenous Americans dragged, carried or floated 5-ton tree more than 100 miles to North America's largest city north of Mexico 900 years ago Researchers have determined the age and origin of a massive tree that was found at the pre-Columbian city of Cahokia in what is now Illinois.

"The Mitchell Log is the largest marker post of its kind in Cahokia. Marker posts were important monuments in Cahokia, but researchers still aren't sure when the people of Cahokia erected and, finally, stopped placing these large logs."
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