Chelonian eggshells from the Lower Cretaceous Kuwajima Formation of the Tetori Group, Central Japan
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- ISAJI Shinji
- Natural History Museum and Institute, Chiba
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- MATSUSHITA Ai
- Faculty of Science, Toho University, Funabashi-shi
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- HIRAYAMA Ren
- School of International Liberal Studies, Waseda University, Tokyo
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Chelonian eggshell fossils from the Lower Cretaceous Kuwajima Formation of the Tetori Group are described. The eggs were originally spherical or ellipsoidal in shape. The eggshells consist of a single layer of spherulitic shell units composed of needle-like crystallites originating from a nucleation center. This corresponds to modern rigid-shelled chelonian eggs. The eggshell fragments are commonly found buried together and are known from deposits of subaerial environments, such as vegetated swamps. In contrast, the vast majority of turtle remains are known primarily from nearby shallow lake deposits, indicating that they are aquatic; no terrestrial turtles are known from this formation. These taphonomic settings suggest that the eggs were laid on land by lacustrine turtles in a process still apparent today.
収録刊行物
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- Paleontological Research
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Paleontological Research 10 (1), 29-36, 2006
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
- 1390001204086585216
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- NII論文ID
- 130004456665
- 110004729547
- 210000132237
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- NII書誌ID
- AA11137385
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- ISSN
- 18800068
- 13428144
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- NDL書誌ID
- 7926839
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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
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可