Chelonian eggshells from the Lower Cretaceous Kuwajima Formation of the Tetori Group, Central Japan

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概要

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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.

• 日本古生物学会の論文
• 2006-04-30

著者

• Hirayama Ren

  School Of International Liberal Studies Waseda University

• ISAJI SHINJI

  Natural History Museum and Institute

• MATSUSHITA AI

  Faculty of Science, Toho University

• Matsushita Ai

  Faculty Of Science Toho University

関連論文

• Ocadia nipponica, a new species of aquatic turtle (Testudines: Testudinoidea: Geoemydidae) from the Middle Pleistocene of Chiba Prefecture, central Japan
• Chelonian eggshells from the Lower Cretaceous Kuwajima Formation of the Tetori Group, Central Japan
• A theropod dinosaur (Saurischia: Maniraptora) from the Upper Cretaceous Yezo Group of Hokkaido, Northern Japan
• X-ray computed tomography examination of a fossil beaver tooth from the lower Miocene Koura Formation of western Japan
• Preliminary results of a taphonomic study of a vertebrate accumulation from the Tetori Group (Lower Cretaceous) of Japan
• Terrestrial and freshwater pulmonate gastropods from the Early Cretaceous Kuwajima Formation, Tetori Group, Japan

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