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In lithic reduction, the striking platform is the surface on the proximal portion of a lithic flake on which the detachment blow fell;〔Kooyman, Brian Patrick. ''Understanding Stone Tools and Archaeological Sites''. University of Calgary Press, 2000, p. 12.〕 this may be natural or prepared. Types of striking platforms include: * Cortex, which consists of an area of cortex used as a platform during initial reduction; * Single-faceted, consisting of a flat platform at right angles to the dorsal surface of the flake and most often associated with conchoidal fractures; * Double-faceted, a variety of multifaceted, prepared platform, also characteristically flat and associated with conchoidal fractures; * Multifaceted, with three or more facets to the platform; * Lipped, a platform type resulting from soft hammer biface reduction; and * Crushed, which occurs when the platform was crushed beyond easy recognition by the detachment blow. ==Notes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Striking platform」の詳細全文を読む スポンサード リンク
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