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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 Geology of Colombia ： ウィキペディア英語版 Geology of Colombia Geology of Colombia refers to the geological composition of the Republic of Colombia that determines its geography. Most of the emerged territory of Colombia covers vast areas within the South American plate, whereas much submerged territory lies within the Caribbean plate and the Nazca plate. ==Geologic history== As in the rest of South America, a combination of external and internal tectonic, volcanic, and glacial forces over the eons formed Colombia's present-day geology.〔Bushnell, David and Rex A. Hudson. "Geology". In (''Colombia: A Country Study'' ) (Rex A. Hudson, ed.), pp. 70-71. Library of Congress Federal Research Division (2010). 〕 Island-like outcrops of metamorphic rocks in the eastern Llanos are visible remnants of Precambrian times. During the 289-million-year-long Paleozoic Era, which began 541 million years ago, the ocean invaded the area which is exposed in Colombia's Andean zone, as subterranean volcanic eruptions in the western part of the country spouted lava.〔 In the Triassic Period of the 186-million-year-long Mesozoic Era, which began 252 million years ago, the sea that occupied the Andean zone separated into two parts after the Cordillera Central rose.〔 Large layers of sedimentary rock were deposited during the Jurassic Period, which ended with great igneous activity.〔 During the Cretaceous Period, the sea to the east of the Cordillera Central extended to Putumayo region in the south, while subterranean volcanic activity continued to the west of the Cordillera Central.〔 During the Cenozoic Era, which began about 66 million years ago, the seas withdrew from most of Colombia's territory, and enormous granite masses formed along the Cordillera Occidental.〔 The three cordilleras began to take shape 12 million years ago.〔 The Cordillera Occidental and the Cordillera Central form the western and eastern sides of a massive crystalline arch, which extends from the Caribbean lowlands to the southern border of Ecuador.〔 The Cordillera Oriental, however, is composed of folded stratified rocks overlying a crystalline core.〔 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「Geology of Colombia」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.