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

Shinji Isaji, Ai Matsushita, Ren Hirayama

研究成果: Article

14 引用 (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.

元の言語English
ページ(範囲)29-36
ページ数8
ジャーナルPaleontological Research
10
発行部数1
DOI
出版物ステータスPublished - 2006 4 30

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eggshell
egg shell
turtle
turtles
Japan
egg
Cretaceous
swamps
swamp
nucleation
lacustrine deposit
fossils
fossil
shell
lakes

ASJC Scopus subject areas

  • Palaeontology
  • Ecology, Evolution, Behavior and Systematics

これを引用

Chelonian eggshells from the Lower Cretaceous Kuwajima Formation of the Tetori Group, Central Japan. / Isaji, Shinji; Matsushita, Ai; Hirayama, Ren.

:: Paleontological Research, 巻 10, 番号 1, 30.04.2006, p. 29-36.

研究成果: Article

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