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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 Latah Formation ： ウィキペディア英語版 Latah Formation The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho. The lake beds are interbedded with igneous rock of the Columbia River Basalt Group. The formation was originally named from a site in Spokane, Washington by Dr. Kirk Bryan in 1923. Numerous fossil plants and insects have been recovered from the formation and described.〔 & 1929 "The Latah Formation" ''The Journal of Geology'' 37(5):483-504〕 When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be coeval.〔 1969 "Fossil insects of the Latah Formation (Miocene) of Eastern Washington and Northern Idaho" ''Northwest Science''〕 Potassium-argon dating of the formation returned an age range of 21.3 to 12.1 million years old, indicating an Early to Middle Miocene age range. ==References== 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「Latah Formation」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.