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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Abstract
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.
Journal
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- Paleontological Research
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Paleontological Research 10 (1), 29-36, 2006
PALAEONTOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204086585216
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- NII Article ID
- 130004456665
- 110004729547
- 210000132237
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- NII Book ID
- AA11137385
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- ISSN
- 18800068
- 13428144
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- NDL BIB ID
- 7926839
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed