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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 Southern Oregon Coast Range ： ウィキペディア英語版 Southern Oregon Coast Range The Southern Oregon Coast Range is the southernmost section of the Oregon Coast Range, in the Pacific Coast Ranges, located in the southwest portion of the state of Oregon, United States, roughly between the Umpqua River and the middle fork of the Coquille River, beyond which are the Klamath Mountains. To the east is the Umpqua Valley and to the west the Pacific Ocean. This approximately -long mountain range contains mountains as high as for Bone Mountain. The mountains are known locally in the Roseburg area as the Callahan Mountains, or simply as The Callahans. ==Geology== As with the Oregon Coast Range as a whole, the Southern Oregon Coast Range likely began as an ocean island chain that collided with the continental tectonic plate of North America more than 60 million years ago.〔Orr, Elizabeth and William Orr, and Ewart Baldwin. Geology of Oregon. Kendall/Hunt Publishing, 1992, 4th edition.〕 In the Southern Range the 64‑million-year-old Roseburg volcanics that formed this section are the oldest portions of the entire range.〔 The range is part of a forearc basin that has slowly rotated about 51 degrees since the Eocene period.〔 Much of the mountain structures are pillow basalt formations created during the volcanic period and then uplifted with the collision into the continental plate.〔 Other geologic features are mainly the result of erosion and weather forces carving steam beds and valleys out of the rock formations.〔 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「Southern Oregon Coast Range」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.