Ishisaji is a type of stone tool made during the Jomon to Yayoi periods (from about 14,000BC to 300 AD), with the first appearance in the incipient Jomon period and it was widespread in the early Jomon period.
縄文時代から弥生時代にかけて見られ、縄文草創期に出現し、早期には普及する。