Dendroolithus sp. (dinosaur egg) (Majiacun Formation, Upper Cretaceous; Xixia Basin, Henan, China) : 無料・フリー素材/写真
Dendroolithus sp. (dinosaur egg) (Majiacun Formation, Upper Cretaceous; Xixia Basin, Henan, China) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Dendroolithus sp. - fossil dinosaur egg from the Cretaceous of China.Biogenic products are objects produced by ancient organisms. Many paleontologists refer to these as trace fossils, but they really aren't. Examples of fossil biogenic products include eggs, amber (fossilized tree sap), coprolites (fossilized feces), and spider silk. Eggs were originally small, living cells, but the hard eggshells are mineralized - the material was never alive, and thus are biogenic products.The most impressive fossil eggs are those of dinosaurs. Dinosaur nests having eggs in their original position are known from several localities. Sometimes, x-ray analysis or cat-scan analysis shows the presence of dinosaur embryos inside intact eggs. An embryo would be a body fossil, but the surrounding eggshell material is a biogenic product.Fossil eggs can be given scientific names. In this case, the specimen belong to the oogenus Dendroolithus. The specific identity of the eggmaker is uncertain.Classification: Animalia, Chordata, Vertebrata, Reptilia, DinosauriaStratigraphy: Majiacun Formation, Santonian Stage, middle Upper CretaceousLocality: unrecorded / undisclosed site in the Xixia Basin, Henan Province, China-----------------------------------------Info. at:en.wikipedia.org/wiki/Dendroolithus |
| 撮影日 | 2023-04-02 09:02:32 |
| 撮影者 | James St. John |
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