A 190-million-year-old dinosaur bonebed near the city of
Lufeng, in Yunnan, China has revealed for the first time how dinosaur embryos
grew and developed in their eggs.
The great age of the embryos is unusual because almost all
known dinosaur embryos are from the Cretaceous Period. The Cretaceous ended
some 125 million years after the bones at the Lufeng site were buried and
fossilized.