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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 Tumblagooda sandstone ： ウィキペディア英語版 Tumblagooda sandstone The Tumblagooda Sandstone is a geological formation deposited during the Silurian or Ordovician periods, between four to five hundred million years ago, and is now exposed on the west coast of Australia in river and coastal gorges near the tourist town of Kalbarri, straddling the boundary of the Carnarvon and Perth basins. Visible trackways are interpreted by some to be the earliest evidence of fully terrestrial animals.〔 ==Sedimentology== The Tumblagooda is over 1,400 m (4,500 ft) thick: the base is not exposed, but geophysical data (primarily magnetic) indicate the sandstone unconformably overlies a Proterozoic basement.〔 The formation is divided into four ''facies associations'' (FAs), numbered stratigraphically, that occur sequentially from bottom to top. These lithified sediments portray an environment dominated by high-energy braided streams flowing into the sea; some parts have been interpreted as reflecting deposition in ephemeral pools controlled by water table rise and fall,〔 but alternative interpretations favour deposition on tidal sand flats.〔 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「Tumblagooda sandstone」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.