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theFossils are really important for working out the relative ages of sedimentary rocks.  Geologists have studied the order in which fossils appeared and disappeared through time and rocks. This study is called biostratigraphy. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart. the  layer its on  lower the ground  in the grand cayon the older the fossil it is

The property of fossils that allows scientists to determine the relative rock ages is known as index fossils.

Index fossils are useful due to the fact that they tell the relative ages of rock layers where they occur.

Index fossils are the plants or animals that are preserved in the rock record of the Earth. It should be noted that index fossils show the characteristics of a certain span of geological time. Therefore, it can be used by scientists to determine the relative rock ages.

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