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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 Serpent Mound crater ： ウィキペディア英語版 Serpent Mound crater Serpent Mound crater, also known as the Serpent Mound Disturbance, is an eroded meteorite impact crater in Ohio, United States. It lies largely in Adams County, with the northern part mostly in Highland County, except for a small northeast part in Pike County.〔''"Subsurface Geology of the Serpent Mound Disturbance of Adams, Highland, and Pike Counties, Ohio."'' Ohio Department of Natural Resources, Division of Geological Survey. (PDF ) (accessed 10 April 2007)〕 It is classified as a complex crater because it features a central uplift, a transition zone, and a ring graben (a ring-shaped trough in the outer part of the crater). Although eroded, the original rim diameter has been estimated at and the age is estimated to be less than 320 million years (Mississippian or younger).〔http://www.passc.net/EarthImpactDatabase/serpentmound.html〕 However, K.A. Milam argued that the maximum rim diameter might rather have been as much as . The crater is named after the Serpent Mound, an effigy mound, located on a plateau in Brush Creek Valley within the crater. European-American explorers had already noted the unusual terrain in the 19th century, and it is often speculated that the odd geological features inspired Native Americans to construct the mound at that location. ==References== 〔 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「Serpent Mound 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.