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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 Trimble Knob ： ウィキペディア英語版 Trimble Knob Trimble Knob, located southwest of Monterey in Highland County, Virginia, is a conical hill composed of basalt, a volcanic rock, of Eocene (early Tertiary) age. It is the eroded remnant of what was an active volcano or diatreme that last erupted approximately 35 million years ago, making it one of the youngest volcanos on the east coast of North America. ==Description== Trimble Knob is an isolated conical hill in an otherwise relatively flat valley, surrounded by farmland. U.S. Route 220 lies along the southeast flank of the hill. Trimble Knob is the most obvious of many igneous intrusions in the area. The central part of the hill is composed of basalt with a diameter of approximately . The basalt intrudes through the gently dipping Devonian Needmore Formation (fossiliferous shale and calcareous mudstone), and is near the axis of a syncline in the center of the valley.〔Rader, E.K. and Wilkes, G.P., 2001, Geologic map of the Virginia portion of the Staunton 30 X 60 minute quadrangle: Virginia Division of Mineral Resources, Publication 163, scale 1:100000.〕 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「Trimble Knob」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.