The Hackberry archaeological site is located north of Pawnee in an area one half mile east of Oliver in the Cessna Park area. The site is a multi-component site which contains the archeological remains in the lower stratum dating to Early Ceramic times (circa A.D. 1 to A. D. 1,000) and an upper level that may be affiliated with the Middle or Late Ceramic occupation (800-1,600 A. D.) of the Arkansas River Valley. This site is on record in the Kansas State Historical Society as a prehistoric bison kill site.