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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 Geological history of Point Lobos ： ウィキペディア英語版 Geological history of Point Lobos The geological history of Point Lobos, California, encompasses the last 80 million years. The oldest rocks exposed here were formed during the Cretaceous Period, when the dinosaurs still roamed the earth and pterodactyls dominated the sky. The area forms part of the Salinian Block a sliver of continental crust caught up in the transform boundary between the Pacific and North American Plates. Point Lobos is the common name for the area including Point Lobos State Reserve and two adjoining marine protected areas: Point Lobos State Marine Reserve (SMR) and Point Lobos State Marine Conservation Area. == Santa Lucia Granodiorite== During the Cretaceous period the west coast of North America was the site of an active chain of volcanoes. Active subduction created magma chambers that fed the volcanoes. This magma cooled slowly at depths of 10–20 km below the earth's surface to form a granitic intrusion known as the Santa Lucia Granodiorite. Granodiorite is made of quartz, orthoclase, plagioclase, amphibole, and biotite mica. Radiometric data indicate and age of 79.5 million years for the granodiorite. Over the next 30 million years the Santa Lucia Granodiorite rose to the earth's surface and was eroded. The granodiorite provides the basement rock for the younger sedimentary deposits of Point Lobos. 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「Geological history of Point Lobos」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.