First, a raw stone (base rock material) is cracked roughly into round slices to prepare the preform for the lithic core, after which the raw material is processed to form a lithic core, which is then struck consistently from the same direction to remove all same-sized vertical lithic flakes from the core.
まず、原石（母岩石材）を輪切り状に大きく荒割りして打面を準備し、石核の素材をつくり出したのちに調整加工を加えて石核を作り、これを連続的に同一方向から加撃してほぼ同じ大きさの縦長剥片を打ちはがしていく。