The longer the time span that a species existed, the more precisely an index fossil can be used to determine the age of a rock.

Name: The longer the time span that a species existed, the more precisely an index fossil can be used to determine the age of a rock.
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Index fossils are useful because they indicate the relative age of rocks based on the short time span in which the species existed, not a longer one. This allows for more precise correlation between different geographic areas.

The Longer the Time Span That a Species Existed, the More