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Needle Rock Natural Area : ウィキペディア英語版 | Needle Rock Natural Area
Needle Rock is an intrusive of rhyodacite volcanic plug located in the Needle Rock Natural Area, east-northeast (bearing 68°) of the Town of Crawford in Delta County, Colorado, United States. It stands tall above the floor of the Smith Fork of the Gunnison River valley. It originated as the throat of a large volcano about 28 million years ago in the Miocene geological epoch, when molten rock intruded between existing sedimentary rocks. The plug may represent the eroded conduit of a laccolith.〔 ==See also==
*List of Colorado mountain ranges *List of Colorado mountain summits * *List of Colorado fourteeners * *List of Colorado 4000 meter prominent summits * *List of the most prominent summits of Colorado *List of Colorado county high points
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「Needle Rock Natural Area」の詳細全文を読む
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