There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.
Strata are differentiated from each other by their different colors or compositions and are exposed in cliffs, quarries, and river banks.
These rocks normally form relatively horizontal, parallel layers, with younger layers forming on top.
This is difficult for some time periods, however, because of the barriers involved in matching rocks of the same age across continents.
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