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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 Gatun structure ： ウィキペディア英語版 Gatun structure The Gatun structure is a possible eroded impact crater. It is named after the nearby Gatun Lake in Panama. It was first discovered in 1972 by geologist Bob Stewart and later studied by Livio L. Tornabene from the University of South Florida Department of Geology. The structure is estimated to have formed about 20 million years ago. This would place the event in the Miocene epoch. Despite the considerable erosion, it was possible to estimate the original diameter to have been 2.7 to 3 km, assuming the impact hypothesis is correct. Although diagnostic evidence of impact has not been reported, evidence favoring an impact origin include the recovery of possible impact glass at the site. Alternatively, the site may be of volcanic origin. ==References== * (PDF ) * (Abstract ) * 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「Gatun structure」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.