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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 Saint Martin crater ： ウィキペディア英語版 Saint Martin crater Saint Martin is an impact crater in Manitoba, Canada. It is located in the northern part of the Rural Municipality of Grahamdale, northwest of Lake St. Martin. It is in diameter and its age was determined to be 227.8 ± 1.1 million years〔Schmieder M., Jourdan F., Tohver, E. and Cloutis, E. A. 2014. 40Ar/39Ar age of the Lake Saint Martin impact structure (Canada) - Unchaining the Late Triassic terrestrial impact craters. Earth Planet. Sci. Lett. (in press)〕 (Carnian stage of the Triassic) using the argon-argon dating technique. The crater is well preserved but poorly exposed at the surface as the whole region is covered by glacial drift. ==Hypothetical multiple impact event== (詳細はGeophysicist David Rowley of the University of Chicago, working with John Spray of the University of New Brunswick and Simon Kelley of the Open University, that the Saint Martin crater may have been part of a hypothetical multiple impact event which also formed the Manicouagan crater in northern Quebec, Rochechouart crater in France, Obolon' crater in Ukraine, and Red Wing crater in North Dakota.〔Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". ''Nature'', v. 392, pp. 171-173. (Abstract )〕 All of the craters had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these craters could be aligned like this due to chance are nearly zero. However, refined ages for the mentioned impact craters that differ by several million years contradict the multiple impact hypothesis. 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「Saint Martin 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.