66-Million-Year-Old Fully Articulated Dinosaur Embryo is Discovered Inside of a Fossilized Egg

Luke Cage

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They don't know it's exactly 66 million it's just an estimate. There are several ways to date something, not perfect.

For things that were once alive like plants and animals radiocarbon dating is one example:

Yeah, i remember in school they mentioned they could date stuff based on the layer of the crust its discovered in as well.
It's called relative dating
Relative_dating_of_fossils.png

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