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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 Rock Elm Disturbance ： ウィキペディア英語版 Rock Elm Disturbance The Rock Elm Disturbance is an impact crater in Wisconsin, United States, roughly 40 kilometers southwest of Menomonie. The disturbance is named for Rock Elm, Wisconsin, a nearby community. ==Features== The meteorite is estimated to have been in diameter with a mass of and impact velocity of . The crater is in diameter, and fossils found in the rock filling the crater suggest it dates to the middle Ordovician Period, about 455 to 430 million years ago.〔 〕 It may be one of several Middle Ordovician meteors that fell roughly simultaneously 469 million years ago, part of a proposed Ordovician meteor event that includes the Decorah crater in Iowa, the Slate Islands crater in Lake Superior, and the Ames crater in Oklahoma. 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「Rock Elm Disturbance」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.