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- 奈良 正和
- 京都大学理学部地質学鉱物学教室
書誌事項
- タイトル別名
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- What is the producer of "trace fossil of Excirolana chiltoni"? : Tracemaking mechanism of Macaronichnus segregatis
- ヒメスナホリムシ ノ セイコン カセキ ノ ケイセイシャ ワ ナニカ セイコン
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抄録
Macaronichnus segregatis, which is recognizable as white colored spots having 2 to 5mm in diameter, occurs in the Middle to Late Pleistocene foreshore deposits distributed in the Kanto plain, central Japan. It is a long, sinuous, unbranched burrow without apparent wall or burrow lining. This fossil has been regarded in Japan as trace of locomotion of a small isopod, Excirolana chiltoni. The microscopic observation reveals that the particles in the burrow filling are composed of sand grade colorless minerals such as quartz and feldspar, rich in poorly rounded particles as compared to the surrounding sediments. A deformed lamination, which may have been synchronously formed with the burrow, is discernible in the laminated sand of the burrow-bearing horizon. The tracemaker seems to penetrate the sediments with peristaltic movement, called intrusion. According to my field observation and experimental study E. chiltoni never make a trace like M. segregatis. The isopod moves through sediments by backfilling but not by intrusion. Taking all things into consideration, the tracemaker is not E. chiltoni, but a probable vermiform animal, and the present trace fossil is probably of fecal origin. The tracemaker may have selectively ingested particles in relation to their shape and specific gravity, though the exact mechanism of particle selection is yet unknown.
収録刊行物
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- 化石
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化石 56 (0), 9-20, 1994
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
- 1390282679412482176
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- NII論文ID
- 110002703584
- 10004022906
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- NII書誌ID
- AN00041606
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- ISSN
- 24242632
- 00229202
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- NDL書誌ID
- 3889478
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可