These two large bifaces were both recovered from Riley County. The largest biface was donated to the Kansas Historical Society in 1880 and is made from Florence chert. Its pink cast comes from being heat-treated, a process to improve the knapping qualities of a chert. The small biface, though thicker and not heat-treated, is also made of Florence chert. It was donated to the Kansas Historical Society in 1925 and carries a label which reads "Spearhead found on the (unreadable word) on College Hill Riley Co KS."