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How paleontologists estimate geologic time through radiometric dating

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According to the law of superposition, as long as an area remains undeformed by outside forces, the deeper you go down through the layers of rock, the older they are.So, if you know the ages of the layers in the parent and wall rocks, you can calculate the age of the layers in your subsided area or xenolith by matching them.One way to find the age of a xenolith or subsidence area surrounded by volcanic debris is to correlate its layers with the layers of wall or parent rocks.

The eras are broken down into periods, which represent smaller units of time.

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.

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Sedimentary rocks form from soil and silt carried and deposited by moving water.

Over time, the accumulated deposits compress and harden.