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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 Hummocky cross-stratification ： ウィキペディア英語版 Hummocky cross-stratification Hummocky cross-stratification is a type of sedimentary structure found in sandstones. It is a form of cross-bedding usually formed by the action of large storms, such as hurricanes. It takes the form of a series of "smile"-like shapes, crosscutting each other. It is only formed at a depth of water below fair-weather wave base and above storm-weather wave base. They are not related to "hummocks" except in shape. == History == The name was introduced by Harms et al. in 1975. Before this time, these structures were recognized under many different names. When hummocky cross-stratification was founded, it was originally given the name “truncated wave-ripple laminae,” by Campbell (1966, 1971).〔Surlyk, F., and N. Noenygaard. "Hummocky Cross-stratification from the Lower Jurassic Hasle Formation of Bornholm, Denmark." ''Sedimentary Geology'' 46.3-4 (1986): 259-73. Print.〕 The main features were listed by Bourgeois (1980), Harms et al. (1982), and Walker (1983),〔 in order to identify the structure. Dott and Bourgeois launched an idealized hummocky stratification sequence. From bottom to top, these include: first-order scoured base (± sole marks); characteristic hummocky zone with several second-order truncation surfaces separating individual undulating lamina sets; a zone of flat laminae; a zone with well-oriented ripple cross-laminae and symmetrical ripple forms; all overlain by a more or less burrowed mudstone or siltstone.〔Dott, R. H., and Joanne Bourgeois. "Hummocky Stratification: Significance of Its Variable Bedding Sequences." Geological Society of America Bulletin 93.8 (1982): 663-80. Print.〕 Walker (1983) wanted to create a second sequence, but it was decided that this sequence offers the best basis for studying hummocky cross-stratification for the future.〔 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「Hummocky cross-stratification」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.