The Southeast mound area was occupied from the Archaic period (9,600 B.C.E. - 1,000 B.C.E.) through the Mississippian period (900 C.E. - 1540 C.E.). Archeologists found evidence of prehistoric burials, plain pottery, stone projectile points, and chipped stones. The mound's oval shape suggests that it was heavily damaged by erosion and plowing. Today, the mound measures 30 x 50 feet and 3 feet high. It was likely built during the last years of the Mississippian period because it is located 200 feet outside the village's fortification walls, and during the late Mississippian period the village may have expanded beyond the original fortification walls.