Nature First fossil dinosaur eggs found in Kyushu

The species of the dinosaurs are unknown. Museum officials said one of the fossils is 27 millimetres long, 10 mm wide and 1.7 mm thick, and the other is 25 mm long, 15 mm wide and 2 mm thick. If spherical, the eggs would have been about 5 to 7 centimetres in diameter and the size of a baseball. [...] The stratum contains many fossils of dinosaurs and other reptiles, including turtle eggs. The fossil excavated in 2003 was stored as a turtle fossil because of its plate-like shape and thickness. But in the autumn of last year, researchers examined the cross-sectional structure in detail with a microscope. They found the fossil closely resembled the Coralloidoolithus egg genus reported from the Cretaceous Period stratum in China. A recent study also determined the other fossil was also an eggshell.

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