These three alternately beveled knife fragments were recovered from an archeological site in Elk County and donated to the Kansas Historical Society in 1974 and 1975. Knives with a general diamond shape, as is the white fragment, are sometimes called Harahey knives. Archeologists believe that a knife shaped like this would have been used for bison butchering. The other two knife fragments are alternately beveled on two sides. The pinkish color of one knife fragment is a result of the material being carefully heated before manufacturing to improve the chert's knapping qualities. The remaining alternately beveled knife fragment was made of Smoky Hill silicified chalk.