Egg with embryo inside from the Cretaceous found in China

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A team of researchers affiliated with several institutions in China and Canada has identified a turtle egg fossil from the Cretaceous period that contains an embryo. 

Finding the eggs of dinosaurs or turtles from the Cretaceous period is extremely rare—their fragile nature makes it difficult for them to survive to the present, even in prime conditions. Finding a fossilized embryo still inside such an egg is even more rare.

But that is just what the team in China discovered when they visited a farmer in China's Henan Province. He had inadvertently dug up what he had described as several strange-looking rocks. One of those rocks turned out to be a turtle egg that the team dated to a time during the Cretaceous period, somewhere between 66 and 145 million years ago.

In studying the egg using a variety of techniques, including micro-computed tomography, the researchers were able to see that the egg was from a turtle that had belonged to a group known as nanhsiungchelyids—a land-dwelling species wiped out by the same impact that wiped out the dinosaurs. 

S - https://phys.org/news/2021-08-thick-shelled-turtle-egg-embryo-cretaceous.html

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This is how the species is thought to have looked like:

 

And this is a 3D printed model of the egg: