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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 Boars Tusk ： ウィキペディア英語版 Boars Tusk Boars Tusk is an isolated butte within the Rock Springs Uplift in the Green River Basin of southwestern Wyoming. The butte has a peak elevation of and rises some above the surrounding Killpecker Creek plain and lies north of Rock Springs. The north end of White Mountain lies to the west.〔''Rock Springs, Wyoming,'' 30x60 Minute Topographic Quadrangle, USGS, 1981〕〔''Boars Tusk, Wyoming,'' 15 Minute Topographic Quadrangle, USGS, 1958〕 Boars Tusk is an isolated remnant of a long extinct volcano associated with the Leucite Hills to the east. Heavily eroded, all that remains of the volcano is part of the erosion resistant volcanic neck which is composed of the uncommon volcanic rock lamproite.〔(Mindat locality )〕 Rock samples from Boars Tusk provided an age of 2.5 MA.〔R. A. Lange et al., ''40Ar/39Ar chronology of the Leucite Hills, Wyoming: eruption rates, erosion rates, and an evolving temperature structure of the underlying mantle,'' Earth and Planetary Science Letters, 174, (2000), p. 334 (PDF )〕 ==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「Boars Tusk」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.