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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 Bald Hill Claystone ： ウィキペディア英語版 Bald Hill Claystone Bald Hill Claystone is a sedimentary rock found in the Sydney Basin in eastern Australia. It is part of the Clifton sub-group of the Narrabeen Group of sedimentary rocks. It was formed by weathering of the Gerringong Volcanics in the early Triassic.〔(【引用サイトリンク】title=Sydney Basin – Geological Overview )〕 Named after Bald Hill, in the northern Illawarra, where it is 15 metres thick. The claystone is easily noticed at Long Reef, where it is 18 metres thick. == Mineralogy == The Bald Hill Claystone is a redbed containing laterite. Primarily a red shale or fine to medium grained sandstone. Kaolinite is found in proportions of 50% to over 75%. Iron rich haematite is also present. Felspar and quartz may be present. This mineralogy indicates that Bald Hill Claystone is unlikely to swell. Typically this rock type is a chocolate brown to red brown colour, with bands of silty grey, or sandy greenish grey. 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「Bald Hill Claystone」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.