Dating rocks with fossils
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Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.
They help us to understand evolution and life in general; they provide critical information for understanding depositional environments and changes in Earth’s climate; and, of course, they can be used to date rocks.
The major groups of organisms that we are familiar with evolved between the late Proterozoic and the Cambrian (~600 Ma to ~520 Ma).
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