In pre-earthenware culture stone axes were called 'ax-shaped stone tool' or 'elliptic stone tool,' and these were made by striking the nearby spots of flat pebble or broken pieces that big gravel shattered into.
先土器文化における石斧は「斧形石器」「楕円形石器」と呼ばれているが、扁平な円礫あるいは大きな礫を打ち割った剥片の周辺を打撃して形を整えたものである。