Late Archaic Period: Excavating deeper into the Late Rodgers layer (Lopinot et al. 1998:76), 1 to below the surface, remains can be found of the Late Archaic period, dating from 2,500 to 5,500 years BP (CAR 2006). A number of lithic tools and points have been recovered from this period, including Sedalia complex points and knives of nonheat-treated Jefferson City chert. A midden deposit at 2.3 to 2.6 meters below the surface has yielded Williams Corner-Notched bifaces. Additional finds have included animal and plant remains, nutting stones, metates, faceted hematite, and stone tools of heat-treated Burlington chert. Uncorrected AMS dates have given results of 4020+/-80 years BP (Ray et al. 1998:77).