Archaeologists uncover massive 1000-year-old Native American fields in Northern Michigan that defy limits of farming
Peer-Reviewed Publication
Updates every hour. Last Updated: 5-Sep-2025 00:11 ET (5-Sep-2025 04:11 GMT/UTC)
With its cold climate, short growing season, and dense forests, Michigan's Upper Peninsula is known as a challenging place for farming. But a new Dartmouth-led study provides evidence of intensive farming by ancestral Native Americans at the Sixty Islands archaeological site along the Menominee River, making it the most complete ancient agricultural site in the eastern half of the United States.The findings are published in Science.
Field and pot fertilization experiments on foxtail millet and common millet further suggest that the millet grain δ15N values can serve as reliable indicators of manuring practices, and the relationship between manuring levels and the δ15N values of archaeological millet remains was proposed. The δ15N values of ancient millet grains suggest widespread and intensive manuring practices in prehistoric North China.