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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 Ames crater ： ウィキペディア英語版 Ames crater Ames crater is a meteorite crater (astrobleme) in Major County, Oklahoma, United States. It is about 3 km north of Ames, Oklahoma〔(Ahern, Judson L. "Gravity and Magnetic Investigation of the Ames Structure, North Central Oklahoma." ) Retrieved December 17, 2013.〕 and southwest of Enid, Oklahoma.〔( American Oil & Gas Historical Society. "Ames Astrobleme Museum." ) Retrieved May 15, 2014.〕 Buried under a thick layer of sediment, it was not discovered until 1991. Subsequent drilling within the crater, found a large amount of oil and gas. It is the largest of six oil-producing meteor craters in the United States. ==Crater description== Ames Crater is 10 miles (16 km) in diameter and the age is estimated to be 470 ± 30 million years (Ordovician). The crater is not exposed at the surface. It may be one of several Middle Ordovician meteors that fell roughly simultaneously 469 million years ago, part of a proposed Ordovician meteor event, including the Decorah crater in Iowa, the Slate Islands crater in Lake Superior, and the Rock Elm crater in Wisconsin. The crater's origin has been postulated as meteorite impact, volcanic activity, dissolution collapse and other causes. Geomorphology, rock textures, mineralogies and stratigraphic arguments have been used to support impact origin.〔( Ahern, Judson L. "The Potential of Potential Fields for Detecting Buried Impact Structures: Earth and Mars." ) Retrieved May 1, 2014.〕 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「Ames crater」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.