Answer:
According to the principle of faunal succession, the sedimentary rocks are comprised of fossilized plants and animals that are present distinctly in a vertical sequence of rocks, and those fossils that are found at the bottom of the sequence depicts older fossils and describes older geological events.
On the other hand, those fossils that are on the apex are the younger one and signifies a much recent event.
These fossils are very important in the relative dating method of rocks. After applying the dating methods, these fossils provide a distinctive age that enables the geologists to determine and distinguish the events that have taken place in the past and in the recent.
Thus, the principle of faunal succession is very helpful in the relative dating of rocks.