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

Shinji Isaji*, Ai Matsushita, Ren Hirayama

*この研究の対応する著者

研究成果: Article査読

17 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)29-36
ページ数8
ジャーナルPaleontological Research
10
1
DOI
出版ステータスPublished - 2006 4月 30

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 古生物学

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