Relative age dating also means paying attention to crosscutting relationships. Review law, not how old an age. Uses of fossils.
This follows due to the fact that sedimentary rock is produced from the gradual accumulation of sediment on the surface. These other scales work well for describing regional geology but can be difficult to correlate worldwide. The method of reading the order is called stratigraphy layers of rock are called strata. For example: Did rock layer A form before or after rock layer B? Fossils and relative dating Fossils are important for working out the relative ages of sedimentary rocks.