. Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

1 answer:

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Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.

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