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Which characteristics of a fossil would make it useful as an index fossil in determining the relative age of widely separated rock layers?

Which characteristics of a fossil would make it useful as an index fossil in determining the relative age of widely separated rock layers?
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Which characteristics of a fossil would make it useful as an index fossil in determining the relative age of widely separated rock layers?

User Realhu
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a narrow time range and a wide geographic range
User Recek
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