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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sickle-gloss ： ウィキペディア英語版 Sickle-gloss Sickle-gloss, or sickle sheen, is a silica residue found on blades suggesting that they have been used to cut the silica-rich stems of cereals and forming an indirect proof for incipient agriculture. The gloss occurs from the abrasive action of silica in both wild and cultivated stems of cereal grasses, meaning the occurrence of reaping tools with sickle gloss doesn't necessarily imply agriculture. The first documented appearance of sickle-gloss is found on flint knapped blades in the Natufian culture (12,500 to 9500 BC) in the Middle East, primarily in Israel. == How Sickle-Gloss Forms == Sickle-gloss has been recognized as a characteristic of reaping grasses since the 1930s, at least. There is a general consensus that sickle-gloss occurs after the reaping of grasses and it may form in as little as a few hours of work. However, it may require more time to accumulate enough sickle-gloss for archaeological preservation. It is also speculated that the gloss may accumulate from cutting canes or reeds, woodworking or perhaps even hoeing or digging. It may be possible to distinguish between different types of glosses on a macro or microscopic level. 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「Sickle-gloss」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.