Stone circles are commonly found on the plains. Most are remains of a tipi location after the poles and cover have been removed. Artifacts and hearths in the interiors confirm that the majority of these features are the locations of habitation structures. Most habitation circles range in size from 12 to 24 feet (3.6 to 7.3 meters) in outside diameter. Smaller or larger stone circles usually are considered for other functions, such as small menstrual huts and large dance rings.

Greer photo 1999

Project 6012, southeastern Wyoming USA
Tipi Ring.