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Brown Mountain is a small cinder cone on top of a shield volcano located in Cascade Volcanic Arc in Klamath and Jackson counties, Oregon.〔 Most of the mountain, including its peak, is in western Klamath County, but its western flanks trail off into eastern Jackson County. It is above sea level, but is overshadowed by nearby Mount McLoughlin.〔 〕 ==Geology== Brown Mountain appears to be relatively young at first as its summit is unweathered and devoid of trees, however glacial valleys and a cirque near the summit prove that the mountain is actually twelve thousand to sixty thousand years old.〔 Around two thousand years ago,〔 〕 a large lava flow consisting primarily of basaltic andesite covered of the north and western slopes with Aa-type lava over thick.〔〔 〕〔 〕 Over its lifetime, the mountain has erupted over of lava.〔 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「Brown Mountain (Klamath County, Oregon)」の詳細全文を読む スポンサード リンク
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