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Although most of the fossils that paleontologists study are several thousands to several billions of years old, there is no absolute minimum age for a biological structure to be a fossil.Paleontologists study fossils and attempt to use them to reconstruct the history of the Earth and the life on it.Formal education is not a prerequisite for becoming a paleontologist.What's needed is a keen analytical mind, curiosity and imagination tempered by scientific rigor, and lots of patience — to keep visiting sites, to keep good notes, and to familiarize yourself with what is known about the fossils and time period that you are studying.

Some paleontologists work for the petroleum industry, and use fossils to interpret sequences of sedimentary rocks.Paleontologists can provide historical data on past climates and apply it towards understanding future trends and their likely effects.If we understand the effects of climate change, for instance, on our world in the past, we can understand its probable effects in the future.Relative dating has been practiced for nearly 200 years, arising from the observation that different layers of sedimentary rock contain different fossils, and that this sequence can be recognized in other rocks at other localities, even those far away.This allows fossil-bearing rocks to be dated relatively; on the basis of its fossils a rock might be placed in, say, the Ordovician Period, which followed the Cambrian Period and was followed by the Silurian Period.

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