When archaeologists finished removing the mound fill, they found the remains of a rectangular enclosure, 49.5 feet long by 26.4 feet wide. Postholes formed the exterior of the enclosure. Investigators also documented three interior postholes, a burned clay floor, an ash bed, a fire-burned basin covered with flat pieces of limestone, and a centrally located pit ringed with clay containing cremated human remains and fragments of copper. Additional human bones and ceramic sherds were found on the enclosure floor. The mound builders would have acquired the copper through trade with groups living in the Great Lakes region.