The dinosaur eggs, mainly classified as Placoolithus tumiaolingensis , are about 85 million years old, meaning they were laid around a time when the global climate was changing.

Paleontologists have directly dated fossilized dinosaur eggs for the first time ever using carbonate uranium-lead (U-Pb) dating.

Typically, in order to estimate the age of a dinosaur egg, researchers must use the surrounding rock layers or volcanic ash to approximate the fossil’s age. However, this method risks a much rougher estimate, because depending on the environment and the region, those rock layers or volcanic ash may not necessarily be the same age as the egg.

Now, for the first time, experts have been able to directly date the eggs themselves, with a method that had already been successfully used on o

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