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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 Burro Mesa Archeological District ： ウィキペディア英語版 Burro Mesa Archeological District The Burro Mesa Archeological District encompasses a quarry in Big Bend National Park used by native Americans as a source of chert for chipped-stone tools. The quarry was used intermittently beginning in the paleoindian period starting about 12,000 to 13,000 years ago. The chert is found in a variety of colors and rests on top of tuff beds which themselves contain veins of kaolinite that was suitable for making claystone ornaments and beads. The quarry area is carpeted with lithic debris from the initial knapping process by which chert was rough-shaped into material of suitable size and shape for later refinement at more convenient locations.〔(【引用サイトリンク】url=http://www.texasbeyondhistory.net/trans-p/nature/images/Burro-Mesa.html )〕 The quarry was placed on the National Register of Historic Places on September 11, 1985.〔 ==References== 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「Burro Mesa Archeological District」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.