Time periods of dating

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Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.This matching process is called correlation, which has been an important process in constructing geological timescales.

Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles: Fossils are important for working out the relative ages of sedimentary rocks.

Some of the most useful fossils for dating purposes are very small ones.

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