168k views
3 votes
Why are index fossils used to date other fossils in an area of rock

1 Answer

1 vote
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found inrock layers. Trilobites and Graptolites are index fossils.
User Pedrostanaka
by
5.9k points