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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 Schoonmaker Reef ： ウィキペディア英語版 Schoonmaker Reef Schoonmaker Reef, also known as Wauwatosa Reef, Schoonmaker Quarry, Raphu Station or Francey Reef is a 425 million year-old fossilized reef in Wauwatosa, Wisconsin.〔(JS Online: Tosa protects piece of geologic history )〕 It was discovered in 1844 by Increase A. Lapham and Fisk Day on the site of a quarry owned by the Schoonmaker Family. Geologist James Hall declared its significance in 1862.〔(SCHOONMAKER QUARRY )〕 It was the first ancient reef described in North America, and among the first described in the world.〔〔 and 〕 It is located North of W. State St., between N. 66th St. and N. 64th St. extended, in Wauwatosa.〔 It was declared a National Historic Landmark in 1997.〔 ==Geology== The Schoonmaker Reef formed approximately 425 million years ago during the Silurian period. It is largely dolomite, a sedimentary rock of calcium magnesium carbonate (CaMg(CO3)2) that is similar to limestone. The reef is stratigraphically consistent with the Racine Dolomite, a formation in Wisconsin and Illinois. The exposed portion of the reef is in the Menomonee River valley in Wauwatosa, Wisconsin. It exists as a massive, rock hill that stretches in a outcrop. It is exposed on the lower of a bluff; the upper portion of the bluff is formed by glacial sediments left in the last million years. The reef contains a variety of fossils from Silurian-era organisms, including trilobites.〔 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「Schoonmaker Reef」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.