Published online by Cambridge University Press: 20 January 2017
The Old Fort (23SA104), an earthwork enclosure and mound complex on a high ridge near the Missouri River in central Missouri, has long been considered a Middle Woodland or Hopewell construction. Excavations in 1970 cross-trenched prehistoric ditches and embankments on the north end of the enclosure. A well-developed soil profile containing predominantly Middle Woodland pottery was exposed, into which aboriginal ditches had been cut. Oneota pottery lay on the floors of these ditches, embedded in a thin laminated horizon of alluvium. Oneota and Middle Woodland pottery are mixed in ditch fills. Field data, although limited, thus support the identification of the enclosure as Oneota, aboriginally constructed on a Middle Woodland habitation site.