Final answer:
Index fossils help determine rock layer ages accurately by recognizing specific organisms' fossils, aiding in correlating rock layers.
Explanation:
Index fossils are fossils of organisms that are easily recognizable, abundant, existed for a short period, and had a wide geographic distribution. They help determine the age of rock layers. For instance, Belemnites are index fossils from the Mesozoic era.
Fossils provide evidence of the history of life on Earth and past geological events. Index fossils are crucial for dating rock layers accurately through faunal succession.
Understanding index fossils is essential in correlating rock layers, as the presence of the same index fossils indicates similar ages of the rock layers.
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