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Intermontane Islands : ウィキペディア英語版 | Intermontane Islands right The Intermontane Islands were a giant chain of active volcanic islands somewhere in the Pacific Ocean during the Triassic time beginning around 245 million years ago. They were 600 to long and rode atop a microplate known as the Intermontane Plate. Over early Jurassic time the Intermontane Islands and the Pacific Northwest drew closer together as the continent moved west and the Intermontane Plate subducted. About 180 million years ago in the Mid-Jurassic time the last of the Intermontane Plate subducted and the Intermontane Islands collided with the Pacific Northwest, forming parts of British Columbia, Canada. The Intermontane Islands were too big to sink beneath the continent, and welded onto the continent, forming the Intermontane Belt. Geologists call the ocean that existed between the Intermontane Islands and North America the Slide Mountain Ocean. ==See also==
*Island arc *Insular Islands *Intermontane Plate *Intermontane Belt
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「Intermontane Islands」の詳細全文を読む
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