 Archaeological investigations, conducted in the late 1960s by Dr. George Frison of the University of Wyoming, indicated that the trap was likely in use before 1850; although its length of service is unknown, it is believed that the site is associated with Indians of the Late Prehistoric Period.The Indians' technique, when hunting antelope, was to drive a herd into the long entrance of traps similar to this one.The entrance, made of juniper wood, led to the trap proper, which was located at the base of a hill.