From the end of pre-earthenware period to the beginning of the Jomon period, single-edged mikoshiba-style stone axes that assumed the sectional triangular or semi cylindrical shapes became popular.
先土器時代の末期から縄文時代の草創期にかけては断面三角形またはカマボコ形を呈する片刃の御子柴型石斧が盛行する。