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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 Mole Hill (Virginia) ： ウィキペディア英語版 Mole Hill (Virginia) Mole Hill is a rounded hill composed of basalt, a volcanic rock, formed during the Eocene epoch of the Paleogene period. It is the eroded remnant of what was an active volcano approximately 47 million years ago, making it one of the youngest volcanos on the east coast of North America. It is located west of Harrisonburg, VA, in Rockingham County. ==Description== Mole Hill is an isolated, rounded, tree-covered hill in an otherwise relatively flat valley, surrounded by farmland. The basalt itself, outcropping at the crest of the hill, is "dark greenish gray to grayish black, medium grained, and moderately porphyritic. It is an olivine-spinel basalt with abundant large pale green pyroxene and minor yellow-brown olivine phenocrysts.".〔Gathright, T. M., and Frischmann, P. S., 1986, Geology of the Harrisonburg and Bridgewater Quadrangles, Virginia, VA Division of Mineral Resources Publication 60〕 The basalt intrudes through the Ordovician Beekmantown Group of carbonate rocks. 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「Mole Hill (Virginia)」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.