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Why are index fossils useful for determining the age of other fossils or rock layers?

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Answer:

Step-by-step explanation:

Certain fossils, such as ammonites, trilobites and graptolites, are known as index fossils. Because they were so abundant and widespread during a short period of geological time, their presence helps date rocks from that period.

Index fossils are fossils that are widespread but only existed for a short period of time. Index fossils help scientists to find the relative age of a rock layer and match it up with other rock layers. HOPED THIS HELPED, FEEL FREE TO ASK ANY QUESTIONS>

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