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Favoriting this resource allows you to save it in the “My Resources” tab of your account.There, you can easily access this resource later when you’re ready to customize it or assign it to your students.There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.Misleading results can occur if the index fossils are incorrectly dated.Stratigraphy and biostratigraphy can in general provide only relative dating (A was before B), which is often sufficient for studying evolution.Paleontology seeks to map out how life evolved across geologic time.A substantial hurdle is the difficulty of working out fossil ages.

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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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