How do index fossils help scientists establish how old rocks and other fossils are? In your
answer, include fossils in the same layer of rock, in a lower layer of rock, and in a higher
layer of rock compared to an index fossil.

Index fossils are fossils of organisms that lived during only one short period of time. A layer rock with an index fossil in it is close in age to another layer of rock with the same type of index fossil in it. Even though rock layers are of different regions, index fossils indicates that the layers are close in age.

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How do index fossils help scientists establish how old rocks and other fossils are? In your answer, include fossils in the same layer of rock, in a lower layer of rock, and in a higher layer of rock compared to an index fossil.

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How do index fossils help scientists establish how old rocks and other fossils are? In your
answer, include fossils in the same layer of rock, in a lower layer of rock, and in a higher
layer of rock compared to an index fossil.