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In fact, Paul already knows that coelophysis lived around 200 million years ago, while iguanodon lived around 150 million years ago.

And, he also found a coelophysis fossil in the yellow layer. Of course, the coelophysis, which means that coelophysis came before iguanodon.Scientists know that the layers they see in sedimentary rock were built up in a certain order, from bottom to top.When they find a section of rock that has a lot of different strata, they can assume that the bottom-most layer is the oldest and the top-most layer is the youngest.Recently, he appeared on the evening news to talk about a new dinosaur he just discovered. Paul says he can tell from the fossils that superus awesomus lived on Earth about 175 million years ago.Paul is super awesome, so I'm going to take him at his word.

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