Density and Relative Abundance of Microspheric and Megalospheric Forms of Nummulites as Sedimentologic and Taphonomic Indicators
書誌事項
- タイトル別名
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- 985 Density and relative abundance of microspheric and megalospheric forms of Nummulites as sedimentologic and taphonomic indicators
- Density and Relative Abundance of Micro
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The density and relative abundance of smaller (megalospheric) and larger (microspheric) forms of Nummulites provide excellent indicators of sedimentary condensation, dilution and size-sorting during the formation of fossil assemblages, using an inferred 10 : 1 original ratio of the two forms. Various degrees of current sorting were recognized in the sandy facies of Nankinhama of Hahajima, Ogasawara Islands; storm condensation in low-angle, cross-bedded sandstone, winnowing in sandstone beds with strongly imbricated Nummulites tests, and highly diluted occurrence in debris flow deposits. A poorly sorted, pale green, bedded sandstone is interpreted to represent the least disturbed and perhaps indigenous preservation of Nummulites. In this sandstone, the ratio of the two forms is roughly 10 : 1, as for other published examples. No significant modification of density and relative abundance between the two forms occurs in an apparently allochthonous occurrence of Nummulites in conglomeratic debris flows. Therefore, preservation of the original ratio of the two forms of Nummulites does not necessarily exclude transportation.
収録刊行物
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- Transactions and proceedings of the Paleontological Society of Japan. New series
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Transactions and proceedings of the Paleontological Society of Japan. New series 1995 (177), 59-64, 1995
日本古生物学会
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詳細情報 詳細情報について
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- CRID
- 1390282680410539008
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- NII論文ID
- 110002703389
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- NII書誌ID
- AA00867896
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- ISSN
- 21860963
- 00310204
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- NDL書誌ID
- 3610509
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可