翻訳と辞書 Words near each other ・ Prism spectrometer ・ Prism TV ・ Prisma ・ Prisma (disambiguation) ・ Prisma (magazine) ・ PRISMA (spacecraft) ・ Prisma Energy International ・ Prisma Volley ・ Prismacolor ・ Prismane ・ Prismanes ・ PrismaStar ・ Prismata ・ Prismatic (app) ・ Prismatic (disambiguation) ・ Prismatic blade ・ Prismatic compass (surveying) ・ Prismatic compound of antiprisms ・ Prismatic compound of antiprisms with rotational freedom ・ Prismatic compound of prisms ・ Prismatic compound of prisms with rotational freedom ・ Prismatic joint ・ Prismatic surface ・ Prismatic uniform polychoron ・ Prismatic uniform polyhedron ・ Prismatoid ・ Prismatomeris ・ Prismatomeris andamanica ・ Prismatoolithidae ・ Prismatoolithus Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Prismatic blade ： ウィキペディア英語版 Prismatic blade In archaeology, a prismatic blade is a long, narrow, specialized stone flake tool with a sharp edge, like a small razor blade.〔Hester ''et al.'' (1971)〕 Prismatic blades are flaked from stone cores through pressure flaking. This process results in a very standardized finished tool and waste assemblage. Obsidian use was widespread in Mesoamerica, and obsidian blades were often produced, though chert, flint, and chalcedony blades are not uncommon. Prismatic blades were used for cutting and scraping, and have been reshaped into other tool types, such as projectile points and awls. ==Morphology== Prismatic blades are often trapezoidal in cross section, but very close in appearance to an isosceles trapezoid. Triangular blades (in cross-section) are also common. The ventral surface of the prismatic blade is very smooth, sometimes bearing slight rippling reflecting the direction of applied force and a very small bulb of applied force (indicative of pressure reduction). Flake scars are absent on the ventral surface of these blades, though eraillure flakes are sometimes present on the bulb . The dorsal surface, on the other hand, exhibits scar ridges running parallel to the long axis of the blade. These facets are created by the previous removal of blades from the core. The proximal end contains the blade's striking platform and its bulb of applied force, while the distal end will consist of a snap break, a feather termination, or a stepped termination. 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「Prismatic blade」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.