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How are index fossils used to determine the absolute age of sedimentary rock

How are index fossils used to determine the absolute age of sedimentary rock
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How are index fossils used to determine the absolute age of sedimentary rock

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User Graham Dumpleton
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They help determine the relative rock layers. Index fossils are from species that only existed for a short time. They are found in rock layers
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User CLaRGe
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