According to the Department of the Interior,
The Biesterfeldt Site in Ransom County, North Dakota, is an earth lodge village site culturally identifiable as having been occupied by the Cheyenne Indians ca. 1724-1780. As the only known representative of that relatively brief period in their history during which they pursued a horticultural way of life, the archeological site has the potential to yield critical information on the history of that tribe and various neighboring tribes. Biesterfeldt also has the potential to inform us about the development of Plains Indian culture during a period of intense and dramatic change.
For information on more recent archaeology at the site, see the Archaeological Conservancy.